Title of Invention	ARRANGEMENT AND METHOD FOR STORING MEASURED VALUES, IN PARTICULAR FOR MONITORING POWER TRANSMISSION SYSTEMS
Abstract	The invention relates to, inter alia, an arrangement comprising a control device (10), a storage device (100) controlled by a control device and at least two measuring device (PMU),PMU2,MPU3) that are connected to the control device and that receive measured values (VII, 111, V21, 12 1, V31, V32, 131) that are temporally correlated to respectively the same measurement instances and transmit them to the control device. According to the invention, the control device is ddesigned in such a manner that it stores the measured values of the two measuring device in the storage device in the form of a logical matrix (200) comprisin g lines (Zi) and columns (S1-S7). Each measuring device is associated with an individual column in which the measured values of the respective measuring device are stored. A new measured value of each measuring device is respectively input into the subsequent line of the respective column and the measured values of different measurement devices are stored in a correlated, line by line manner, the measured values of the different measuring devices relating to the same measurement instance are stored in the same line.

Title of Invention

ARRANGEMENT AND METHOD FOR STORING MEASURED VALUES, IN PARTICULAR FOR MONITORING POWER TRANSMISSION SYSTEMS

Abstract

The invention relates to, inter alia, an arrangement comprising a control device (10), a storage device (100) controlled by a control device and at least two measuring device (PMU),PMU2,MPU3) that are connected to the control device and that receive measured values (VII, 111, V21, 12 1, V31, V32, 131) that are temporally correlated to respectively the same measurement instances and transmit them to the control device. According to the invention, the control device is ddesigned in such a manner that it stores the measured values of the two measuring device in the storage device in the form of a logical matrix (200) comprisin g lines (Zi) and columns (S1-S7). Each measuring device is associated with an individual column in which the measured values of the respective measuring device are stored. A new measured value of each measuring device is respectively input into the subsequent line of the respective column and the measured values of different measurement devices are stored in a correlated, line by line manner, the measured values of the different measuring devices relating to the same measurement instance are stored in the same line.

