A load simulation relay protection vector checking method

Abstract

The present invention relates to the field of power system detection technology, and specifically to a load simulation type relay protection vector inspection method, including: using a load simulation type relay protection vector inspection test method to conduct a vector inspection test of the reconstruction and expansion project before the relay protection is officially put into operation; the vector inspection of the reconstruction and expansion project includes a double bus line reconstruction and expansion protection vector inspection, a 3 / 2 bus line reconstruction and expansion protection vector inspection, a double bus transformer reconstruction and expansion protection vector inspection, a converter transformer reconstruction and expansion protection vector inspection, and an AC filter reconstruction and expansion protection vector inspection; the load simulation type relay protection vector inspection test method includes a current and voltage homologous application test and a current and voltage non-homologous application test. The present invention can effectively reduce the grid operation mode adjustment and switching operation caused by the actual load test of the relay protection equipment, reduce the grid safety risk during the startup and commissioning of new equipment, improve the startup work efficiency, and promote the quality and efficiency of the grid.

Description

Technical Field

[0001] The invention relates to the technical field of power system detection, and in particular to a load simulation type relay protection vector inspection method. Background Art

[0002] Relay protection is the first line of defense to ensure the safe and stable operation of the power grid. The correct relay protection vector is the basic condition to ensure the correct operation of the device. The equipment that directly produces and distributes electric energy in the power system is called primary equipment, such as generators, transmission lines, transformers, etc. The equipment that monitors, measures, controls and protects the primary equipment is called secondary equipment, such as protection relays, measuring instruments, etc. The power system relay protection vector test technology is mainly used to check the correctness of the relay protection vector before the power equipment is installed and put into operation. It is also used to check the correctness of the vector of secondary equipment such as measuring instruments, meters, control systems, etc. In the past, the renovation and expansion projects were supposed to complete the same power supply phase verification step by step through the zero-start voltage rise test on the low-voltage side of the main transformer for the whole station, complete the differential protection load verification through the bus differential protection zero-start current rise test and the main transformer differential protection zero-start current rise test, and complete the single-bay protection polarity verification by simultaneously conducting the current and voltage phase-locked test of the single-bay protection during the bus differential protection zero-start current rise test. However, this is not only labor-intensive and time-consuming, but if the vector is wrong, it will directly lead to false operation or refusal of relay protection, inaccurate measurement data, metering errors and other problems, which will directly affect the normal operation of power equipment.

[0003] Therefore, it is necessary to design a load simulation relay protection vector checking method. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a load simulation relay protection vector inspection method.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: a load simulation type relay protection vector inspection method, comprising:

[0006] Use load simulation relay protection vector inspection test method to carry out vector inspection test of the reconstruction and expansion project before the relay protection is officially put into operation;

[0007] The vector inspection of the reconstruction and expansion project includes double bus line reconstruction and expansion protection vector inspection, 3 / 2 bus line reconstruction and expansion protection vector inspection, double bus transformer reconstruction and expansion protection vector inspection, converter transformer reconstruction and expansion protection vector inspection, AC filter reconstruction and expansion protection vector inspection, and phase shifter reconstruction and expansion protection vector inspection;

[0008] The load simulation relay protection vector inspection test method includes a current and voltage homologous application test and a current and voltage non-homologous application test, and the double bus line reconstruction and expansion protection vector inspection, 3 / 2 bus line reconstruction and expansion protection vector inspection, double bus transformer reconstruction and expansion protection vector inspection, and phase shifter reconstruction and expansion protection vector inspection are respectively performed through the current and voltage homologous application test and the current and voltage non-homologous application test;

[0009] The double busbar line reconstruction and expansion protection vector inspection specifically includes:

[0010] The current and voltage homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0011] Step 101, applying a test voltage to the outgoing line side of the expansion and reconstruction line, connecting a test load to the ground switch on the bus side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct;

[0012] Step 102, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line, simulating a primary load current, and checking whether the line differential protection vector is correct;

[0013] Step 103 involves checking the busbar protection vector of the expansion line, and checks the busbar protection vector by combining busbar protection rotation stop with relevant branch information;

[0014] The current and voltage non-homologous source application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0015] Step 201, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0016] Step 202, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line backup protection vector is correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0017] Step 203, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct;

[0018] Step 204 involves checking the busbar protection vector of the line to be rebuilt or expanded, and the busbar protection vector is checked by combining busbar protection rotation with relevant branch information.

[0019] Furthermore, the 3 / 2 bus line reconstruction and expansion protection vector inspection specifically includes:

[0020] The current and voltage homologous application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including:

[0021] Step 301, applying a test voltage to the side switch of the expansion and reconstruction line, connecting a test load to the middle switch side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct;

[0022] Step 302, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line to simulate a primary load current and check whether the line differential protection vector is correct;

[0023] Step 303, involving bus protection of the expansion and reconstruction line, adjacent interval line in the same string or main transformer protection vector check, bus protection rotation stop mode combined with relevant branch information to perform bus protection vector check;

[0024] The current and voltage non-homologous application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including:

[0025] Step 401, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0026] Step 402, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line, circuit breaker backup protection vector and voltage core phase are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0027] Step 403, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct;

[0028] Step 404 involves a vector check of busbar protection of the expanded or rebuilt line, adjacent interval lines in the same string, or main transformer protection, and the busbar protection rotation stop method is used to perform the vector check.

[0029] Furthermore, the double busbar transformer reconstruction and expansion protection vector inspection specifically includes:

[0030] The current and voltage homogeneous application test is used to check the protection vector of the double bus transformer renovation and expansion, including:

[0031] Step 501, applying a test voltage to the medium voltage side of the transformer, closing the busbar grounding switch on the high voltage side of the transformer, simulating a primary load current to flow through the medium and high voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector on the medium and high side and the differential protection vector on the medium and high sides of the transformer protection device are correct;

[0032] Step 502, applying a test voltage to the medium voltage side of the transformer, connecting a ground wire to the low voltage side of the transformer, simulating a primary load current to flow through the medium and low voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector of the medium and low sides of the transformer protection device and the differential protection vector of the medium and low sides are correct;

[0033] Step 503, a transformer branch voltage phase checking method, and a double bus line reconstruction and expansion protection vector checking method;

[0034] Step 504 involves checking the bus protection vector of the transformer branch to be rebuilt and expanded, and the bus protection vector is checked by combining the bus protection rotation stop mode with the relevant branch information;

[0035] The current and voltage non-homologous source application test is used to check the protection vector of the double bus transformer renovation and expansion, including:

[0036] Step 601, verify whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0037] Step 602, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the backup protection vectors on each side of the main transformer protection device are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0038] Step 603, each side uses the system power supply as a reference, uses a test device to simulate the primary current flowing through the current transformers on each side of the main transformer, and checks whether the differential protection vector of the main transformer protection is correct;

[0039] Step 604 involves checking the busbar protection vector of the main transformer to be rebuilt or expanded, and the busbar protection vector is checked by combining busbar protection rotation with relevant branch information.

[0040] Furthermore, the converter transformation and expansion protection vector check specifically includes:

[0041] Step 701, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / Y converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / Y converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance;

[0042] Step 702, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / △ converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / △ converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance;

[0043] Step 703, use the test equipment to apply the test voltage on the incoming side switch side, and connect the test load on the middle switch side to simulate the primary load current flowing through the side switch and the middle switch, and check whether the relative polarity relationship and transformation ratio of the current loop of the side switch and the middle switch are correct.

[0044] Furthermore, the AC filter reconstruction and expansion protection vector inspection specifically includes:

[0045] Step 801, short-circuit the current transformers at the head and tail of the AC filter, apply a test source at the side switch, simulate the primary load current flowing through the large group AC filter incoming line and the small group AC filter current transformer, and check whether the relative polarity relationship and transformation ratio of the filter large group protection and small group protection current loops are correct;

[0046] Step 802, short-circuit the head and tail current transformers of other groups of AC filters in turn, and perform inspection according to step 801;

[0047] Step 803, use the test equipment to apply the test source on the incoming side switch side, and connect the test load on the middle switch side, to simulate the primary load current flowing through the side switch and the middle switch, and check whether the relative polarity relationship and transformation ratio of the current loop of the side switch and the middle switch are correct.

