JP2017153305A - Protection control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protection control device capable of easily confirming a transmission delay time fluctuation.SOLUTION: A protection control device transmits first electricity quantity data which are sampled based on a first sampling signal, to the other protection control device and receives second electricity quantity data which are sampled based on a second sampling signal at a side of the other protection control device, from the other protection control device. The protection control device calculates a first time from output of the first sampling time to the reception of the second electricity quantity data, calculates a first average value of the first times and receives a second average value of second times from output of the second sampling signal to the reception of the first electricity quantity data. The protection control device synchronizes the first and second sampling signals based on the first and second average values and displays the first time on a display as a delay time of transmission from the other protection control device to the protection control device.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a protection control device, and more particularly, to a protection control device for a power system that performs data communication with another protection control device via a transmission line.

  Conventionally, in order to stabilize the operation of the electric power system, a digital protection control device that detects an accident or abnormality occurring in the electric power system has been used. For example, a typical example of the protection control device is a current differential protection relay device for protecting a transmission line.

  The current differential protection relay device measures the terminal current at each terminal, sends and receives digital data to each other via the transmission line, detects a system fault in the protection section from the difference current, and eliminates the accident.

  The transmission path used in this case employs a method of cyclically transmitting data at a predetermined cycle, for example, at a transmission rate of 54 kbps, 1.5 Mbps, or the like. Since this transmission system is premised on the configuration of power-specific communication with special specifications, use of a general-purpose transmission system with large capacity, low cost, and high availability is being studied. However, in the protective relay device, when transmission is performed using the general-purpose transmission method, it is expected that transmission data is congested and transmission delay time fluctuations occur. Patent Document 1 (Japanese Patent Laid-Open No. 2013-169059) discloses a technique for suppressing this transmission delay time fluctuation.

  The protective relay device according to Patent Document 1 is provided at each terminal facing the power system. The protective relay device includes acquisition means and transmission means. The acquisition unit acquires the electric quantity data from the power system at every sampling period. The transmission means transmits M pieces of electric quantity data (2 ≦ M ≦ N) out of the electric quantity data acquired for each sampling period for every N transmission periods N times the sampling period, and protects and relays the counterpart terminal. Transmit to the device.

JP 2013-169059 A

  As described above, when the general-purpose transmission method is adopted as the transmission method in the protection control device, there is a possibility that the transmission delay time fluctuates. Therefore, it is desired to easily confirm how much the fluctuation has occurred. There is a need. Patent Document 1 discloses a technique for suppressing fluctuations in transmission delay time, and does not teach or suggest any technical means that satisfies such needs.

  The present disclosure has been made in view of the above-described problems, and an object in one aspect is to provide a protection control device capable of easily confirming transmission delay time fluctuations.

  A protection control device for a power system according to an embodiment includes a signal output unit that outputs a first sampling signal for determining a timing for sampling an electric quantity of the power system at a predetermined cycle, and a transmission line. And a transmission unit for performing data communication with other protection control devices. The transmission unit transmits the first electrical quantity data sampled based on the first sampling signal to another protection control device, and the first protection data is sampled based on the second sampling signal on the other protection control device side. 2 electrical quantity data is received from another protection control device. The protection control device includes a time calculation unit that calculates a first time from the output of the first sampling signal to the reception of the second electric quantity data, and the first time calculated by the time calculation unit. And an average value calculating unit that calculates a first average value with each first time for the past reference number of times. The transmission unit receives the second average value of the second time calculated from the output of the second sampling signal to the reception of the first electric quantity data, calculated on the other protection control device side. The protection control device corrects the output timing of the first sampling signal based on the first average value and the second average value so as to synchronize the first sampling signal and the second sampling signal. A correction unit and a display control unit for displaying the first time on the display as the transmission delay time of the first transmission from the other protection control device to the protection control device are further provided.