Full Text	Description Arrangement and method for storing measured values, in particular for monitoring power transmission systems The invention relates to an arrangement comprising a control device, a memory device driven by the control device, and at least two measuring devices which are connected to the control device and, in a temporally correlated manner in each case at the same measurement instants, record measured values and transmit them to the control device. Arrangements of this type are used for example in the field of protection technology. They serve for example to detect and evaluate current and voltage in and on power transmission lines or in power transmission systems in order to detect impermissible or hazardous operating states and, if appropriate, to turn off installation parts as rapidly as possible, with the aim of keeping damage at a low level or avoiding it - as far as possible. Since, in order to establish a fault or a disturbance, in part not only the respective present measured values but also moreover temporally preceding, old measured values have to be taken into account, it is necessary to buffer-store the measured values at least for a certain time period. With regard to a subsequent analysis of cases of disturbance, it is usually desirable here for the storage time period to be as long as possible and to amount to a number of days, for example. However, the longer the storage time period, the larger the set of measured values becomes which has to be managed and the longer the access times become to individual measured values which are contained or - described illustratively - hidden within the set of measured values. Although standard database systems that are commercially available readily enable even extremely large volumes of data to be handled, the access times thereof are usually too long for a use for example in the field of protection technology for power transmission installations, as has been ascertained by the inventor, in the case of large sets of measured values. Accordingly, the invention is based on the object of specifying an arrangement which enables a long storage time period and nevertheless permits a minimal access time to stored measured values. Proceeding from an arrangement of the type specified in the introduction, this object is achieved according to the invention by means of the characterizing features of claim 1. Advantageous configurations of the invention are specified in dependent claims. Accordingly, the invention provides for the control device to be configured in such a way that it stores the measured values of the at least two measuring devices in the memory device in the form of a logical matrix having rows and columns, wherein it assigns to each measuring device an individual column in which the measured values of the respective measuring device are stored, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out in a manner correlated row by row by virtue of the fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. An essential advantage of the arrangement according to the invention can be seen in the fact that stored measured values can be accessed relatively rapidly. This can be attributed to the fact that the measured values are stored in a structured manner based on measurement instants. This is because if an evaluation module, whether it be a hardware evaluation device or a software evaluation application, wishes to have recourse to temporally preceding measured values, then it will generally not interrogate individual measured values from a wide variety of measurement instants, but rather measured value sets with measured values of different measuring devices from a specific time interval. Since, on account of the structured storage of the measured values that is provided according to the invention, all measured values which go back to the same measurement instant or to a specific measurement time interval are stored logically directly alongside and beneath one another in the memory device, for interrogating the measured values it is not necessary for the entire measured value data set available to be taken into account and searched; rather, it suffices for only the relevant memory section to be transmitted into a buffer memory, for example of the control device, and for only this relevant memory section to be used further. The access time to the requested or required measured values is significantly reduced as a result. In other words, the invention thus makes use of the insight that in practice, in particular in the field of protection and control technology, data records are not interrogated arbitrarily, but rather usually according to a predetermined pattern relating to the measurement instants. This forms the starting point of the invention in that the expected or highly probable interrogation pattern is already taken into account during the storage of the data, whereby the subsequent interrogation process is accelerated. Preferably, the memory area that is permissible or enabled for storing the measured values is limited in order to ensure that other devices such as evaluation modules and the like retain a sufficient memory area available within the memory device. Accordingly, in accordance with one preferred configuration of the arrangement, it is regarded as advantageous if the number of rows in the matrix is limited to a fixedly predetermined maximum number of rows, and if the control device, after writing to the last row of each column of the matrix, jumps back to the first row of the respective column and enters the respective next measured value of the respective measuring device into the first row of the respective column. Although the measuring devices are intended to and will always record their measured values at the same instants, such that these always relate to identical instants, the measured values will not be able to reach the control device simultaneously. This is because if one of the measuring devices is arranged significantly nearer to the control device than another measuring device, then the measured values of the locally nearer measuring device will generally arrive at the control device more rapidly than those of the remote measuring device. In order to have the effect, in a simple manner and thus advantageously, that all measured values arriving at the control device are nevertheless always stored at the correct matrix location or as a correct matrix element, in accordance with one preferred configuration of the arrangement it is provided that the control device is configured in such a way that it firstly accesses a phasor field, in which has been entered, for each measuring device and thus for each column of the matrix, an information item indicating indirectly or directly that row in which the respective next measured value is to be entered. Since the measured values are stored temporally row by row, storage of the absolute measurement instants or storage of the times of day of the measured value detection for each measured value individually is not necessary. Rather, in accordance with one preferred variant, it suffices if the control device is configured in such a way that it stores, only for a subset of the rows but at least for one row of the matrix (e.g. for the i-th row), in each case an absolute time indication indicating the measurement instant of the measured values stored in this row. By way of example, a single absolute time indication is held for each column of the matrix. The measurement instants tj of the remaining measured values in other rows of the matrix can then be determined in a simple manner by multiplying the difference between the row numbers by the temporal measured value detection interval and adding the absolute time indication ZA, for example in accordance with: where Zj denotes the j-th row of the matrix, Zi denotes the i-th row of the matrix for which the absolute time indication ZA is stored, T denotes the time period between two successive measurement instants which is predetermined for the measuring devices, and f denotes the measurement clock cycle which is predetermined for the measuring devices. Preferably, the control device is configured in such a way that it overwrites the stored absolute time indication in each case with a new absolute time indication as soon as a measured value with a more up-to-date measurement instant by comparison with the stored time indication is entered into the row. Particularly preferably, the following is entered into a phasor field in each case column-individually by an indirect or direct indication: the row, into which the respective next measured value of the respective column of the matrix or of the respective measuring device is to be entered, and also an absolute time indication indicating the measurement instant of the last entered measured value of the respective column. An indirect indication should be understood in this context to mean an indication from which the row and/or the time indication can be derived: it is thus possible to indicate for example the last row in which the last measured value was input, or instead the new row into which a new measured value is to be input. The invention additionally relates to a method for storing measured values of at least two measuring devices. In order, in the case of such a method, to have the effect that a long storage time period is made possible and a minimal access time to stored measured values is nevertheless achieved, the invention provides for the measured values of the measuring devices to be recorded in a temporally correlated manner and to be stored in a memory device in the form of a logical matrix having rows and columns, wherein an individual column is in each case assigned to each measuring device and the measured values of the respective measuring device are stored in said column, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out in a manner correlated row by row by virtue of the fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. With regard to the advantages of the method according to the invention and with regard to advantageous configurations of the method, reference should be made to the above explanations in connection with the arrangement according to the invention. A control device is additionally regarded as invention. With regard to such a control device, the invention provides for the control device to be configured in such a way that it stores the measured values of at least two measuring devices in a memory device in the form of a logical matrix having rows and columns, wherein it assigns to each measuring device an individual column in which the measured values of the respective measuring device are stored, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out. in a manner correlated row by row by virtue of the fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. With regard to the advantages of the control device according to the invention and with regard to advantageous configurations of the control device, reference should be made to the above explanations in connection with the arrangement according to the invention. The invention is