JP2022085442A - Protective relay device - Google Patents

Abstract

To provide a protective relay device that can automatically set a set value during operation as a set value applied to the protective relay device after an operation test is completed.SOLUTION: A protective relay device for protecting a power system includes a relay calculation unit that performs relay calculation on the basis of electric energy data and settling data, and a setting unit that sets the settling data. When an operation test of the protective relay device is started, the setting unit sets first settling data at the time of the operation test as the settling data used for the relay calculation. On the basis of the completion of the operation test, the setting unit changes the settling data used for the relay calculation from the first settling data to second settling data at the time of operation for monitoring the power system.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a protective relay device.

Conventionally, in order to stabilize the operation of the electric power system, a protective relay device for detecting an accident occurring in the electric power system has been used. The protective relay device detects the occurrence of an accident by comparing the amount of electricity such as current and voltage collected from the power system with the set value, and outputs a trip signal to the circuit breaker. Typically, the set value used to determine a grid accident is set by a user (eg, a grid operator) based on the equipment of the power grid. For example, Japanese Patent Application Laid-Open No. 2014-3820 (Patent Document 1) discloses a digital protection control device for flexibly editing a group settling value composed of a group of settling values.

Japanese Unexamined Patent Publication No. 2014-3820

The protective relay device is periodically subjected to an operation test to confirm the soundness of its function. In the operation test, the protective relay device is separated from the power system during operation, and the input that simulates the voltage and current at the time of a system accident is given to the protected relay device from the dedicated test device, and the protected relay device performs the desired response. Confirm that it is shown. In many cases, the set value of the protective relay device during the operation test is not the same as the set value during normal operation.

Therefore, before the operation test, the set value at the time of operation is saved as electronic data or the like, and the set value applied to the protective relay device is changed to the set value for the test, and the operation test is performed. Then, after the operation test is completed, the set value applied to the protective relay device is returned to the saved set value at the time of operation. In the case of a compound element protection relay device, there are many settling items, and the operation of changing the settling value for each settling item is generally performed by a human. Therefore, after the operation test is completed, there is a possibility that a human error such as forgetting to return the set value applied to the protective relay device to the set value at the time of operation may occur.

An object of the present disclosure is to provide a protective relay device capable of automatically setting a set value during operation as a set value applied to the protected relay device after the operation test is completed. ..

According to certain embodiments, a protective relay device for protecting the power system is provided. The protective relay device includes a relay calculation unit that performs a relay calculation based on the electric energy data and the settling data, and a setting unit that sets the settling data. When the operation test of the protective relay device is started, the setting unit sets the first settling data at the time of the operation test as the settling data used for the relay calculation. Based on the completion of the operation test, the setting unit changes the settling data used for the relay calculation from the first settling data to the second settling data at the time of operation for monitoring the power system.

According to the present disclosure, after the operation test is completed, the set value at the time of operation can be automatically set as the set value applied to the protective relay device.

It is a figure which shows an example of the whole structure of the protection relay device. It is a figure which shows an example of the setting data at the time of an operation and an operation test. It is a flowchart which shows an example of the setting process of a set value. It is a figure for demonstrating the flow of change of the settling data. It is a figure which shows the screen example for restoring a set value. It is a figure which shows the other screen example for restoring a set value. It is a block diagram which shows an example of the functional structure of the protection relay device.

Hereinafter, the present embodiment will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, the detailed description of them will not be repeated.

<Overall configuration>
FIG. 1 is a diagram showing an example of the overall configuration of the protective relay device 100. With reference to FIG. 1, the protective relay device 100 is a digital type protective relay device, and is installed inside, for example, an electric station. In the present embodiment, the protective relay device 100 collects, for example, data on the amount of electricity (for example, current, voltage, etc.) related to the transmission line L constituting the power system, and power is generated based on the amount of electricity data. Protect the grid (eg, transmission line L).