  A protection control device for a power system according to another embodiment includes a signal output unit that outputs a first sampling signal for determining a timing for sampling an electric quantity of the power system at a predetermined cycle, and a transmission path. And a transmission unit that performs data communication with another protection control device. The transmission unit transmits the first electrical quantity data sampled based on the first sampling signal to another protection control device, and the first protection data is sampled based on the second sampling signal on the other protection control device side. 2 electrical quantity data is received from another protection control device. The protection control device includes a time calculation unit that calculates a first time from the output of the first sampling signal to the reception of the second electric quantity data, and the first time calculated by the time calculation unit. And an average value calculating unit that calculates a first average value with each first time for the past reference number of times. The transmission unit receives a second time calculated from the output of the second sampling signal to the reception of the first electrical quantity data, calculated on the other protection control device side. The average value calculation unit further calculates a second average value of the current second time transmitted from the other protection control device and each second time corresponding to the past reference number of times. The protection control device corrects the output timing of the first sampling signal based on the first average value and the second average value so as to synchronize the first sampling signal and the second sampling signal. A correction unit and a display control unit for displaying the first time on the display as the transmission delay time of the first transmission from the other protection control device to the protection control device are further provided.

  According to the present disclosure, it is possible to easily check the transmission delay time fluctuation.

It is a figure which shows the structural example of the protection control system according to this Embodiment. It is a figure for demonstrating the sampling synchronous control system in a protection control apparatus. It is a figure for demonstrating the sampling synchronous control system according to this Embodiment. It is a figure which shows an example of the hardware constitutions of the protection control apparatus according to this Embodiment. It is a schematic diagram which shows the function structure of the protection control apparatus according to this Embodiment. It is a figure which shows an example of the display mode of the transmission delay time according to this Embodiment. It is a figure which shows the process sequence of the protection control apparatus according to this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated. In the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

<System configuration>
FIG. 1 is a diagram showing a configuration example of a protection control system 1000 according to the present embodiment. Referring to FIG. 1, protection control system 1000 includes a substation 1A, a substation 1B, and a transmission path 40. The substation 1A and the substation 1B are connected by a transmission line TL. For example, an Ethernet (registered trademark) network, which is a general-purpose transmission method, is used as the transmission path 40, but an IP network-compatible network that employs another packet communication transmission form may be used. In other words, the transmission line 40 is not a power dedicated communication network adopting a cyclic transmission method, but a standard network that can change the transmission delay time at any time.

  The substation 1A includes a protection control device 10A, a circuit breaker 20A that disconnects the power transmission line at the time of an accident in the power transmission line TL, and a current transformer 30A that detects current information of the power transmission line TL. The substation 1B includes a protection control device 10B, a circuit breaker 20B that disconnects the power transmission line at the time of an accident in the power transmission line TL, and a current transformer 30B that detects current information of the power transmission line TL.

  The protection control devices 10A and 10B (hereinafter also collectively referred to as “protection control device 10”) are typically digital-type current differential protection relay devices. The protection control device 10A takes in the current information of the power transmission line TL from the current transformer 30A, digitally converts the current information, and then exchanges the current information with the protection control device 10B via the transmission line 40.

  The protection control device 10A performs a current differential calculation based on the current information on the own end and the current information on the other end at the same time, and performs an accident determination on the transmission line TL based on a predetermined threshold. When detecting an accident in the transmission line TL, the protection control device 10A outputs a cutoff command (trip signal) to the circuit breaker 20A.

  Since the protection control device 10B performs the same process as the protection control device 10A, the description thereof will not be repeated here.

<Confirmation of transmission delay time>
As described above, in the present embodiment, transmission delay time fluctuations may occur as the transmission line 40 is not shared with a power dedicated communication network adopting a conventional cyclic transmission method, but is shared by other external devices. A general-purpose transmission network is adopted. For this reason, there may be a difference in uplink and downlink transmission delay times from the start of data transmission to the completion of data reception.

  In order to understand the present invention, first, the principle of sampling synchronization control in the protection control apparatus when it can be assumed that the transmission delay time of uplink and downlink is the same will be described.