explained in more detail below on the basis of exemplary embodiments; in this case, by way of example: figure 1 shows a first exemplary embodiment of an arrangement in which evaluation modules are formed by separate evaluation devices which are realized as hardware and which are connected to a control device - the method according to the invention is also explained by way of example on the basis of this exemplary embodiment -, figure 2 schematically shows a matrix structure in accordance with which the measured values of the arrangement in accordance with figure 1 are stored, and also an associated phasor field, figure 3 schematically shows the temporal profile of measured value storage, figure 4 shows another configuration of a phasor field, figure 5 shows a further configuration of a phasor field, and figure 6 shows a second exemplary embodiment of an arrangement according to the invention in which evaluation modules of the arrangement are formed by software applications for a control device. In figures 1 to 6, the same reference symbols are always used for identical or comparable components, for reasons of clarity. Figure 1 reveals a control device 10, which is connected to three measuring devices PMU1, PMU2 and PMU3 via a data transmission network 20. The three measuring devices PMU1, PMU2 and PMU3 are so-called phasor measurement units, for example, which measure current and voltage values of a power transmission line, which is not illustrated any further in figure 1, and generate corresponding phasor measured values. The phasor measured values are transmitted together with the respective measurement instants ti in the form of data records Dl, D2 and D3 via the data transmission network 20 to the control device 10. It is assumed below by way of example that the measuring device PMU1 transmits in its data records Dl a voltage phasor measured value - called voltage phasor for short hereinafter - Vll and also an associated current phasor measured value - called current phasor hereinafter - 111 to the control device 10. The data records D2 of the second measuring device PMU2 respectively contain a voltage phasor V21 and a current phasor 121. The third measuring device PMU3 transmits two voltage phasors V31 and V32 arid a current phasor 131 in its data records D3. Two evaluation modules 60 and 70 are connected to the control device 10, said evaluation modules, as separate evaluation devices embodied as hardware, being connected to the control device 10 via electrical connecting lines 80. Furthermore, a memory device 100 with a database 110, in which the control device 10 stores the measured values, that is to say the voltage and current phasors, of the three measuring devices PMU1, PMU2 and PMU3, is connected to the control device 10. The arrangement in accordance with figure 1 can be operated as follows, for example: The control device 10 evaluates the data records Dl, D2 and D3 received from the three measuring devices PMU1, PMU2 and PMU3 and thus receives the voltage phasors VI1, V21, V31 and V32 and also the current phasors 111, 121 and 131. Since the data records Dl, D2 and D3 also in each case contain the respective measurement instants ti, the control device 10 can also ascertain the respective measurement instant for each phasor measured value. The control device 10 makes the corresponding phasor measured values available directly to the two evaluation modules 60 and 70, such that the latter can access the corresponding measured values immediately even before the latter are stored in the memory device 100; a considerable gain in speed is achieved by this procedure, namely because the evaluation modules 60 and 70 can already directly process further the present phasor measured values and do not first have to read out said values from the memory device 100 in a relatively time-consuming manner. However, the control device 10 does not only make the phasor measured values available to the evaluation modules 60 and 70, but also subsequently stores them in the database 110. In this case, the storage of the data in the database 110 is effected in a structured manner. Specifically, all phasor measured values which relate to the same measurement instant ti are stored logically in the same row of a memory matrix file - called matrix for short hereinafter. In this case, the respective column of the matrix indicates from which of the measuring devices PMU1, PMU2 or PMU3 the respective measured value originates. The storage of the matrix is preferably effected not only logically but also physically in matrix form in a corresponding memory section. The structure of the matrix is shown in greater detail in figure 2 and identified by the reference symbol 200. It can be seen that the voltage phasors Vll of the measuring device PMU1 are entered in the first column Si of the matrix 200. The current phasors 111 of the measuring device PMU1 are entered in the second column S2. In a corresponding manner, the phasor measured values of the second measuring device PMU2 are stored in the columns S3 and S4 and the phasor measured values V31, V32 and 131 of the third measuring device PMU3 are stored in the columns S5, S6 and S7. When storing the phasor measured values in the matrix 200 it is ensured here that all measured values which relate to the same instant ti are stored in the same row. It can be seen that the phasor measured values at the instant ti are stored in the i-th row Zi and the measured values at the instant ti+1 are stored in the (i+l)-th row Zi+1. The same correspondingly holds true for the (i+2)-th instant, which is stored in the row Zi+2, etc. Figure 2 furthermore illustrates a one-dimensional phasor field 210, which has exactly the same number of columns as the matrix 200. The fields of the phasor field 210 in each case store, for each column of the matrix 200, that is to say column- individually, that row Zj of the matrix 200 in which the respective next measured value is to be entered. The phasor field 210 thus makes it possible to ensure that arriving phasor measured values which relate to different measurement instants are nevertheless entered at the correct location within the matrix 200. This will be explained in greater detail below on the basis of an example: If it is assumed that the first measuring device PMU1 is arranged particularly close to the control device 10, then the phasor measured values Vll and 111 will arrive before the corresponding phasor measured values of the remaining measuring devices PMU2 and PMU3. This is shown by way of example in figure 3, in which the phasor measured values that have currently arrived are represented by a vertically running bar. In the exemplary embodiment in accordance with figure 3, therefore, the phasor measured values Vll and 111 of the first measuring device PMU1 have already arrived up to the measurement instant t6. The third measuring device PMU3 is further away from the control device 10, such that its phasor measured values V31, V32 and 131 arrive at the control device 10 somewhat later than the corresponding phasor measured values of the first measuring device PMU1. In the example in accordance with figure 3, the phasor measured values V31, V32 and 131 are present only up to the instant t5, whereas no phasor measured values have arrived yet at the control device 10 for the measurement instant t6. In the exemplary embodiment in accordance with figure 3, the second measuring device PMU2 is particularly far away from the control device 10, such that phasor measured values V21 and 121 from this measuring device are only present up to the measurement instant t4. In order, despite the temporally offset arrival of the phasor measurement variables, nevertheless to ensure that each phasor measured value is always entered at the correct location within the matrix 200, firstly the phasor field 210 is read. Consequently, upon arrival of each new phasor measured value, the control device 10 will firstly look up in the phasor field 210 that row in which the respective next phasor measured value has to be entered. If new phasor measured values of the first measuring device PMU1 arrive, for example, then the control device 10 will ascertain, after the read-out of the phasor field 210, that the next phasor measured values Vll and 111 have to be entered into the seventh row Z7 since the measured values relate to the seventh measurement instant t7. The control device 10 will read the phasor field 210 in a corresponding manner if new phasor measured values V21 and 121 of the second measuring device PMU2 are received: in this case, the control device 10 will ascertain that the respective new phasor measured values have to be stored in the fifth row Z5 since they relate to the fifth measurement instant t5. New phasor measured values of the third measuring device PMU3 are stored in the sixth row Z6 in a corresponding manner since they relate to the sixth measurement instant t6. As can be seen in figure 2, the measurement instants tl to t6 as such are not stored in the matrix 200, in order to save memory space. On account of the matrix structure, such storage of the measurement instants ti is not necessary either, since the measured values are stored successively in structured fashion in the matrix 200. Since only measured values of one and the same measurement instant ti are respectively stored in each of the rows Zi, it is possible, namely, to calculate the measurement instant for all measured values of the matrix 200 if the absolute measurement instant or the absolute time of day of the recording of the measurement is known for at least one row and if the measured values of the three measuring devices PMU1, PMU2 and PMU3 are recorded in a temporally correlated manner in a predetermined clock cycle or temporally equidistantly. This will be illustrated on the basis of the example below: If the measuring devices PMU1, PMU2 and PMU3 detect a new measured value in each case every 25 ms, then it is possible to calculate, for each row of the matrix 200 and hence for each measured value, the absolute measurement instant tj or the time of day of the measured value detection, by evaluating the respective row value in accordance with: tj = (Zj-Zi) * T + ZA tj = (Zj-Zi) * 25ms + ZA where Zj denotes the j-th row of the matrix, Zi denotes the i-th row of the matrix, T denotes the time period of 25 ms between two successive measurement instants which is predetermined for the measuring devices PMU1, PMU2 and PMU3, and ZA denotes the stored absolute measurement instant. As a result it can be established that the arrangement in accordance with figure 1 enables the data records Dl to D3 to be processed very rapidly because the control device 10 on the one hand makes the phasor measured values available immediately to the evaluation modules 60 and 70 in order to enable rapid or near- instantaneous evaluation, and on the other hand performs the storage of the phasor measured values in matrix form in the memory device 100, thereby enabling rapid access to all measured values which were recorded in the same measurement time period. As a result of the blockwise or bundled storage of temporally