CN111751598A - Resistive current compensation method for lightning arrester - Google Patents

Resistive current compensation method for lightning arrester Download PDF

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Publication number
CN111751598A
CN111751598A CN202010616805.4A CN202010616805A CN111751598A CN 111751598 A CN111751598 A CN 111751598A CN 202010616805 A CN202010616805 A CN 202010616805A CN 111751598 A CN111751598 A CN 111751598A
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lightning arrester
influence
phase
arrester
current
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CN111751598B (en
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宋临春
王兆丰
王腾滨
黄妍妍
廖煜
王佳烨
何建华
周国生
吴智敏
林瀚伟
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State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
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State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • 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
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermistors And Varistors (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention relates to a resistive current compensation method of a lightning arrester, which comprises the following steps: for the condition that only the influence of the B-phase lightning arrester on the leakage current of the A, C-phase lightning arrester is considered, calculating the influence component of the three phases of the lightning arrester on the leakage current on the vector; for the condition that only the influence of the peripheral electriferous bodies on the leakage current of the lightning arrester is considered, calculating the influence component of the peripheral electriferous bodies on the leakage current of the lightning arrester on a vector; the method comprises the steps of calculating the vector sum of leakage currents of the three-phase lightning arrester by comprehensively considering the influence of surrounding charged bodies on the leakage currents of the lightning arrester and the influence of the three phases of the lightning arrester on each other, calculating the influence component of the surrounding charged bodies on the leakage currents of the lightning arrester and the influence component of the three phases of the lightning arrester on the leakage currents each other through vector decomposition, and then performing complete compensation on the leakage currents of the three-phase lightning arrester. The method is beneficial to improving the effectiveness and accuracy of the resistive current compensation of the lightning arrester.

