CN110646687B

CN110646687B - Distance protection setting value field calibration system and method for power grid transmission line

Info

Publication number: CN110646687B
Application number: CN201910837918.4A
Authority: CN
Inventors: 王世祥; 吴海涛; 谷斌; 郭乐欣
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2022-02-08
Anticipated expiration: 2039-09-05
Also published as: CN110646687A

Abstract

The invention provides a distance protection setting value on-site calibration system of a power grid transmission line, which comprises a relay protection outlet action loop and three logic circuits; each logic circuit realizes the simulation of each phase-to-ground fault or each interphase fault of the power grid transmission line by loading various voltage setting values and current setting values; each logic circuit comprises an AND gate, an OR gate and a switch relay; the input end of the AND gate is connected with the output ends of the OR gate and the switch relay, and the output end of the AND gate is connected with the action loop of the relay protection outlet; two input ends of the OR gate are connected with two external signal sources; the input end of the switch relay is connected with a plurality of relays loaded with A, B, C phase voltage setting values and current setting values; and the relay protection outlet action loop verifies the voltage and current setting values which are actually loaded when the logic circuit to be verified simulates each phase grounding fault or each phase fault through the protection state. By implementing the method, the setting value on the power grid transmission line can be quickly checked on site.

Description

Distance protection setting value field calibration system and method for power grid transmission line

Technical Field

The invention relates to the technical field of relay protection, in particular to a distance protection setting value on-site calibration system and method for a power grid transmission line.

Background

Along with the development of a power grid, the number of relay protection devices is increased gradually, before the relay protection devices are put into operation, the functions of the relay protection devices must be checked gradually according to a setting value, whether defects exist can be found through checking, the relay protection devices can be put into operation after the defects are eliminated, and otherwise, the power grid accidents can be caused by incorrect actions of the relay protection devices; the relay protection device has the defects of wiring errors, incorrect logic relation of protection, incorrect connection mode of the throwing-withdrawing connecting sheet and the like.

At present, a power grid transmission line is provided with various protections such as longitudinal differential protection, distance protection, zero sequence protection and the like. Obviously, the especially important protection on the power grid transmission line is distance protection, and the distance protection comprises grounding distance protection (including sections I, II and III) set when the power grid transmission line has a fault to the ground and interphase distance protection (including sections I, II and III) set when the power grid transmission line has a fault to the interphase, so that setting values of different faults on the power grid transmission line need to be checked through whether the distance protection of a relay protection device acts or not, hidden dangers are found in time, and the safe operation of the power grid transmission line is guaranteed.

However, a method for gradually checking the distance protection setting value of the power grid power transmission line is still lacked at present, and particularly, the distance protection setting value of the power grid power transmission line is checked on site, so that potential hazards exist in the safe operation of the power grid power transmission line.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a distance protection setting value on-site calibration system and method for a power grid power transmission line, which can perform on-site calibration of setting values of a ground fault and an inter-phase fault on the power grid power transmission line according to whether a relay protection outlet action loop performs a grounding and inter-phase distance protection action, so as to find hidden dangers in time and provide guarantee for safe operation of the power grid power transmission line.

In order to solve the technical problem, an embodiment of the present invention provides a distance protection setting value field calibration system for a power grid transmission line, which is arranged on a relay protection device, and includes a relay protection outlet action loop and three logic circuits connected to the relay protection outlet action loop; wherein the content of the first and second substances,

each logic circuit is used for respectively simulating each grounding fault or each interphase fault on a corresponding one of the sections I, II and III of the power grid transmission line by loading various voltage setting values and current setting values; each logic circuit comprises an AND gate, an OR gate and a switch relay; each AND gate comprises two input ends and an output end, wherein one of the two input ends is connected with the output end of the OR gate on the same logic circuit, the other of the two input ends is connected with the output end of the switch relay on the same logic circuit, and the output end is connected with the relay protection outlet action loop; each OR gate comprises two input ends and an output end, wherein one of the two input ends is connected with an external signal source of which the corresponding output grounding distance protection logic control instruction is 1 or 0, the other input end is connected with the other external signal source of which the corresponding output interphase distance protection logic control instruction is 1 or 0, and the output end is connected with one input end of the AND gate on the same logic circuit; each switch relay comprises three input ends and an output end, wherein one of the three input ends is connected in series with two relays which are respectively loaded with an A-phase voltage setting value and an A-phase current setting value, the other of the three input ends is connected in series with two relays which are respectively loaded with a B-phase voltage setting value and a B-phase current setting value, the last of the three input ends is connected in series with two relays which are respectively loaded with a C-phase voltage setting value and a C-phase current setting value, and the output end is connected with the other input end of an AND gate on the same logic circuit;

the relay protection outlet action loop is used for sequentially determining that each of the three logic circuits is a logic circuit to be verified according to a preset verification sequence, loading various voltage setting values and current setting values on each logic circuit to be verified to simulate each phase-to-ground fault or each phase-to-phase fault to generate a corresponding protection state, and further verifying the actually loaded voltage setting value and current setting value of each logic circuit to be verified when each phase-to-ground fault or each phase-to-phase fault occurs from the various voltage setting values and current setting values loaded by each logic circuit to be verified according to the corresponding generated protection state; wherein the protection state comprises protection action start and protection action not start.

The relay protection outlet action loop is used for verifying a voltage setting value and a current setting value which are actually loaded when each logic circuit to be verified has each phase grounding fault or each phase-to-phase fault by correspondingly generating a protection state as protection action starting.

When each logic circuit to be verified is loaded with an A-phase voltage setting value and an A-phase current setting value, and is loaded with a grounding distance protection logic control command of 1, and an interphase distance protection logic control command of 0 to simulate an A-phase grounding fault, a protection state generated by the relay protection outlet action loop is protection action starting, and the grounding distance impedance fixed value of a corresponding one of the power transmission line sections I, II and III corresponding to the current logic circuit to be verified, which is required by the actually loaded A-phase voltage setting value of each logic circuit to be verified and is equal to 0.95 times of the A-phase current setting value (1+ zero sequence compensation coefficient K), is verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset first positive sequence sensitive angle; the zero sequence compensation coefficient K is a constant; the fixed value of the impedance of the grounding distance of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

when each logic circuit to be verified is loaded with a B-phase voltage setting value and a B-phase current setting value, a grounding distance protection logic control command is loaded to be 1, and an interphase distance protection logic control command is loaded to be 0 to simulate a B-phase grounding fault, a protection state generated by the relay protection outlet action loop is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified, which is required by the actually loaded B-phase voltage setting value of each logic circuit to be verified and is equal to 0.95 times of the B-phase current setting value (1+ zero sequence compensation coefficient K), is verified; the phase of the phase B current lags the phase of the phase B voltage according to the preset first positive sequence sensitive angle;

when each logic circuit to be verified is loaded with a C-phase voltage setting value and a C-phase current setting value, and is loaded with a grounding distance protection logic control command of 1, and an interphase distance protection logic control command of 0 to simulate a C-phase grounding fault, a protection state generated by the relay protection outlet action loop is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of the first, second and third sections of the power grid transmission line corresponding to the current logic circuit to be verified, wherein the C-phase voltage setting value required to be actually loaded by each logic circuit to be verified for the C-phase grounding fault is verified to be equal to 0.95 times of the C-phase current setting value (1+ zero-sequence compensation coefficient K); and the phase of the C-phase current lags the phase of the C-phase voltage according to the preset first positive sequence sensitive angle.

The fixed value of the grounding distance impedance of the first section of the power grid transmission line is 7.1 ohms, the fixed value of the grounding distance impedance of the second section of the power grid transmission line is 11.05 ohms, and the fixed value of the grounding distance impedance of the third section of the power grid transmission line is 13.29 ohms.

When each logic circuit to be verified is loaded with A, B phase voltage setting values and A, B phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0, and an interphase distance protection logic control command is loaded to be 1 to simulate an AB interphase fault, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that A, B phase voltage setting values required to be actually loaded by the AB interphase fault of each logic circuit to be verified are equal, A, B phase current setting values are equal, and A, B phase voltage setting values are equal to 2 x 0.95 times of A phase current setting values or B phase current setting values, and are equal to interphase distance impedance fixed values of a corresponding one of power transmission line sections I, II and III corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle; the interphase distance impedance fixed value of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

when each logic circuit to be verified is loaded with B, C phase voltage setting values and B, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0 and an interphase distance protection logic control command is loaded to be 1 to simulate BC interphase faults, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that B, C phase voltage setting values needed to be actually loaded by the BC interphase faults of each logic circuit to be verified are equal, B, C phase current setting values are equal, and B, C phase voltage setting values are all equal to 2-0.95 times of B phase current setting values or C phase current setting values equal to an interphase distance impedance fixed value of a corresponding one of power transmission line I, II and III sections corresponding to the current logic circuit to be verified; the phase of the phase C current lags the phase of the phase C voltage according to the preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle;

when each logic circuit to be verified is loaded with A, C phase voltage setting values and A, C phase current setting values at the same time, and is loaded with a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate an AC interphase fault, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that A, C phase voltage setting values required by the actual loading of the AC interphase fault of each logic circuit to be verified are equal, A, C phase current setting values are equal, and A, C phase voltage setting values are all equal to 2-0.95 times of A phase current setting values or C phase current setting values equal to an interphase distance impedance fixed value of a corresponding one of power transmission line I, II and III sections corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to the preset second positive sequence sensitive angle, and the phase of the phase C current lags the phase of the phase C voltage according to the preset second positive sequence sensitive angle.

When each logic circuit to be verified simultaneously loads A, B, C phase voltage setting values and A, B, C phase current setting values, loads a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate an ABC three-phase fault, the relay protection outlet action loop is started in a generated protection state as a protection action, the fact that the A, B, C phase voltage setting values needed to be actually loaded by the ABC three-phase fault of each logic circuit to be verified are equal is verified, the A, B, C phase current setting values are equal, and the A, B, C phase voltage setting values are all equal to 2 x 0.95 times of the A phase current setting value or the B phase current setting value or the C phase current setting value and are equal to the interphase distance impedance fixed value of a corresponding one of the I, II and III sections of the power transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset third positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset third positive sequence sensitive angle; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset third positive sequence sensitive angle; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

The fixed value of the interphase distance impedance of the I section of the power grid transmission line is 7.1 ohms, the fixed value of the interphase distance impedance of the II section of the power grid transmission line is 11.05 ohms, and the fixed value of the interphase distance impedance of the III section of the power grid transmission line is 13.29 ohms.

The embodiment of the invention also provides a distance protection setting value field calibration method of the power grid power transmission line, which is realized on the distance protection setting value field calibration system of the power grid power transmission line, and the method comprises the following steps:

acquiring a preset check sequence in a relay protection outlet action loop, and sequentially determining that each of the three logic circuits is a logic circuit to be checked according to the preset check sequence;

acquiring a protection state generated when each logic circuit to be verified is loaded with an A-phase voltage setting value and an A-phase current setting value, a grounding distance protection logic control command is 1 and an interphase distance protection logic control command is 0 to simulate an A-phase grounding fault by the relay protection outlet action loop, and verifying that the actually loaded A-phase voltage setting value required by the A-phase grounding fault of each logic circuit to be verified is equal to 0.95 times of the A-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset first positive sequence sensitive angle; the zero sequence compensation coefficient K is a constant; the fixed value of the impedance of the grounding distance of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

acquiring a protection state generated when each logic circuit to be verified is loaded with a B-phase voltage setting value and a B-phase current setting value, a grounding distance protection logic control command is 1 and an interphase distance protection logic control command is 0 to simulate a B-phase grounding fault by the relay protection outlet action loop, and verifying that the actually loaded B-phase voltage setting value required by each logic circuit to be verified, which is connected with the B-phase grounding fault, is equal to 0.95 time of the B-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase B current lags the phase of the phase B voltage according to the preset first positive sequence sensitive angle;

acquiring a protection state generated when each logic circuit to be verified is loaded with a C-phase voltage setting value and a C-phase current setting value, a grounding distance protection logic control command is 1 and an interphase distance protection logic control command is 0 to simulate a C-phase grounding fault by the relay protection outlet action loop, and verifying that the actually loaded C-phase voltage setting value required by each logic circuit to be verified for the C-phase grounding fault is equal to 0.95 times of the C-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; and the phase of the C-phase current lags the phase of the C-phase voltage according to the preset first positive sequence sensitive angle.

The embodiment of the invention also provides another distance protection setting value field calibration method of the power grid power transmission line, which is realized on the distance protection setting value field calibration system of the power grid power transmission line, and the method comprises the following steps:

the method comprises the steps that A, B phase voltage setting values and A, B phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1, a protection state generated when AB interphase faults are simulated is a protection action starting state, it is verified that A, B phase voltage setting values needed to be actually loaded by each logic circuit to be verified for AB interphase faults are equal, A, B phase current setting values are equal, and A, B phase voltage setting values are equal to 2-0.95 times of A phase current setting values or B phase current setting values equal to interphase distance impedance setting values of a corresponding one of power grid transmission line sections I, II and III corresponding to the logic circuit to be verified currently; the phase of the phase A current lags the phase of the phase A voltage according to a preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle; the interphase distance impedance fixed value of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

the method comprises the steps that B, C phase voltage setting values and B, C phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1, a protection state generated when BC interphase faults are simulated is a protection action starting, it is verified that B, C phase voltage setting values needed to be actually loaded for BC interphase faults of each logic circuit to be verified are equal, B, C phase current setting values are equal, and B, C phase voltage setting values are equal to 2 x 0.95 times of B phase current setting values or C phase current setting values, and are equal to interphase distance impedance fixed values of a corresponding one of power grid transmission line sections I, II and III corresponding to the current logic circuit to be verified; the phase of the phase C current lags the phase of the phase C voltage according to the preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle;

the method comprises the steps that A, C phase voltage setting values and A, C phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1, a protection state generated when an AC interphase fault is simulated is a protection action starting, it is verified that A, C phase voltage setting values needed to be actually loaded for the AC interphase fault of each logic circuit to be verified are equal, A, C phase current setting values are equal, and A, C phase voltage setting values are equal to 2 phase current setting values 0.95 times or C phase current setting values equal to an interphase distance impedance fixed value of a corresponding one of power grid transmission line sections I, II and III corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset positive sequence sensitive angle, and the phase of the phase C current lags the phase of the phase C voltage according to a preset positive sequence sensitive angle.

the method comprises the steps that A, B, C phase voltage setting values and A, B, C phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1, a protection state generated when ABC three-phase faults are simulated is a protection action starting state, it is verified that A, B, C phase voltage setting values needed to be actually loaded for the ABC three-phase faults of each logic circuit to be verified are equal, A, B, C phase current setting values are equal, and A, B, C phase voltage setting values are equal to 2-0.95 times of A phase current setting values or B phase current setting values or C phase current setting values and interphase distance impedance fixed values of corresponding one of power transmission line sections I, II and III corresponding to the logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset third positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset third positive sequence sensitive angle; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset third positive sequence sensitive angle; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

The embodiment of the invention has the following beneficial effects:

the invention realizes the simulation of each phase-to-ground fault or each phase-to-phase fault on the corresponding one of the I, II and III sections of the power grid transmission line by loading various voltage setting values and current setting values on each logic circuit, and verifies the setting values of the ground fault and the phase-to-phase fault on the power grid transmission line by judging whether the grounding and phase-to-phase distance protection of the relay protection outlet action loop acts or not, thereby finding hidden dangers in time and providing guarantee for the safe operation of the power grid transmission line.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a distance protection setting value field calibration system of a power grid transmission line provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the logic connection between a single logic circuit and a relay protection outlet action loop in FIG. 1;

FIG. 3 is a schematic diagram of the logical connection between the relay loaded with the voltage setting value and the current setting value and the switching relay in a single logic circuit in FIG. 2;

fig. 4 is a flowchart of a distance protection setting value field calibration method for a power grid transmission line according to an embodiment of the present invention;

fig. 5 is a flowchart of another distance protection setting value field calibration method for a power transmission line of a power grid according to an embodiment of the present invention;

fig. 6 is a flowchart of another distance protection setting value field calibration method for a power transmission line of a power grid according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the distance protection setting value on-site calibration system for a power transmission line of a power grid provided in the embodiment of the present invention is arranged on a relay protection device, and includes a relay protection outlet operation loop 1 and three logic circuits 2 connected to the relay protection outlet operation loop 1; wherein the content of the first and second substances,

each logic circuit 2 is used for respectively simulating each grounding fault or each interphase fault on a corresponding one of the sections I, II and III of the power grid transmission line by loading various voltage setting values and current setting values; as shown in fig. 2, taking the logic circuit corresponding to the first section of the power transmission line of the power grid as an example, each logic circuit 2 includes an and gate M2, an or gate M1, and a switch relay BCJ; each and gate M2 includes two input terminals and an output terminal, one of the two input terminals is connected to the output terminal of the or gate on the same logic circuit, the other of the two input terminals is connected to the output terminal of the switch relay BCJ on the same logic circuit, and the output terminal is connected to the relay protection outlet action loop 1; each or gate M1 includes two input terminals and an output terminal, one of the two input terminals is connected to an external signal source (such as P1, P3 or P5) corresponding to the output ground distance protection logic control command being 1 or 0, the other of the two input terminals is connected to another external signal source (such as P2, P4 or P6) corresponding to the output interphase distance protection logic control command being 1 or 0, and the output terminal is connected to an input terminal of an and gate on the same logic circuit; each switch relay BCJ comprises three input ends and an output end, wherein one of the three input ends is connected in series with two relays (such as 1YJ and 1LJ) which are respectively loaded with an A-phase voltage setting value and an A-phase current setting value, the other of the three input ends is connected in series with two relays (such as 2YJ and 2LJ) which are respectively loaded with a B-phase voltage setting value and a B-phase current setting value, the last of the three input ends is connected in series with two relays (such as 3YJ and 3LJ) which are respectively loaded with a C-phase voltage setting value and a C-phase current setting value, and the output end is connected with the other input end of an AND gate on the same logic circuit; it should be noted that all relays (such as 1YJ to 3YL and 1LJ to 3LJ) to which the switching relay BCJ is connected are trigger relays, and the switching relay BCJ can be closed as long as a signal is received;

the relay protection outlet action loop 1 is used for sequentially determining that each of the three logic circuits 2 is a logic circuit to be verified according to a preset verification sequence (such as the sequence of sections I, II and III of a power grid transmission line), loading various voltage setting values and current setting values on each logic circuit to be verified to simulate each phase-to-ground fault or each phase-to-phase fault to generate a corresponding protection state, and verifying the actually loaded voltage setting value and current setting value of each logic circuit to be verified when each phase-to-ground fault or each phase-to-phase fault occurs from the various voltage setting values and current setting values loaded by each logic circuit to be verified according to the corresponding generated protection state; wherein the protection state comprises protection action start and protection action not start.

It should be noted that, when each logic circuit to be verified simulates occurrence of each phase-to-ground fault or each phase-to-phase fault, the relay protection outlet operation loop 1 verifies the actually loaded voltage setting value and current setting value of each logic circuit to be verified when each phase-to-ground fault or each phase-to-phase fault occurs by using the correspondingly generated protection state as the protection operation start. Of course, the relay protection outlet action loop 1 may also check the voltage setting value and the current setting value which are actually loaded when each phase ground fault or each inter-phase fault occurs in each logic circuit to be checked by controlling the audible and visual alarm when each phase ground fault or each inter-phase fault occurs in each logic circuit to be checked.

In the embodiment of the invention, each of the first, second and third sections of the power grid transmission line comprises A, B, C-phase single-phase earth faults, AB, BC and CA two-phase faults and ABC three-phase faults, so that an actual voltage setting value and a current setting value corresponding to all faults of any one of the first, second and third sections of the power grid transmission line need to be checked. The specific verification method is as follows:

(1) phase a ground fault: when each logic circuit to be verified is loaded with an A-phase voltage setting value and an A-phase current setting value, a grounding distance protection logic control command is loaded to be 1, and an interphase distance protection logic control command is loaded to be 0 to simulate an A-phase grounding fault, a protection state generated by a relay protection outlet action loop 1 is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of sections I, II and III of a power grid transmission line corresponding to the current logic circuit to be verified, which is required by the actually loaded A-phase voltage setting value of each logic circuit to be verified and is equal to 0.95 times of the A-phase current setting value (1+ zero sequence compensation coefficient K); the phase of the phase A current lags the phase of the phase A voltage according to a first positive sequence sensitive angle preset by a relay protection outlet action loop 1; the zero sequence compensation coefficient K is a constant, such as 0.67 or 0.7; the fixed value of the impedance of the grounding distance of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

It should be noted that the first positive sequence sensitive angle preset in the relay protection outlet action loop 1 is a fixed value, such as 71 degrees; the fixed value of the grounding distance impedance of each of the sections I, II and III of the power grid transmission line is obtained according to actual impedance measurement, and if the fixed value of the grounding distance impedance of the section I of the power grid transmission line is 7.1 ohms, the fixed value of the grounding distance impedance of the section II of the power grid transmission line is 11.05 ohms, and the fixed value of the grounding distance impedance of the section III of the power grid transmission line is 13.29 ohms. When other subsequent phase-to-ground faults occur, the same positive sequence sensitive angle in the phase-A ground fault and the same fixed values of the grounding distance impedances of the sections I, II and III of the corresponding power grid transmission line are adopted, and the description is omitted.

It is understood that the simulated ground fault is learned using an external signal source outputting a ground distance protection logic control command of 1 and another external signal source outputting an inter-phase distance protection logic control command of 0, so as not to be confused.

(2) Phase B ground fault: when each logic circuit to be verified is loaded with a B-phase voltage setting value and a B-phase current setting value, a grounding distance protection logic control command is loaded to be 1, and an interphase distance protection logic control command is loaded to be 0 to simulate a B-phase grounding fault, a protection state generated by a relay protection outlet action loop 1 is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of sections I, II and III of a power grid transmission line corresponding to the current logic circuit to be verified, which is required by the actual loaded B-phase voltage setting value of each logic circuit to be verified, is verified to be equal to 0.95 times of the B-phase current setting value (1+ zero sequence compensation coefficient K); the phase of the phase B current lags the phase of the phase B voltage according to a first positive sequence sensitive angle preset by the relay protection outlet action loop 1.

(3) Phase C ground fault: when each logic circuit to be verified is loaded with a C-phase voltage setting value and a C-phase current setting value, and is loaded with a grounding distance protection logic control command of 1, and an interphase distance protection logic control command of 0 to simulate a C-phase grounding fault, a protection state generated by a relay protection outlet action loop 1 is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of the first, second and third sections of the power grid transmission line corresponding to the current logic circuit to be verified, wherein the C-phase voltage setting value required to be actually loaded by each logic circuit to be verified for the C-phase grounding fault is verified to be equal to 0.95 times of the C-phase current setting value (1+ zero-sequence compensation coefficient K); the phase of the phase C current lags the phase of the phase C voltage according to a first positive sequence sensitive angle preset by the relay protection outlet action loop 1.

(4) And AB phase fault: when each logic circuit to be verified is loaded with A, B phase voltage setting values and A, B phase current setting values at the same time, and is loaded with a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate an AB interphase fault, a protection state generated by a relay protection outlet action loop 1 is protection action starting, it is verified that A, B phase voltage setting values required by the actual loading of the AB interphase fault of each logic circuit to be verified are equal, the A, B phase current setting values are equal, and the A, B phase voltage setting values are all equal to 2-0.95 times of A phase current setting values or B phase current setting values, and are equal to interphase distance impedance setting values of a corresponding one of power grid transmission line I, II and III sections corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a second positive sequence sensitive angle preset by the relay protection outlet action loop 1, and the phase of the phase B current lags the phase of the phase B voltage according to a second positive sequence sensitive angle preset by the relay protection outlet action loop 1; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

It should be noted that the second positive sequence sensitive angle preset in the relay protection outlet action loop 1 is a fixed value, such as 71 degrees; the interphase distance impedance fixed value of each of the first, second and third sections of the power grid power transmission line is obtained according to actual impedance measurement, and if the interphase distance impedance fixed value of the first section of the power grid power transmission line is 7.1 ohms, the interphase distance impedance fixed value of the second section of the power grid power transmission line is 11.05 ohms and the interphase distance impedance fixed value of the third section of the power grid power transmission line is 13.29 ohms. When other subsequent interphase faults occur, the same positive sequence sensitive angle in the AB interphase fault and the same interphase distance impedance fixed values corresponding to the I, II and III sections of the power grid transmission line are adopted, and the details are not repeated.

It is understood that the simulated inter-phase fault is learned using an external signal source to output a ground distance protection logic control command of 0 and another external signal source to output an inter-phase distance protection logic control command of 1, so as not to be confused.

(5) And C, fault between the phases: when each logic circuit to be verified is loaded with B, C phase voltage setting values and B, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0 and an interphase distance protection logic control command is loaded to be 1 to simulate BC interphase faults, a protection state generated by a relay protection outlet action loop 1 is protection action starting, it is verified that B, C phase voltage setting values needed to be actually loaded by the BC interphase faults of each logic circuit to be verified are equal, B, C phase current setting values are equal, and B, C phase voltage setting values are equal to 2-0.95 times of B phase current setting values or C phase current setting values equal to an interphase distance impedance fixed value of a corresponding one of power grid I, II and III sections corresponding to the current logic circuit to be verified; the phase of the phase C current lags the phase of the phase C voltage according to a second positive sequence sensitive angle preset in the relay protection outlet action loop 1, and the phase of the phase B current lags the phase of the phase B voltage according to a second positive sequence sensitive angle preset in the relay protection outlet action loop 1;

(6) AC phase-to-phase failure: when each logic circuit to be verified is loaded with A, C phase voltage setting values and A, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0 and an interphase distance protection logic control command is loaded to be 1 to simulate an AC interphase fault, a protection state generated by a relay protection outlet action loop 1 is protection action starting, it is verified that A, C phase voltage setting values required by the actual loading of each logic circuit to be verified for the AC interphase fault are equal, A, C phase current setting values are equal, and A, C phase voltage setting values are equal to 2-0.95 times of A phase current setting values or C phase current setting values equal to an interphase distance impedance fixed value of a corresponding one of power transmission line sections I, II and III corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a second positive sequence sensitive angle preset in the relay protection outlet action loop 1, and the phase of the phase C current lags the phase of the phase C voltage according to a second positive sequence sensitive angle preset in the relay protection outlet action loop 1.

(7) ABC three-phase faults: when each logic circuit to be verified is loaded with A, B, C phase voltage setting values and A, B, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0, and an interphase distance protection logic control command is loaded to be 1 to simulate an ABC three-phase fault, a protection state generated by a relay protection outlet action loop 1 is protection action starting, it is verified that A, B, C phase voltage setting values needed to be actually loaded by each ABC three-phase fault of the logic circuit to be verified are equal, A, B, C phase current setting values are equal, and A, B, C phase voltage setting values are all equal to 2 x 0.95 times of A phase current setting values or B phase current setting values or C phase current setting values and are equal to an interphase distance impedance fixed value of a corresponding one of the I, II and III sections of a power transmission line corresponding to the logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a third positive sequence sensitive angle preset in the relay protection outlet action loop 1, and the phase of the phase B current lags the phase of the phase B voltage according to a third positive sequence sensitive angle preset in the relay protection outlet action loop 1; the phase of the C-phase current lags the phase of the C-phase voltage according to a third positive sequence sensitive angle preset in the relay protection outlet action loop 1; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

It should be noted that the first to third positive sequence sensitive angles are all preset constant values of the relay protection device body, and should all be equal.

In the embodiment of the invention, the correctness of the voltage setting value and the current setting value corrected by the relay protection outlet action loop 1 when each fault occurs can be further proved by changing the multiple of the voltage setting value and the corresponding current setting value thereof, the sensitive angle of the current hysteresis voltage and other modes.

Taking a logic circuit simulating a first section of the power transmission line of the power grid as an example, an application scene of the distance protection setting value field calibration system of the power transmission line of the power grid in the embodiment of the invention is further explained:

in the first step, a single-phase earth fault of A, B, C phases is described by taking an a-phase earth fault as an example.

Firstly, the I-segment grounding distance control word is set to be 1, namely the external signal source outputs a grounding distance protection logic control command to be 1, and the I-segment interphase distance I is set to be 0, namely the external signal source outputs an interphase distance protection logic control command to be 0.

Secondly, A, B, C, N three-phase voltage is added to the relay protection device body in a simulated mode, the current can be not added, and when a charging lamp on the relay protection device body is turned on, an action loop of a relay protection outlet is detected and started;

then, a positive direction single-phase earth fault is simulated, and a phase A current with proper magnitude is simulated and added (if the fixed value of the earth distance I section is very small, the fault current should be properly increased), wherein the phase A current is equal to 0.95 times of the fault current (such as 2A) × (1+ zero sequence compensation coefficient K) × the fixed value of the impedance of the earth distance I section (such as 7.1 ohm). The loaded angle of the phase A current lagging the phase A voltage is a positive sequence sensitive angle (such as 71 degrees) in a relay protection outlet action loop constant value, the phase A single-phase grounding is simulated, the fault state time is set to be 50ms, a period of positive sequence rated voltage is added to the relay protection outlet action loop after the fault state is 50ms, the time is longer than the device reclosing setting time, the single trip is protected, the relay protection outlet action loop controls a corresponding lamp on a relay protection device body panel to be on, the 'grounding distance I section action' is displayed on a relay protection device body liquid crystal, and the action time is 10 ms-35 ms.

Finally, verification is performed.

1) Setting a grounding distance control word of the I section to be 0, namely outputting a grounding distance protection logic control command of 0 by an external signal source, and setting a phase distance I section of the I section to be 1, namely outputting a phase distance protection logic control command of 1 by the external signal source, but not starting the protection action of a relay protection outlet action loop 1;

2) keeping the grounding distance control word of the input section I set to be 1, namely the external signal source outputs a grounding distance protection logic control command to be 1, and the input section I set to be 0, namely the external signal source outputs a interphase distance protection logic control command to be 0, and loading an A phase voltage to be equal to 1.05 times of A phase current (such as 2A) × (1+ zero sequence compensation coefficient K) × grounding distance I section impedance constant value (such as 7.1 ohm), but the relay protection outlet action loop protection action is not started;

3) the method comprises the steps of keeping a grounding distance control word of a segment I to be set to be 1, namely, an external signal source outputs a grounding distance protection logic control command to be 1, and keeping a phase-to-phase distance I of the segment I to be set to be 0, namely, the external signal source outputs a phase-to-phase distance protection logic control command to be 0, and meanwhile keeping an A phase voltage equal to 0.95 times of an A phase current (such as 2A) (1+ zero sequence compensation coefficient K) to be a grounding distance I impedance fixed value, wherein an angle of the A phase current lagging the A phase voltage is added with 180 degrees on the basis of a positive direction sensitive angle, but a relay protection outlet action circuit protection action is not started.

By analogy, the steps are repeated to realize B, C calibration of the distance protection setting value of the power grid transmission line in the phase-to-ground fault.

And step two, the interphase fault of the AB phase, the BC phase and the AC phase is explained by taking the AB interphase fault as an example.

Firstly, the I-segment grounding distance control word is set to be 0, namely the external signal source outputs a grounding distance protection logic control command to be 0, and the I-segment interphase distance I is set to be 1, namely the external signal source outputs an interphase distance protection logic control command to be 1.

next, a positive direction phase-to-phase fault is simulated, A, B phase currents with proper equal magnitude are simulated to be added (if the fixed value of the grounding distance I section is small, the fault current should be properly increased), and A, B phase voltages are all equal to 2 x 0.95 times the fixed value of the phase current a (such as 2A) and the impedance of the phase distance I section (such as 7.1 ohm). The angle of the loaded phase-A current lagging the phase-A voltage is a positive sequence sensitive angle (such as 71 degrees) in a relay protection outlet action loop constant value, the angle of the loaded phase-B current lagging the phase-B voltage is a positive sequence sensitive angle (such as 71 degrees) in the relay protection outlet action loop constant value, the fault state time is set to be 50ms, a period of positive sequence rated voltage is added to the relay protection outlet action loop after 50ms of the fault state, the time is longer than the device reclosing setting time, three jumps are protected, the relay protection outlet action loop controls corresponding lamps on a relay protection device body panel to be on, the phase-to-phase distance I section action is displayed on a relay protection device body liquid crystal, the action time is 10 ms-35 ms, and the action phase is AB.

Finally, verification is performed.

1) Setting a grounding distance control word of the I section to be 1, namely outputting a grounding distance protection logic control command of 1 by an external signal source, and setting a phase distance protection logic control command of the I section to be 0 by the external signal source, namely outputting a phase distance protection logic control command of 0 by the external signal source, but not starting a relay protection outlet action circuit protection action;

2) keeping the grounding distance control word of the input section I set to be 0, namely the external signal source outputs a grounding distance protection logic control command to be 0, and the input section I set to be 1, namely the external signal source outputs a interphase distance protection logic control command to be 1, and the loaded A, B phase voltages are all equal to 2 x 1.05 times of A phase current (such as 2A) x interphase distance I impedance constant value (such as 7.1 ohm), but the relay protection outlet action loop protection action is not started;

3) keeping the grounding distance control word of the I section of the input signal to be set to be 0, namely the external signal source outputs a grounding distance protection logic control command to be 0, and the phase distance I section of the input signal to be set to be 1, namely the external signal source outputs a phase distance protection logic control command to be 1, and simultaneously keeping A, B phase voltages to be equal to 2 x 0.95 times of phase current A (such as 2A) and phase distance I section impedance constant value (such as 7.1 ohm), wherein the angle of phase current A lagging the phase voltage is 180 degrees on the basis of a positive direction sensitive angle, and/or the angle of phase current B lagging the phase voltage is 180 degrees on the basis of the positive direction sensitive angle, but the relay protection outlet action loop protection action is not started.

By analogy, the steps are repeated to realize the calibration of the distance protection setting value of the power grid transmission line in the BC and AC phase-to-phase fault.

And thirdly, explaining the ABC three-phase-to-phase fault.

next, a positive direction phase-to-phase fault is simulated, A, B, C phase currents with proper equal magnitude are simulated to be added (if the fixed value of the grounding distance I section is small, the fault current should be properly increased), and A, B, C phase voltages are all equal to 2 x 0.95 times the fixed value of the phase current a (such as 2A) and the impedance of the phase distance I section (such as 7.1 ohm). At the moment, the loaded angle of the phase A current lagging the phase A voltage is a positive sequence sensitive angle (such as 71 degrees) in a relay protection outlet action loop fixed value, the loaded angle of the phase B current lagging the phase B voltage is a positive sequence sensitive angle (such as 71 degrees) in a relay protection outlet action loop 1 fixed value, the loaded angle of the phase C current lagging the phase C voltage is a positive sequence sensitive angle (such as 71 degrees) in a relay protection outlet action loop 1 fixed value, the fault state time is set to be 50ms, a certain period of positive sequence rated voltage is added to the relay protection outlet action loop after the fault state is 50ms, the time is longer than the device reclosing setting time, three-jump protection is realized, the relay protection outlet action loop controls corresponding lamps on a relay protection device body panel to be on bright, and the relay protection device body displays 'interphase distance I section action' on a liquid crystal, the action time is 10 ms-35 ms, and the action phase is ABC.

Finally, verification is performed.

2) keeping the grounding distance control word of the input section I set to be 0, namely the external signal source outputs a grounding distance protection logic control command to be 0, and the input section I set to be 1, namely the external signal source outputs a interphase distance protection logic control command to be 1, and the loaded A, B, C phase voltages are all equal to 2 x 1.05 times of A phase current (such as 2A) x interphase distance I impedance constant value (such as 7.1 ohm), but the relay protection outlet action loop protection action is not started;

3) keeping the grounding distance control word of the I-section of the input signal to be set to be 0, namely the external signal source outputs a grounding distance protection logic control command to be 0, and the phase-to-phase distance I of the I-section of the input signal to be set to be 1, namely the external signal source outputs a phase-to-phase distance protection logic control command to be 1, and simultaneously keeping A, B, C phase voltages to be equal to 2 x 0.95 times of phase-to-phase current (such as 2A) and phase-to-phase distance I section impedance constant value (such as 7.1 ohm), wherein the angle of phase-to-phase current lagging phase-to-phase voltage is 180 degrees on the basis of a positive direction sensitive angle, and/or the angle of phase-to-phase current lagging phase-to-phase voltage is 180 degrees on the basis of the positive direction sensitive angle, but the protection outlet action loop is not started.

As shown in fig. 4, in an embodiment of the present invention, the provided distance protection setting value field calibration method for a power transmission line of a power grid is implemented on the distance protection setting value field calibration system for the power transmission line of the power grid, and the method includes the following steps:

step S11, acquiring a preset verification sequence in the relay protection outlet action loop, and sequentially determining that each of the three logic circuits is a logic circuit to be verified according to the preset verification sequence;

step S12, obtaining a protection state generated when the relay protection outlet action loop simulates A-phase grounding faults when each logic circuit to be verified loads an A-phase voltage setting value and an A-phase current setting value and loads a grounding distance protection logic control command to be 1 and an interphase distance protection logic control command to be 0, and verifying that the actually loaded A-phase voltage setting value required by each logic circuit to be verified A-phase grounding fault is equal to 0.95 times of the A-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the first, second and third sections of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset first positive sequence sensitive angle; the zero sequence compensation coefficient K is a constant; the fixed value of the impedance of the grounding distance of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

step S13, obtaining a protection state generated when the relay protection outlet action loop simulates a B phase grounding fault when each logic circuit to be verified loads a B phase voltage setting value and a B phase current setting value and loads a grounding distance protection logic control instruction of 1 and an interphase distance protection logic control instruction of 0, and verifying that the B phase voltage setting value actually loaded required by the B phase grounding fault of each logic circuit to be verified is equal to 0.95 times of the B phase current setting value (1+ zero sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the I, II and III sections of the power transmission line corresponding to the current logic circuit to be verified; the phase of the phase B current lags the phase of the phase B voltage according to the preset first positive sequence sensitive angle;

step S14, obtaining a protection state generated when the relay protection outlet action loop simulates a C-phase grounding fault when each logic circuit to be verified loads a C-phase voltage setting value and a C-phase current setting value and loads a grounding distance protection logic control instruction of 1 and an interphase distance protection logic control instruction of 0, and verifying that the actually loaded C-phase voltage setting value required by the C-phase grounding fault of each logic circuit to be verified is equal to 0.95 times of the C-phase current setting value (1+ zero sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the power transmission line I, II and III sections corresponding to the current logic circuit to be verified; and the phase of the C-phase current lags the phase of the C-phase voltage according to the preset first positive sequence sensitive angle.

As shown in fig. 5, another distance protection setting value field calibration method for a power transmission line of a power grid, provided in the embodiment of the present invention, is implemented on the distance protection setting value field calibration system for the power transmission line of the power grid, and the method includes the following steps:

step S21, acquiring a preset verification sequence in the relay protection outlet action loop, and sequentially determining that each of the three logic circuits is a logic circuit to be verified according to the preset verification sequence;

step S22, obtaining a protection state generated when the relay protection outlet action loop simultaneously loads A, B phase voltage setting value and A, B phase current setting value on each logic circuit to be verified, loads a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate AB interphase fault, and verifying that A, B phase voltage setting values required by the AB interphase fault of each logic circuit to be verified are equal, A, B phase current setting values are equal, and A, B phase voltage setting values are equal to 2 x 0.95 times of A phase current setting value or B phase current setting value equal to an interphase distance impedance fixed value of a corresponding one of the first, second and third sections of the power transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle; the interphase distance impedance fixed value of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

step S23, obtaining a protection state generated when the relay protection outlet action loop simultaneously loads B, C phase voltage setting value and B, C phase current setting value on each logic circuit to be verified, loads a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate BC interphase fault as protection action starting, verifying that B, C phase voltage setting values needed to be actually loaded by BC interphase fault of each logic circuit to be verified are equal, B, C phase current setting values are equal, and B, C phase voltage setting values are equal to 2 x 0.95 times of B phase current setting value or C phase current setting value equal to an interphase distance impedance fixed value of a corresponding one of power transmission line sections I, II and III corresponding to the current logic circuit to be verified; the phase of the phase C current lags the phase of the phase C voltage according to the preset second positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset second positive sequence sensitive angle;

step S24, obtaining a protection state generated when the relay protection outlet action loop simultaneously loads A, C phase voltage setting value and A, C phase current setting value on each logic circuit to be verified, loads a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate an AC interphase fault, and verifying that A, C phase voltage setting values required by the actual loading of the AC interphase fault of each logic circuit to be verified are equal, A, C phase current setting values are equal, and A, C phase voltage setting values are equal to 2 x 0.95 times of A phase current setting value or C phase current setting value equal to an interphase distance impedance fixed value of a corresponding one of the first, second and third sections of the power transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to the preset second positive sequence sensitive angle, and the phase of the phase C current lags the phase of the phase C voltage according to the preset second positive sequence sensitive angle.

As shown in fig. 6, a further distance protection setting value field calibration method for a power transmission line of a power grid, provided in the embodiment of the present invention, is implemented on the distance protection setting value field calibration system for the power transmission line of the power grid, and the method includes the following steps:

step S31, acquiring a preset verification sequence in the relay protection outlet action loop, and sequentially determining that each of the three logic circuits is a logic circuit to be verified according to the preset verification sequence;

step S32, obtaining a protection state generated when the relay protection outlet action loop simultaneously loads A, B, C phase voltage setting value and A, B, C phase current setting value on each logic circuit to be verified, loads a grounding distance protection logic control command of 0 and an interphase distance protection logic control command of 1 to simulate ABC three-phase fault, and verifying that the actually loaded A, B, C phase voltage setting values required by the ABC three-phase fault of each logic circuit to be verified are equal, A, B, C phase current setting values are equal, and A, B, C phase voltage setting values are equal to 2 x 0.95 times of A phase current setting values or B phase current setting values or C phase current setting values and the interphase distance impedance fixed value of a corresponding one of the power transmission line I, II and III sections corresponding to the current logic circuit to be verified; the phase of the phase A current lags the phase of the phase A voltage according to a preset third positive sequence sensitive angle, and the phase of the phase B current lags the phase of the phase B voltage according to the preset third positive sequence sensitive angle; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset third positive sequence sensitive angle; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

The embodiment of the invention has the following beneficial effects:

It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. A distance protection setting value on-site calibration system of a power grid transmission line is characterized by being arranged on a relay protection device and comprising a relay protection outlet action loop and three logic circuits connected with the relay protection outlet action loop; wherein the content of the first and second substances,

2. The system of claim 1, wherein the relay protection outlet action loop verifies the actually loaded voltage setting value and current setting value of each logic circuit to be verified when each phase-to-ground fault or each phase-to-phase fault occurs by starting the protection action according to the correspondingly generated protection state.

3. The distance protection setting value on-site verification system of the power grid transmission line according to claim 2, wherein when each logic circuit to be verified loads the phase-A voltage setting value and the phase-A current setting value, loads the grounding distance protection logic control command of 1, and the phase-to-phase distance protection logic control command of 0 to simulate the phase-A grounding fault, the protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded phase-A voltage setting value required by the phase-A grounding fault of each logic circuit to be verified is verified to be equal to 0.95 times of the phase-A current setting value (1+ zero sequence compensation coefficient K) × the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags behind the phase of the phase A voltage according to a preset first positive sequence sensitive angle; the zero sequence compensation coefficient K is a constant; the fixed value of the impedance of the grounding distance of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

when each logic circuit to be verified is loaded with a B-phase voltage setting value and a B-phase current setting value, a grounding distance protection logic control command is loaded to be 1, and an interphase distance protection logic control command is loaded to be 0 to simulate a B-phase grounding fault, a protection state generated by the relay protection outlet action loop is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified, which is required by the actually loaded B-phase voltage setting value of each logic circuit to be verified and is equal to 0.95 times of the B-phase current setting value (1+ zero sequence compensation coefficient K), is verified; the phase of the phase B current lags behind the phase of the phase B voltage according to the preset first positive sequence sensitive angle;

when each logic circuit to be verified is loaded with a C-phase voltage setting value and a C-phase current setting value, and is loaded with a grounding distance protection logic control command of 1, and an interphase distance protection logic control command of 0 to simulate a C-phase grounding fault, a protection state generated by the relay protection outlet action loop is a protection action starting, and the grounding distance impedance fixed value of a corresponding one of the first, second and third sections of the power grid transmission line corresponding to the current logic circuit to be verified, wherein the C-phase voltage setting value required to be actually loaded by each logic circuit to be verified for the C-phase grounding fault is verified to be equal to 0.95 times of the C-phase current setting value (1+ zero-sequence compensation coefficient K); and the phase of the C-phase current lags behind the phase of the C-phase voltage according to the preset first positive sequence sensitive angle.

4. The distance protection setting value on-site verification system of the power grid transmission line according to claim 3, wherein the fixed value of the grounding distance impedance of the first section of the power grid transmission line is 7.1 ohms, the fixed value of the grounding distance impedance of the second section of the power grid transmission line is 11.05 ohms, and the fixed value of the grounding distance impedance of the third section of the power grid transmission line is 13.29 ohms.

5. The distance protection setting value on-site verification system of the power grid transmission line according to claim 2, wherein when each logic circuit to be verified simultaneously loads A, B phase voltage setting values and A, B phase current setting values, loads a grounding distance protection logic control command of 0 and an inter-phase distance protection logic control command of 1 to simulate an AB inter-phase fault, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that A, B phase voltage setting values actually loaded for the AB inter-phase fault of each logic circuit to be verified are equal, A, B phase current setting values are equal, and A, B phase voltage setting values are all equal to 2 x 0.95 times of A phase current setting value and equal to an inter-phase distance impedance fixed value of a corresponding one of the I, II and III sections of the power grid transmission line corresponding to the current logic circuit to be verified, or the A, B phase voltage setting values are all equal to 2 x 0.95 times of B phase current setting values and the interphase distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags behind the phase of the phase A voltage according to a preset second positive sequence sensitive angle, and the phase of the phase B current lags behind the phase of the phase B voltage according to the preset second positive sequence sensitive angle; the interphase distance impedance fixed value of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

when each logic circuit to be verified is loaded with B, C phase voltage setting values and B, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0 and an inter-phase distance protection logic control command is loaded to be 1 to simulate BC inter-phase faults, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that B, C phase voltage setting values needed to be actually loaded by the BC inter-phase faults of each logic circuit to be verified are equal, B, C phase current setting values are equal, B, C phase voltage setting values are all equal to 2 x 0.95 times of B phase current setting values and are equal to the inter-phase distance impedance setting value of a corresponding one of the first, second and third sections of the power grid power transmission line corresponding to the current logic circuit to be verified, or B, C phase voltage setting values are all equal to 2 x 0.95 times of C phase current setting values and are equal to 2 x 0.95 times of C phase current setting values, Setting the interphase distance impedance value of the corresponding one of the sections II and III; the phase of the phase C current lags behind the phase of the phase C voltage according to the preset second positive sequence sensitive angle, and the phase of the phase B current lags behind the phase of the phase B voltage according to the preset second positive sequence sensitive angle;

when each logic circuit to be verified is loaded with A, C phase voltage setting values and A, C phase current setting values at the same time, and a grounding distance protection logic control command is loaded to be 0 and an inter-phase distance protection logic control command is loaded to be 1 to simulate an AC inter-phase fault, a protection state generated by the relay protection outlet action loop is protection action starting, it is verified that A, C phase voltage setting values required to be actually loaded by the AC inter-phase fault of each logic circuit to be verified are equal, A, C phase current setting values are equal, A, C phase voltage setting values are equal to 2A phase current setting values 0.95 times of A phase current setting values of an inter-phase distance impedance fixed value of a corresponding one of the first, second and third sections of a power grid power transmission line corresponding to the current logic circuit to be verified, or A, C phase voltage setting values are equal to 2C phase current setting values 0.95 times of C phase current setting values of a power grid power transmission line corresponding to the current logic circuit to be verified, Setting the interphase distance impedance value of the corresponding one of the sections II and III; the phase of the phase A current lags behind the phase of the phase A voltage according to the preset second positive sequence sensitive angle, and the phase of the phase C current lags behind the phase of the phase C voltage according to the preset second positive sequence sensitive angle.

6. The distance protection setting value on-site verification system of the power grid transmission line according to claim 2, wherein when each logic circuit to be verified is loaded with A, B, C phase voltage setting values and A, B, C phase current setting values at the same time, and is loaded with 0 grounding distance protection logic control command and 1 phase-to-phase distance protection logic control command to simulate an ABC three-phase fault, the protection state generated by the relay protection outlet action loop is protection action starting, it is verified that A, B, C phase voltage setting values required to be actually loaded for the ABC three-phase fault of each logic circuit to be verified are equal, A, B, C phase current setting values are equal, and A, B, C phase voltage setting values are all equal to 2 x 0.95 times of A phase current setting value and equal to the phase-to-phase distance impedance fixed value of a corresponding one of the I, II and III sections of the power grid transmission line corresponding to the current logic circuit to be verified, or A, B, C phase voltage setting values are all equal to 2 x 0.95 time of B phase current setting values and the interphase distance impedance setting value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the logic circuit to be checked currently, or A, B, C phase voltage setting values are all equal to 2 x 0.95 time of C phase current setting values and the interphase distance impedance setting value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the logic circuit to be checked currently; the phase of the phase-A current lags behind the phase of the phase-A voltage according to a preset third positive sequence sensitive angle, and the phase of the phase-B current lags behind the phase of the phase-B voltage according to the preset third positive sequence sensitive angle; the phase of the C-phase current lags behind the phase of the C-phase voltage according to the preset third positive sequence sensitive angle; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.

7. The distance protection setting value field verification system of the power grid transmission line according to claim 5 or 6, wherein the interphase distance impedance constant value of the first section of the power grid transmission line is 7.1 ohms, the interphase distance impedance constant value of the second section of the power grid transmission line is 11.05 ohms, and the interphase distance impedance constant value of the third section of the power grid transmission line is 13.29 ohms.

8. A distance protection setting value field check method of a power grid transmission line, which is realized on the distance protection setting value field check system of the power grid transmission line according to claim 3 or 4, and comprises the following steps:

obtaining a protection state generated when each logic circuit to be verified is loaded with an A-phase voltage setting value and an A-phase current setting value, each logic circuit to be verified is loaded with a grounding distance protection logic control instruction of 1, and each interphase distance protection logic control instruction of 0 to simulate an A-phase grounding fault, and verifying that the actually loaded A-phase voltage setting value required by each logic circuit to be verified for the A-phase grounding fault is equal to 0.95 times of the A-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase A current lags behind the phase of the phase A voltage according to a preset first positive sequence sensitive angle; the zero sequence compensation coefficient K is a constant; the fixed value of the impedance of the grounding distance of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

acquiring a protection state generated when each logic circuit to be verified is loaded with a B-phase voltage setting value and a B-phase current setting value, a grounding distance protection logic control command is 1 and an interphase distance protection logic control command is 0 to simulate a B-phase grounding fault, and verifying that the actually loaded B-phase voltage setting value required by each logic circuit to be verified, which is connected with the ground fault, is equal to 0.95 times of the B-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase B current lags behind the phase of the phase B voltage according to the preset first positive sequence sensitive angle;

acquiring a protection state generated when each logic circuit to be verified is loaded with a C-phase voltage setting value and a C-phase current setting value, a grounding distance protection logic control command is 1 and an interphase distance protection logic control command is 0 to simulate a C-phase grounding fault by the relay protection outlet action loop, and verifying that the actually loaded C-phase voltage setting value required by each logic circuit to be verified for the C-phase grounding fault is equal to 0.95 times of the C-phase current setting value (1+ zero-sequence compensation coefficient K) and the grounding distance impedance fixed value of a corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; and the phase of the C-phase current lags behind the phase of the C-phase voltage according to the preset first positive sequence sensitive angle.

9. A distance protection setting value on-site verification method of a power grid transmission line, which is implemented on the distance protection setting value on-site verification system of the power grid transmission line according to claim 5 or 7, the method comprising the steps of:

the method comprises the steps that A, B phase voltage setting values and A, B phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1 to simulate an AB interphase fault, the protection state is protection action starting, it is verified that A, B phase voltage setting values needed to be actually loaded by the AB interphase fault of each logic circuit to be verified are equal, A, B phase current setting values are equal, A, B phase voltage setting values are equal to 2A phase current setting values 0.95 times of A phase current setting values, an interphase distance impedance fixed value of a corresponding one of power grid power transmission lines I, II and III sections corresponding to the current logic circuit to be verified, or A, B phase voltage setting values are equal to 2B phase current setting values 0.95 times of B phase current setting values, an interphase distance impedance fixed value of a corresponding power grid power transmission line I, II and III sections corresponding to the current logic circuit to be verified, and a power grid power transmission line I, B phase current, B phase distance impedance fixed values corresponding to be verified are verified, and a current circuit to be verified are verified, Setting the interphase distance impedance value of the corresponding one of the sections II and III; the phase of the phase A current lags behind the phase of the phase A voltage according to a preset second positive sequence sensitive angle, and the phase of the phase B current lags behind the phase of the phase B voltage according to the preset second positive sequence sensitive angle; the interphase distance impedance fixed value of each of the sections I, II and III of the power grid transmission line is a fixed measured value;

the method comprises the steps that B, C phase voltage setting values and B, C phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1 to simulate a BC interphase fault, the generated protection state is protection action starting, it is verified that B, C phase voltage setting values needed to be actually loaded by the BC interphase fault of each logic circuit to be verified are equal, B, C phase current setting values are equal, B, C phase voltage setting values are all equal to 2 x 0.95 times of B phase current setting values and are equal to an interphase distance impedance setting value of a corresponding one of power grid power transmission lines I, II and III sections corresponding to the current logic circuit to be verified, or B, C phase voltage setting values are all equal to 2 x 0.95 times of C phase current setting values and are corresponding to power grid power transmission lines I, II and III sections corresponding to the current logic circuit to be verified, and are equal to, Setting the interphase distance impedance value of the corresponding one of the sections II and III; the phase of the phase C current lags behind the phase of the phase C voltage according to the preset second positive sequence sensitive angle, and the phase of the phase B current lags behind the phase of the phase B voltage according to the preset second positive sequence sensitive angle;

the method comprises the steps that A, C phase voltage setting values and A, C phase current setting values are simultaneously loaded on each logic circuit to be verified by the relay protection outlet action loop, a grounding distance protection logic control command is loaded to be 0, an interphase distance protection logic control command is loaded to be 1 to simulate a protection state generated when an AC interphase fault is started to be a protection action, it is verified that A, C phase voltage setting values needed to be actually loaded for the AC interphase fault of each logic circuit to be verified are equal, A, C phase current setting values are equal, A, C phase voltage setting values are equal to 2A phase current setting values 0.95 times of A phase current setting values of an interphase distance impedance fixed value of a corresponding one of power grid power transmission lines I, II and III sections corresponding to the current logic circuit to be verified, or A, C phase voltage setting values are equal to 2C phase current setting values 0.95 times of C phase current setting values corresponding to power grid power transmission lines I, II and III sections corresponding to the current logic circuit to be verified, and the current logic circuit to be verified is verified, and the relay protection outlet action loop is started to be protected, Setting the interphase distance impedance value of the corresponding one of the sections II and III; the phase of the phase A current lags behind the phase of the phase A voltage according to the preset second positive sequence sensitive angle, and the phase of the phase C current lags behind the phase of the phase C voltage according to the preset second positive sequence sensitive angle.

10. A distance protection setting value on-site verification method of a power grid transmission line, which is implemented on the distance protection setting value on-site verification system of the power grid transmission line according to claim 6 or 7, the method comprising the steps of:

obtaining a protection state generated when each logic circuit to be verified of the relay protection outlet action loop is loaded with A, B, C phase voltage setting values and A, B, C phase current setting values at the same time, and is loaded with a grounding distance protection logic control instruction of 0 and an interphase distance protection logic control instruction of 1 to simulate an ABC three-phase fault, wherein the protection state is protection action starting, verifying that A, B, C phase voltage setting values required to be actually loaded by each logic circuit to be verified for ABC three-phase fault are equal, A, B, C phase current setting values are equal, A, B, C phase voltage setting values are all equal to 2A phase current setting values 0.95 times of an interphase distance impedance fixed value of a corresponding one of the first, second and third sections of a power grid power transmission line corresponding to the current logic circuit to be verified, or A, B, C phase voltage setting values are all equal to 2B phase current setting values 0.95 times of a phase current setting value corresponding to the first, second and third sections of the power grid power transmission line corresponding to the current logic circuit to be verified, and, The interphase distance impedance fixed value of the corresponding one of the sections II and III, or the A, B, C phase voltage set values are both equal to 2 x 0.95 times of the C-phase current set value and the interphase distance impedance fixed value of the corresponding one of the sections I, II and III of the power grid transmission line corresponding to the current logic circuit to be verified; the phase of the phase-A current lags behind the phase of the phase-A voltage according to a preset third positive sequence sensitive angle, and the phase of the phase-B current lags behind the phase of the phase-B voltage according to the preset third positive sequence sensitive angle; the phase of the C-phase current lags behind the phase of the C-phase voltage according to the preset third positive sequence sensitive angle; the interphase distance impedance fixed value of each of the I, II and III sections of the power grid transmission line is a fixed measured value.