interrelated measured values within the matrix 200 it is possible, namely, for a database interrogation, to copy the relevant section of the database or the relevant section of the matrix into a buffer memory, implemented in the control device 10, for example, in order to enable a rapid access to all the phasor measured values lying in the area relevant to the respective evaluation. Consequently, it is not necessary to open the entire database 110 or the entire matrix 200, but rather only parts of the database 110 or parts of the matrix, whereby access to the respectively desired data records or phasor measured values is significantly accelerated. If the measured values in the database were not distributed in matrix form but rather arbitrarily, then the entire database would have to be accessed, which would involve a very high outlay in the case of a large database; this is shown by the following numerical example: if, by way of example, the measured values are intended to be stored in a 10-bit format and the measured values from 1000 measuring devices are intended to be detected every 100 ms and kept for 30 days, this results in a file size of 2.59 TB. If the measured values were distributed in unstructured fashion in this file, then the entire file would have to be taken into account in the context of an evaluation, which would necessitate a considerable buffer memory and also a considerable read-out time. On account of the measured values being stored logically in matrix form, however, it is known precisely in which file section the measured values from a relevant time segment will be found, such that only this relatively small file section of interest has to be copied into a buffer memory and evaluated. As a result of the measured values being stored in matrix form, it is furthermore possible to achieve a very simple limitation of the file size or the size of the database 110, by carrying out a "ring-shaped" storage: this means that when a maximum row number is reached, the system begins again with the first row of the matrix 200 in accordance with figure 2 and the old content stored therein is overwritten. Consequently, the storage of the measured values is effected cyclically, the measured values of each preceding measurement cycle being overwritten by the measured values of the respective present measurement cycle. During an overwriting of old data, the function of the phasor field 210 consists, moreover, in indicating that row of the matrix 200 up to which the measured values are up-to-date or belong to the present cycle and that row of the matrix starting from which the measured values of the preceding cycle are stored. With regard to simple monitoring as to whether or not measured values of a measurement instant have already been stored, in accordance with an alternative configuration of the phasor field 210, the instant of the last measured value can also be stored alongside the present row number; this is shown by way of example in figure 4: it can be seen that the instant of the last entered measured value is also indicated alongside the row number for the next measured value. The data can be stored in a one-dimensional phasor field, as is shown in figures 2 and 4; as an alternative, it is also possible to use a two- or multidimensional phasor field, as shown by way of example in figure 5. A second exemplary embodiment of an arrangement is shown in figure 6. In this exemplary embodiment, the two evaluation modules 60 and 7 0 are not embodied as separate components, but rather as software modules or software applications which are executable on a processor unit 10' in the control device 10. For the function of these software modules it is unimportant where they are physically stored; by way of example, they can be stored within the control device 10, in a separate memory area of the memory device 100 or in any other memory in the arrangement. Patent Claims 1. An arrangement comprising a control device (10), a memory device (100) driven by the control device, and at least two measuring devices (PMU1, PMU2, PMU3) which are connected to the control device and, in a temporally correlated manner in each case at the same measurement instants, record measured values (Vll, 111, V21, 121, V31, V32, 131) and transmit them to the control device, characterized in that the control device1 "is configured in such a way that it stores the measured values of the two measuring devices in the memory device in the form of a logical matrix (200) having rows (Zi) and columns (S1-S7), wherein it assigns to each measuring device an individual column in which the measured values of the respective measuring device are stored, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out in a manner correlated row by row by virtue of that fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. 2. The arrangement as claimed in claim 1, characterized in that the number of rows in the matrix is limited to a fixedly predetermined maximum number of rows, and in that the control device, after writing to the last row of each column of the matrix, jumps back to the first row of the respective column and enters the respective next measured value of the respective measuring device into the first row of the respective column. 3. The arrangement as claimed in claim 2, characterized in that the control device is configured in such a way that it accesses a phasor field (210), in which has been entered, for each measuring device and thus for each column of the matrix, an information item indicating that row in which the respective next measured value is to be entered. 4. The arrangement as claimed in any of the preceding claims, characterized in that the control device is configured in such a way that it stores, for at least one row of the matrix, an absolute time indication indicating the measurement instant of the measured values stored in this row. 5. The arrangement as claimed in claim 4, characterized in that the control device is configured in such a way that it overwrites the stored absolute time indication in each case with a new absolute time indication as soon as a measured value with a more up-to-date measurement instant by comparison with the stored time indication is entered into the row. 6. The arrangement as claimed in any of the preceding claims, characterized in that the control device is configured in such a way that it enters into the phasor field (210) in each case column-individually at least one indication which reveals indirectly or directly: the row into which the respective next measured value of the respective column is to be entered into the matrix, and/or an absolute time indication indicating the measurement instant of the last entered measured value of the respective column. 7. A method for storing measured values (Vll, 111, V21, 121, V31, V32, 131) of at least two measuring devices (PMU1, PMU2, PMU3), characterized in that the measured values of the measuring devices are recorded in a temporally correlated manner and are stored in a memory device (100) in the form of a logical matrix (200) having rows (Zi) and columns (S1-S7), an individual column is in each case assigned to each measuring device and the measured values of the respective measuring device are stored in said column, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out in a manner correlated row by row by virtue of the fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. 8. The method as claimed in claim 7, characterized in that the number of rows in the matrix is limited to a fixedly predetermined maximum number of rows, and in that, after writing to the last row of each column of the matrix, the method involves jumping back to the first row of the respective column and the respective next measured value of the respective measuring device is entered into the first row of the respective column. 9. The method as claimed in claim 7 or 8, characterized in that a phasor field (210) is accessed, in which is entered, for each measuring device and thus for each column of the matrix, an information item indicating that row in which the respective next measured value is to be entered. 10. The method as claimed in any of the preceding claims 7-9, characterized in that an absolute time indication is stored for at least one row of the matrix, said absolute time indication indicating the measurement instant of the measured values stored in this row. 11. The method as claimed in any of the preceding claims 7-10, characterized in that the stored absolute time indication is overwritten in each case with a new absolute time indication as soon as a measured value with a more recent measurement instant by comparison with the stored time indication is entered in this row. 12. The method as claimed in any of the preceding claims 7-11, characterized in that the following is entered into the phasor field (210) in each case column-individually by direct or indirect indication: the row into which the respective next measured value of the respective column is to be entered into the matrix, and/or an absolute time indication indicating the measurement instant of the last entered measured value of the respective column. 13. A control device for an arrangement as claimed in any of the preceding claims 1-6, characterized in that the control device is configured in such a way that it stores the measured values of two measuring devices in a memory device in the form of a logical matrix having rows and columns, wherein it assigns to each measuring device an individual column in which the measured values of the respective measuring device are stored, wherein a new measured value of each measuring device is in each case entered into the next row of the respective column, and wherein the storage of the measured values of different measuring devices is carried out in a manner correlated row by row by virtue of the fact that measured values of different measuring devices which relate to the same measurement instant are stored in the same row. The invention relates to, inter alia, an arrangement comprising a control device (10), a storage device (100) controlled by a control device and at least two measuring device (PMU),PMU2,MPU3) that are connected to the control device and that receive measured values (VII, 111, V21, 12 1, V31, V32, 131) that are temporally correlated to respectively the same measurement instances and transmit them to the control device. According to the invention, the control device is ddesigned in such a manner that it stores the measured values of the two measuring device in the storage device in the form of a logical matrix (200) comprisin g lines (Zi) and columns (S1-S7). Each measuring device is associated with an individual column in which the measured values of the respective measuring device are stored. A new measured value of each measuring device is respectively input into the subsequent line of the respective column and the measured values of different measurement devices are stored in a correlated, line by line manner, the measured values of the different measuring devices relating to the same measurement instance are stored in the same line.