  FIG. 2 is a diagram for explaining a sampling synchronization control method in the protection control device. Referring to FIG. 2, the second protection control device (corresponding to “second device” in FIG. 2) from the sampling timing of the first protection control device (corresponding to “first device” in FIG. 2). The time until data reception at the sampling timing is TQ. The time from the sampling timing of the second protection control device to the reception of data at the sampling timing of the first protection control device is defined as TG. Further, the transmission delay time of transmission from the second protection control device to the first protection control device is Td1, the transmission delay time of transmission from the first protection control device to the second protection control device is Td2, and sampling synchronization. Let the error be ΔT.

  In this case, TQ = Td1−ΔT and TG = ΔT + Td2. Here, assuming that the transmission delay times Td1 and Td2 of the upstream and downstream transmission lines are the same, in order to set the sampling synchronization error ΔT to 0 (synchronize), the sampling timing is set so that TQ = TG. It can be seen that control is required. For example, the time TQ measured by the first protection control device is transmitted to the second protection control device. The second protection control device shifts the sampling timing so that the measured time TG is the same as the received time TQ. Thereby, sampling (sampling synchronization) at the same time can be realized.

  Next, a sampling synchronization control method according to the present embodiment will be described. In protection control system 1000 according to the present embodiment, uplink and downlink transmission delay times are calculated in the manner described below while synchronizing sampling.

FIG. 3 is a diagram for illustrating the sampling synchronization control method according to the present embodiment.
Referring to FIG. 3, an upward arrow indicates a sampling signal in each protection control device, and electric quantity data sampled in synchronization with the sampling signal is transmitted. For example, the electrical quantity data sampled in the protection control devices 10A and 10B is transmitted at time tn. The protection control device 10A receives the electrical quantity data transmitted from the protection control device 10B at time ta (n). The protection control device 10B receives the electrical quantity data transmitted from the protection control device 10A at time tb (n). The data transmitted / received between the protection control devices 10A and 10B includes information necessary for synchronization of the sampling timing (for example, time TQ, TG) in addition to the electrical quantity data at the sampling timing of each protection control device 10A, 10B. And their average values). The protection control device 10A (or the protection control device 10B) may be configured to transmit the measured electrical quantity data and the calculated time TQ (or time TG) at the same timing (for example, the same packet), The measured electric quantity data and the calculated time TQ (or time TG) may be transmitted in real time at different timings (for example, different packets).

  Here, referring to FIG. 3, it can be seen that the protection control devices 10A and 10B have the same sampling signal output timing (time tn), but different electrical data reception timings. This is the transmission delay time of transmission from the protection control device 10B to the protection control device 10A (hereinafter also referred to as “uplink transmission”) and transmission from the protection control device 10A to the protection control device 10B (hereinafter “downlink transmission”). It also means that the transmission delay time is different. As described above, when there is a variation in each transmission delay time, the synchronization error cannot be corrected by simply using the method described with reference to FIG.

  Therefore, in this embodiment, in order to reduce the influence of this variation, it is used that transmission delay times of uplink transmission and downlink transmission are generally averaged over a long period of time. This is because, in a short period of time, transmission delay times of upstream transmission and downstream transmission vary, but only one (for example, upstream transmission only) is always longer (or shorter) than downstream transmission. This is because the average value of each transmission delay time is considered to be substantially the same over a long period of time.

  Therefore, the protection control device 10A calculates the average value of the time from the output of the sampling signal (when transmitting the electrical quantity data) to the reception of the electrical quantity data from the protection control device 10B. Specifically, the protection control device 10A determines the time TA (n) calculated by the current sampling and each time TA (n−1), TA (n−2),. An average value TAx with (n−k) is calculated. Similarly, the protection control device 10B also calculates an average value TBx of the time from the output of the sampling signal (when transmitting the electrical quantity data) to the reception of the electrical quantity data from the protection control device 10A. The average value TBx is an average value of the current time TB (n) and each time TB (n−k), TB (n−2),..., TB (n−k).

