JP2001258147A - Digital protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct apparatus test nearer to actual plant operation. SOLUTION: A test data recording part 15 is provided to store the digital data on electricity quantity of all digitalized plant operating patterns (accident data, normal operation data, plant starting data, plant stopping data, etc.), and the data required by a test data selection signal 16 is selected from these data and is outputted to a relay part 11 for testing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital protection relay device which outputs a trip command when a failure occurs in a power system or a power system installed in an electric substation so as to isolate a failed portion from the system.

[0002]

2. Description of the Related Art In general, a protection relay device inputs electric quantities from instrument transformers VT and CT installed in an electric power system, performs a relay process, and outputs a processing result to the outside of the device. FIG. 7 is a diagram showing the configuration of a conventional general digital protection relay device. In FIG. 1, reference numeral 1 denotes a digital protection relay device. The digital protection relay device 1 includes an input conversion unit 10, a relay unit 11, a sequence processing unit 12, an output unit 13, and the like. In addition, 2 is an instrument transformer and 3 is an AC input tester.

In the case of this digital protection relay device 1,
Usually, an input transformer 1 is connected to an instrument transformer 2 of a certain power system.
The electric quantity input to 0 is converted by the input converter 10 from an analog signal to a digital signal. The digitally converted electric quantity is detected by a relay unit 11 composed of a plurality of relay elements as to whether or not the electric quantity satisfies a predetermined range, and the result is transmitted to a sequence processing unit 12. In the sequence processing unit 12, the relay unit 11
Based on the determination of, the result is output to the output unit 13 as a signal,
The trip signal 141 is output to the outside of the device.

In order to perform a relay test of the digital protection relay device 1, an electric quantity assumed in every operation case from the instrument transformer 2 by the AC input tester 3 is simulated in a stage preceding the input converter 10. Normally, the soundness of the digital protection relay device 1 is confirmed by inputting and confirming the operation of the device.

Usually, a plurality of electric quantities are input to the digital protection relay device 1, that is, there are a plurality of instrument transformers 2, and the plurality of electric quantities are input to the input converter 10. Therefore, if it is possible to test by inputting an electric quantity to all of the input converters for all inputs of a plurality of instrument transformers at the same time, a test closer to an actual plant is possible, and the reliability of the apparatus is further improved.

However, it is difficult to simultaneously input electric quantities to all the input converters due to the limitations of the test apparatus. Therefore, the input converter 1 for each input of the transformer 2 for each instrument is difficult.
Actually, a relay device test is performed by inputting an electric quantity using the AC input tester 3 from the stage preceding the zero.

[0007]

The above-mentioned conventional apparatus cannot carry out a test in accordance with the operation mode of the actual plant, for example, a simulation test for increasing or decreasing the load when starting or stopping the power plant. In addition, the AC input tester 3
Has to be used to input the quantity of electricity, so that the test efficiency is not improved. Further, there is a concern that the input converter 10 and other devices may be destroyed due to an excessively erroneous input from the AC circuit tester 3.

Further, since the digital protection relay device normally applies the output from the input converter 10 to a plurality of relay elements, when a test input from the AC input tester 3 to the input converter 10 is performed, a plurality of relays are required. , The output of the trip signal 141 was always confirmed only from the relay having the highest detection speed. Therefore, it has been difficult to confirm that the trip signal 141 is actually output by another relay element that operates following the relay element.

Normally, a digital protection relay device includes a plurality of input conversion units 1 which change the scale accuracy of an electric quantity taken from an input transformer 2 according to the purpose of monitoring a relay element.
It is divided and input to 0. For example, for a relay element for which the relay operation at the time when the system electric quantity is small must be monitored with high accuracy, the input conversion of the electric quantity in which the weight per bit of the digital quantity is set to a small value is performed.

Conversely, for a relay element for which the relay operation must be monitored at the time when the electric quantity is large, the input conversion of the electric quantity in which the weight per bit of the digital quantity is set to a large value is performed. . For this reason, for example, when testing a relay element that monitors a point in time when the amount of system electricity is large, there is a possibility that a relay that monitors a point in time when the amount of system electricity is small may operate first. It has been difficult to confirm whether or not the trip signal 141 is actually output by a relay operation for monitoring a point in time when the system electricity is large.

Usually, the digital protection relay device is
In many cases, one relay operation outputs a relay operation command to a plurality of output circuits. For example, there are a command to open a circuit breaker, a warning command to notify an electric worker of a relay operation, and a command to output a relay operation to a computer. For this reason, the circuit breaker must not be opened depending on the operating conditions of the plant, but there are still cases where it is desired to execute a computer output confirmation test. Conventionally, in order to accomplish this test, the internal wiring of the digital relay device and the peripheral equipment have been simulatedly modified to cope with the problem, so that the burden on testers has been increased.

Usually, the digital protection relay device is
Since relay operation commands are often output to multiple output circuits with one relay operation, interface tests with peripheral equipment (for example, confirming the opening of circuit breakers, confirming alarm displays,
At the time of a test such as confirmation of a computer output), the test staff had to be arranged at the installation location of each facility, which was a burden on the test staff.

Further, when verifying the operation factor when the relay is actually operated during the operation of the plant, it is virtually impossible to verify the device by reproducing the same accident because of the influence on the plant. For this reason, it took a long time to determine whether the relay really operated due to an accident or the malfunction of the device itself, which could hinder plant operation.

The present invention has been made in view of the above circumstances, and by enabling a device test closer to actual plant operation, the reliability of the protection relay device is improved, and
It is an object of the present invention to provide a digital protection relay device for improving the efficiency of a relay test.

[0015]

According to a first aspect of the present invention, there is provided a digital protection relay device comprising: an input converter for converting an electric quantity of a power system into digital data; A relay unit configured by a plurality of relay elements for detecting an accident by detecting a disconnection and outputting a signal indicating an abnormality; and a sequence processing unit for performing a logic sequence process based on the signal output from the relay unit. And a digital protection relay device comprising: an output unit that outputs a trip signal to equipment installed in a power system according to a relay operation command from the sequence processing unit. A test data storage means for simulating the amount of electricity, and a test data for selectively controlling required data from the test data storage means. With the data selection means. This enables a relay test closer to actual plant operation.

According to a second aspect of the present invention, in the digital protection relay device according to the first aspect, the test data storage unit is output from an input conversion unit in response to a relay operation command from the sequence processing unit. A function of automatically recording digital data to the test data storage means.

According to a third aspect of the present invention, there is provided a digital protection relay device, comprising: an input converter for converting an electric quantity of a power system into digital data; and detecting that a value of the digital data is out of a predetermined range. A relay unit configured by a plurality of relay elements that detects a fault and outputs a signal indicating an abnormality, a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit, and the sequence processing unit. An output unit that outputs a trip signal to equipment installed in the power system in response to a relay operation command from the digital protection relay device, wherein the plurality of relays are provided in a preceding stage of the sequence processing unit or in a preceding stage of the relay unit. A relay element selecting means for selecting a signal output of a required relay element from the elements is provided.

According to a fourth aspect of the present invention, there is provided a digital protection relay device, comprising: an input converter for converting an electric quantity of a power system into digital data; and detecting that the value of the digital data is out of a predetermined range. A relay unit configured by a plurality of relay elements for detecting a fault and outputting a signal indicating abnormality, a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit, and the sequence processing unit. A digital protection relay device comprising an output unit that outputs a trip signal to equipment installed in a power system in response to a relay operation command from a relay operation command, provided at a stage preceding the relay unit, and required from among the plurality of input electric quantities. Input electric quantity selection means for selecting an input electric quantity to be input.