Full Text

Description
Arrangement and method for storing measured values, in
particular for monitoring power transmission systems
The invention relates to an arrangement comprising a control
device, a memory device driven by the control device, and at
least two measuring devices which are connected to the control
device and, in a temporally correlated manner in each case at
the same measurement instants, record measured values and
transmit them to the control device.
Arrangements of this type are used for example in the field of
protection technology. They serve for example to detect and
evaluate current and voltage in and on power transmission lines
or in power transmission systems in order to detect
impermissible or hazardous operating states and, if
appropriate, to turn off installation parts as rapidly as
possible, with the aim of keeping damage at a low level or
avoiding it - as far as possible.
Since, in order to establish a fault or a disturbance, in part
not only the respective present measured values but also
moreover temporally preceding, old measured values have to be
taken into account, it is necessary to buffer-store the
measured values at least for a certain time period. With regard
to a subsequent analysis of cases of disturbance, it is usually
desirable here for the storage time period to be as long as
possible and to amount to a number of days, for example.
However, the longer the storage time period, the larger the set
of measured values becomes which has to be managed and the
longer the access times become to individual measured values
which are contained or - described illustratively - hidden
within the set of measured values. Although standard database
systems

that are commercially available readily enable even extremely
large volumes of data to be handled, the access times thereof
are usually too long for a use for example in the field of
protection technology for power transmission installations, as
has been ascertained by the inventor, in the case of large sets
of measured values.
Accordingly, the invention is based on the object of specifying
an arrangement which enables a long storage time period and
nevertheless permits a minimal access time to stored measured
values.
Proceeding from an arrangement of the type specified in the
introduction, this object is achieved according to the
invention by means of the characterizing features of claim 1.
Advantageous configurations of the invention are specified in
dependent claims.
Accordingly, the invention provides for the control device to
be configured in such a way that it stores the measured values
of the at least two measuring devices in the memory device in
the form of a logical matrix having rows and columns, wherein
it assigns to each measuring device an individual column in
which the measured values of the respective measuring device
are stored, wherein a new measured value of each measuring
device is in each case entered into the next row of the
respective column, and wherein the storage of the measured
values of different measuring devices is carried out in a
manner correlated row by row by virtue of the fact that
measured values of different measuring devices which relate to
the same measurement instant are stored in the same row.
An essential advantage of the arrangement according to the
invention can be seen in the fact that stored measured values
can be accessed relatively rapidly. This can be attributed to
the fact

that the measured values are stored in a structured manner
based on measurement instants. This is because if an evaluation
module, whether it be a hardware evaluation device or a
software evaluation application, wishes to have recourse to
temporally preceding measured values, then it will generally
not interrogate individual measured values from a wide variety
of measurement instants, but rather measured value sets with
measured values of different measuring devices from a specific
time interval. Since, on account of the structured storage of
the measured values that is provided according to the
invention, all measured values which go back to the same
measurement instant or to a specific measurement time interval
are stored logically directly alongside and beneath one another
in the memory device, for interrogating the measured values it
is not necessary for the entire measured value data set
available to be taken into account and searched; rather, it
suffices for only the relevant memory section to be transmitted
into a buffer memory, for example of the control device, and
for only this relevant memory section to be used further. The
access time to the requested or required measured values is
significantly reduced as a result. In other words, the
invention thus makes use of the insight that in practice, in
particular in the field of protection and control technology,
data records are not interrogated arbitrarily, but rather
usually according to a predetermined pattern relating to the
measurement instants. This forms the starting point of the
invention in that the expected or highly probable interrogation
pattern is already taken into account during the storage of the
data, whereby the subsequent interrogation process is
accelerated.
Preferably, the memory area that is permissible or enabled for
storing the measured values is limited in order to ensure that
other devices such as evaluation modules and the like retain a
sufficient memory area

available within the memory device. Accordingly, in accordance
with one preferred configuration of the arrangement, it is
regarded as advantageous if the number of rows in the matrix is
limited to a fixedly predetermined maximum number of rows, and
if the control device, after writing to the last row of each
column of the matrix, jumps back to the first row of the
respective column and enters the respective next measured value
of the respective measuring device into the first row of the
respective column.
Although the measuring devices are intended to and will always
record their measured values at the same instants, such that
these always relate to identical instants, the measured values
will not be able to reach the control device simultaneously.
This is because if one of the measuring devices is arranged
significantly nearer to the control device than another
measuring device, then the measured values of the locally
nearer measuring device will generally arrive at the control
device more rapidly than those of the remote measuring device.
In order to have the effect, in a simple manner and thus
advantageously, that all measured values arriving at the
control device are nevertheless always stored at the correct
matrix location or as a correct matrix element, in accordance
with one preferred configuration of the arrangement it is
provided that the control device is configured in such a way
that it firstly accesses a phasor field, in which has been
entered, for each measuring device and thus for each column of
the matrix, an information item indicating indirectly or
directly that row in which the respective next measured value
is to be entered.
Since the measured values are stored temporally row by row,
storage of the absolute measurement instants or storage of the
times of day of the measured value detection for each measured
value individually is not necessary. Rather, in accordance with
one

preferred variant, it suffices if the control device is
configured in such a way that it stores, only for a subset of
the rows but at least for one row of the matrix (e.g. for the
i-th row), in each case an absolute time indication indicating
the measurement instant of the measured values stored in this
row. By way of example, a single absolute time indication is
held for each column of the matrix. The measurement instants tj
of the remaining measured values in other rows of the matrix
can then be determined in a simple manner by multiplying the
difference between the row numbers by the temporal measured
value detection interval and adding the absolute time
indication ZA, for example in accordance with:

where Zj denotes the j-th row of the matrix, Zi denotes the
i-th row of the matrix for which the absolute time indication
ZA is stored, T denotes the time period between two successive
measurement instants which is predetermined for the measuring
devices, and f denotes the measurement clock cycle which is
predetermined for the measuring devices.
Preferably, the control device is configured in such a way that
it overwrites the stored absolute time indication in each case
with a new absolute time indication as soon as a measured value
with a more up-to-date measurement instant by comparison with
the stored time indication is entered into the row.
Particularly preferably, the following is entered into a phasor
field in each case column-individually by an indirect or direct
indication: the row, into which the respective next measured
value of the respective column of the matrix or of the
respective measuring device is to be entered, and also an
absolute time

indication indicating the measurement instant of the last
entered measured value of the respective column. An indirect
indication should be understood in this context to mean an
indication from which the row and/or the time indication can be
derived: it is thus possible to indicate for example the last
row in which the last measured value was input, or instead the
new row into which a new measured value is to be input.
The invention additionally relates to a method for storing
measured values of at least two measuring devices.
In order, in the case of such a method, to have the effect that
a long storage time period is made possible and a minimal
access time to stored measured values is nevertheless achieved,
the invention provides for the measured values of the measuring
devices to be recorded in a temporally correlated manner and to
be stored in a memory device in the form of a logical matrix
having rows and columns, wherein an individual column is in
each case assigned to each measuring device and the measured
values of the respective measuring device are stored in said
column, wherein a new measured value of each measuring device
is in each case entered into the next row of the respective
column, and wherein the storage of the measured values of
different measuring devices is carried out in a manner
correlated row by row by virtue of the fact that measured
values of different measuring devices which relate to the same
measurement instant are stored in the same row.
With regard to the advantages of the method according to the
invention and with regard to advantageous configurations of the
method, reference should be made to the above explanations in
connection with the arrangement according to the invention.

A control device is additionally regarded as invention.
With regard to such a control device, the invention provides for
the control device to be configured in such a way that it stores
the measured values of at least two measuring devices in a memory
device in the form of a logical matrix having rows and columns,
wherein it assigns to each measuring device an individual column
in which the measured values of the respective measuring device
are stored, wherein a new measured value of each measuring device
is in each case entered into the next row of the respective
column, and wherein the storage of the measured values of
different measuring devices is carried out. in a manner correlated
row by row by virtue of the fact that measured values of different
measuring devices which relate to the same measurement instant are
stored in the same row.
With regard to the advantages of the control device according to
the invention and with regard to advantageous configurations of
the control device, reference should be made to the above
explanations in connection with the arrangement according to the
invention.
The invention is explained in more detail below on the basis of
exemplary embodiments; in this case, by way of example:
figure 1 shows a first exemplary embodiment of an arrangement in
which evaluation modules are formed by separate
evaluation devices which are realized as hardware and
which are connected to a control device - the method
according to the invention is also explained by way of
example on the basis of this exemplary embodiment -,
figure 2 schematically shows a matrix structure in accordance with
which the measured values of the arrangement in
accordance with figure 1 are stored, and also an
associated phasor field,

figure 3 schematically shows the temporal profile of measured
value storage,
figure 4 shows another configuration of a phasor field,
figure 5 shows a further configuration of a phasor field, and
figure 6 shows a second exemplary embodiment of an arrangement
according to the invention in which evaluation
modules of the arrangement are formed by software
applications for a control device.
In figures 1 to 6, the same reference symbols are always used
for identical or comparable components, for reasons of clarity.
Figure 1 reveals a control device 10, which is connected to
three measuring devices PMU1, PMU2 and PMU3 via a data
transmission network 20. The three measuring devices PMU1, PMU2
and PMU3 are so-called phasor measurement units, for example,
which measure current and voltage values of a power
transmission line, which is not illustrated any further in
figure 1, and generate corresponding phasor measured values.
The phasor measured values are transmitted together with the
respective measurement instants ti in the form of data records
Dl, D2 and D3 via the data transmission network 20 to the
control device 10.
It is assumed below by way of example that the measuring device
PMU1 transmits in its data records Dl a voltage phasor measured
value - called voltage phasor for short hereinafter - Vll and
also an associated current phasor measured value - called
current phasor hereinafter - 111 to the control device 10. The
data records D2 of the second measuring device PMU2
respectively contain a voltage phasor V21 and a current phasor
121. The third measuring device PMU3 transmits

two voltage phasors V31 and V32 arid a current phasor 131 in its
data records D3.
Two evaluation modules 60 and 70 are connected to the control
device 10, said evaluation modules, as separate evaluation
devices embodied as hardware, being connected to the control
device 10 via electrical connecting lines 80.
Furthermore, a memory device 100 with a database 110, in which
the control device 10 stores the measured values, that is to
say the voltage and current phasors, of the three measuring
devices PMU1, PMU2 and PMU3, is connected to the control device
10.
The arrangement in accordance with figure 1 can be operated as
follows, for example:
The control device 10 evaluates the data records Dl, D2 and D3
received from the three measuring devices PMU1, PMU2 and PMU3
and thus receives the voltage phasors VI1, V21, V31 and V32 and
also the current phasors 111, 121 and 131. Since the data
records Dl, D2 and D3 also in each case contain the respective
measurement instants ti, the control device 10 can also
ascertain the respective measurement instant for each phasor
measured value.
The control device 10 makes the corresponding phasor measured
values available directly to the two evaluation modules 60 and
70, such that the latter can access the corresponding measured
values immediately even before the latter are stored in the
memory device 100; a considerable gain in speed is achieved by
this procedure, namely because the evaluation modules 60 and 70
can already directly process further the present phasor
measured values and do not first

have to read out said values from the memory device 100 in a
relatively time-consuming manner.
However, the control device 10 does not only make the phasor
measured values available to the evaluation modules 60 and 70,
but also subsequently stores them in the database 110. In this
case, the storage of the data in the database 110 is effected
in a structured manner. Specifically, all phasor measured
values which relate to the same measurement instant ti are
stored logically in the same row of a memory matrix file -
called matrix for short hereinafter. In this case, the
respective column of the matrix indicates from which of the
measuring devices PMU1, PMU2 or PMU3 the respective measured
value originates. The storage of the matrix is preferably
effected not only logically but also physically in matrix form
in a corresponding memory section.
The structure of the matrix is shown in greater detail in
figure 2 and identified by the reference symbol 200. It can be
seen that the voltage phasors Vll of the measuring device PMU1
are entered in the first column Si of the matrix 200. The
current phasors 111 of the measuring device PMU1 are entered in
the second column S2.
In a corresponding manner, the phasor measured values of the
second measuring device PMU2 are stored in the columns S3 and
S4 and the phasor measured values V31, V32 and 131 of the third
measuring device PMU3 are stored in the columns S5, S6 and S7.
When storing the phasor measured values in the matrix 200 it is
ensured here that all measured values which relate to the same
instant ti are stored in the same row. It can be seen that the
phasor measured values at the instant ti are stored in the i-th
row Zi and the measured values at the instant ti+1

are stored in the (i+l)-th row Zi+1. The same correspondingly
holds true for the (i+2)-th instant, which is stored in the row
Zi+2, etc.
Figure 2 furthermore illustrates a one-dimensional phasor field
210, which has exactly the same number of columns as the matrix
200. The fields of the phasor field 210 in each case store, for
each column of the matrix 200, that is to say column-
individually, that row Zj of the matrix 200 in which the
respective next measured value is to be entered. The phasor
field 210 thus makes it possible to ensure that arriving phasor
measured values which relate to different measurement instants
are nevertheless entered at the correct location within the
matrix 200. This will be explained in greater detail below on
the basis of an example:
If it is assumed that the first measuring device PMU1 is
arranged particularly close to the control device 10, then the
phasor measured values Vll and 111 will arrive before the
corresponding phasor measured values of the remaining measuring
devices PMU2 and PMU3. This is shown by way of example in
figure 3, in which the phasor measured values that have
currently arrived are represented by a vertically running bar.
In the exemplary embodiment in accordance with figure 3,
therefore, the phasor measured values Vll and 111 of the first
measuring device PMU1 have already arrived up to the
measurement instant t6.
The third measuring device PMU3 is further away from the
control device 10, such that its phasor measured values V31,
V32 and 131 arrive at the control device 10 somewhat later than
the corresponding phasor measured values of the first measuring
device PMU1. In the example in accordance with figure 3, the
phasor measured values V31, V32 and 131 are present only up to
the instant t5,

whereas no phasor measured values have arrived yet at the
control device 10 for the measurement instant t6.
In the exemplary embodiment in accordance with figure 3, the
second measuring device PMU2 is particularly far away from the
control device 10, such that phasor measured values V21 and 121
from this measuring device are only present up to the
measurement instant t4.
In order, despite the temporally offset arrival of the phasor
measurement variables, nevertheless to ensure that each phasor
measured value is always entered at the correct location within
the matrix 200, firstly the phasor field 210 is read.
Consequently, upon arrival of each new phasor measured value,
the control device 10 will firstly look up in the phasor field
210 that row in which the respective next phasor measured value
has to be entered. If new phasor measured values of the first
measuring device PMU1 arrive, for example, then the control
device 10 will ascertain, after the read-out of the phasor
field 210, that the next phasor measured values Vll and 111
have to be entered into the seventh row Z7 since the measured
values relate to the seventh measurement instant t7.
The control device 10 will read the phasor field 210 in a
corresponding manner if new phasor measured values V21 and 121
of the second measuring device PMU2 are received: in this case,
the control device 10 will ascertain that the respective new
phasor measured values have to be stored in the fifth row Z5
since they relate to the fifth measurement instant t5.
New phasor measured values of the third measuring device PMU3
are stored in the sixth row Z6 in a corresponding manner since
they relate to the sixth measurement instant t6.

As can be seen in figure 2, the measurement instants tl to t6
as such are not stored in the matrix 200, in order to save
memory space. On account of the matrix structure, such storage
of the measurement instants ti is not necessary either, since
the measured values are stored successively in structured
fashion in the matrix 200. Since only measured values of one
and the same measurement instant ti are respectively stored in
each of the rows Zi, it is possible, namely, to calculate the
measurement instant for all measured values of the matrix 200
if the absolute measurement instant or the absolute time of day
of the recording of the measurement is known for at least one
row and if the measured values of the three measuring devices
PMU1, PMU2 and PMU3 are recorded in a temporally correlated
manner in a predetermined clock cycle or temporally
equidistantly. This will be illustrated on the basis of the
example below:
If the measuring devices PMU1, PMU2 and PMU3 detect a new
measured value in each case every 25 ms, then it is possible to
calculate, for each row of the matrix 200 and hence for each
measured value, the absolute measurement instant tj or the time
of day of the measured value detection, by evaluating the
respective row value in accordance with:
tj = (Zj-Zi) * T + ZA
tj = (Zj-Zi) * 25ms + ZA
where Zj denotes the j-th row of the matrix, Zi denotes the
i-th row of the matrix, T denotes the time period of 25 ms
between two successive measurement instants which is
predetermined for the measuring devices PMU1, PMU2 and PMU3,
and ZA denotes the stored absolute measurement instant.
As a result it can be established that the arrangement in
accordance with figure 1 enables the data records Dl to D3 to
be processed

very rapidly because the control device 10 on the one hand
makes the phasor measured values available immediately to the
evaluation modules 60 and 70 in order to enable rapid or near-
instantaneous evaluation, and on the other hand performs the
storage of the phasor measured values in matrix form in the
memory device 100, thereby enabling rapid access to all
measured values which were recorded in the same measurement
time period. As a result of the blockwise or bundled storage of
temporally interrelated measured values within the matrix 200
it is possible, namely, for a database interrogation, to copy
the relevant section of the database or the relevant section of
the matrix into a buffer memory, implemented in the control
device 10, for example, in order to enable a rapid access to
all the phasor measured values lying in the area relevant to
the respective evaluation. Consequently, it is not necessary to
open the entire database 110 or the entire matrix 200, but
rather only parts of the database 110 or parts of the matrix,
whereby access to the respectively desired data records or
phasor measured values is significantly accelerated.
If the measured values in the database were not distributed in
matrix form but rather arbitrarily, then the entire database
would have to be accessed, which would involve a very high
outlay in the case of a large database; this is shown by the
following numerical example: if, by way of example, the
measured values are intended to be stored in a 10-bit format
and the measured values from 1000 measuring devices are
intended to be detected every 100 ms and kept for 30 days, this
results in a file size of 2.59 TB. If the measured values were
distributed in unstructured fashion in this file, then the
entire file would have to be taken into account in the context
of an evaluation, which would necessitate a considerable buffer
memory and also a considerable read-out time. On account of the
measured values being stored logically in matrix form, however,

it is known precisely in which file section the measured values
from a relevant time segment will be found, such that only this
relatively small file section of interest has to be copied into
a buffer memory and evaluated.
As a result of the measured values being stored in matrix form,
it is furthermore possible to achieve a very simple limitation
of the file size or the size of the database 110, by carrying
out a "ring-shaped" storage: this means that when a maximum row
number is reached, the system begins again with the first row
of the matrix 200 in accordance with figure 2 and the old
content stored therein is overwritten. Consequently, the
storage of the measured values is effected cyclically, the
measured values of each preceding measurement cycle being
overwritten by the measured values of the respective present
measurement cycle.
During an overwriting of old data, the function of the phasor
field 210 consists, moreover, in indicating that row of the
matrix 200 up to which the measured values are up-to-date or
belong to the present cycle and that row of the matrix starting
from which the measured values of the preceding cycle are
stored.
With regard to simple monitoring as to whether or not measured
values of a measurement instant have already been stored, in
accordance with an alternative configuration of the phasor
field 210, the instant of the last measured value can also be
stored alongside the present row number; this is shown by way
of example in figure 4: it can be seen that the instant of the
last entered measured value is also indicated alongside the row
number for the next measured value.

The data can be stored in a one-dimensional phasor field, as is
shown in figures 2 and 4; as an alternative, it is also
possible to use a two- or multidimensional phasor field, as
shown by way of example in figure 5.
A second exemplary embodiment of an arrangement is shown in
figure 6. In this exemplary embodiment, the two evaluation
modules 60 and 7 0 are not embodied as separate components, but
rather as software modules or software applications which are
executable on a processor unit 10' in the control device 10.
For the function of these software modules it is unimportant
where they are physically stored; by way of example, they can
be stored within the control device 10, in a separate memory
area of the memory device 100 or in any other memory in the
arrangement.