Inside the electric station, a protective relay device 100, an instrument transformer 2, an instrument transformer 4, a circuit breaker 6, and the like are installed. The instrument transformer 2 measures the current flowing through the transmission line L. The voltage transformer 4 measures the voltage generated in the transmission line L. The current data measured by the instrument transformer 2 and the voltage data measured by the instrument transformer 4 are input to the protection relay device 100.

The protection relay device 100 executes a relay operation necessary for protecting the power system using the collected electric energy data, and determines whether or not a system accident has occurred. When the protection relay device 100 detects an accident on the transmission line L, it outputs an open command (for example, a trip signal) to the circuit breaker 6. If only one of the current and the voltage is used for the relay calculation, the protection relay device 100 may be configured to take in the current or the voltage required for the relay calculation.

Specifically, the protection relay device 100 includes an auxiliary transformer 10, an AD (Analog to Digital) conversion unit 20, and an arithmetic processing unit 30 as a hardware configuration.

The auxiliary transformer 10 takes in the amount of electricity from the instrument transformer 2 and the instrument transformer 4, converts it into a voltage signal suitable for signal processing in the internal circuit, and outputs it. During the operation test, the connection between the instrument transformer 2 and the instrument transformer 4 and the protective relay device 100 is cut off, and instead, the protective relay device 100 and the test device 110 are connected. Will be done. In this case, the auxiliary transformer 10 takes in the amount of electricity (for example, current and voltage) input from the test device 110, converts it into a voltage signal, and outputs it.

The AD conversion unit 20 takes in the amount of electricity (that is, the amount of analog electricity) output from the auxiliary transformer 10 and converts it into digital data. Specifically, the AD conversion unit 20 includes filters 21, 23, sample hold circuits (corresponding to the SH circuit in the figure) 24, 25, a multiplexer 26, and an AD converter 27.

The filters 21 and 23 are analog filters, and remove high-frequency noise components from the current and voltage waveform signals output from the auxiliary transformer 10. The outputs of the filters 21 and 23 are input to the sample hold circuits 24 and 25, respectively.

The sample hold circuits 24 and 25 sample the current and voltage waveform signals output from the filters 21 and 23, respectively, at predetermined sampling cycles. The multiplexer 26 sequentially switches the waveform signals input from the sample hold circuits 24 and 25 in chronological order based on the timing signal input from the arithmetic processing unit 30, and inputs the waveform signals to the AD converter 27.

The AD converter 27 converts the waveform signal input from the multiplexer 26 from analog data to digital data. The AD converter 27 outputs the digitally converted waveform signal to the arithmetic processing unit 30.

The arithmetic processing unit 30 is mainly composed of a microcomputer. Specifically, the arithmetic processing unit 30 includes a CPU (Central Processing Unit) 32, a ROM (Read Only Memory) 33, a RAM 34, an auxiliary storage device 35, a DO (Digital output) circuit 36, and a DI (Digital). It includes an input) circuit 37, a display 38, and an input interface (IF) 39. These are connected by a bus 31.

The CPU 32 controls the protective relay device 100 by reading and executing a program stored in the ROM 33 in advance. The RAM 34 as the volatile memory and the ROM 33 as the non-volatile memory are used as the main memory of the CPU 32. The ROM 33 stores programs, setting values for signal processing, and the like.

Specifically, the CPU 32 takes in digital data from the AD conversion unit 20 via the bus 31. The CPU 32 executes a relay operation using the captured digital data according to the program stored in the ROM 33. Based on the relay calculation result, the CPU 32 determines whether or not there is an accident in the protected section (that is, the area to be protected).

When the CPU 32 detects an accident (for example, when the current value exceeds the set value), the CPU 32 is a circuit breaker installed in the power system to disconnect the accident section from the power system via the DO circuit 36. An open command is output to 6.

The auxiliary storage device 35 is a storage device having a larger capacity than the ROM 33, and stores data such as a program, an electric energy detection value, and a settling value. The auxiliary storage device 35 is composed of, for example, a hard disk, a flash memory, or the like. For example, the auxiliary storage device 35 stores various data at the time of operation for monitoring the power system (hereinafter, also simply referred to as “operation time”) and various data at the time of the operation test of the protection relay device 100.