Description

Resistive current compensation method for lightning arrester
Technical Field
The invention relates to a resistive current compensation method of a lightning arrester.
Background
In the current stage of testing leakage current and resistive current of the lightning arrester in the transformer substation, the resistive current is obviously affected by other phase lightning arresters and surrounding charged bodies, and the unfavorable working condition of the lightning arrester in the operation is not easy to find. The current compensation algorithm of the resistive current of the lightning arrester only considers the influence of the B-phase lightning arrester on the resistive current of the A, C-phase lightning arrester, and the compensation is simply carried out through an angle. The supplement method is not comprehensive enough in consideration, is not accurate in angle compensation, and is easy to cover the bad working conditions or defects of the lightning arrester in the operation process.
Disclosure of Invention
The invention aims to provide a resistive current compensation method of a lightning arrester, which is beneficial to improving the effectiveness and accuracy of resistive current compensation of the lightning arrester.
In order to achieve the purpose, the invention adopts the technical scheme that: a lightning arrester resistive current compensation method comprises the following steps:
for the condition that only the influence of the B-phase lightning arrester on the leakage current of the A, C-phase lightning arrester is considered, calculating the influence component of the three phases of the lightning arrester on the leakage current on the vector;
for the condition that only the influence of the peripheral electriferous bodies on the leakage current of the lightning arrester is considered, calculating the influence component of the peripheral electriferous bodies on the leakage current of the lightning arrester on a vector;
the method comprises the steps of calculating the vector sum of leakage currents of the three-phase lightning arrester by comprehensively considering the influence of surrounding charged bodies on the leakage currents of the lightning arrester and the influence of the three phases of the lightning arrester on each other, calculating the influence component of the surrounding charged bodies on the leakage currents of the lightning arrester and the influence component of the three phases of the lightning arrester on the leakage currents each other through vector decomposition, and then performing complete compensation on the leakage currents of the three-phase lightning arrester.
Further, for the case of considering only the influence of the B-phase arrestor on the leakage current of the A, C-phase arrestor, neglecting the influence of the surrounding charged body on the leakage current of the arrestor, the influence of the B-phase arrestor on the leakage current of the A, C-phase arrestor is obtained by superimposing a capacitive current I under the operating voltage of the B-phase arrestor on the leakage current vector of the A, C-phase arrestoroThe influence of A, C-phase lightning arrester on the resistive current of B-phase lightning arrester is that the sum of capacitive currents under A, C-phase lightning arrester operating voltage is respectively superposed on the leakage current vector of the B-phase lightning arrester and is equal to-Io，Io=Ia+Ib+Ic。
Further, for the case of only considering the influence of the surrounding charged body on the leakage current of the lightning arrester, the influence of the charged body on the leakage current vector of the three-phase lightning arrester is not considered temporarily, the influence of the charged body on the three-phase lightning arrester is the same, and the vector sum of the leakage current of the three-phase lightning arrester is 3 times of the capacitive current under the operating voltage of the charged body, namely Io=(Ia+Ib+Ic)/3。
Further, the method comprehensively considers the influence of the peripheral charged bodies on the leakage current of the lightning arrester and the influence of the leakage current among the three phases of the lightning arrester, calculates the vector sum of the leakage current of the three-phase lightning arrester, performs vector decomposition according to a specified angle, and calculates the influence component of the peripheral charged bodies on the leakage current of the lightning arrester and the influence component of the three phases of the lightning arrester on the leakage current.
Compared with the prior art, the invention has the following beneficial effects: the method not only considers the influence of three phases of the lightning arrester on the leakage current, but also considers the influence of surrounding charged bodies on the leakage current of the lightning arrester, and compensates in a vector calculation mode, so that compared with angle compensation, the method has higher accuracy. After compensation, the method can effectively and accurately reduce the leakage current and the resistive current component of the arrester, thereby assisting in accurately judging the operating condition of the arrester.
Drawings
FIG. 1 is a flow chart of a method implementation of an embodiment of the present invention.
Fig. 2 is a current vector diagram for the case of no surrounding charged body in an embodiment of the present invention.
Fig. 3 is a current vector diagram in the presence of a C-phase conductor around the periphery in an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a method for compensating resistive current of a lightning arrester based on a vector algorithm and a relation between three-phase current and voltage in normal operation, as shown in figure 1, comprising the following steps:
in the case of considering only the influence of the B-phase lightning arrester on the leakage current of the A, C-phase lightning arrester, the influence component of the leakage current between the three phases of the lightning arrester is calculated vectorially.
For the situation, the influence of the surrounding electrifiers on the leakage current of the arrester is ignored, and the influence of the B-phase arrester on the leakage current of the A, C-phase arrester is that capacitive current (lagging B-phase operating voltage) under the operating voltage of the B-phase arrester is respectively superposed on the leakage current vector of the A, C-phase arrester90 degrees), the influence of A, C phase arresters on the resistive current of the B-phase arrester is that A, C phase arrester operating voltage capacitive current is respectively superposed on the leakage current vector of the B-phase arrester (respectively lagging by A, C phase operating voltage by 90 degrees). The two current vector sums are capacitive currents under the operation voltage of the B-phase lightning arrester (lagging the operation voltage of the B-phase by 90 degrees), the amplitude values of the capacitive currents formed under the conditions of nearly the same space distance, same temperature and same humidity are approximately equal, and then the relationship between three-phase currents and voltages is considered, and the vector sum of the leakage currents of the three-phase lightning arrester is the capacitive current I under the operation voltage of the B-phase lightning arrestero(operating voltage 90 degrees after phase B), and applying the current IoSuperimposed on the leakage current of A, B, C-phase lightning arrester to complete compensation, Io=Ia+Ib+Ic。
For the case of considering only the influence of the peripheral electrifier on the arrester leakage current, the influence component of the peripheral electrifier on the arrester leakage current is calculated on the vector.
For the situation, the influence of the interphase of the lightning arrester is not considered for the moment, the influence of the charged body on the leakage current vector of the three-phase lightning arrester is the same, and the vector sum of the leakage current of the three-phase lightning arrester is 3 times of the capacitive current under the operating voltage of the charged body (lags behind the operating voltage of the charged body by 90 degrees), then I iso=(Ia+Ib+Ic)/3。
Fig. 2 is a current vector diagram for the case of no surrounding charged body. Fig. 3 is a current vector diagram in the presence of a C-phase conductor around. As shown in FIG. 2, if there is no charged body around, Ia+Ib+Ic=Io，Iao=Ia-Io，Ibo=Ib+Io，Ico=Ic-Io. If a C-phase charged body is present, I isa+Ib+Ic=IoTo 1, pairoDecomposing the phase voltage into I according to two directions of leading the phase voltage of B90 degrees and leading the phase voltage of C90 degreesobAnd Ioc，Iao=Ia-Iob-Ioc/3，Ibo=Ib+Iob-Ioc/3，Ico=Ic-Iob-Ioc/3（Ia、Ib、IcTo compensate for leakage currents of the front three-phase arrester, Io、Iob、IocRespectively a compensation current, an interphase compensation current and a C-phase charged body compensation current，Ioa、Iob、IocTo compensate for leakage current of the front three-phase arrester).
The method comprises the steps of calculating the vector sum of leakage currents of the three-phase lightning arrester by comprehensively considering the influence of surrounding charged bodies on the leakage currents of the lightning arrester and the influence of the three phases of the lightning arrester on each other, calculating the influence component of the surrounding charged bodies on the leakage currents of the lightning arrester and the influence component of the three phases of the lightning arrester on the leakage currents each other through vector decomposition, and then performing complete compensation on the leakage currents of the three-phase lightning arrester.
The invention not only considers the influence of the B-phase arrester on the resistive current of the A, C-phase arrester, but also considers the influence of the A, C-phase arrester on the resistive current of the B-phase arrester, and can also consider the influence of other surrounding charged bodies according to the actual situation on site. In addition, compensation by a vector algorithm has higher preparation compared with angle compensation.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (4)

1. A method for compensating resistive current of a lightning arrester is characterized by comprising the following steps:
for the condition that only the influence of the B-phase lightning arrester on the leakage current of the A, C-phase lightning arrester is considered, calculating the influence component of the three phases of the lightning arrester on the leakage current on the vector;
for the condition that only the influence of the peripheral electriferous bodies on the leakage current of the lightning arrester is considered, calculating the influence component of the peripheral electriferous bodies on the leakage current of the lightning arrester on a vector;
the method comprises the steps of calculating the vector sum of leakage currents of the three-phase lightning arrester by comprehensively considering the influence of surrounding charged bodies on the leakage currents of the lightning arrester and the influence of the three phases of the lightning arrester on each other, calculating the influence component of the surrounding charged bodies on the leakage currents of the lightning arrester and the influence component of the three phases of the lightning arrester on the leakage currents each other through vector decomposition, and then performing complete compensation on the leakage currents of the three-phase lightning arrester.
2. The method of claim 1, wherein the influence of the surrounding charged body on the leakage current of the arrester is ignored for the case of considering only the influence of the B-phase arrester on the leakage current of A, C-phase arrester, and the influence of the B-phase arrester on the leakage current of A, C-phase arrester is obtained by superimposing a capacitive current I under the operation voltage of the B-phase arrester on the leakage current vector of A, C-phase arresteroThe influence of A, C-phase lightning arrester on the resistive current of B-phase lightning arrester is that the sum of capacitive currents under A, C-phase lightning arrester operating voltage is respectively superposed on the leakage current vector of the B-phase lightning arrester and is equal to-Io，Io=Ia+Ib+Ic。
3. The method of claim 1, wherein the influence of the surrounding charged body on the leakage current of the lightning arrester is not considered, the influence of the charged body on the leakage current vector of the three-phase lightning arrester is not considered, and the sum of the leakage current vectors of the three-phase lightning arrester is 3 times of the capacitive current under the operating voltage of the charged body, i.e. the sum of the leakage currents of the three-phase lightning arrester is Io=(Ia+Ib+Ic)/3。
4. The method of claim 1, wherein the method comprises the steps of calculating the vector sum of the leakage currents of the three phases of the arrester by comprehensively considering the influence of the surrounding charged body on the leakage currents of the arrester and the influence of the leakage currents of the three phases of the arrester, performing vector decomposition according to a specified angle, and calculating the influence component of the surrounding charged body on the leakage currents of the arrester and the influence component of the three phases of the arrester on the leakage currents.
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Citations (6)

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Publication number Priority date Publication date Assignee Title
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CN102565558A (en) * 2010-12-07 2012-07-11 吉林省电力有限公司四平供电公司 Zinc oxide lightning arrester live-line test method
CN204945268U (en) * 2015-08-21 2016-01-06 常州埃依琦科技有限公司 Lightning arrester on-line monitoring circuit
CN108333455A (en) * 2018-04-08 2018-07-27 广东电网有限责任公司 A kind of measuring device with electricity for three-phase alternating current metal oxide arrester group
CN108919026A (en) * 2018-05-28 2018-11-30 国网浙江乐清市供电有限公司 A kind of method of leakage current of an arrester live detection
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CN201489070U (en) * 2009-08-31 2010-05-26 北京华科兴盛电力工程技术有限公司 Arrester detecting device
CN102565558A (en) * 2010-12-07 2012-07-11 吉林省电力有限公司四平供电公司 Zinc oxide lightning arrester live-line test method
CN204945268U (en) * 2015-08-21 2016-01-06 常州埃依琦科技有限公司 Lightning arrester on-line monitoring circuit
CN108333455A (en) * 2018-04-08 2018-07-27 广东电网有限责任公司 A kind of measuring device with electricity for three-phase alternating current metal oxide arrester group
CN108919026A (en) * 2018-05-28 2018-11-30 国网浙江乐清市供电有限公司 A kind of method of leakage current of an arrester live detection
KR102068028B1 (en) * 2019-06-17 2020-01-20 한국수자원공사 Resistive leakage current detector for metal oxide surge arrester and detection method thereof

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