[0048] Furthermore, the phase regulator reconstruction and expansion protection vector inspection specifically includes:

[0049] The current and voltage homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including:

[0050] Connect the two ends of the phase regulator with a short-circuit line, apply a test source and a test load to both sides of the phase regulator from different sources, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase regulator are correct;

[0051] The current and voltage non-homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including:

[0052] Connect the two ends of the phase modulator with a short-circuit line, apply test sources and short circuits on both sides of the phase modulator with non-homologous sources, apply test voltage on the primary side of the phase modulator PT, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase modulator are correct.

[0053] It can be seen from the above description of the present invention that, compared with the prior art, the load simulation relay protection vector inspection method of the present invention includes at least one of the following beneficial effects:

[0054] 1. The present invention proposes a load simulation relay protection vector inspection method, which transmits the reference voltage wirelessly to control the current and voltage source to generate phase-controllable large current and high voltage, injects it into the primary side of the current transformer and the voltage transformer and simulates the actual load, detects the vector relationship of the entire primary and secondary circuits at one time, and ensures the phase consistency of all voltages and currents. The present invention solves the problem of relay protection vector test verification before the primary equipment is energized, and avoids a series of problems in conventional load vector test methods, such as multiple professional coordination, large switching operations, and high power grid safety risks;

[0055] 2. The present invention can effectively reduce the grid operation mode adjustment and switching operation caused by the actual load test of the relay protection equipment, reduce the grid safety risk during the startup and commissioning of new equipment, improve the startup work efficiency, and promote the quality and efficiency of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A test circuit diagram of a double bus line reconstruction and expansion protection vector check using a current and voltage homologous application test in an embodiment of the present invention;

[0057] Figure 2 The present invention is a test circuit diagram for checking the protection vector of a double bus line reconstruction and expansion by adopting a current and voltage non-homologous application test in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] A preferred embodiment of the present invention is a load simulation relay protection vector inspection method, comprising:

[0060] Use load simulation relay protection vector inspection test method to carry out vector inspection test of the reconstruction and expansion project before the relay protection is officially put into operation;

[0061] The vector inspection of the reconstruction and expansion project includes double bus line reconstruction and expansion protection vector inspection, 3 / 2 bus line reconstruction and expansion protection vector inspection, double bus transformer reconstruction and expansion protection vector inspection, converter transformer reconstruction and expansion protection vector inspection, AC filter reconstruction and expansion protection vector inspection, and phase shifter reconstruction and expansion protection vector inspection;

[0062] The load simulation relay protection vector inspection test method includes a current and voltage homologous application test and a current and voltage non-homologous application test, and the double bus line renovation and expansion protection vector inspection, 3 / 2 bus line renovation and expansion protection vector inspection, double bus transformer renovation and expansion protection vector inspection, and phase modulator renovation and expansion protection vector inspection are respectively performed through the current and voltage homologous application test and the current and voltage non-homologous application test.

[0063] The double busbar line reconstruction and expansion protection vector inspection specifically includes:

[0064] The current and voltage homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0065] Step 101, applying a test voltage to the outgoing line side of the expansion and reconstruction line, connecting a test load to the ground switch on the bus side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct;

[0066] Step 102, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line, simulating a primary load current, and checking whether the line differential protection vector is correct;

[0067] Step 103 involves checking the busbar protection vector of the expansion line, and checks the busbar protection vector by combining busbar protection rotation stop with relevant branch information;

[0068] The current and voltage non-homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0069] Step 201, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0070] Step 202, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line backup protection vector is correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0071] Step 203, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct;

[0072] Step 204 involves checking the busbar protection vector of the line to be rebuilt or expanded, and the busbar protection vector is checked by combining busbar protection rotation with relevant branch information.