The DI circuit 37 receives, for example, a digital input signal which is a signal indicating open / close information of the circuit breaker 6. In addition to the digital input signal from the circuit breaker 6, a digital input signal indicating opening / closing information of a disconnector (not shown) may be input to the DI circuit 37.

The display 38 is, for example, a liquid crystal display or the like. The input interface 39 is typically various buttons or the like, and receives various operations from a user (for example, a system operator).

In addition, at least a part of the protection relay device 100 may be configured by using a circuit such as FPGA (Field Programmable Gate Array) and ASIC (Application Specific Integrated Circuit). It should be noted that at least a part of the protective relay device 100 can also be configured by an analog circuit.

Further, the protective relay device 100 may be configured to be connected to a personal computer. In this case, the display of the personal computer functions as the display 38, and the keyboard, mouse, etc. of the personal computer function as the input interface 39. In the case of this configuration, the protective relay device 100 typically has a simple display device (for example, a fluorescent display tube, a 7-segment LED (light emitting diode), an indicator lamp such as a lamp).

The test device 110 is a device used at the time of an operation test of the protective relay device 100, and gives an input simulating an electric energy (for example, current, voltage) at the time of a system accident to the protected relay device 100. During the operation test of the protective relay device 100, the operator opens the circuit breaker 6 in order to disconnect the protective relay device 100 from the power system. As a result, the supply of electric power from the power supply side to the load side is cut off, so that the electric power system (for example, the transmission line L) to be protected by the protective relay device 100 is in a power failure state.

After the power system is put into a power failure state, an external test device is attached to the terminal provided in the protective relay device 100 (for example, the terminal used to take in the amount of electricity from the instrument transformer 2 and the instrument transformer 4). The 110 is connected, and the amount of electricity for testing (for example, voltage or current) is input from the test device 110 to the protective relay device 100. When the protective relay device 100 is mounted on the board, the external test device 110 may be connected to the test terminal mounted on the front surface of the board. For example, the amount of electricity for the test is input to the auxiliary transformer 10.

The power supply device 120 is a device for supplying electric power to the protective relay device 100. Typically, during operation, power from the power system (for example, transmission line L) is stepped down via a transformer and supplied to the power supply device 120 to supply power to the protective relay device 100. .. As a measure against a temporary power failure, a battery may be provided between the transformer and the power supply device 120. On the other hand, during the operation test, the power system is completely in a power failure state, so that power is supplied to the power supply device 120 from the external power supply 130 (for example, a generator) to supply power to the protection relay device 100. ..

<Settling data>
FIG. 2 is a diagram showing an example of settling data during operation and operation test. FIG. 2A shows the settling data 210 at the time of operation, and FIG. 2B shows the settling data 220 at the time of the operation test. For example, the settling data 210 is stored in the operating data storage area of the auxiliary storage device 35, and the settling data 220 is stored in the test data storage area of the auxiliary storage device 35.

The settling data 210 and 220 include a plurality of settling values corresponding to the plurality of settling items. Specifically, the settling data 210 and 220 include the operating value and operating time of the overcurrent relay element (corresponding to the “overcurrent element” in the figure) and the overvoltage relay element (“overvoltage element” in the figure) as the setting items. ”) And the operating value and operating time of the undervoltage relay element (corresponding to the“ undervoltage element ”in the figure). Corresponding set values are set for each set item. For example, the operating value of the overcurrent relay element and the setting value of the operating time included in the settling data 210 during operation are "10.0A" and "0.10s", respectively. On the other hand, the operating value and the setting value of the operating time of the overcurrent relay element included in the setting data 220 at the time of the operation test are "0.5A" and "0.01s", respectively. As described above, the set value at the time of the operation test is often set to a value smaller than the set value at the time of operation.