Patent Claims
1. An arrangement comprising a control device (10), a memory
device (100) driven by the control device, and at least two
measuring devices (PMU1, PMU2, PMU3) which are connected to the
control device and, in a temporally correlated manner in each
case at the same measurement instants, record measured values
(Vll, 111, V21, 121, V31, V32, 131) and transmit them to the
control device,
characterized in that
the control device1 "is configured in such a way that it stores
the measured values of the two measuring devices in the memory
device in the form of a logical matrix (200) having rows (Zi)
and columns (S1-S7),
wherein it assigns to each measuring device an individual
column in which the measured values of the respective
measuring device are stored,
wherein a new measured value of each measuring device is
in each case entered into the next row of the respective
column, and
wherein the storage of the measured values of different
measuring devices is carried out in a manner correlated
row by row by virtue of that fact that measured values of
different measuring devices which relate to the same
measurement instant are stored in the same row.
2. The arrangement as claimed in claim 1,
characterized in that
the number of rows in the matrix is limited to a fixedly
predetermined maximum number of rows, and in that the control
device, after writing to the last row of each column of the
matrix, jumps back to the first row of the respective column

and enters the respective next measured value of the respective
measuring device into the first row of the respective column.
3. The arrangement as claimed in claim 2,
characterized in that
the control device is configured in such a way that it accesses
a phasor field (210), in which has been entered, for each
measuring device and thus for each column of the matrix, an
information item indicating that row in which the respective
next measured value is to be entered.
4. The arrangement as claimed in any of the preceding claims,
characterized in that
the control device is configured in such a way that it stores,
for at least one row of the matrix, an absolute time indication
indicating the measurement instant of the measured values
stored in this row.
5. The arrangement as claimed in claim 4,
characterized in that
the control device is configured in such a way that it
overwrites the stored absolute time indication in each case
with a new absolute time indication as soon as a measured value
with a more up-to-date measurement instant by comparison with
the stored time indication is entered into the row.
6. The arrangement as claimed in any of the preceding claims,
characterized in that
the control device is configured in such a way that it enters
into the phasor field (210) in each case column-individually at
least one indication which reveals indirectly or directly:
the row into which the respective next measured value of
the respective column is to be entered into the matrix,
and/or

an absolute time indication indicating the measurement
instant of the last entered measured value of the
respective column.
7. A method for storing measured values (Vll, 111, V21, 121,
V31, V32, 131) of at least two measuring devices (PMU1, PMU2,
PMU3),
characterized in that
the measured values of the measuring devices are recorded in a
temporally correlated manner and are stored in a memory device
(100) in the form of a logical matrix (200) having rows (Zi)
and columns (S1-S7),
an individual column is in each case assigned to each
measuring device and the measured values of the respective
measuring device are stored in said column,
wherein a new measured value of each measuring device is
in each case entered into the next row of the respective
column, and
wherein the storage of the measured values of different
measuring devices is carried out in a manner correlated
row by row by virtue of the fact that measured values of
different measuring devices which relate to the same
measurement instant are stored in the same row.
8. The method as claimed in claim 7,
characterized in that
the number of rows in the matrix is limited to a fixedly
predetermined maximum number of rows, and in that, after
writing to the last row of each column of the matrix, the
method involves jumping back to the first row of the respective
column and the respective next measured value of the respective
measuring device is entered into the first row of the
respective column.
9. The method as claimed in claim 7 or 8,

characterized in that
a phasor field (210) is accessed, in which is entered, for each
measuring device and thus for each column of the matrix, an
information item indicating that row in which the respective
next measured value is to be entered.
10. The method as claimed in any of the preceding claims 7-9,
characterized in that
an absolute time indication is stored for at least one row of
the matrix, said absolute time indication indicating the
measurement instant of the measured values stored in this row.
11. The method as claimed in any of the preceding claims 7-10,
characterized in that
the stored absolute time indication is overwritten in each case
with a new absolute time indication as soon as a measured value
with a more recent measurement instant by comparison with the
stored time indication is entered in this row.
12. The method as claimed in any of the preceding claims 7-11,
characterized in that
the following is entered into the phasor field (210) in each
case column-individually by direct or indirect indication:
the row into which the respective next measured value of
the respective column is to be entered into the matrix,
and/or
an absolute time indication indicating the measurement
instant of the last entered measured value of the
respective column.
13. A control device for an arrangement as claimed in any of
the preceding claims 1-6,
characterized in that
the control device is configured in such a way that it stores
the measured values of two measuring devices in a memory

device in the form of a logical matrix having rows and columns,
wherein it assigns to each measuring device an individual
column in which the measured values of the respective
measuring device are stored,
wherein a new measured value of each measuring device is
in each case entered into the next row of the respective
column, and
wherein the storage of the measured values of different
measuring devices is carried out in a manner correlated
row by row by virtue of the fact that measured values of
different measuring devices which relate to the same
measurement instant are stored in the same row.

The invention relates to, inter alia, an arrangement
comprising a control device (10), a storage device (100)
controlled by a control device and at least two measuring
device (PMU),PMU2,MPU3) that are connected to the
control device and that receive measured values (VII, 111, V21, 12
1, V31, V32, 131) that are temporally correlated to
respectively the same measurement instances and
transmit them to the control device. According to the
invention, the control device is ddesigned in such a manner that
it stores the measured values of the two measuring device in
the storage device in the form of a logical matrix (200) comprisin
g lines (Zi) and columns (S1-S7). Each measuring device is
associated with an individual column in which the measured
values of the respective measuring device are stored.
A new measured value of each measuring device is respectively
input into the subsequent line of the respective column and the
measured values of different measurement devices are
stored in a correlated, line by line manner, the measured
values of the different measuring devices relating to the same
measurement instance are stored in the same line.

Documents:

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Patent Number

269246

Indian Patent Application Number

123/KOLNP/2009

PG Journal Number

42/2015

Publication Date

16-Oct-2015

Grant Date

12-Oct-2015

Date of Filing

12-Jan-2009

Name of Patentee

SIEMENS AKTIENGESELLSCHAFT

Applicant Address

WITTELSBACHERPLATZ 2, 80333 MUNCHEN

Inventors:

#	Inventor's Name	Inventor's Address
1	ANDREAS LITZINGER	ALTE REUTSTR. 40, 90765 FUERTH

PCT International Classification Number

G05B 23/02

PCT International Application Number

PCT/DE2006/001252

PCT International Filing date

2006-07-14

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA