CN112858958A - Method for detecting current wiring polarity of high-backup-power-transformation protection device - Google Patents
Method for detecting current wiring polarity of high-backup-power-transformation protection device Download PDFInfo
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- CN112858958A CN112858958A CN202110007322.9A CN202110007322A CN112858958A CN 112858958 A CN112858958 A CN 112858958A CN 202110007322 A CN202110007322 A CN 202110007322A CN 112858958 A CN112858958 A CN 112858958A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The application discloses a method for detecting the current wiring polarity of a high-standby-transformer protection device, which comprises the following steps of: s1, preparing two test short-circuit trolleys, connecting one test short-circuit trolley into a large-current generator, introducing analog load current, and taking secondary current of the branched current transformer as a reference side; and S2, pushing another test short-circuit trolley into the spare incoming line switch, and switching the reference branch to the high-standby power transformer to run after the high-standby power transformer transmits power by using the simulated primary current S3 so as to start the high-power motor. The polarity check test of the high backup transformer protection low-voltage side secondary current loop can be completed through a simulation primary current test, the test result meets the requirement, the purpose of an expected test is achieved, the test steps are reduced, the test risk is reduced, the workload of operators and maintainers is reduced, the test efficiency is improved, and the test cost is effectively saved.
Description
Technical Field
The application relates to the technical field of electrical protection devices, in particular to a method for detecting the current wiring polarity of a high-standby-power-supply-ratio protection device.
Background
The high-backup power transformer is important power transmission and transformation equipment of a power station, differential protection is used as main protection of the high-backup power transformer, integrity and polarity correctness of differential protection current loop wiring must be verified before the high-backup power transformer is put into operation and after equipment transformation, and the high-backup power transformer can be put into use after the integrity and polarity correctness are ensured. Otherwise, the protection may be mistaken in normal operation of the equipment due to wiring polarity errors, so that the standby power supply is lost; or the high backup power equipment fails to work, so that the equipment is burnt and damaged, and the power grid is greatly damaged. Therefore, when the high backup protection is newly put into operation or modified, the wiring polarity check is performed by using a load current once, which is one of important test items.
The high backup transformer protection belt load test is an important method for verifying the wiring correctness of the protection device and the secondary circuit, under the normal condition, the load test is to utilize the actual load current to verify the differential protection according to the normal steps, because the low-voltage side of the high backup transformer protection has more branches, a plurality of units are involved, the switching operation steps in the test process are various, the workload and the risk are also large, the consumed time is more, and the test efficiency is not high.
Disclosure of Invention
The invention aims to provide a method for detecting the current wiring polarity of a high-backup-power-conversion protection device, which aims to solve the problems of various operation steps, large workload, high risk and low efficiency in the prior art.
A method for detecting the current wiring polarity of a high-backup-power-transformation protection device comprises the following steps:
s1, preparing two test short-circuit trolleys, connecting one test short-circuit trolley into a large-current generator, introducing analog load current, and taking secondary current of the branched current transformer as a reference side;
s2, pushing another test short-circuit trolley into the spare incoming switch, checking the polarity relationship and loop integrity of secondary current of each side CT of high-voltage and spare-voltage differential protection low-voltage by using simulated primary current, comparing the polarity relationship of the secondary current of each side CT with the secondary current of a reference side CT, adding simulated current according to the current direction, assuming that the secondary current of the reference branch side is 0 degrees, comparing the secondary current with the reference side, measuring the secondary current of other branch sides to be 180 degrees by using a pincerlike phase table, if the measurement result is consistent with the prediction, indicating that the wiring of the secondary current loop of each branch is correct, and if the measured secondary current angle of a certain branch side is inconsistent with the prediction, indicating that the wiring of the secondary current loop of the branch has a problem and needs to be checked and corrected;
and S3, after the high-standby transformer is powered on, switching the reference branch to high-standby transformer operation, starting the high-power motor, checking the secondary current polarity relationship between the high-voltage side of the high-standby transformer protection and the reference branch by using the motor starting current, and judging the wiring correctness and integrity of the protected current secondary circuit as long as the secondary current polarity relationship between the reference branch side and the high-voltage side is correct.