According to a fifth aspect of the present invention, there is provided a digital protection relay device, comprising: an input converter for converting an electric quantity of a power system into digital data; and detecting that the value of the digital data is out of a predetermined range. A relay unit configured by a plurality of relay elements for detecting a fault and outputting a signal indicating abnormality, a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit, and the sequence processing unit. A digital protection relay device comprising: an output unit that outputs a trip signal to equipment installed in a power system in response to a relay operation command from a plurality of output circuits provided before or after the output unit. Output circuit selecting means for selecting a circuit to be used.

According to a sixth aspect of the present invention, there is provided a digital protection relay device, comprising: an input converter for converting an electric quantity of a power system into digital data; and detecting that a value of the digital data is out of a predetermined range. A relay unit configured by a plurality of relay elements for detecting a fault and outputting a signal indicating abnormality, a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit, and the sequence processing unit. A digital protection relay device comprising: an output unit that outputs a trip signal to equipment installed in a power system in response to a relay operation command from a plurality of simulated electric quantities in place of the digital electricity quantities output from the input conversion unit. A data storage unit provided before the sequence processing unit or before the relay unit, A relay element selecting means for selecting a required signal output of the relay element from the elements; and an input electricity provided before the relay unit and for selecting a required input electricity quantity from the plurality of input electricity quantities. An amount selection unit, an output circuit selection unit provided before or after the output unit, for selecting a required circuit from the plurality of output circuits, and an output circuit selection unit for controlling each of the units from a remote position. Test control selecting means.

[0021]

FIG. 1 is a block diagram showing an embodiment of a digital protection relay device according to claim 1 of the present invention. 1, the same functional portions as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, all digitized plant operation patterns are created in advance, and are selected according to necessity so as to be input to the protection relay device.

Therefore, the newly added configuration is a test data record that stores digital electric quantity data of all digitized plant operation patterns (accident data, normal operation data, plant startup data, plant shutdown data, etc.). A test data selection signal 16 for selecting required data from the electrical quantity data of the test data recording unit 15;
And a test data selection unit 17 for outputting the digital electric quantity data selected by the test data selection signal 16 to the relay unit 11.

Next, the operation will be described. Normally, the analog electric quantity taken from the input transformer 2 is input to the input converter 10.
The test data selection unit 17 determines that the operation mode is the normal operation mode (no command is issued from the test data selection signal 16), and the electric quantity data is passed to the relay unit 11.

Next, when the test data selection signal passes from the test data selection signal 16 to the test data selection unit 17, the input data line 10a from the input conversion unit 10 is cut off, and the test data selection signal 16 The test data selected by the user is passed to the relay unit 11 via the test data selection unit 17. One or more test data may be selected.

The recording time of each test data recorded in the test data recording section 15 can be set arbitrarily. The settable number and the settable time depend on the memory capacity of the test data recording section 15. Note that data recording in the test data recording unit 15 is realized by, for example, transferring test data by connecting a cable from a personal computer to a device, mounting a memory chip storing test data, and the like. According to the present embodiment, it is possible to perform a relay test closer to actual plant operation, so that it is possible to improve the reliability of the digital protection relay device and increase the efficiency of the relay test.

FIG. 2 is a block diagram showing another embodiment of the digital protection relay device according to claim 2 of the present invention. 2, the same functional portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, a reproducibility test is made possible by recording an event detected by the sequence processing unit during the operation of the plant in the test data recording unit.

For this purpose, the input conversion unit 1
The data buffer 21 for recording the past data for a certain time outputted from 0, and the trip data from the sequence processing unit to the output unit 13, and the test data recording unit 1
5, an automatic recording command signal 22 for storing as test data, and a test data recording unit 1 at a required timing.
5 is a manual recording command signal 23 for storing as test data.

Next, the operation will be described. Normally, the analog electric quantity taken from the input transformer 2 is input to the input converter 10.
The test data selection unit 17 determines that the operation mode is the normal operation mode (no command is issued from the test data selection signal 16), and the test data is passed to the relay unit 11.

Next, when the test data selection signal passes from the test data selection signal 16 to the data selection unit 17, the input conversion unit 1
The input data line 10a from 0 is cut off, and the test data selected by the test data selection signal 16 from the test data recording unit 15 is passed to the relay unit 11 via the test data selection unit 17. One or more test data may be selected.

The recording time of each test data recorded in the test data recording section 15 can be set arbitrarily. The settable number and the settable time depend on the memory capacity of the test data recording section 15. Further, when a trip is detected by the sequence processing unit 12 during the operation of the plant, the data in the data buffer 21 is stored in the test data recording unit 15 by the automatic recording command signal 22 as actual test data as one of the test data.

By outputting the manual recording command signal 23 at a necessary timing during the operation of the plant, the data of the data buffer 21 is stored in the test data recording unit 15 as the actual plant operation data as one of the test data. According to the present embodiment, it is possible to perform a relay test closer to the actual plant operation, and further to perform a reproduction test of the actual operation, thereby improving the reliability of the digital protection relay device, increasing the efficiency of the relay test, and further recovering from failure. Time savings can be achieved.

FIG. 3 is a block diagram showing an embodiment of a digital protection relay device according to claim 3 of the present invention.
3, the same functional portions as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, different relay element units are selected and operated for the same electric quantity input.

Therefore, the newly added one is a relay element selection signal 192 for selecting a required relay element from among the relay elements housed in the relay section 11.
And a relay selection unit 32 for controlling the relay element output selected from the relay unit 11 by the relay element selection signal 31 to be permitted or not permitted.

Next, the operation will be described. Normally, the analog electric quantity taken from the input transformer 2 is input to the input converter 10.
The relay selection unit 32 determines that the operation mode is the normal operation mode (there is no command from the relay element selection signal 31), and permits the output to all the relay elements.

When a selection signal is passed from the relay element selection signal 31 to the relay selection section 32, the relay element output selected by the relay element selection signal 31 from the relay section 11 is sent to the sequence processing section 12 via the relay selection section 32. Relay operation data is passed. In addition, a plurality of relay elements can be selectively cut off.

It is also possible to select each phase (R phase, S phase, T phase, N phase). The location of the relay selection unit 32 can be realized even if it is provided in a stage preceding the relay unit 11. According to the present embodiment, even when a plurality of relay elements having different operation detection speeds operate for the same electric quantity input, a trip operation can be confirmed in each relay element unit.
The reliability of the digital protection relay device and the efficiency of the relay test can be improved.

FIG. 4 is a block diagram showing an embodiment of a digital protection relay device according to claim 4 of the present invention.
In FIG. 4, the same functional portions as those in FIG. In the present embodiment, an electric quantity input from the same input converter is tested for each of a plurality of input conversion units having different scale accuracy.

Accordingly, the newly added one is an input electric quantity selection signal 41 for selecting a required input electric quantity from the input electric quantities stored in the input conversion section 10.
And an input electric quantity selection unit 42 for controlling the input electric quantity output selected by the input electric quantity selection signal 41 from the input conversion unit 10 to be permitted or not permitted.

Next, the operation will be described. Normally, the analog electric quantity taken from the input transformer 2 is input to the input converter 10.
The input electric quantity selection unit 42 determines that the operation mode is the normal operation mode (the command is not output from the input electric quantity selection signal 41), and the output is permitted for all the input electric quantities. .

When a selection signal is passed from the input electric quantity selection signal 41 to the input electric quantity selection section 42, the input electric quantity selected by the input electric quantity selection signal 41 from the input conversion section 10 is passed through the input electric quantity selection section 42. Thus, the electric quantity data is passed to the relay unit 11. Note that a plurality of input electric quantities can be selected.

According to the present embodiment, even when the electric quantity input from the same input transformer is applied to a plurality of input conversion units having different scale accuracy, it is possible to perform a test for each input conversion unit. Therefore, the reliability of the digital protection relay device can be improved and the efficiency of the relay test can be improved.

FIG. 5 is a block diagram showing an embodiment of a digital protection relay device according to claim 5 of the present invention.
5, the same functional portions as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, the same signal output is derived to a plurality of output circuits for different purposes.

Therefore, the newly added one is an output circuit selection signal 51 for selecting a required circuit from the output circuits housed in the output unit 13 and the output circuit selection signal 51 from the sequence processing unit 12. An output circuit selection unit 52 for permitting or disallowing the output from the selected circuit.

Next, the operation will be described. Normally, the analog electric quantity taken from the input transformer 2 is input to the input converter 10.
The output circuit selection unit 52 determines that the operation mode is the normal operation mode (no command is output from the output circuit selection unit 51), and permits output to all circuits.

When a selection signal is output from the output circuit selection signal 51 to the output circuit selection section 52, the circuit output selected by the output circuit selection signal 51 is output from the output section 13 to the outside of the digital protection relay device 1-5. -1 is output. Note that a plurality of output circuits can be selected. It should be noted that the output circuit selecting section 52 is disposed at the output section 13.
It can also be realized in the subsequent stage.

According to this embodiment, even when the same signal output is applied to a plurality of output circuits for different purposes, output permission or non-permission can be selected for each output circuit. Even when individual output lock is required, temporary wiring modification or the like is not required, so that the reliability of the digital protection relay device and the efficiency of the relay test can be improved.

FIG. 6 is a block diagram showing an embodiment of a digital protection relay device according to claim 6 of the present invention.
6, the same functional portions as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, each of the components described above is synthesized, and a test control selection signal 61 is newly added in the present embodiment.

Therefore, the functions of the individual components will be described. A test control selection signal 61 is provided at a location remote from the digital protection relay device 1-6 for convenience of testing. A test data selection unit that outputs the digitized electric quantity data selected from the data recording unit 15 by the test control selection signal 61 to the relay unit 11, and a relay element 32 selected by the test control selection signal 61 from the relay unit 11. A relay selector 42 for permitting or disallowing the output, and an input quantity selector 42 for permitting or disallowing the input quantity output selected by the test control selection signal 61 from the input converter 10. , 52 control the output from the circuit selected by the test control selection signal 61 from the sequence processing unit 12 to be enabled or disabled. An output circuit selecting unit because.

Next, the operation will be described by taking the output circuit selecting section as an example. Normally, the analog electric quantity taken in from the input transformer 2 is digitized by the input conversion unit 10 and the output circuit selection unit 52 determines that the operation mode is the normal operation mode (no command is issued from the test control selection signal 61). , Output is permitted for all circuits.

When a selection signal is transmitted from the test control selection signal 61 to the output circuit selection section 52, the circuit output selected by the output circuit selection signal from the output section 13 is output to the outside of the digital protection relay device 1-6 by a trip signal. 14-1 is output. It is to be noted that a plurality of output circuits for selectively cutting off are also possible. The location of the output circuit selection unit 52 can be realized even after the output unit 13.

According to the present embodiment, a relay test can be performed by remote control using only required test electric quantity data, required relay elements, required input electric quantities, and required output circuits. In addition, the efficiency of the relay test of the digital protection relay device can be improved.

[0052]

As described above, according to the present invention, a test is performed by introducing a plurality of simulated electric quantities instead of the digital electric quantities output from the input converter.
A relay test closer to actual plant operation is possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a digital protection relay device according to [claim 1] of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of a digital protection relay device according to [claim 2] of the present invention.

FIG. 3 is a configuration diagram showing an embodiment of a digital protection relay device according to claim 3 of the present invention.

FIG. 4 is a configuration diagram showing an embodiment of a digital protection relay device according to [claim 4] of the present invention.

FIG. 5 is a configuration diagram showing an embodiment of a digital protection relay device according to claim 5 of the present invention.

FIG. 6 is a configuration diagram showing an embodiment of a digital protection relay device according to claim 6 of the present invention.

FIG. 7 is a diagram illustrating a conventional digital protection relay device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digital protection relay apparatus 10 Input conversion part 11 Relay part 12 Sequence processing part 13 Output part 2 Instrument transformer 3 AC input tester 15 Test data recording part 16 Test data selection signal 17 Test data selection part 21 Data buffer 22 Automatic recording Command signal 23 Manual recording command signal 31 Relay element selection signal 32 Relay selection section 41 Input electric quantity selection signal 42 Input electric quantity selection section 51 Output circuit selection signal 52 Output circuit selection section 61 Test control selection signal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G036 AA27 BA07 CA01 CA06 5G042 FF03 FF04 FF05 FF08 FF26 5H209 AA20 BB13 CC03 EE01 GG04 HH04 HH22

Claims (6)

[Claims] An input converter for converting an amount of electricity of a power system into digital data; a plurality of input converters for detecting that the value of the digital data is out of a predetermined range, detecting an accident, and outputting a signal indicating abnormality; A relay unit configured by a relay element of, and a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit,
In a digital protection relay device comprising an output unit for outputting a trip signal to equipment installed in a power system according to a relay operation command from the sequence processing unit, a plurality of simulations in place of the digital electricity output from the input conversion unit A digital protection relay device comprising: a test data storage means for electric quantity; and test data selection means for selecting and controlling required data from the test data storage means. 2. The digital protection relay device according to claim 1, wherein said test data storage means stores digital data output from an input conversion section in response to a relay operation command from said sequence processing section. A digital protection relay device having an automatic recording function. 3. An input converter for converting an amount of electricity in a power system into digital data, a plurality of input converters for detecting that the value of the digital data is out of a predetermined range, detecting an accident, and outputting a signal indicating an abnormality. A relay unit configured by a relay element of, and a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit,
In a digital protection relay device comprising an output unit that outputs a trip signal to equipment installed in a power system according to a relay operation command from the sequence processing unit, provided in a preceding stage of the sequence processing unit or in a preceding stage of the relay unit, A digital protection relay device, comprising: relay element selecting means for selecting a signal output of a required relay element from the plurality of relay elements. 4. An input conversion unit for converting an amount of electricity of a power system into digital data, a plurality of input conversion units for detecting that a value of the digital data is out of a predetermined range, detecting an accident, and outputting a signal indicating an abnormality. A relay unit configured by a relay element of, and a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit,
In a digital protection relay device including an output unit that outputs a trip signal to equipment installed in a power system according to a relay operation command from the sequence processing unit, the digital protection relay device is provided in a preceding stage of the relay unit and includes a plurality of input electric quantities. A digital protection relay device comprising input electric quantity selection means for selecting a required input electric quantity from the inside. 5. An input converter for converting an electric quantity of a power system into digital data, a plurality of input converters for detecting that the value of the digital data is out of a predetermined range, detecting an accident, and outputting a signal indicating an abnormality. A relay unit configured by a relay element of, and a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit,
An output unit that outputs a trip signal to equipment installed in a power system in response to a relay operation command from the sequence processing unit, wherein the digital protection relay device is provided at a stage before or after the output unit, and the plurality of output circuits A digital protection relay device comprising an output circuit selecting means for selecting a required circuit from the following. 6. An input converter for converting an electric quantity of an electric power system into digital data, a plurality of input converters for detecting that a value of the digital data is out of a predetermined range, detecting an accident, and outputting a signal indicating an abnormality. A relay unit configured by a relay element of, and a sequence processing unit that performs a logic sequence process based on a signal output from the relay unit,
In a digital protection relay device comprising an output unit for outputting a trip signal to equipment installed in a power system according to a relay operation command from the sequence processing unit, a plurality of simulations in place of the digital electricity output from the input conversion unit Test data storage means of the electric quantity, provided before the sequence processing unit or before the relay unit,
Relay element selecting means for selecting a signal output of a required relay element from among the plurality of relay elements, and a required input electric quantity provided from the plurality of input electric quantities, which is provided in a preceding stage of the relay unit. Input electric quantity selection means to select,
Output circuit selecting means provided at a preceding stage or a succeeding stage of the output unit, for selecting a required circuit from among the plurality of output circuits, and test control selecting means provided for controlling each of the means from a remote position A digital protection relay device comprising: