CN111308296A - Method for evaluating state of valve plate of lightning arrester - Google Patents
Method for evaluating state of valve plate of lightning arrester Download PDFInfo
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- CN111308296A CN111308296A CN202010299146.6A CN202010299146A CN111308296A CN 111308296 A CN111308296 A CN 111308296A CN 202010299146 A CN202010299146 A CN 202010299146A CN 111308296 A CN111308296 A CN 111308296A
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- G—PHYSICS
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1236—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of surge arresters
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Abstract
The invention discloses a method for evaluating the state of a valve plate of a lightning arrester, which solves the problem of how to avoid power failure accidents during resistive current testing. The method abandons the traditional method that a resistive current tester is connected in parallel on a certain phase voltage transformer of the zinc oxide three-phase high-voltage arrester to collect a phase voltage vector, only by measuring and collecting the total leakage current of each phase of the zinc oxide three-phase high-voltage arrester, the total leakage current of the B phase of a middle phase (generally the B phase) of the zinc oxide three-phase high-voltage arrester obtained by measurement is taken as a reference vector, the phase of the reference vector is shifted by minus 90 degrees to obtain an operating voltage direction vector regarded as the B phase, then the phase of the operating voltage direction vector regarded as the B phase is shifted by plus 120 degrees to obtain an operating voltage direction vector regarded as the A phase, the total leakage current of the A phase is subjected to resistive current decomposition on the operating voltage direction vector regarded as the A phase to obtain the resistive current of the A phase on the operating voltage direction vector regarded as the A phase, and the insulation degradation condition of the A-.
Description
Technical Field
The invention relates to a zinc oxide three-phase high-voltage arrester, in particular to a method for evaluating whether insulation of valve plates of each phase of the zinc oxide three-phase high-voltage arrester is degraded or not.
Background
Evaluating the deterioration degree state of a valve plate of a zinc oxide three-phase high-voltage arrester, wherein the prior art is used for testing through a resistive current tester and evaluating the deterioration degree of the valve plate according to the resistive current of each phase of the three-phase high-voltage arrester obtained through testing; each phase circuit of the existing zinc oxide three-phase high-voltage arrester is connected with a voltage transformer in parallel, a secondary coil wiring terminal of the voltage transformer is provided with a wiring terminal for testing, a site tester connects related wiring terminals of a resistive current tester to a secondary coil wiring terminal of a phase voltage transformer corresponding to the zinc oxide three-phase high-voltage arrester and a phase total leakage current detection terminal respectively, under the operation state of the zinc oxide three-phase high-voltage arrester, the phase total leakage current vector and the phase voltage vector are obtained through measurement, the phase total leakage current vector is decomposed to the phase voltage vector by taking the phase voltage vector as a reference, the phase resistive current is obtained, and whether the phase valve plate is degraded or not is judged according to the obtained phase resistive current; in the test process, because the zinc oxide three-phase high-voltage arrester is in a running state, when a voltage measuring wiring terminal of the resistive current tester is connected to a secondary coil of a voltage transformer connected with the zinc oxide three-phase high-voltage arrester in parallel, if the voltage transformer is short-circuited due to improper operation or a fault of an instrument test circuit, the whole power supply circuit can be tripped, and a major power failure accident can be caused; therefore, the method for measuring and acquiring the voltage vector of the zinc oxide three-phase high-voltage arrester parallel voltage transformer on site by using the resistive current tester has a large fault risk, and how to avoid the power failure accident in the resistive current test becomes an urgent problem to be solved on site.
Disclosure of Invention
The invention provides a method for evaluating the state of a valve plate of a lightning arrester, which solves the technical problem of how to avoid power failure accidents during resistive current testing.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the method is characterized in that a traditional method that a resistive current tester is connected in parallel to a certain phase voltage transformer of the zinc oxide three-phase high-voltage arrester to acquire a phase voltage vector is abandoned, only each phase of total leakage current of the zinc oxide three-phase high-voltage arrester, namely A phase of total leakage current, B phase of total leakage current and C phase of total leakage current, is measured, the measured B phase of total leakage current of a middle phase (generally, B phase) of the zinc oxide three-phase high-voltage arrester is used as a reference vector, the phase of the reference vector is shifted by minus 90 degrees to obtain an operating voltage direction vector regarded as B phase, the phase of the operating voltage direction vector regarded as B phase is shifted by plus 120 degrees to obtain an operating voltage direction vector regarded as A phase, and the phase of the operating voltage direction vector regarded as B phase is shifted by minus 120 degrees to obtain an operating voltage direction vector regarded as C phase; performing resistive current decomposition on the A-phase total leakage current in the operating voltage direction vector regarded as the A-phase to obtain A-phase resistive current in the operating voltage direction vector regarded as the A-phase; performing resistive current decomposition on the C-phase total leakage current in the direction vector of the operating voltage which is regarded as the C phase to obtain C-phase resistive current in the direction vector of the operating voltage which is regarded as the C phase; and similarly, comparing the obtained A-phase resistive current in the operating voltage direction vector which is regarded as the A phase with the A-phase initial resistive current of the zinc oxide three-phase high-voltage arrester obtained by the method to judge the deterioration condition of the valve plate of the A-phase arrester, and comparing the obtained C-phase resistive current in the operating voltage direction vector which is regarded as the C phase with the C-phase initial resistive current of the zinc oxide three-phase high-voltage arrester obtained by the method to judge the deterioration condition of the valve plate of the C-phase arrester.
A method for evaluating the state of a valve plate of an arrester comprises a zinc oxide three-phase high-voltage arrester, wherein the intermediate phase of the zinc oxide three-phase high-voltage arrester is a phase B, and the initial resistive current of the phase A and the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester are obtained, and the method is characterized by comprising the following steps of:
firstly, respectively collecting each phase of total leakage fundamental current of a zinc oxide three-phase high-voltage arrester in operation, namely A phase of total leakage fundamental current, B phase of total leakage fundamental current and C phase of total leakage fundamental current, and making a vector diagram of the A phase of total leakage fundamental current, a vector diagram of the B phase of total leakage fundamental current and a vector diagram of the C phase of total leakage fundamental current under the same coordinate;
secondly, phase-shifting the vector of the B-phase full leakage fundamental current by minus 90 degrees to obtain an operating voltage direction vector regarded as the B-phase, then phase-shifting the operating voltage direction vector regarded as the B-phase by plus 120 degrees to obtain an operating voltage direction vector regarded as the A-phase, and simultaneously phase-shifting the operating voltage direction vector regarded as the B-phase by minus 120 degrees to obtain an operating voltage direction vector regarded as the C-phase;
thirdly, performing resistive current decomposition on the A-phase total leakage current in the operating voltage direction vector regarded as the A-phase to obtain A-phase resistive current in the operating voltage direction vector regarded as the A-phase; performing resistive current decomposition on the C-phase total leakage current in the direction vector of the operating voltage which is regarded as the C phase to obtain C-phase resistive current in the direction vector of the operating voltage which is regarded as the C phase;
fourthly, if the ratio of the A-phase resistive current in the direction vector of the operating voltage of the A-phase to the A-phase initial resistive current of the zinc oxide three-phase high-voltage arrester is larger than or equal to 1.5, degrading a valve plate of the A-phase arrester; if the ratio of the C-phase resistive current in the direction vector of the C-phase running voltage to the C-phase initial resistive current of the zinc oxide three-phase high-voltage arrester is larger than or equal to 1.5, the valve plate of the C-phase arrester is degraded; if the ratio of the resistance current of the phase A in the direction vector of the operating voltage of the phase A to the initial resistance current of the phase A of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, and meanwhile, if the ratio of the resistance current of the phase C in the direction vector of the operating voltage of the phase C to the initial resistance current of the phase C of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, the valve plate of the phase B of the zinc oxide three-phase high-voltage arrester is degraded.
The evaluation method can obtain the three-phase total leakage fundamental current of the zinc oxide three-phase high-voltage arrester by only using three current measuring elements, phase-shifting the middle-phase total leakage fundamental current of the zinc oxide three-phase high-voltage arrester by 90 degrees to obtain a reference vector, replacing the middle-phase operating voltage of the zinc oxide three-phase high-voltage arrester with the reference vector, phase-shifting the middle-phase operating voltage by plus and minus 120 degrees respectively to obtain a simulation replacement vector of the A-phase operating voltage and a simulation replacement vector of the C-phase operating voltage, decomposing the A-phase total leakage fundamental current into the simulation replacement vector of the A-phase operating voltage, decomposing the C-phase total leakage fundamental current into the simulation replacement vector of the C-phase operating voltage, comparing the decomposed simulation A-phase resistance current with the initial value of the A-phase resistance current to obtain the deterioration evaluation of the A-phase arrester valve plate, and comparing the decomposed simulation C-phase resistance current with the initial value of the C-phase resistance current to obtain the C-phase avoidance current Evaluating the deterioration of the valve plate of the lightning arrester, and simulating the change of the A-phase resistance current and the C-phase resistance current to obtain the deterioration evaluation of the B-phase lightning arrester valve plate; the invention abandons the traditional test and evaluation method that the voltage transformers need to be connected in parallel when the running voltage is collected, and avoids the risk of short circuit caused by the parallel connection of the voltage transformers.
Drawings
Fig. 1 is a vector representation diagram of the present invention in which the a-phase full-leakage fundamental current obtained by the test is decomposed on a simulated substitute vector of the a-phase operating voltage to obtain an a-phase resistance current in an operating voltage direction vector regarded as the a-phase, and the B-phase full-leakage fundamental current is decomposed on a simulated substitute vector of the B-phase operating voltage to obtain a B-phase resistance current in an operating voltage direction vector regarded as the B-phase.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a method for evaluating the state of a valve plate of an arrester comprises a zinc oxide three-phase high-voltage arrester, wherein the intermediate phase of the zinc oxide three-phase high-voltage arrester is a phase B, and the initial resistive current of the phase A and the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester are obtained, and the method is characterized by comprising the following steps of:
firstly, respectively collecting each phase full leakage fundamental current of a zinc oxide three-phase high-voltage arrester in operation, namely A phase full leakage fundamental current (I)a) B-phase full leakage fundamental current (I)b) And C-phase full leakage fundamental current (I)c) Under the same coordinate, making A-phase full leakage fundamental current (I)a) Vector diagram of (1) and B-phase full leakage fundamental current (I)b) Vector diagram of (1) and C-phase full leakage fundamental current (I)c) The vector diagram of (1);
second, the B-phase full leakage fundamental current (I)b) After the phase of the vector is shifted by minus 90 degrees, the running voltage direction vector (I) which is regarded as the phase B is obtainedbu) Then, the direction vector (I) of the operating voltage of the phase B is regarded asbu) The phase shift is positive 120 degrees, and the running voltage direction vector (I) regarded as the A phase is obtainedau) Simultaneously, the running voltage direction vector which is regarded as the phase B is shifted by minus 120 degrees to obtain the running voltage direction vector (I) which is regarded as the phase Ccu）；
Thirdly, performing resistive current decomposition on the A-phase total leakage current in the direction vector of the operating voltage regarded as the A-phase to obtain an A-phase resistive current (I) in the direction vector of the operating voltage regarded as the A-phaseauz) (ii) a And (3) performing resistive current decomposition on the C-phase total leakage current on the operating voltage direction vector which is regarded as the C phase to obtain C-phase resistive current (I) on the operating voltage direction vector which is regarded as the C phasecuz）；
Step four, if the resistance current of the A phase on the direction vector of the operating voltage of the A phase is regarded as the resistance current (I) of the A phaseauz) When the ratio of the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester is greater than or equal to 1.5, a valve plate of the A phase of the arrester is degraded; if the current is regarded as the C-phase resistance current (I) in the direction vector of the running voltage of the C-phasecuz) When the ratio of the initial resistive current of the C phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the C phase of the zinc oxide three-phase high-voltage arrester is greater than or equal to 1.5, the valve plate of the C phase arrester is degraded; if it is considered to be phase AOperating A-phase resistive current (I) in voltage direction vectorauz) When the ratio of the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, and simultaneously, the C phase of the zinc oxide three-phase high-voltage arrester is regarded as the C phase resistive current (I) in the running voltage direction vector of the C phasecuz) And when the ratio of the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, the valve plate of the phase B arrester is degraded.
Claims (1)
1. A method for evaluating the state of a valve plate of an arrester comprises a zinc oxide three-phase high-voltage arrester, wherein the intermediate phase of the zinc oxide three-phase high-voltage arrester is a phase B, and the initial resistive current of the phase A and the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester are obtained, and the method is characterized by comprising the following steps of:
firstly, respectively collecting each phase full leakage fundamental current of a zinc oxide three-phase high-voltage arrester in operation, namely A phase full leakage fundamental current (I)a) B-phase full leakage fundamental current (I)b) And C-phase full leakage fundamental current (I)c) Under the same coordinate, making A-phase full leakage fundamental current (I)a) Vector diagram of (1) and B-phase full leakage fundamental current (I)b) Vector diagram of (1) and C-phase full leakage fundamental current (I)c) The vector diagram of (1);
second, the B-phase full leakage fundamental current (I)b) After the phase of the vector is shifted by minus 90 degrees, the running voltage direction vector (I) which is regarded as the phase B is obtainedbu) Then, the direction vector (I) of the operating voltage of the phase B is regarded asbu) The phase shift is positive 120 degrees, and the running voltage direction vector (I) regarded as the A phase is obtainedau) Simultaneously, the running voltage direction vector which is regarded as the phase B is shifted by minus 120 degrees to obtain the running voltage direction vector (I) which is regarded as the phase Ccu）；
Thirdly, performing resistive current decomposition on the A-phase total leakage current in the direction vector of the operating voltage regarded as the A-phase to obtain an A-phase resistive current (I) in the direction vector of the operating voltage regarded as the A-phaseauz) (ii) a Performing resistive current decomposition on the C-phase total leakage current on the operating voltage direction vector regarded as the C phase to obtain the operating voltage direction vector regarded as the C phaseC phase resistance current (I)cuz）；
Step four, if the resistance current of the A phase on the direction vector of the operating voltage of the A phase is regarded as the resistance current (I) of the A phaseauz) When the ratio of the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester is greater than or equal to 1.5, a valve plate of the A phase of the arrester is degraded; if the current is regarded as the C-phase resistance current (I) in the direction vector of the running voltage of the C-phasecuz) When the ratio of the initial resistive current of the C phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the C phase of the zinc oxide three-phase high-voltage arrester is greater than or equal to 1.5, the valve plate of the C phase arrester is degraded; if the current is regarded as the A-phase resistance current (I) in the direction vector of the running voltage of the A-phaseauz) When the ratio of the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the A phase of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, and simultaneously, the C phase of the zinc oxide three-phase high-voltage arrester is regarded as the C phase resistive current (I) in the running voltage direction vector of the C phasecuz) And when the ratio of the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester to the initial resistive current of the phase C of the zinc oxide three-phase high-voltage arrester is less than or equal to 0.5, the valve plate of the phase B arrester is degraded.
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