Preferably, in S1, the ABC three-phase shorting plate of one of the test trolleys is detached and connected to the three-phase test leads of the large-current generator respectively.
Preferably, the monitoring and inspection of the corresponding primary and secondary equipment are carried out in the checking process, and the test is stopped immediately when an abnormality is found.
Preferably, each through-flow time is controlled within 15 minutes, and the interval time is 10 minutes.
Preferably, after each check is completed, the current of the high-current generator is reduced to 0, and the test power supply is disconnected.
Preferably, the step S1 further includes:
s1.1, pushing one of the test trolleys into a 4A section of standby incoming line switch interval by an operator, and shaking to a working position;
s1.2, pushing the other test trolley into the 4B section standby incoming line switch interval by an operator, shaking to a working position, and closing a switch cabinet door;
s1.3, after the tester checks that the test is correct, starting a large current generator, introducing current to one test trolley of the 4A standby incoming lines, and slowly increasing the test current to 30A; closely monitoring whether the No. 01 high standby transformer body and the closed bus are abnormal or not, monitoring whether the interval of the 4A/4B standby incoming lines is abnormal or not, monitoring the heating condition of the test lead, and immediately stopping through-flow when the abnormality is found;
s1.4, checking the current amplitude, the phase and the differential current of the secondary side of the CT of the high backup protection 4A \4B branch channel, and making data records; after the checking is finished, reducing the current of the large-current generator to 0, and disconnecting the test power supply;
s1.5, pulling the two test trolleys out of the standby incoming line switch at intervals, and checking whether the test trolleys are abnormal or not;
s1.6, pushing one test trolley into the spare incoming line switch interval of the 4A section again;
s1.7, sequentially transporting the other test trolley to a No. 1-3 machine 6kV power distribution room; according to the steps, the polarity of the protection secondary current of the 1A \1B \2A \2B \3A \3B branch is checked in sequence, and data recording is made;
s1.8, pushing a second-stage shutdown power supply inlet wire switch into a working position and closing;
s1.9, pushing the other test trolley into a 5A1 standby incoming line switch interval in a 6kV power distribution room of a No. 5 machine, starting a large current generator after a tester checks that the test trolley is correct, introducing current into the 4A standby incoming line test trolley, and slowly increasing the test current to 80A;
s1.10, checking the current amplitude, the phase and the differential current of the secondary side of the CT of a 4A \ secondary branch channel with high backup protection; checking the current amplitude, phase and differential flow of the secondary side of the CT of the secondary shutdown power supply protection power supply side \5A1 branch channel; making data records; after checking, pulling out the other test trolley by 5A1 spare incoming line switch interval;
s1.11, opening a second-stage shutdown power supply incoming line switch;
s1.12, analyzing and checking the correctness of the secondary side current polarity of each branch CT of each 6kV section of the high-backup low-voltage side according to the test data, adjusting the wiring polarity of the current secondary circuit if the polarity is found to be incorrect, and rechecking according to the steps.
Preferably, in the S1.3, if the secondary current precision is not enough, the test current can be increased to 30A, and can be increased to 50A; in S1.9, if the secondary current precision is not enough, the test current is increased to 80A, and the test current can be increased to 100A.
Preferably, the step S2 further includes:
s2.1, exiting high-standby transformer differential protection, and taking No. 01 high-standby transformer 5001 switch overcurrent protection as transformer main protection;
s2.2, connecting a portable fault recorder to the first set of high backup transformer protection screen differential CT loop;
s2.3, before switching the high-voltage station power supply, checking the working state of the quick switching device, and measuring the secondary voltage value and the phase angle value of the incoming line of the 6kV working power supply and the incoming line of the standby power supply, wherein the secondary voltage value and the phase angle value both meet the requirement of synchronous switching;
s2.4, normal switching: an operator manually switches the 6kV 4A section working bus from a working power supply to a standby power supply on a console, and the checking equipment is free of abnormality;
s2.5, starting a 4A tracking pump by an operator, recording protection current waves during starting, and checking the polarity of the differential protection CT of the first set of high-standby transformer protection screen;
s2.6, checking parameters such as voltage, current and power of measurement loops such as a high-backup-transformer gateway electric energy meter and a transmitter, and making data records;
s2.7, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the first set of high backup power transformation protection screen;
s2.8, inputting a first set of high-standby-ratio protection screen differential protection after the protection polarity is confirmed to be correct;
s2.9, connecting a portable fault recorder to the second set of high-standby transformer protection screen differential CT loop;
s2.10, starting the 4A circulation pump switch again when the time interval from the last circulation pump starting is more than 10 minutes, and checking the polarity of the differential protection CT of the second set of high-standby variable protection screen;
s2.11, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the second set of high-standby power-variable protection screen;
s2.12, after the verification protection is normal, a second set of high-standby-power-transformation protection screen differential protection is put into use, and no abnormality is observed;
s2.13, manually switching the 6kV 4A section from the standby power supply to the working power supply by an operator;
s2.14, pulling the No. 01 high-standby transformer 5001 switch open, and finishing the polarity check work of the high-standby transformer differential protection current.
Preferably, in S2.5 and S2.10, parameters such as voltage, current, differential current and the like for checking the first set of high-standby variable protection panel protection device and the second set of high-standby variable protection panel protection device are provided.
Preferably, the high reserve No. 01 and 6kV 4A sections must be monitored by a special person during the test.
The invention has the beneficial effects that: after the novel installation, transformation or overhaul of the high backup transformer protection, the polarity of the differential protection needs to be checked and verified, after the novel method is used, the polarity check test of the low-voltage side secondary current loop of the high backup transformer protection can be completed by simulating a primary current test, the test result meets the requirement, the purpose of an expected test is achieved, the test time is reduced from 24 hours to 6 hours, the test steps are reduced, the test risk is reduced, the workload of operators and maintainers is reduced, the test efficiency is improved, and the test cost is effectively saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a diagram of a primary through-current test system for backup protection according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, a method for detecting a current wiring polarity of a high standby transformer protection device includes the following steps:
s1, preparing two test short-circuit trolleys, connecting one of the test short-circuit trolleys into a large-current generator, introducing analog load current, taking the secondary current of the branched current transformer as a reference side, disassembling the ABC three-phase short-circuit plate of one of the test trolleys, and respectively connecting the ABC three-phase short-circuit plate into three-phase test leads of the large-current generator;
s2, pushing another test short-circuit trolley into the spare incoming switch, checking the polarity relationship and loop integrity of secondary current of each side CT of high-voltage and spare-voltage differential protection low-voltage by using simulated primary current, comparing the polarity relationship of the secondary current of each side CT with the secondary current of a reference side CT, adding simulated current according to the current direction, assuming that the secondary current of the reference branch side is 0 degrees, comparing the secondary current with the reference side, measuring the secondary current of other branch sides to be 180 degrees by using a pincerlike phase table, if the measurement result is consistent with the prediction, indicating that the wiring of the secondary current loop of each branch is correct, and if the measured secondary current angle of a certain branch side is inconsistent with the prediction, indicating that the wiring of the secondary current loop of the branch has a problem and needs to be checked and corrected;
and S3, after the high-standby transformer is powered on, switching the reference branch to high-standby transformer operation, starting the high-power motor, checking the secondary current polarity relationship between the high-voltage side of the high-standby transformer protection and the reference branch by using the motor starting current, and judging the wiring correctness and integrity of the protected current secondary circuit as long as the secondary current polarity relationship between the reference branch side and the high-voltage side is correct.
And (3) monitoring and patrolling corresponding primary and secondary equipment in the checking process, immediately stopping the test when an abnormality is found, controlling the current flowing time to be within 15 minutes every time at intervals of 10 minutes, reducing the current of the large-current generator to 0 after the checking is finished every time, and disconnecting the test power supply.
The step of S1 further includes:
s1.1, pushing one of the test trolleys into a 4A section of standby incoming line switch interval by an operator, and shaking to a working position;
s1.2, pushing the other test trolley into the 4B section standby incoming line switch interval by an operator, shaking to a working position, and closing a switch cabinet door;
s1.3, after the tester checks that the fault is not found, starting a large current generator, introducing current to one test trolley of the 4A standby incoming lines, and slowly increasing the test current to 30A (the secondary current precision is not enough and can be increased to 50A); closely monitoring whether the No. 01 high standby transformer body and the closed bus are abnormal or not, monitoring whether the interval of the 4A/4B standby incoming lines is abnormal or not, monitoring the heating condition of the test lead, and immediately stopping through-flow when the abnormality is found;
s1.4, checking the current amplitude, the phase and the differential current of the secondary side of the CT of the high backup protection 4A \4B branch channel, and making data records; after the checking is finished, reducing the current of the large-current generator to 0, and disconnecting the test power supply;
s1.5, pulling the two test trolleys out of the standby incoming line switch at intervals, and checking whether the test trolleys are abnormal or not;
s1.6, pushing one test trolley into the spare incoming line switch interval of the 4A section again;
s1.7, sequentially transporting the other test trolley to a No. 1-3 machine 6kV power distribution room; according to the steps, the polarity of the protection secondary current of the 1A \1B \2A \2B \3A \3B branch is checked in sequence, and data recording is made;
s1.8, pushing a second-stage shutdown power supply inlet wire switch into a working position and closing;
s1.9, pushing the other test trolley into a 5A1 standby incoming line switch interval in a 6kV distribution room of a No. 5 machine, starting a large current generator after a tester checks that the test trolley is correct, introducing current into the 4A standby incoming line test trolley, and slowly increasing the test current to 80A (if the secondary current accuracy is not enough, the secondary current accuracy can be improved to 100A);
s1.10, checking the current amplitude, the phase and the differential current of the secondary side of the CT of a 4A \ secondary branch channel with high backup protection; checking the current amplitude, phase and differential flow of the secondary side of the CT of the secondary shutdown power supply protection power supply side \5A1 branch channel; making data records; after checking, pulling out the other test trolley by 5A1 spare incoming line switch interval;
s1.11, opening a second-stage shutdown power supply incoming line switch;
s1.12, analyzing and checking the correctness of the secondary side current polarity of each branch CT of each 6kV section of the high-backup low-voltage side according to the test data, adjusting the wiring polarity of the current secondary circuit if the polarity is found to be incorrect, and rechecking according to the steps.
The step of S2 further includes:
s2.1, exiting high-standby transformer differential protection, and taking No. 01 high-standby transformer 5001 switch overcurrent protection as transformer main protection;
s2.2, connecting a portable fault recorder to the first set of high backup transformer protection screen differential CT loop;
s2.3, before switching the high-voltage station power supply, checking the working state of the quick switching device, and measuring the secondary voltage value and the phase angle value of the incoming line of the 6kV working power supply and the incoming line of the standby power supply, wherein the secondary voltage value and the phase angle value both meet the requirement of synchronous switching;
s2.4, normal switching: an operator manually switches the 6kV 4A section working bus from a working power supply to a standby power supply on a console, and the checking equipment is free of abnormality;
s2.5, starting a 4A tracking pump by an operator, recording protective current recording during starting, checking the polarity of the differential protection CT of the first set of high-standby variable protection screen, and checking parameters such as voltage, current and differential current of a first set of high-standby variable protection screen protection device;
s2.6, checking parameters such as voltage, current and power of measurement loops such as a high-backup-transformer gateway electric energy meter and a transmitter, and making data records;
s2.7, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the first set of high backup power transformation protection screen;
s2.8, inputting a first set of high-standby-ratio protection screen differential protection after the protection polarity is confirmed to be correct;
s2.9, connecting a portable fault recorder to the second set of high-standby transformer protection screen differential CT loop;
s2.10, starting the 4A circulation pump switch again when the time interval from the last circulation pump starting is more than 10 minutes, checking the polarity of the differential protection CT of the second set of high-standby variable protection screen, and checking parameters such as voltage, current and differential current of the second set of high-standby variable protection screen protection device;
s2.11, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the second set of high-standby power-variable protection screen;
s2.12, after the verification protection is normal, a second set of high-standby-power-transformation protection screen differential protection is put into use, and no abnormality is observed;
s2.13, manually switching the 6kV 4A section from the standby power supply to the working power supply by an operator;
s2.14, pulling the No. 01 high-standby transformer 5001 switch open, and finishing the polarity check work of the high-standby transformer differential protection current.