There are two main reasons, and the first reason is the limitation due to the output performance of the test equipment. Specifically, since the test device is used only during the operation test, portability and economy are required. Therefore, typically, since the test device is designed to be small and have a low output, it may not be possible to output a voltage and current equivalent to the input electric energy at the time of a system accident. In this case, it is necessary to change the set value to a smaller value and perform an operation test.

The second reason is to confirm the accuracy of the protective relay device. Specifically, as described with reference to FIG. 1, the voltage and current input to the protective relay device are converted into discrete values (that is, digital data) by the AD converter. The resolution of the discrete value is proportional to the value obtained by dividing the full scale (that is, the maximum voltage and current recognizable by the protective relay device) by the number of bits of the AD converter. Typically, since the resolution is uniform in the entire region from no input to full scale, the smaller the voltage and current inputs, the larger the error at the time of AD conversion due to the resolution. Therefore, assuming the case where the error of the protective relay device is the largest at the time of the operation test, the settling value is set near the minimum value in the settable range, and the operation accuracy at the settling value is confirmed. As a result, the operation test is performed under the strictest conditions.

In addition, even in the case of setting other than the numerical value (that is, the setting value), the operation test may be performed under the setting conditions different from those at the time of operation. For example, when the contact output of the protection relay device is performed under the AND condition of the two protection relay elements during operation, the AND condition of the logic unit is set in order to separate and test the two protection relay elements during the operation test. It may be canceled.

<Set value setting process>
As described above, the set value at the time of operation test and the set value at the time of operation are often different. Therefore, after the operation test is completed, it is necessary to return the settling value applied to the protective relay device from the settling value at the time of the test to the settling value at the time of operation. This is because if the operation is restarted with the set value at the time of the operation test set as the set value applied to the protective relay device, depending on the state of the input electric energy, even though no accident has occurred in the power system. However, there is a possibility that the protective relay device will operate and the power system will lose power. Alternatively, even though an accident has occurred in the power system, the protective relay device may not operate, causing the equipment on the power system to burn out and the accident to spread.

Therefore, in the present embodiment, a configuration for automatically setting the set value at the time of operation after the operation test is completed will be described. FIG. 3 is a flowchart showing an example of the setting process of the settling value.

With reference to FIG. 3, the CPU 32 determines whether or not to start the operation test of the protective relay device 100 (step S10). Specifically, the CPU 32 starts the operation test when it receives an operation test start instruction from the user via the input interface 39.

If the operation test is not started (NO in step S10), the CPU 32 executes the process of step S10. When the operation test is started (YES in step S10), the CPU 32 sets the settling data at the time of the operation test as the settling data used for the relay calculation (that is, applied to the protective relay device 100) (step). S12). Specifically, the CPU 32 reads the settling data (for example, settling data 220) at the time of the operation test from the internal memory (for example, the auxiliary storage device 35), and uses the settling data at the time of the operation test for the relay calculation. Set as settling data including settling values. The CPU 32 may newly generate the settling data at the time of the operation test instead of the settling data 220 according to the instruction from the user. In this case, the CPU 32 may store the generated settling data in the test data storage area of the auxiliary storage device 35 as new settling data 220 at the time of the operation test.

The CPU 32 determines whether or not to end the operation test (step S14). Specifically, the CPU 32 ends the operation test when the end flag of the operation test is set to "on", and ends the operation test when the end flag of the operation test is set to "off". Continue the operation test (that is, do not finish the operation test). When continuing the operation test (NO in step S14), the CPU 32 determines whether or not a reference time (for example, 12 hours) or more has elapsed since the operation test started (step S16). The reference time may be arbitrarily set by the user, or may be a predetermined fixed value.

If the reference time or more has not elapsed (NO in step S16), the CPU 32 executes the process of step S14. When the reference time or more has elapsed (YES in step S16), the CPU 32 sets the end flag of the operation test to "on" (step S18), and executes the process of step S14.