  The protection control device 10A transmits the average value TAx to the protection control device 10B, and receives the average value TBx from the protection control device 10B. Further, the protection control device 10B transmits the average value TBx to the protection control device 10A and receives the average value TAx from the protection control device 10A. For example, the protection control device 10B corrects the sampling timing so that the average value TBx is equal to the received average value TAx. In this case, the correction corresponds to a correction reflecting that each transmission delay time of uplink transmission and downlink transmission is generally averaged over a long period of time, and therefore sampling (sampling synchronization) at almost the same time is performed. realizable.

  As a result, in this embodiment, as shown in FIG. 3, the sampling timings (time tn, tn + 1...) Of the protection control devices 10A and 10B coincide with each other (can be regarded as), and therefore sampling is performed on the receiving side. The time from the signal output to the data reception can be regarded as the transmission delay time. Specifically, time TA (n) (= ta (n) −t (n)) corresponds to the transmission delay time of uplink transmission, and time TB (n) (= tb (n) −t (n)) Corresponds to the transmission delay time of downlink transmission.

  The protection control device 10A can notify the user of the time TA (n) as a transmission delay time of transmission (uplink transmission) from the protection control device 10B to the protection control device 10A at the n-th sampling. . Typically, the protection control device 10A displays the time TA (n) for each measurement count on a built-in display.

<Hardware configuration>
FIG. 4 is a diagram showing an example of a hardware configuration of protection control device 10 according to the present embodiment. Referring to FIG. 4, protection control device 10 includes an auxiliary transformer 50, an AD (Analog to Digital) conversion unit 60, and an arithmetic processing unit 70.

  The auxiliary transformer 50 takes in the grid electricity quantity from the current transformer 30A (or current transformer 30B), converts it into a smaller quantity of electricity, and outputs it.

  The AD conversion unit 60 takes in the grid electricity quantity (analog quantity) output from the auxiliary transformer 50 and converts it into digital data. Specifically, the AD conversion unit 60 includes an analog filter, a sample hold circuit, a multiplexer, and an AD converter.

  The analog filter removes a high frequency noise component from the waveform signal of the current output from the auxiliary transformer 50. The sample hold circuit samples the waveform signal of the current output from the analog filter at a predetermined sampling period. Based on the timing signal input from the arithmetic processing unit 70, the multiplexer sequentially switches the waveform signal input from the sample hold circuit in time series and inputs the waveform signal to the AD converter. The AD converter converts the waveform signal input from the multiplexer from analog data to digital data. The AD converter outputs the digitally converted waveform signal to the arithmetic processing unit 70.

  The arithmetic processing unit 70 includes a CPU (Central Processing Unit) 72, a ROM (Read Only Memory) 73, a RAM (Random Access Memory) 74, a display 75, an output interface (I / F) 76, and an input interface ( I / F) 77 and a communication interface (I / F) 78. These are connected by a bus 71.

  The CPU 72 controls the operation of the protection control device 10 by reading and executing a program stored in the ROM 73 in advance. The ROM 73 stores various information used by the CPU 72. The CPU 72 is, for example, a microprocessor. The hardware may be an FPGA (Field Programmable Gate Array) other than the CPU, an ASIC (Application Specific Integrated Circuit), a circuit having other arithmetic functions, or the like.

  The CPU 72 takes in digital data from the AD conversion unit 60 via the bus 71. The CPU 72 executes control calculation using the acquired digital data according to the program stored in the ROM 73. The CPU 72 transmits a control command to the circuit breaker via the output interface 76 based on the control calculation result.

  Further, the CPU 72 is connected to the transmission path 40 via the communication interface 78 and transmits / receives various information to / from the other protection control device 10. The input interface 77 is typically various buttons or the like, and accepts various setting operations from the system operator.

<Functional configuration>
FIG. 5 is a schematic diagram showing a functional configuration of protection control devices 10A and 10B according to the present embodiment. Referring to FIG. 5, protection control devices 10A and 10B include signal output units 200A and 200B, acquisition units 202A and 202B, transmission units 204A and 204B, time calculation units 206A and 206B, and an average value calculation unit, respectively. 208A and 208B, correction | amendment part 210A and 210B, and display control part 212A and 212B are included. Each of these functions is realized, for example, when the CPU 72 of the arithmetic processing unit 70 executes a program stored in the ROM 73. Note that some or all of these functions may be implemented by hardware.