During the test, the number 01 high reserve and 6kV 4A section must be monitored by a special person.
In summary, the following steps: after the novel installation, transformation or overhaul of the high backup transformer protection, the polarity of the differential protection needs to be checked and verified, after the novel method is used, the polarity check test of the low-voltage side secondary current loop of the high backup transformer protection can be completed by simulating a primary current test, the test result meets the requirement, the purpose of an expected test is achieved, the test time is reduced from 24 hours to 6 hours, the test steps are reduced, the test risk is reduced, the workload of operators and maintainers is reduced, the test efficiency is improved, and the test cost is effectively saved.
The test scheme can also be used for verifying the polarity of differential protection wiring of other equipment such as transformers and reactors in power plants or substations and the like; the same test can be carried out by three, five or more branches, and the method for carrying out polarity verification on the secondary side current loop of the differential protection is the same as that of the scheme as long as a large-current generator is adopted to simulate primary current and replace actual load current.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for detecting the current wiring polarity of a high-standby-power-transformer protection device is characterized by comprising the following steps:
s1, preparing two test short-circuit trolleys, connecting one test short-circuit trolley into a large-current generator, introducing analog load current, and taking secondary current of the branched current transformer as a reference side;
s2, pushing another test short-circuit trolley into the spare incoming switch, checking the polarity relationship and loop integrity of secondary current of each side CT of high-voltage and spare-voltage differential protection low-voltage by using simulated primary current, comparing the polarity relationship of the secondary current of each side CT with the secondary current of a reference side CT, adding simulated current according to the current direction, assuming that the secondary current of the reference branch side is 0 degrees, comparing the secondary current with the reference side, measuring the secondary current of other branch sides to be 180 degrees by using a pincerlike phase table, if the measurement result is consistent with the prediction, indicating that the wiring of the secondary current loop of each branch is correct, and if the measured secondary current angle of a certain branch side is inconsistent with the prediction, indicating that the wiring of the secondary current loop of the branch has a problem and needs to be checked and corrected;
and S3, after the high-standby transformer is powered on, switching the reference branch to high-standby transformer operation, starting the high-power motor, checking the secondary current polarity relationship between the high-voltage side of the high-standby transformer protection and the reference branch by using the motor starting current, and judging the wiring correctness and integrity of the protected current secondary circuit as long as the secondary current polarity relationship between the reference branch side and the high-voltage side is correct.
2. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: and in the S1, the ABC three-phase short circuit board of one test trolley is disassembled and is respectively connected to the three-phase test leads of the large-current generator.
3. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: and (5) monitoring and patrolling corresponding primary and secondary equipment in the checking process, and immediately stopping the test when an abnormality is found.
4. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: the flow-through time is controlled within 15 minutes every time, and the interval time is 10 minutes.
5. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: and after each time of checking is finished, reducing the current of the large-current generator to 0, and disconnecting the test power supply.
6. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: the step of S1 further includes:
s1.1, pushing one of the test trolleys into a 4A section of standby incoming line switch interval by an operator, and shaking to a working position;
s1.2, pushing the other test trolley into the 4B section standby incoming line switch interval by an operator, shaking to a working position, and closing a switch cabinet door;
s1.3, after the tester checks that the test is correct, starting a large current generator, introducing current to one test trolley of the 4A standby incoming lines, and slowly increasing the test current to 30A; closely monitoring whether the No. 01 high standby transformer body and the closed bus are abnormal or not, monitoring whether the interval of the 4A/4B standby incoming lines is abnormal or not, monitoring the heating condition of the test lead, and immediately stopping through-flow when the abnormality is found;
s1.4, checking the current amplitude, the phase and the differential current of the secondary side of the CT of the high backup protection 4A \4B branch channel, and making data records; after the checking is finished, reducing the current of the large-current generator to 0, and disconnecting the test power supply;
s1.5, pulling the two test trolleys out of the standby incoming line switch at intervals, and checking whether the test trolleys are abnormal or not;
s1.6, pushing one test trolley into the spare incoming line switch interval of the 4A section again;
s1.7, sequentially transporting the other test trolley to a No. 1-3 machine 6kV power distribution room; according to the steps, the polarity of the protection secondary current of the 1A \1B \2A \2B \3A \3B branch is checked in sequence, and data recording is made;
s1.8, pushing a second-stage shutdown power supply inlet wire switch into a working position and closing;
s1.9, pushing the other test trolley into a 5A1 standby incoming line switch interval in a 6kV power distribution room of a No. 5 machine, starting a large current generator after a tester checks that the test trolley is correct, introducing current into the 4A standby incoming line test trolley, and slowly increasing the test current to 80A;
s1.10, checking the current amplitude, the phase and the differential current of the secondary side of the CT of a 4A \ secondary branch channel with high backup protection; checking the current amplitude, phase and differential flow of the secondary side of the CT of the secondary shutdown power supply protection power supply side \5A1 branch channel; making data records; after checking, pulling out the other test trolley by 5A1 spare incoming line switch interval;
s1.11, opening a second-stage shutdown power supply incoming line switch;
s1.12, analyzing and checking the correctness of the secondary side current polarity of each branch CT of each 6kV section of the high-backup low-voltage side according to the test data, adjusting the wiring polarity of the current secondary circuit if the polarity is found to be incorrect, and rechecking according to the steps.
7. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 6, wherein the method comprises the following steps: in S1.3, if the secondary current precision is not enough, the test current is increased to 30A, and the secondary current precision is increased to 50A; in S1.9, if the secondary current precision is not enough, the test current is increased to 80A, and the test current can be increased to 100A.
8. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 1, wherein the method comprises the following steps: the step of S2 further includes:
s2.1, exiting high-standby transformer differential protection, and taking No. 01 high-standby transformer 5001 switch overcurrent protection as transformer main protection;
s2.2, connecting a portable fault recorder to the first set of high backup transformer protection screen differential CT loop;
s2.3, before switching the high-voltage station power supply, checking the working state of the quick switching device, and measuring the secondary voltage value and the phase angle value of the incoming line of the 6kV working power supply and the incoming line of the standby power supply, wherein the secondary voltage value and the phase angle value both meet the requirement of synchronous switching;
s2.4, normal switching: an operator manually switches the 6kV 4A section working bus from a working power supply to a standby power supply on a console, and the checking equipment is free of abnormality;
s2.5, starting a 4A tracking pump by an operator, recording protection current waves during starting, and checking the polarity of the differential protection CT of the first set of high-standby transformer protection screen;
s2.6, checking parameters such as voltage, current and power of measurement loops such as a high-backup-transformer gateway electric energy meter and a transmitter, and making data records;
s2.7, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the first set of high backup power transformation protection screen;
s2.8, inputting a first set of high-standby-ratio protection screen differential protection after the protection polarity is confirmed to be correct;
s2.9, connecting a portable fault recorder to the second set of high-standby transformer protection screen differential CT loop;
s2.10, starting the 4A circulation pump switch again when the time interval from the last circulation pump starting is more than 10 minutes, and checking the polarity of the differential protection CT of the second set of high-standby variable protection screen;
s2.11, pulling the 4A circulation pump switch open, and analyzing the correctness of the differential protection polarity of the second set of high-standby power-variable protection screen;
s2.12, after the verification protection is normal, a second set of high-standby-power-transformation protection screen differential protection is put into use, and no abnormality is observed;
s2.13, manually switching the 6kV 4A section from the standby power supply to the working power supply by an operator;
s2.14, pulling the No. 01 high-standby transformer 5001 switch open, and finishing the polarity check work of the high-standby transformer differential protection current.
9. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 8, wherein the method comprises the following steps: in S2.5 and S2.10, parameters such as voltage, current, differential current and the like are checked for the first set of high-standby-power-conversion protection screen protection device and the second set of high-standby-power-conversion protection screen protection device.
10. The method for detecting the current wiring polarity of the high-standby-ratio protection device according to claim 8, wherein the method comprises the following steps: during the test, the number 01 high reserve and 6kV 4A section must be monitored by a special person.
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