CN110601129A - On-site calibration system and method for zero sequence protection setting value of power grid transmission line - Google Patents
On-site calibration system and method for zero sequence protection setting value of power grid transmission line Download PDFInfo
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- CN110601129A CN110601129A CN201910837923.5A CN201910837923A CN110601129A CN 110601129 A CN110601129 A CN 110601129A CN 201910837923 A CN201910837923 A CN 201910837923A CN 110601129 A CN110601129 A CN 110601129A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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Abstract
The invention provides a field calibration system for a zero sequence protection setting value of a power grid transmission line, which comprises a relay protection device and a logic protection switching control device; a relay protection outlet action loop and four zero sequence protection setting value simulation circuits are arranged in the relay protection device; the zero sequence protection setting value simulation circuit is used for realizing the simulation of each phase grounding fault on a corresponding one of the zero sequence sections I to IV by loading a fixed voltage setting value and various current setting values according to the preset fault simulation content; the relay protection outlet action loop selects one of the four zero sequence protection setting value simulation circuits in sequence as a logic circuit to be checked, loads a fixed voltage setting value and generates a corresponding protection state when various current setting value fault simulation is carried out to check the current setting value which is actually loaded when various phase-to-ground faults occur; and the logic protection switching control device performs verification and verification control. By implementing the method, the zero sequence protection setting value of the power grid transmission line can be quickly checked on site.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a system and a method for on-site checking of a zero sequence protection setting value of a power grid transmission line.
Background
For a power grid transmission line, there are various protection measures such as differential protection, distance protection and zero sequence protection. The zero sequence protection is a protection measure formed by the generation of zero sequence current when the power grid system has ground fault, and is particularly suitable for the condition that the power grid system does not act or loses selectivity due to the insufficient sensitivity of other types of protection devices when the power grid system generates small fault current through high-impedance grounding.
Generally, zero-sequence protection is divided into zero-sequence I-segment protection, zero-sequence II-segment protection, zero-sequence III-segment protection, and zero-sequence IV-segment protection. Because the power grid system does not have zero sequence current when in normal operation, the zero sequence protection is not influenced by load current, and the power grid system does not have zero sequence component when in oscillation, the zero sequence protection can not malfunction, thereby leading the zero sequence protection to become a more ideal protection in the protection of the power grid transmission line.
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. Therefore, it is necessary to check the zero sequence protection setting value of the power grid transmission line by whether the zero sequence protection action of the relay protection device is performed or not, and to find hidden dangers in time so as to ensure safe operation.
However, a method for gradually checking the zero-sequence protection setting value of the power grid power transmission line is still lacked at present, and particularly, the zero-sequence 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 system and a method for on-site checking zero sequence protection setting values of a power grid transmission line, which can check the zero sequence protection setting values of the power grid transmission line on-site by using whether zero sequence protection of a relay protection outlet action loop acts or not when a single-phase ground fault of the power grid transmission line is simulated, so as to find hidden dangers in time and provide guarantee for safe operation of the power grid transmission line.
In order to solve the technical problem, the embodiment of the invention provides a zero sequence protection setting value field check system for a power grid transmission line, which comprises a relay protection device and a preposed logic protection switching control device thereof; wherein,
a relay protection outlet action loop and four zero sequence protection setting value simulation circuits connected with the relay protection outlet action loop are arranged in the relay protection device; wherein,
each zero sequence protection setting value simulation circuit is used for realizing the simulation of each phase grounding fault on a corresponding one of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section by loading a fixed voltage setting value and various current setting values according to the preset fault simulation content on the relay protection device; each zero sequence protection setting value analog circuit comprises a first AND gate and a switch relay; the switch relay comprises three input ends and an output end, wherein one input end of the switch relay 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 input end of the switch relay 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 input end of the switch relay 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 of the switch relay; the first AND gate comprises two input ends and an output end, one input end of the first AND gate is connected with the output end of the switch relay, the other input end of the first AND gate is connected with the logic protection switching control device, and the output end of the first AND gate is connected with the relay protection outlet action loop;
the relay protection outlet action loop is used for sequentially selecting one of the four zero sequence protection setting value simulation circuits as a logic circuit to be verified, generating a corresponding protection state when each logic circuit to be verified loads a fixed voltage setting value and various current setting values according to the preset fault content to perform fault simulation, and further verifying a current setting value which is required to be actually loaded when each phase-to-ground fault occurs from the various 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 starting and protection action non-starting;
the logic protection switching control device comprises a second AND gate, and a zero sequence protection function hard pressing plate and a zero sequence protection setting value pressing plate which are respectively connected with two input ends of the second AND gate, and the output end of the second AND gate is connected with each zero sequence protection setting value analog circuit in the relay protection device; the logic protection switching control device is used for controlling the switching state controlled by the zero sequence protection function hard pressing plate and the zero sequence protection constant value pressing plate, and verifying the zero sequence protection function qualification realized on the relay protection device and the current setting value which is actually loaded and corresponds to each phase grounding fault after the zero sequence protection function hard pressing plate and the zero sequence protection constant value pressing plate are controlled to enter the switching state.