[0073] As a preferred embodiment of the present invention, it may also have the following additional technical features:

[0074] Furthermore, the 3 / 2 bus line reconstruction and expansion protection vector inspection specifically includes:

[0075] The current and voltage homologous application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including:

[0076] Step 301, applying a test voltage to the side switch of the expansion and reconstruction line, connecting a test load to the middle switch side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct;

[0077] Step 302, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line to simulate a primary load current and check whether the line differential protection vector is correct;

[0078] Step 303, involving bus protection of the expansion and reconstruction line, adjacent interval lines in the same string or main transformer protection vector check, bus protection rotation stop mode combined with relevant branch information to perform bus protection vector check;

[0079] The current and voltage non-homologous source application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including:

[0080] Step 401, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0081] Step 402, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line, circuit breaker backup protection vector and voltage core phase are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0082] Step 403, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct;

[0083] Step 404 involves a vector check of busbar protection of the expanded or rebuilt line, adjacent interval lines in the same string, or main transformer protection, and the busbar protection rotation stop method is used to perform the vector check.

[0084] Furthermore, the double bus transformer reconstruction and expansion protection vector inspection specifically includes:

[0085] The current and voltage homogeneous application test is used to check the protection vector of the double bus transformer renovation and expansion, including:

[0086] Step 501, applying a test voltage to the medium voltage side of the transformer, closing the busbar grounding switch on the high voltage side of the transformer, simulating a primary load current to flow through the medium and high voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector on the medium and high side and the differential protection vector on the medium and high sides of the transformer protection device are correct;

[0087] Step 502, applying a test voltage to the medium voltage side of the transformer, connecting a ground wire to the low voltage side of the transformer, simulating a primary load current to flow through the medium and low voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector of the medium and low sides of the transformer protection device and the differential protection vector of the medium and low sides are correct;

[0088] Step 503, a transformer branch voltage phase checking method, and a double bus line reconstruction and expansion protection vector checking method;

[0089] Step 504 involves checking the bus protection vector of the transformer branch to be rebuilt and expanded, and the bus protection vector is checked by combining the bus protection rotation stop mode with the relevant branch information;

[0090] The current and voltage non-homologous source application test is used to check the protection vector of the double bus transformer renovation and expansion, including:

[0091] Step 601, verify whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct;

[0092] Step 602, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the backup protection vectors on each side of the main transformer protection device are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply;

[0093] Step 603, each side uses the system power supply as a reference, uses a test device to simulate the primary current flowing through the current transformers on each side of the main transformer, and checks whether the differential protection vector of the main transformer protection is correct;

[0094] Step 604 involves checking the busbar protection vector of the main transformer to be rebuilt or expanded, and the busbar protection vector is checked by combining busbar protection rotation with relevant branch information.

[0095] Furthermore, the converter transformation and expansion protection vector check specifically includes:

[0096] Step 701, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / Y converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / Y converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance;

[0097] Step 702, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / △ converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / △ converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance;

[0098] Step 703, use the test equipment to apply the test voltage on the incoming side switch side, and connect the test load on the middle switch side to simulate the primary load current flowing through the side switch and the middle switch, and check whether the relative polarity relationship and transformation ratio of the current loop of the side switch and the middle switch are correct.

[0099] Furthermore, the AC filter reconstruction and expansion protection vector inspection specifically includes:

[0100] Step 801, short-circuit the current transformers at the head and tail of the AC filter, apply a test source at the side switch, simulate the primary load current flowing through the large group AC filter incoming line and the small group AC filter current transformer, and check whether the relative polarity relationship and transformation ratio of the filter large group protection and small group protection current loops are correct;

[0101] Step 802, short-circuit the head and tail current transformers of other groups of AC filters in turn, and perform inspection according to step 801;

[0102] Step 803, use the test equipment to apply the test source on the incoming side switch side, and connect the test load on the middle switch side, to simulate the primary load current flowing through the side switch and the middle switch, and check whether the relative polarity relationship and transformation ratio of the current loop of the side switch and the middle switch are correct.

[0103] Furthermore, the phase regulator reconstruction and expansion protection vector inspection specifically includes:

[0104] The current and voltage homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including:

[0105] Connect the two ends of the phase regulator with a short-circuit line, apply a test source and a test load to both sides of the phase regulator from different sources, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase regulator are correct;

[0106] The current and voltage non-homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including:

[0107] Connect the two ends of the phase modulator with a short-circuit line, apply test sources and short circuits on both sides of the phase modulator with non-homologous sources, apply test voltage on the primary side of the phase modulator PT, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase modulator are correct.

[0108] The following provides a specific embodiment of double bus line reconstruction and expansion protection vector inspection:

[0109] The current and voltage homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0110] Reference Figure 1 As shown, the power outage scope: 264 switch circuit maintenance at station A, 285 switch circuit maintenance at station B, and line maintenance. Figure 1 The red line in the middle represents the test circuit.

[0111] Line backup protection, voltage phase verification and differential protection vector inspection steps:

[0112] 1. The power supply of the test equipment is taken from the station power supply;

[0113] 2. The test power supply applies the test voltage on the outgoing line side of the line, and the test load is connected to the grounding switch side of the busbar side to simulate the primary load current and voltage, and check whether the line backup protection vector is correct;

[0114] 3. Complete the phase check of line voltage and bus voltage by measuring the phase relationship between the station power supply and the system voltage;

[0115] 4. Select the grounding switch on the bus side of the substation to apply the test voltage, and connect the test load to the grounding switch on the bus side of the terminal station. The grounding switches should be disconnected, and the simulated load current should flow through the line switch and the current transformers on both sides to check whether the line differential protection vector is correct.

[0116] Note: Voltage phase verification method: The station power supply is taken from the low-voltage side of the station transformer. Assuming that the main transformer is connected at 11 points and the station transformer is connected at 11 points, the system voltage is converted by the main transformer and the station transformer. It can be concluded that the angle between the system voltage and the station power supply is 60°. Check the relationship between the line voltage and the bus voltage in the bus protection device to complete the voltage phase verification.

[0117] Steps involved in checking busbar protection vector:

[0118] 1. Withdraw one of the busbar protection systems, reconstruct and expand the line interval current to access the withdrawn busbar protection system, and take corresponding safety measures;

[0119] 2. Apply simulated primary load current according to the line backup protection vector check method;

[0120] 3. Calculate the phase relationship between the test current and the branch current through the phase relationship between the station power supply and the system voltage, the phase relationship between the station power supply and the test current, and the relationship between the system voltage and the branch current of another branch of the bus, and verify it through the bus protection display result;

[0121] 4. After the test, restore the busbar protection and perform another set of busbar protection checks in the same way.

[0122] Note: Assuming that the station power supply is at an angle of 60° to the system voltage, the line protection device shows that the line voltage of the modified and expanded line interval and the simulated load current angle are 80°, and the voltage of the other branch of the bus and the branch current angle are 70°. The calculated difference between the load current and the other branch current angle is 50°, which is checked with the actual display value of the bus protection.

[0123] The current and voltage non-homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including:

[0124] Reference Figure 2 As shown, the power outage scope: 264 switch circuit maintenance at station A, 285 switch circuit maintenance at station B, and line maintenance. Figure 2 The red line in the middle represents the test circuit.

[0125] The steps for checking the line voltage phase, backup protection, and differential protection vector are as follows:

[0126] 1. Verify that the phase sequence, connection method and polarity of each secondary winding of the voltage transformer are correct. The protective voltage can be passed through the short-circuit switch position to carry out the secondary voltage phase verification work. When using a busbar voltage transformer, the protective voltage can be passed through the short-circuit switch position and other methods to carry out the secondary voltage phase verification work; when using a newly invested independent voltage transformer, the voltage phase verification and voltage secondary circuit verification work can be carried out through the no-load boost method.

[0127] 2. The test equipment collects the system power supply as the reference, and inputs the protection voltage to the protection device by short-circuiting the switch position. The test equipment simulates the primary load current that is at a certain angle to the reference voltage and flows through the current transformer. After being converted into secondary current, it is injected into the protection device to check whether the line backup protection vector is correct;

[0128] 3. Both stations use the system power supply as the benchmark and use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct.

[0129] Steps involved in checking busbar protection vector:

[0130] 1. Select a suitable current branch as the reference for the disabled busbar protection, and short-circuit the current of the branch at the busbar protection terminal block. At this time, the primary differential current of the busbar protection is the primary current of the branch;

[0131] 2. Inject a primary current with the same amplitude and phase as the branch into the newly built interval, and check that the differential current of the busbar protection is 0; inject a primary current with the opposite amplitude and phase to the branch, and the primary differential current of the busbar protection is twice the primary current of the branch. The above method is a branch replacement method, and the inspection is correct if the above conditions are met.

[0132] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and improved concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A load simulation relay protection vector inspection method, characterized in that: include: Use load simulation relay protection vector inspection test method to carry out vector inspection test of the reconstruction and expansion project before the relay protection is officially put into operation; The vector inspection of the reconstruction and expansion project includes double bus line reconstruction and expansion protection vector inspection, 3 / 2 bus line reconstruction and expansion protection vector inspection, double bus transformer reconstruction and expansion protection vector inspection, converter transformer reconstruction and expansion protection vector inspection, AC filter reconstruction and expansion protection vector inspection, and phase shifter reconstruction and expansion protection vector inspection; The load simulation relay protection vector inspection test method includes a current and voltage homologous application test and a current and voltage non-homologous application test, and the double bus line reconstruction and expansion protection vector inspection, 3 / 2 bus line reconstruction and expansion protection vector inspection, double bus transformer reconstruction and expansion protection vector inspection, and phase shifter reconstruction and expansion protection vector inspection are respectively performed through the current and voltage homologous application test and the current and voltage non-homologous application test; The double busbar line reconstruction and expansion protection vector inspection specifically includes: The current and voltage homologous application test is used to check the protection vector of the double busbar line reconstruction and expansion, including: Step 101, applying a test voltage to the outgoing line side of the expansion and reconstruction line, connecting a test load to the ground switch on the bus side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct; Step 102, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line, simulating a primary load current, and checking whether the line differential protection vector is correct; Step 103 involves checking the busbar protection vector of the expansion line, and checks the busbar protection vector by combining busbar protection rotation stop with relevant branch information; The current and voltage non-homologous source application test is used to check the protection vector of the double busbar line reconstruction and expansion, including: Step 201, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct; Step 202, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line backup protection vector is correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply; Step 203, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct; Step 204, involving bus protection vector inspection of the reconstruction and expansion line, using bus protection rotation shutdown mode combined with relevant branch information to perform bus protection vector inspection; The AC filter reconstruction and expansion protection vector inspection specifically includes: Step 801, short-circuit the current transformers at the head and tail of the AC filter, apply a test source at the side switch, simulate the primary load current flowing through the large group AC filter incoming line and the small group AC filter current transformer, and check whether the relative polarity relationship and transformation ratio of the filter large group protection and small group protection current loops are correct; Step 802, short-circuit the head and tail current transformers of other groups of AC filters in turn, and perform inspection according to step 801; Step 803, using the test equipment to apply the test source on the incoming side switch side, and to connect the test load on the middle switch side, to simulate the primary load current flowing through the side switch and the middle switch, and to check whether the relative polarity relationship and transformation ratio of the current loops of the side switch and the middle switch are correct; The phase regulator reconstruction and expansion protection vector inspection specifically includes: The current and voltage homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including: Connect the two ends of the phase regulator with a short-circuit line, apply a test source and a test load to both sides of the phase regulator from different sources, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase regulator are correct; The current and voltage non-homogeneous application test is used to check the protection vector of the phase regulator renovation and expansion, including: Connect the two ends of the phase modulator with a short-circuit line, apply test sources and short circuits on both sides of the phase modulator with non-homologous sources, apply test voltage on the primary side of the phase modulator PT, simulate the primary load current flowing through the current transformers on both sides, and check whether the backup protection and differential protection vectors of the phase modulator are correct.

2. A load simulation relay protection vector inspection method according to claim 1, characterized in that: The 3 / 2 bus line reconstruction and expansion protection vector inspection specifically includes: The current and voltage homologous application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including: Step 301, applying a test voltage to the side switch of the expansion and reconstruction line, connecting a test load to the middle switch side, simulating the primary load current and voltage, performing voltage phase checking on the expansion and reconstruction line, and checking whether the line backup protection vector is correct; Step 302, applying a test voltage and connecting a test load to the substations on both sides of the reconstruction and expansion line to simulate a primary load current and check whether the line differential protection vector is correct; Step 303, involving bus protection of the expansion and reconstruction line, adjacent interval line in the same string or main transformer protection vector check, bus protection rotation stop mode combined with relevant branch information to perform bus protection vector check; The current and voltage non-homologous application test is used to check the protection vector of the 3 / 2 bus line reconstruction and expansion, including: Step 401, verifying whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct; Step 402, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the line, circuit breaker backup protection vector and voltage core phase are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply; Step 403, at the substations on both sides of the reconstruction and expansion line, using the system power supply as a reference or adopting a synchronous timing method, respectively use test equipment to simulate the primary load current flowing through the current transformer to check whether the line differential protection vector is correct; Step 404 involves a vector check of busbar protection of the expanded or rebuilt line, adjacent interval lines in the same string, or main transformer protection, and the busbar protection rotation stop method is used to perform the vector check.

3. A load simulation relay protection vector inspection method according to claim 1, characterized in that: The double busbar transformer reconstruction and expansion protection vector inspection specifically includes: The current and voltage homogeneous application test is used to check the protection vector of the double bus transformer renovation and expansion, including: Step 501, applying a test voltage to the medium voltage side of the transformer, closing the busbar grounding switch on the high voltage side of the transformer, simulating a primary load current to flow through the medium and high voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector on the medium and high side and the differential protection vector on the medium and high sides of the transformer protection device are correct; Step 502, applying a test voltage to the medium voltage side of the transformer, connecting a ground wire to the low voltage side of the transformer, simulating a primary load current to flow through the medium and low voltage sides of the main transformer in a short-circuit manner, and checking whether the backup protection vector of the medium and low sides of the transformer protection device and the differential protection vector of the medium and low sides are correct; Step 503, a transformer branch voltage phase checking method, and a double bus line reconstruction and expansion protection vector checking method; Step 504 involves checking the bus protection vector of the transformer branch to be rebuilt and expanded, and the bus protection vector is checked by combining the bus protection rotation stop mode with the relevant branch information; The current and voltage non-homologous source application test is used to check the protection vector of the double bus transformer renovation and expansion, including: Step 601, verify whether the phase sequence, connection mode and polarity relationship of each secondary winding of the voltage transformer are correct; Step 602, based on the system power supply, applying the working voltage of the protection device, simulating the primary load current flowing through the current transformer, and checking whether the backup protection vectors on each side of the main transformer protection device are correct; wherein the system power supply includes the operating secondary voltage, current, and station power supply; Step 603, each side uses the system power supply as a reference, uses a test device to simulate the primary current flowing through the current transformers on each side of the main transformer, and checks whether the differential protection vector of the main transformer protection is correct; Step 604 involves checking the busbar protection vector of the main transformer to be rebuilt or expanded, and the busbar protection vector is checked by combining busbar protection rotation with relevant branch information.

4. A load simulation relay protection vector inspection method according to claim 1, characterized in that: The converter transformation and expansion protection vector check specifically includes: Step 701, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / Y converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / Y converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance; Step 702, short-circuit the valve-side bushing ends of the A, B, and C phases of the Y / △ converter transformer, use the test equipment to apply the test voltage on the side switch of the incoming line, and check whether the relative polarity relationship and transformation ratio of the side switch part of the converter transformer protection device and the Y / △ converter transformer wiring current loop are correct in combination with the differential current information of the converter transformer protection device; if the three-phase converter transformer impedance reaches 18% of the short-circuit impedance of the converter transformer, the series capacitor in the test loop reduces the converter transformer impedance; Step 703, use the test equipment to apply the test voltage on the incoming side switch side, and connect the test load on the middle switch side to simulate the primary load current flowing through the side switch and the middle switch, and check whether the relative polarity relationship and transformation ratio of the current loop of the side switch and the middle switch are correct.

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