When the end flag of the operation test is set to "on" in step S18, the CPU 32 determines that the operation test is ended in step S14 (YES in step S14). In this case, the CPU 32 sets the settling data at the time of operation as the settling data used for the relay calculation (step S20). Specifically, the CPU 32 reads the settling data during operation (for example, settling data 210) from the internal memory, and sets the settling data at the time of operation as settling data including each settling value used for the relay calculation. ..

According to the above, when the operation test is started, the settling data 220 is set as the settling data for the relay calculation, and when the operation test is completed, the settling data 210 at the time of operation is set as the settling data for the relay calculation. It is set automatically. Therefore, it is possible to avoid a situation in which the settling data 220 at the time of the operation test is applied to the protective relay device 100 even though the operation test is completed.

In the flowchart of FIG. 3, the configuration in which the operation test ends after the reference elapses after the operation test starts has been described, but the configuration is not limited to this. For example, if there is an operation of cutting off the power supply from the external power supply 130 to the protective relay device 100 during the operation test, the operation test ends.

The reason is as follows. During normal operation, the protective relay device 100 is installed in the panel and is connected to an input side device such as an instrument transformer 2 and an instrument transformer 4, and an output side device such as a circuit breaker 6. During the operation test of the protective relay device 100, in order to eliminate the influence of the input side equipment and prevent the occurrence of malfunction of the output side equipment and the occurrence of electric shock accident of the worker due to live-line work, the in-panel circuit is cut off and input. Disconnect the side equipment and output side equipment from the protective relay device. At this time, since the power supplied from the power system to the protective relay device 100 also loses power, the power is supplied from the external power supply 130 separately prepared during the operation test. After the operation test is completed, in order to return the power supply circuit to the state before the operation test, it is necessary to turn off the power of the external power supply 130 again (that is, cut off the power from the external power supply 130). Therefore, if the power supply from the external power supply 130 is cut off during the operation test, it is considered that the operation test is completed.

Then, after the power supply to the protective relay device 100 is restarted and the protective relay device 100 is restarted, the CPU 32 executes the process of step S20 (that is, the settling data at the time of operation is used for the relay calculation. Set as settling data).

Further, when the CPU 32 receives an instruction to end the operation test from the user during the operation test via the input interface 39, the CPU 32 may determine that the operation test has been completed and execute the process of step S20.

<Change of set value during operation>
If some inconvenience occurs after the user changes the settling value included in the settling data during operation and you want to return to the settling value before the change, if there is no document that records the past settling value, the original It can be difficult to return to. Therefore, in the present embodiment, a configuration for storing the settling data at the time of operation in association with the time information will be described.

FIG. 4 is a diagram for explaining the flow of changing the settling data. With reference to FIG. 4, the settling data 310 during operation is a period from 12:00 on January 1, 2020 to 11:59 on February 1, 2020 (hereinafter, also referred to as “applicable period P1”). ), The settling data applied to the protective relay device 100. The settling data 320 during operation is a protective relay device during the period from 12:00 on February 1, 2020 to 11:59 on March 1, 2020 (hereinafter, also referred to as “applicable period P2”). It is the settling data applied to 100. The settling data 330 during operation is the settling data applied to the protective relay device 100 during the period from 12:00 on March 1, 2020 to the present (hereinafter, also referred to as "applicable period P3"). be.

The flow in which the settling data 310 to 330 are stored will be described. Here, the setting data 310 will be described from the state in which it is stored in advance in the internal memory (for example, the auxiliary storage device 35). Since new equipment (for example, a motor for a belt conveyor) was additionally introduced in the power system and the power consumption (current) increased, the user was able to use the overcurrent relay element of the settling data 310 at 12:00 on February 1, 2020. The operation value "10.0A" was changed to the operation value "20.0A". In response to the change, the settling data 310 before the change is stored in association with the application period P1, and the settling data 320 is stored as new settling data after 12:00 on February 1, 2020.

Subsequently, since the current consumption of the added equipment is larger than expected, the user sets the operating value "20.0A" of the overcurrent relay element of the settling data 320 at 12:00 on March 1, 2020. A change operation was performed to increase to "25.0A". In addition, since the amount of heat generated per unit time increases due to the large current, a change operation is performed to shorten the operating time "0.10 s" of the overcurrent relay element of the settling data 320 to "0.05 s" in the event of an accident. I tried to prevent the equipment from burning. In response to the change, the settling data 320 before the change is stored in association with the application period P2, and the settling data 330 is stored as new settling data after 12:00 on March 1, 2020.

In this way, each of the settling data before and after the change is stored in association with time information (for example, application periods P1 to P3) indicating the period during which the settling data is applied to the protective relay device 100. As a result, the user can refer to the past settling value when he / she wants to return (that is, restore) the settling value before the change after changing the settling value.

FIG. 5 is a diagram showing a screen example for restoring the settling value. With reference to FIG. 5, when the CPU 32 receives the restoration instruction of the set value via the input interface 39, the screen 510 is displayed on the display 38. The screen 510 includes a settling data selection area 512 in each of the application periods P1 to P3. For example, when the user selects the application period P2, the CPU 32 displays the screen 520 on the display 38. The screen 520 includes a display area 514 including the settling data 320 during the application period P2, a restore button 516, and a back button 518.

The user selects "operating value of the overcurrent relay element" and "operating time of the overcurrent relay element" as the settling items to be restored, and presses the restoration button 516. In this case, the set value of the set item "operating value of the overcurrent relay element" of the current set data 330 is changed to 20.0 A, and the set value of the set item "operating time of the overcurrent relay element" of the set data 330 is changed. It is changed to 0.10s. In this way, the user selects the settling item to be restored (for example, the operating value of the overcurrent relay element) to select the settling value (for example, 25.0A) corresponding to the settling item currently in operation. , It can be restored to the settling value (for example, 20.0A) corresponding to the settling item in the past period (for example, application period P2). The settling data 330 before the change and the new settling data after the change are stored in association with the time information at the time of the change.

FIG. 6 is a diagram showing another screen example for restoring the settling value. The screen 530 shown in FIG. 6 is displayed instead of the screen 520 when the user selects the application period P2 on the screen 510 of FIG. The screen 530 differs from the screen 520 in that the "current set value" is further displayed in the display area 532. In the case of the screen 530, the user can easily grasp the difference between the set value of the set data 320 in the application period P2 and the current set value, so that the restoration work can be performed more quickly.

In the above, the application period has been illustrated and described as the time information associated with the settling data, but the configuration is not limited to this. For example, the application start time of the settling data to the protective relay device 100 may be used as time information. In this case, the settling data 310 is associated with the application start time "12:00 on January 1, 2020", and the settling data 320 is associated with the application start time "12:00 on February 1, 2020". The data 330 is associated with the application start time "12:00 on March 1, 2020".

Further, the end time of application of the settling data to the protective relay device 100 may be used as time information. In this case, the settling data 310 is associated with the application end time "11:59 on February 1, 2020", and the settling data 320 is associated with the application end time "11:59 on March 1, 2020". The settling data 330 is associated with information indicating that it is currently being applied.

<Functional configuration>
FIG. 7 is a block diagram showing an example of the functional configuration of the protective relay device 100. With reference to FIG. 7, the protection relay device 100 includes an electric energy input unit 402, a relay calculation unit 404, a test execution unit 406, a settling data setting unit 408, a settling data changing unit 410, and a display control unit. Includes 412 and. Typically, these functions are realized by a processing circuit. The processing circuit may be dedicated hardware or may be a CPU 32 that executes a program stored in the ROM 33 of the arithmetic processing unit 30 of FIG. When the processing circuit is dedicated hardware, the processing circuit is composed of, for example, FPGA, ASIC, or a combination thereof. The protective relay device 100 further includes, for example, a storage unit 414 realized by the auxiliary storage device 35.

The electric energy input unit 402 receives input of current and voltage data (that is, electric energy data) via the AD converter 27. In normal operation, the electricity amount data is input by the instrument transformer 2 and the instrument transformer 4 provided in the power system (for example, the transmission line L). At the time of the operation test, the electric quantity data is input from the test apparatus 110.

The relay calculation unit 404 performs a relay calculation based on the electric energy data and the settling data. Specifically, the relay calculation unit 404 performs a relay calculation using electric quantity data input from an external device (for example, an instrument transformer 2, an instrument transformer 4, and a test device 110). Specifically, the relay calculation unit 404 performs calculations such as digital filtering and calculation of the effective value on the electric quantity data, compares the calculation result with the settling data, and operates the protected relay device 100. Is determined. When the relay calculation unit 404 determines that the protection relay device 100 is to be operated, the relay calculation unit 404 gives the operation determination result to the DO circuit 36, and outputs an open signal (for example, a trip signal) from the DO circuit 36 to the circuit breaker 6. ..

The test execution unit 406 starts or ends the operation test of the protective relay device 100 based on predetermined conditions. Typically, the test execution unit 406 starts the operation test of the protective relay device 100 when it receives an instruction input for starting the operation test from the user. In this case, for example, the control mode of the protective relay device 100 shifts from the operation mode to the test mode. The test execution unit 406 may output a notification of the start of the operation test to the settling data setting unit 408.

In a certain aspect, the test execution unit 406 ends the operation test when the reference time or more has elapsed from the start of the operation test. In this case, for example, the control mode of the protective relay device 100 shifts from the test mode to the operation mode. In another aspect, when the test execution unit 406 receives an instruction input from the user to end the operation test, the test execution unit 406 ends the operation test of the protective relay device 100. The test execution unit 406 may output a notification of the end of the operation test to the settling data setting unit 408.

In yet another aspect, if the power supply to the protective relay device 100 is cut off during the operation test, the test mode is considered to have ended. Therefore, when the power supply to the protected relay device 100 is restarted and the protected relay device 100 is restarted, the control mode of the protected relay device 100 becomes the operation mode.

The settling data setting unit 408 sets the settling data applied to the protective relay device 100 (that is, used for the relay calculation). Specifically, the settling data setting unit 408 setstles at the time of the operation test when the operation test of the protective relay device 100 is started (for example, when the operation test start notification is received from the test execution unit 406). The data (for example, the settling data 220) is set as the settling data used for the relay calculation in the relay calculation unit 404. As a result, the relay calculation unit 404 executes the relay calculation using the settling data 220 for the test at the time of the operation test.

On the other hand, the settling data setting unit 408 cuts off the power supply to the protective relay device 100 based on the completion of the operation test (for example, when the notification of the end of the operation test is received from the test execution unit 406). Case), the settling data used for the relay calculation is changed from the settling data at the time of the operation test to the settling data at the time of operation (for example, the settling data 210).

The storage unit 414 includes an operation data storage area 451 and a test data storage area 452. Various data (for example, settling data 210, etc.) used during operation are stored in the operation data storage area 451. Various data (for example, settling data 220 and the like) used in the operation test are stored in the test data storage area 452.

The settling data changing unit 410 changes the settling data (for example, the settling data 210 at the time of operation) according to the operation instruction from the user. Specifically, the settling data changing unit 410 setstles at least one of the settling values included in the settling data currently in operation (for example, settling data 210) (for example, the settling value of the operating value of the overcurrent relay element). ) Is changed, the settling data after the change is stored in the operation data storage area 451 of the storage unit 414 in association with the time information at the time of the change.

As a result, the settling data associated with the time information at the time of change is sequentially stored in the operation data storage area 451. For example, the settling data 310 in FIG. 4 is stored in association with the time information at the time of change (for example, 12:00 on January 1, 2020), and the settling data 320 is the time information at the time of change (for example, 2020). It is stored in association with 12:00 on February 1, 2020), and the settling data 330 is stored in association with the time information at the time of change (for example, 12:00 on March 1, 2020). Therefore, the CPU 32 can easily determine the period during which each settling data is applied to the relay calculation.