The relay protection outlet action loop is used for verifying a voltage setting value and a current setting value which are required to be actually loaded when each phase grounding fault occurs to each logic circuit to be verified through the protection action starting of the protection state generated correspondingly.
When each logic circuit to be verified is loaded with a fixed A-phase voltage setting value and various A-phase current setting values to simulate A-phase grounding faults, a protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded A-phase current setting value required by the A-phase grounding faults of each logic circuit to be verified is verified to be equal to 1.05 zero-sequence overcurrent setting values on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section 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 positive sequence sensitive angle preset on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
When each logic circuit to be checked is loaded with a fixed B-phase voltage setting value and various B-phase current setting values to simulate B-phase grounding faults, the protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded B-phase current setting value required by checking that each logic circuit to be checked is connected with the grounding faults is equal to 1.05 zero-sequence overcurrent setting values on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the phase B current lags the phase of the phase B voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
When each logic circuit to be checked is loaded with a fixed C-phase voltage setting value and various C-phase current setting values to simulate a C-phase grounding fault, a protection state generated by the relay protection outlet action loop is protection action starting, and the C-phase current setting value actually loaded for checking that each logic circuit to be checked is required to be actually loaded and is equal to 1.05 zero-sequence overcurrent setting values on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
The A-phase voltage setting value, the B-phase voltage setting value and the C-phase voltage setting value are equal and are 20V.
The embodiment of the invention also provides a field calibration method for the zero sequence protection setting value of the power grid transmission line, which is realized on the field calibration system for the zero sequence protection setting value of the power grid transmission line, and the method comprises the following steps:
acquiring fault simulation contents preset in a relay protection output device and logic circuits to be checked selected from four zero sequence protection setting value simulation circuits in sequence;
when a relay protection outlet action loop loads a fixed A-phase voltage setting value and various A-phase current setting values on each logic circuit to be verified to simulate A-phase grounding faults, the protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded A-phase current setting value required by the A-phase grounding faults of each logic circuit to be verified is verified to be equal to 1.05 times of the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section 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 positive sequence sensitive angle preset on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
when the relay protection outlet action loop is used for simulating a B-phase grounding fault by loading a fixed B-phase voltage setting value and various B-phase current setting values on each logic circuit to be verified, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded B-phase current setting value required by the B-phase grounding fault of each logic circuit to be verified is verified to be equal to 1.05 x of the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section 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 positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
when the relay protection outlet action loop is used for simulating a phase C grounding fault by loading a fixed phase C voltage setting value and various phase C current setting values on each logic circuit to be verified, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded phase C current setting value required by the phase C grounding fault of each logic circuit to be verified is verified to be equal to 1.05 times of the zero-sequence overcurrent setting value on the corresponding one of the phase I section, the phase II section, the phase III section and the phase IV section corresponding to the current logic circuit to be verified; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
The A-phase voltage setting value, the B-phase voltage setting value and the C-phase voltage setting value are equal and are 20V.
The embodiment of the invention has the following beneficial effects:
the invention realizes the simulation of the ground fault of each phase on the corresponding one of the zero sequence I section, the II section, the III section and the IV section by loading various voltage setting values and current setting values on each zero sequence protection setting value simulation circuit, and verifies the current setting value through the zero sequence protection action of the relay protection outlet action circuit, thereby finding hidden troubles 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 described 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 creative efforts.
Fig. 1 is a schematic structural diagram of a zero sequence protection setting value field check system of a power grid transmission line according to an embodiment of the present invention;
fig. 2 is a schematic diagram of logical connection between a relay loaded with a voltage setting value and a current setting value and a switching relay in a single zero-sequence protection setting value analog circuit in fig. 1;
FIG. 3 is a schematic diagram of the operation of FIG. 1;
fig. 4 is a flowchart of a field calibration method for zero sequence protection setting values of a power grid transmission line 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 to fig. 3, in an embodiment of the present invention, the system for on-site checking a zero-sequence protection setting value of a power transmission line of a power grid includes a relay protection device 1 and a preposed logic protection switching control device 2; wherein,
a relay protection outlet action loop 11 and four zero-sequence protection setting value simulation circuits 12 connected with the relay protection outlet action loop 11 are arranged in the relay protection device 1; wherein,
each zero-sequence protection setting value simulation circuit 12 is used for realizing the simulation of each phase grounding fault on a corresponding one of the zero-sequence sections I, II, III and IV by loading a fixed voltage setting value (such as 20V) and various current setting values according to the fault simulation content preset on the relay protection device 1; each zero-sequence protection setting value analog circuit 12 comprises a first and gate M1 and a switch relay BCJ; the switching relay BCJ comprises three input ends and an output end, wherein one input end of the switching relay BCJ is connected in series with two relays (such as 1YL and 1LJ in fig. 2) which are respectively loaded with an A-phase voltage setting value and an A-phase current setting value, the other input end of the switching relay BCJ is connected in series with two relays (such as 2YJ and 2LJ in fig. 2) which are respectively loaded with a B-phase voltage setting value and a B-phase current setting value, the last input end of the switching relay BCJ is connected in series with two relays (such as 3YJ and 3LJ in fig. 2) which are respectively loaded with a C-phase voltage setting value and a C-phase current; the first and gate M1 includes two input ends and an output end, one input end is connected with the output end of the switch relay BCJ, the other input end is connected with the logic protection switching control device 2, and the output end is connected with the relay protection outlet action loop 11;
a relay protection outlet action loop 11, configured to select one of the four zero-sequence protection setting value simulation circuits 12 in sequence as a logic circuit to be verified, generate a corresponding protection state when each logic circuit to be verified loads a fixed voltage setting value and various current setting values according to preset fault content to perform fault simulation, and further verify, according to the corresponding generated protection state, a current setting value that needs to be actually loaded when a fault corresponding to each phase occurs from the various current setting values loaded by each logic circuit to be verified; the protection state comprises protection action starting and protection action non-starting;
the logic protection switching control device 2 comprises a second AND gate M2, and a zero sequence protection function hard pressing plate T1 and a zero sequence protection setting value pressing plate T2 which are respectively connected with two input ends of a second AND gate M2, wherein the output end of the second AND gate M2 is connected with each zero sequence protection setting value analog circuit 12 in the relay protection device 1; and the logic protection switching control device 2 is used for controlling switching states controlled by the zero-sequence protection function hard pressing plate T1 and the zero-sequence protection fixed value pressing plate T2, and verifying the zero-sequence protection function qualification realized on the electric protection device 1 and the current setting value which is actually loaded and corresponds to each ground fault after the zero-sequence protection function hard pressing plate T1 and the zero-sequence protection fixed value pressing plate T2 are controlled to enter the switching states.
It should be noted that the zero sequence protection function hard pressure plate T1 in the logic protection switching control device 2 is an entity connection plate, and is controlled by the relay protection device 1 to enter the switching-in or switching-out state, while the zero sequence protection constant pressure plate T2 is a logic soft pressure plate, and is controlled by the logic instruction of the remote microcomputer to enter the switching-in or switching-out state, if the switching-in setting value is 1, the switching-out setting value is 0. Meanwhile, the logic protection switching control device 2 distinguishes zero sequence protection from distance protection and differential protection, and guarantees the rationality and the qualification of verification.
It should be noted that, when each logic circuit to be verified simulates each phase-to-ground fault, the relay protection outlet operation loop 11 verifies the current setting value that is actually loaded when each phase-to-ground fault occurs in each logic circuit to be verified by using the correspondingly generated protection state as the protection operation start. Of course, the relay protection outlet action loop 11 may also check the current setting value actually loaded by each logic circuit to be checked when each phase ground fault occurs by controlling the audible and visual alarm when each logic circuit to be checked simulates that each phase ground fault occurs.
In the embodiment of the present invention, each of the zero sequence I segment, the zero sequence II segment, the zero sequence III segment, and the zero sequence IV segment includes A, B, C-phase single-phase ground faults, so a checking method for checking an actual current setting value corresponding to any one of the zero sequence I segment, the zero sequence II segment, the zero sequence III segment, and the zero sequence IV segment when each phase ground fault occurs needs to be specifically as follows:
(1) phase a ground fault: when each logic circuit to be checked is loaded with a fixed A-phase voltage setting value (such as 20V) and various A-phase current setting values to simulate A-phase grounding faults, a protection state generated by a relay protection outlet action loop 11 is used as protection action starting, and the actually loaded A-phase current setting value required by each logic circuit to be checked for A-phase grounding faults is checked to be equal to 1.05 times of a zero-sequence overcurrent setting value on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the phase a current should lag the phase of the phase a voltage according to a positive sequence sensitive angle preset on the relay protection device 1, where the positive sequence sensitive angle is a fixed value, such as 71 degrees; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
It should be noted that when other phase-to-ground faults occur in the following, the same positive sequence sensitive angle and the same corresponding zero sequence overcurrent fixed values on the zero sequence I section, the zero sequence II section, the zero sequence III section, and the zero sequence IV section in the phase-to-ground fault are adopted, and details are not described below.
(2) Phase B ground fault: when each logic circuit to be checked is loaded with a fixed B-phase voltage setting value (such as 20V) and various B-phase current setting values to simulate a B-phase grounding fault, a protection state generated by a relay protection outlet action loop 11 is used as protection action starting, and the actually loaded B-phase current setting value required by the actual loading of the B-phase grounding fault of each logic circuit to be checked is checked to be equal to 1.05 times of a zero-sequence overcurrent setting value on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the phase B current lags the phase of the phase B voltage according to a positive sequence sensitive angle preset on the relay protection device 1; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
(3) Phase C ground fault: when each logic circuit to be checked is loaded with a fixed C-phase voltage setting value (such as 20V) and various C-phase current setting values to simulate a C-phase grounding fault, a protection state generated by a relay protection outlet action loop 11 is used as protection action starting, and the actually loaded C-phase current setting value required by the C-phase grounding fault of each logic circuit to be checked is checked to be equal to 1.05 to a zero-sequence overcurrent setting value on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the phase C current lags the phase of the phase C voltage according to a positive sequence sensitive angle preset on the relay protection device 1; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
In the embodiment of the invention, the correctness of the current setting value corrected by the relay protection outlet action loop 11 when each fault occurs can be further proved by changing the multiple of the current setting value, the sensitive angle of the current hysteresis voltage and other modes.
Based on the working schematic diagram of fig. 3, an application scenario of the zero sequence protection setting value field calibration system of the power grid transmission line in the embodiment of the present invention is further explained by taking the simulated zero sequence II segment as an example:
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, controlling both a zero-sequence protection function hard pressing plate and a zero-sequence protection constant value pressing plate to enter a putting state; the zero-sequence protection constant value pressure plate enters an input state by setting a protection constant value control word 1;
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;
and then, simulating a positive direction single-phase ground fault, and loading an A-phase voltage of 20V, wherein the A-phase current is equal to 1.05 times of a zero-sequence overcurrent fixed value on a zero-sequence II section corresponding to the current logic circuit to be verified. The angle of the phase A current lagging the phase A voltage at the moment is a positive sequence sensitive angle (such as 71 degrees) in the relay protection device fixed value, and the phase A single phase is simulated to be grounded and successfully superposed. Namely, the time of the fault state is set to be 50ms, a period of positive sequence rated voltage is added after 50ms of the fault state, the time is greater than the setting time of the reclosing of the device, single trip is protected and reclosing is carried out, corresponding tripping lamps on a panel of the relay protection device are turned on, the reclosing lamps are turned on, zero sequence II section protection action is displayed on a liquid crystal, and the action time is 15-25 ms.
Finally, verification is performed.
1) Controlling one or both of the zero-sequence protection function hard pressing plate and the zero-sequence protection fixed value pressing plate to enter an exit state, but not starting the protection action of a relay protection outlet action loop;
2) keeping the zero-sequence protection function hard pressing plate and the zero-sequence protection fixed value pressing plate to be controlled to enter a putting state, loading an A-phase voltage of 20V, wherein the A-phase current is equal to 0.95 × a zero-sequence overcurrent fixed value on a zero-sequence II section corresponding to a current logic circuit to be verified, but the relay protection outlet action circuit is not started to perform protection action;
3) and keeping the zero-sequence protection function hard pressing plate and the zero-sequence protection fixed value pressing plate to be controlled to enter an input state, simultaneously keeping the A-phase voltage to be loaded at 20V, keeping the A-phase current equal to 1.05 multiplied by the zero-sequence overcurrent fixed value on the zero-sequence II section corresponding to the current logic circuit to be verified, and keeping the A-phase current lagging the angle of the A-phase voltage by 180 degrees on the basis of the positive direction sensitive angle, but the protection action of the relay protection outlet action loop is not started.
By analogy, the steps are repeated to realize B, C checking of the current setting value in the phase-to-ground fault.
As shown in fig. 4, in an embodiment of the present invention, the method for field calibration of the zero sequence protection setting value of the power transmission line of the power grid is implemented on the field calibration system of the zero sequence protection setting value of the power transmission line of the power grid, and the method includes the following steps:
step S11, acquiring fault simulation content preset in the relay protection device and logic circuits to be checked selected in sequence from four zero sequence protection setting value simulation circuits;
step S12, when a relay protection outlet action loop loads a fixed A-phase voltage setting value and various A-phase current setting values on each logic circuit to be verified to simulate A-phase grounding faults, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded A-phase current setting value required by the A-phase grounding faults of each logic circuit to be verified is verified to be equal to 1.05 which is the zero-sequence overcurrent setting value on the corresponding one of the current zero-sequence I section, the current zero-sequence II section, the current III section and the current IV section 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 positive sequence sensitive angle preset on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
step S13, when a fixed B-phase voltage setting value and various B-phase current setting values loaded by each logic circuit to be verified by the relay protection outlet action loop are obtained to simulate a B-phase grounding fault, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded B-phase current setting value required by the B-phase grounding fault of each logic circuit to be verified is verified to be equal to 1.05 which is the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section 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 positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
step S14, when a fixed C-phase voltage setting value and various C-phase current setting values loaded by each logic circuit to be verified by the relay protection outlet action loop are obtained to simulate a C-phase grounding fault, the protection state generated by the relay protection outlet action loop is a protection action start, and the C-phase current setting value actually loaded by each logic circuit to be verified, which is required by the C-phase grounding fault, is verified to be equal to 1.05 which is the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section corresponding to the current logic circuit to be verified; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
The A-phase voltage setting value, the B-phase voltage setting value and the C-phase voltage setting value are equal and are 20V.
The embodiment of the invention has the following beneficial effects:
the invention realizes the simulation of the ground fault of each phase on the corresponding one of the zero sequence I section, the II section, the III section and the IV section by loading various voltage setting values and current setting values on each zero sequence protection setting value simulation circuit, and verifies the current setting value through the zero sequence protection action of the relay protection outlet action circuit, thereby finding hidden troubles in time and providing guarantee for the safe operation of the power grid transmission line.
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 (8)
1. A field calibration system for a zero sequence protection setting value of a power grid transmission line is characterized by comprising a relay protection device and a preposed logic protection switching control device thereof; wherein,
a relay protection outlet action loop and four zero sequence protection setting value simulation circuits connected with the relay protection outlet action loop are arranged in the relay protection device; wherein,
each zero sequence protection setting value simulation circuit is used for realizing the simulation of each phase grounding fault on a corresponding one of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section by loading a fixed voltage setting value and various current setting values according to the preset fault simulation content on the relay protection device; each zero sequence protection setting value analog circuit comprises a first AND gate and a switch relay; the switch relay comprises three input ends and an output end, wherein one input end of the switch relay 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 input end of the switch relay 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 input end of the switch relay 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 of the switch relay; the first AND gate comprises two input ends and an output end, one input end of the first AND gate is connected with the output end of the switch relay, the other input end of the first AND gate is connected with the logic protection switching control device, and the output end of the first AND gate is connected with the relay protection outlet action loop;
the relay protection outlet action loop is used for sequentially selecting one of the four zero sequence protection setting value simulation circuits as a logic circuit to be verified, generating a corresponding protection state when each logic circuit to be verified loads a fixed voltage setting value and various current setting values according to the preset fault content to perform fault simulation, and further verifying a current setting value which is required to be actually loaded when each phase-to-ground fault occurs from the various 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 starting and protection action non-starting;
the logic protection switching control device comprises a second AND gate, and a zero sequence protection function hard pressing plate and a zero sequence protection setting value pressing plate which are respectively connected with two input ends of the second AND gate, and the output end of the second AND gate is connected with each zero sequence protection setting value analog circuit in the relay protection device; the logic protection switching control device is used for controlling the switching state controlled by the zero sequence protection function hard pressing plate and the zero sequence protection constant value pressing plate, and verifying the zero sequence protection function qualification realized on the relay protection device and the current setting value which is actually loaded and corresponds to each phase grounding fault after the zero sequence protection function hard pressing plate and the zero sequence protection constant value pressing plate are controlled to enter the switching state.
2. The on-site zero-sequence protection setting value checking system for the power grid transmission line according to claim 1, wherein the relay protection outlet action loop checks a voltage setting value and a current setting value which are actually loaded when each phase ground fault occurs to each logic circuit to be checked by starting a protection action according to a correspondingly generated protection state.
3. The on-site zero-sequence protection setting value checking system of the power grid transmission line according to claim 2, characterized in that when each logic circuit to be checked is loaded with a fixed a-phase voltage setting value and various a-phase current setting values to simulate a-phase grounding fault, the protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded a-phase current setting value required by checking that the a-phase grounding fault of each logic circuit to be checked is equal to 1.05 which is the zero-sequence overcurrent setting value on a corresponding one of the current zero-sequence I section, the current II section, the current III section and the current IV section corresponding to the current logic circuit to be checked; the phase of the phase A current lags the phase of the phase A voltage according to a positive sequence sensitive angle preset on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
4. The on-site zero-sequence protection setting value checking system of the power grid transmission line according to claim 3, characterized in that when each logic circuit to be checked is loaded with a fixed B-phase voltage setting value and various B-phase current setting values to simulate a B-phase grounding fault, the protection state generated by the relay protection outlet action loop is protection action starting, and the actually loaded B-phase current setting value required by the actual loading of the B-phase grounding fault of each logic circuit to be checked is checked to be equal to 1.05 zero-sequence overcurrent setting values on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the phase B current lags the phase of the phase B voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
5. The on-site zero-sequence protection setting value checking system of the power grid transmission line according to claim 4, characterized in that when each logic circuit to be checked is loaded with a fixed C-phase voltage setting value and various C-phase current setting values to simulate a C-phase grounding fault, the protection state generated by the relay protection outlet action loop is the protection action starting, and the C-phase current setting value actually loaded for checking that each logic circuit to be checked is required to be equal to 1.05 which is the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section corresponding to the current logic circuit to be checked; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
6. The on-site zero sequence protection setting value checking system for the power grid transmission line according to claim 5, wherein the A-phase voltage setting value, the B-phase voltage setting value and the C-phase voltage setting value are all equal and are 20V.
7. A power grid transmission line zero sequence protection setting value on-site verification method is realized on the power grid transmission line zero sequence protection setting value on-site verification system according to claim 6, and the method comprises the following steps:
acquiring fault simulation contents preset in a relay protection output device and logic circuits to be checked selected from four zero sequence protection setting value simulation circuits in sequence;
when the relay protection outlet action loop is used for simulating an A-phase grounding fault by loading a fixed A-phase voltage setting value and various A-phase current setting values on each logic circuit to be verified, a protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded A-phase current setting value required by the A-phase grounding fault of each logic circuit to be verified is verified to be equal to 1.05 times of a zero-sequence overcurrent setting value on a corresponding one of a zero-sequence I section, a zero-sequence II section, a zero-sequence III section and a zero-sequence IV section 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 positive sequence sensitive angle preset on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
when the relay protection outlet action loop is used for simulating a B-phase grounding fault by loading a fixed B-phase voltage setting value and various B-phase current setting values on each logic circuit to be verified, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded B-phase current setting value required by the B-phase grounding fault of each logic circuit to be verified is verified to be equal to 1.05 x of the zero-sequence overcurrent setting value on the corresponding one of the zero-sequence I section, the zero-sequence II section, the zero-sequence III section and the zero-sequence IV section 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 positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value;
when the relay protection outlet action loop is used for simulating a phase C grounding fault by loading a fixed phase C voltage setting value and various phase C current setting values on each logic circuit to be verified, the protection state generated by the relay protection outlet action loop is used as protection action starting, and the actually loaded phase C current setting value required by the phase C grounding fault of each logic circuit to be verified is verified to be equal to 1.05 times of the zero-sequence overcurrent setting value on the corresponding one of the phase I section, the phase II section, the phase III section and the phase IV section corresponding to the current logic circuit to be verified; the phase of the C-phase current lags the phase of the C-phase voltage according to the preset positive sequence sensitive angle on the relay protection device; the zero sequence overcurrent fixed value of each of the zero sequence I section, the zero sequence II section, the zero sequence III section and the zero sequence IV section is a fixed measured value.
8. The on-site calibration method for the zero sequence protection setting value of the power grid transmission line according to claim 7, wherein the A-phase voltage setting value, the B-phase voltage setting value and the C-phase voltage setting value are all equal and are 20V.
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