  In the following description, a functional configuration when the sampling timing is corrected on the protection control device 10A side will be described. Since each functional configuration of the protection control device 10B is the same as each functional configuration of the corresponding protection control device 10A, detailed description thereof will not be given.

  200 A of signal output parts output the sampling signal for determining the timing which samples the electric quantity of an electric power grid | system with a predetermined period (sampling period). Specifically, the signal output unit 200A supplies the sampling signal generated by the internal clock to the acquisition unit 202A, the transmission unit 204A, and the time calculation unit 206A. Thereby, acquisition of electric quantity data and data transmission are executed in synchronization.

  The acquisition unit 202A acquires digital data (instantaneous current value data) of the amount of electricity (here, instantaneous current value) detected by the current transformer 30A for each sampling period. The acquisition unit 202A is not limited to a configuration that acquires current instantaneous value data using a current transformer (CT), and may be a configuration that acquires voltage instantaneous value data using a transformer (VT).

  The transmission unit 204A performs data communication with the other protection control device 10B via the transmission path 40. In the present embodiment, a network of a general-purpose transmission method (for example, an Ethernet network) is used as the transmission path 40. Therefore, typically, the transmission unit 204A performs data communication according to a standard that can change the transmission delay time at any time.

  The transmission unit 204A transmits the electrical quantity data sampled based on the sampling signal (acquired by the acquisition unit 202A) to the protection control device 10B. Further, the transmission unit 204A receives, from the protection control device 10B, other electric quantity data sampled on the protection control device 10B side based on other sampling signals.

  The time calculation unit 206A calculates a time TA from when the sampling signal output by the signal output unit 200A is output to when the other electric quantity data is received. The time calculation unit 206A sequentially stores the calculated time TA. For example, when the time TA from the present time to m sampling cycles before is stored, m + 1 times of TA (n), TA (n-1), TA (n-2), ..., TA (n-m). Is stored in the RAM 74.

  The average value calculation unit 208A includes the current time TA (n) calculated by the time calculation unit 206A and the times TA (n−1), TA (n−2) for the past reference times (for example, k times). ),..., TA (n−k) and an average value TAx are calculated. The reference number of times is predetermined by the user (system operator). For example, the user is set to a number of times (for example, 100 times) at which each transmission delay time of uplink transmission and downlink transmission on the transmission path 40 can be regarded as being approximately averaged.

  The transmission unit 204A is an average of time TB calculated from the output of another sampling signal to the reception of electric quantity data transmitted from the protection control device 10A, calculated on the protection control device 10B side (average value calculation unit 208B). The value TBx is received. Note that the transmission unit 204A may transmit the average value TAx to the protection control device 10B.

  Based on the average value TAx and the average value TBx, the correction unit 210A is configured to synchronize the sampling signal on the protection control device 10A side with the sampling signal on the protection control device 10B side. Correct the output timing. Specifically, the correction unit 210A corrects the output timing by the difference between the average value TAx and the average value TBx. The correction may be performed by the correction unit 210B on the protection control device 10B side. Therefore, the correction unit may have a functional configuration that only one of the protection control devices 10A and 10B has.

  The display control unit 212A causes the display 75 to display the time TA calculated by the time calculation unit 206A as a transmission delay time of uplink transmission from the protection control device 10B to the protection control device 10A. For example, the display control unit 212A displays a numerical value indicating the time TA (n), TA (n−1), TA (n−2),. To display. Further, as shown in FIG. 6, the display control unit 212A may display the transition of the transmission delay time in a graph in time series.

  FIG. 6 is a diagram showing an example of a display mode of transmission delay time according to the present embodiment. Referring to FIG. 6, the horizontal axis indicates the number of calculations (first time, second time, etc.), and the vertical axis indicates the transmission delay time. As shown in FIG. 6, by displaying the transmission delay times for a plurality of times in a graph, it is possible to inform the user (system operator) of the delay time characteristics of the transmission path 40 in operation more easily.

  Referring to FIG. 5 again, in another aspect, transmission unit 204A may further receive time TB calculated on the protection control device 10B side (time calculation unit 206B). In this case, the display control unit 212A causes the display 75 to display the time TB as a transmission delay time for downlink transmission from the protection control device 10A to the protection control device 10B.

  Although the configuration has been described above in which the transmission unit 204A receives the average value TBx of the time TB calculated on the protection control device 10B side, the configuration is not limited thereto. For example, the configuration may be such that the protection control device 10A receives the time TB from the protection control device 10B in real time and calculates the average value TBx of the time TB.

  Specifically, the protection control device 10B transmits each time TB (n), TB (n−1),..., TB (nm) in real time without calculating the average value TBx, The transmission unit 204A receives these. In this case, time series data including m + 1 times of each time TB (n), TB (n−1),..., TB (n−m) received by the transmission unit 204A is stored in the RAM 74. The average value calculation unit 208A includes the current time TB (n) received by the transmission unit 204A and each time TB (n−1), TB (n−2),. An average value TBx with (n−k) is calculated. The correction unit 210A corrects the output timing of the sampling signal on the protection control device 10A side based on the average value TAx and the average value TBx. As described above, when not only the average value TAx but also the average value TBx is calculated on the protection control device 10A side, the average value calculation unit is not an essential functional configuration in the protection control device 10B, but the protection control device 10A. It may be a functional configuration that only has.

<Processing procedure>
FIG. 7 is a diagram showing a processing procedure of the protection control device 10A according to the present embodiment. Here, a case will be described in which the sampling timing is corrected on the protection control device 10A side and the transmission delay time of uplink transmission is displayed. Typically, each step shown in FIG. 7 is executed by the arithmetic processing unit 70 of the protection control device 10A. In the following description, the electric quantity data acquired by the protection control devices 10A and 10B will be referred to as electric quantity data Da and Db, respectively, for distinction.

  Referring to FIG. 7, protection control device 10A acquires (samples) the amount of electricity detected by current transformer 30A (step S10). More specifically, the protection control device 10A samples the acquired electric quantity based on the sampling signal and converts it into digital data, thereby generating electric quantity data Da.

  The protection control device 10A transmits the electric quantity data Da to the protection control device 10B via the transmission path 40 (step S12). The protection control device 10A receives the electric quantity data Db acquired by the protection control device 10B from the protection control device 10B via the transmission path 40 (step S14). The protection control device 10A calculates a time TA from when the sampling signal is output to when the electrical quantity data Db is received (step S16). The protection control device 10A calculates the average value TAx of the time TA (n) calculated this time and the times TA (n−1),..., TA (n−k) calculated at the past sampling timing. (Step S18).

  The protection control device 10A receives the average value TBx calculated by the protection control device 10B from the protection control device 10B via the transmission path 40 (step S20). The protection control device 10A corrects the output timing of the sampling signal based on the average value TAx and the average value TBx (step S22). Specifically, the output timing is corrected so that the average value TAx is the same as the average value TBx.

  The protection control device 10A displays the time TA on the display 75 as a transmission delay time for downlink transmission from the protection control device 10B to the protection control device 10A (step S24). For example, as illustrated in FIG. 6, the protection control device 10A determines that the time TA (n) calculated this time and the times TA (n−1),..., TA (n−k) calculated at past sampling timings. ) In a time-series graph.

<Advantages>
According to the present embodiment, even in a transmission path in which the transmission delay time can vary, the sampling timing of each protection control device can be synchronized almost accurately, so the transmission delay time can be checked almost accurately. Can do.

  According to the present embodiment, a network analyzer, a GPS device for synchronization, and the like are unnecessary, so that the transmission delay time can be easily grasped. In addition, a great amount of work such as preparation or setup of these devices and costs can be reduced.

  According to the present embodiment, it is possible to measure the transmission delay time using the protection control device connected to the actual transmission path. Therefore, it is possible to measure the transmission delay time that reflects the actual transmission state more than simply measuring the transmission delay time using a network analyzer or the like when no actual protection control device is installed. It becomes.

<Modification>
In the embodiment described above, the reference frequency is appropriately set by the system operator in order to synchronize the output timing of the sampling signals of the protection control devices 10A and 10B. Here, if the reference number is too small, there is a possibility that the sampling timings of the protection control devices 10A and 10B may not be synchronized because the output timing of the protection control device on the correction side frequently moves. Further, when the reference number is too large, the output timing of the protection control device on the correction side almost does not move. For this reason, if the sampling timing is once deviated for some reason, it may take time to synchronize the sampling timings of the protection control devices 10A and 10B.

  On the other hand, the fact that the output timing of the correction-side protection control device (for example, the protection control device 10A) does not substantially move means that the electrical quantity data from another protection control device (for example, the protection control device 10B) from the output timing. The variation in time until the reception timing is independent of the output timing. That is, it can be considered that the variation represents the variation in transmission delay time in uplink transmission from the protection control device 10B to the protection control device 10A more accurately.

  Therefore, as a modification of the present embodiment, if the reference number required to synchronize the sampling timings of the protection control devices 10A and 10B is a standard number, a number greater than the standard number is set as the reference number. Thus, an example of more accurately confirming the variation in the transmission delay time will be described.

  Specifically, the protection control devices 10A and 10B according to the modified example further include a setting unit that sets two modes according to the reference count in addition to the functional configuration in FIG. The setting unit is configured to be able to set a normal mode in which the reference number is a standard number (for example, 100 times) and a measurement mode in which the reference number is more than the standard number (for example, 10,000 times). For example, the setting unit switches between the normal mode and the measurement mode according to an instruction from the system operator.

  When the measurement mode is set by the setting unit, the display control unit 212A uses a plurality of times TA as information indicating variation in transmission delay time of uplink transmission from the protection control device 10B to the protection control device 10A. Inform. Specifically, as shown in FIG. 6, the display control unit 212A graphs the time TA for a plurality of times and displays the graph on the display. In this case, the system operator can confirm the variation degree of the transmission delay time of the uplink transmission more accurately by confirming the graphed time TA for a plurality of times.

  The setting unit is configured to be able to set a mode (fixed measurement mode) for fixing the output timing of the sampling signals of the protection control devices 10A and 10B as a mode for measuring the variation in the transmission delay time with higher accuracy. Also good.

  In this case, since the sampling timing is not corrected, the sampling timings of the protection control devices 10A and 10B cannot be synchronized. However, since the output timings of both sampling signals are fixed, for example, the variation in time from the output timing of the protection control device 10A to the reception timing of the electrical quantity data measured by the protection control device 10B It will not depend on timing at all. That is, the variation represents the variation in transmission delay time in uplink transmission from the protection control device 10B to the protection control device 10A with even higher accuracy. Similarly, the variation in time from the output timing of the protection control device 10B to the reception timing of the electrical quantity data measured by the protection control device 10A is a transmission delay time in downlink transmission from the protection control device 10A to the protection control device 10B. This represents the variation in the accuracy even more accurately.

  If the system operator wants to check only the variation in transmission delay time of uplink transmission or downlink transmission without using the original relay function of the protection control devices 10A and 10B, the system operator instructs the setting unit to The control devices 10A and 10B may be set to the fixed measurement mode. In this case, the system operator confirms the time TA (time TB) for a plurality of graphs displayed on the display of the protection control device 10A (protection control device 10B), thereby performing uplink transmission (downlink transmission). It is possible to grasp the degree of variation in transmission delay time with higher accuracy.

[Other embodiments]
In the above-described embodiment, the configuration in which the protection control device 10 displays the transmission delay time and the like has been described, but the configuration is not limited thereto. For example, when the protection control device 10 is connected to an information processing device such as a personal computer, information indicating a transmission delay time is transmitted to the information processing device, and the information processing device side (for example, the information (for example, A graph as shown in FIG. 6 may be displayed.

  In embodiment mentioned above, you may be comprised so that the transmission delay time etc. which the protection control apparatus 10 measured may be transmitted to an external server. The external server stores each transmission delay time transmitted from the protection control device installed in each substation. Thereby, the user can grasp the delay characteristics of each transmission path by accessing each transmission delay time stored in the external server.

  The configuration illustrated as the above-described embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part of the configuration is omitted without departing from the gist of the present invention. It is also possible to change the configuration.

  In the above-described embodiment, the processing and configuration described in the other embodiments may be adopted as appropriate.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1A, 1B substation, 10A, 10B protection control device, 20A, 20B circuit breaker, 30A, 30B current transformer, 40 transmission line, 50 auxiliary transformer, 60 AD conversion unit, 70 arithmetic processing unit, 71 bus, 72 CPU 73 ROM, 74 RAM, 75 display, 76 output interface, 77 input interface, 78 communication interface, 200A, 200B signal output unit, 202A, 202B acquisition unit, 204A, 204B transmission unit, 206A, 206B time calculation unit, 208A, 208B average value calculation unit, 210A, 210B correction unit, 212A, 212B display control unit, 1000 protection control system.

Claims (6)

A protection control device for a power system,
A signal output unit that outputs a first sampling signal for determining the timing of sampling the amount of electricity of the power system at a predetermined period;
A transmission unit that performs data communication with another protection control device via a transmission line;
The transmission unit transmits the first electrical quantity data sampled based on the first sampling signal to the other protection control device, and based on the second sampling signal on the other protection control device side Receiving the sampled second electrical quantity data from the other protection control device;
A time calculation unit for calculating a first time from the output of the first sampling signal to the reception of the second electric quantity data;
An average value calculating unit that calculates a first average value of the first time of the present time calculated by the time calculating unit and each of the first times for a past reference number of times;
The transmission unit calculates a second average value of a second time from the output of the second sampling signal to the reception of the first electric quantity data, calculated on the other protection control device side. Receive
The protection control device includes:
Based on the first average value and the second average value, the output timing of the first sampling signal is corrected so that the first sampling signal and the second sampling signal are synchronized. A correction unit;
A protection control device, further comprising: a display control unit configured to display the first time on a display as a transmission delay time of the first transmission from the other protection control device to the protection control device. The transmission unit further receives the second time calculated on the other protection control device side,
The protection control device according to claim 1, wherein the display control unit causes the display to display the second time as a transmission delay time of a second transmission from the protection control device to the other protection control device.   The protection control device according to claim 1, wherein the display control unit graphs the first time for a plurality of times and displays the first time on the display.   The protection control device according to any one of claims 1 to 3, wherein the transmission unit executes data communication according to a standard that can change a transmission delay time at any time. A setting unit capable of setting a first mode in which the reference number is a first number and a second mode in which the reference number is a second number greater than the first number;
The display control unit displays the first time for a plurality of times on the display as information indicating a variation in transmission delay time of the first transmission when the second mode is set. The protection control apparatus of any one of -4. A protection control device for a power system,
A signal output unit that outputs a first sampling signal for determining the timing of sampling the amount of electricity of the power system at a predetermined period;
A transmission unit that performs data communication with another protection control device via a transmission line;
The transmission unit transmits the first electrical quantity data sampled based on the first sampling signal to the other protection control device, and based on the second sampling signal on the other protection control device side Receiving the sampled second electrical quantity data from the other protection control device;
A time calculation unit for calculating a first time from the output of the first sampling signal to the reception of the second electric quantity data;
An average value calculating unit that calculates a first average value of the first time of the present time calculated by the time calculating unit and each of the first times for a past reference number of times;
The transmission unit receives a second time calculated from the output of the second sampling signal to the reception of the first electric quantity data, calculated on the other protection control device side,
The average value calculation unit further calculates a second average value of the current second time transmitted from the other protection control device and each of the second times corresponding to the reference number of times in the past. ,
The protection control device includes:
Based on the first average value and the second average value, the output timing of the first sampling signal is corrected so that the first sampling signal and the second sampling signal are synchronized. A correction unit;
A protection control device, further comprising: a display control unit configured to display the first time on a display as a transmission delay time of the first transmission from the other protection control device to the protection control device.