The display control unit 412 displays the screens 510, 520 shown in FIG. 5, the screen 530 shown in FIG. 6, and the like on the display 38. Specifically, the display control unit 412 has the application period P1 of the first area (for example, the selection area 512) representing the settling data (for example, the settling data 310) during operation in the first period (for example, the application period P1). Area) and a second area (for example, the area of the application period P2 of the selection area 512) representing the settling data (for example, the settling data 320) during operation in the second period (for example, the application period P2). (For example, screen 510) is displayed. Further, when the second area is selected by the user, the display control unit 412 displays each settling value included in the settling data at the time of operation in the second period on the display 38 (for example, the screen 520 or the screen 530 is displayed). do.

The settling item (for example, the operating value of the overcurrent relay element) corresponding to the settling value X (for example, 20.0 A) among the settling values included in the settling data during operation in the second period displayed on the display 38. ) Is selected by the user as the restoration target, the settling data changing unit 410 restores the settling value (for example, 25.0A) corresponding to the settling item currently in operation to the settling value X in the second period. ..

<Advantage>
According to this embodiment, after the operation test is completed, the settling data applied to the protective relay device 100 is automatically set from the settling data at the time of the operation test to the settling data at the time of operation. Therefore, it is possible to avoid a situation in which the set value for the operation test by the user is used during operation. In addition, the settling data at the time of operation is stored in the internal memory in association with the time information at the time of the change. Therefore, the user does not need to store the settling data before the change, and does not need to separately record the settling data on an external recording medium or the like.

Other embodiments.
The configuration exemplified as the above-described embodiment is an example of the configuration of the present embodiment, and can be combined with another known technique, and a part thereof is omitted to the extent that the gist of the present disclosure is not deviated. It is also possible to change and configure it.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims, not the description described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

2 Instrument transformer, 4 Instrument transformer, 6 Breaker, 10 Auxiliary transformer, 20 AD converter, 21,23 filter, 24,25 sample hold circuit, 26 multiplexer, 27 AD converter, 30 Arithmetic processing Unit, 31 bus, 32 CPU, 33 ROM, 34 RAM, 35 auxiliary storage device, 36 DO circuit, 37 DI circuit, 38 display, 39 input interface, 100 protection transformer, 110 test device, 120 power supply device, 130 external Power supply, 402 electricity amount input unit, 404 relay calculation unit, 406 test execution unit, 408 settling data setting unit, 410 settling data change unit, 412 display control unit, 414 storage unit, 451 operation data storage area, 452 test data Storage area, L transmission line.

Claims (6)

A protective relay device to protect the power system,
A relay calculation unit that performs relay calculation based on electric energy data and settling data,
It is equipped with a setting unit for setting the settling data.
The setting unit is
When the operation test of the protection relay device is started, the first settling data at the time of the operation test is set as the settling data used for the relay calculation.
Based on the completion of the operation test, the settling data used for the relay calculation is changed from the first settling data to the second settling data during operation for monitoring the power system, protection. Relay device. The protective relay device according to claim 1, wherein the operation test ends when a reference time or more has elapsed from the start of the operation test. The protected power transfer device according to claim 1 or 2, wherein the operation test ends when the power supply to the protected power transfer device is cut off during the operation test. The settling data includes a plurality of settling values corresponding to a plurality of settling items, respectively.
Further provided with a change unit for changing the settling data according to an operation instruction from the user.
When the change unit changes at least one of the set values included in the second settling data currently in operation, the changed part associates the changed second settling data with the time information at the time of the change. The protective relay device according to any one of claims 1 to 3, which is stored in a memory. A display control unit for displaying a display screen including a first area representing the second settling data in the first period and a second area representing the second settling data in the second period is further provided.
The protective relay according to claim 4, wherein when the second area is selected by the user, the display control unit displays each settling value included in the second settling data in the second period on the display. Device. When the settling item corresponding to the first settling value among the settling values included in the second settling data in the second period is selected by the user as the restoration target, the changing unit is currently in operation. The protective relay device according to claim 5, wherein the settling value corresponding to the item is restored to the first settling value in the second period.

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