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Working method of MOA (Metal Oxide Arrester) resistive current tester

A resistive current and working method technology, applied in the direction of measuring current/voltage, instruments, measuring electricity, etc., can solve the problems of harmonic analysis difficult to achieve synchronous sampling, low accuracy of analysis results, long-range leakage, etc. Effects of long-range leaks

Active Publication Date: 2014-05-07
路亚科消防车辆制造有限公司
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Problems solved by technology

[0006] In engineering applications, harmonic analysis always carries out limited point sampling and it is difficult to achieve strict synchronous sampling
In this way, when quasi-synchronous DFT is used for harmonic analysis, there will be long-range leakage due to the truncation effect and short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

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  • Working method of MOA (Metal Oxide Arrester) resistive current tester

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Embodiment Construction

[0043] The working method of the MOA resistive current tester of the present invention comprises the following steps:

[0044] (1), the CPU of the MOA resistive current tester samples the grid voltage V and the leakage current I of the MOA at the same time, and samples the grid voltage V and the leakage current I at equal intervals of W+2 sampling points respectively to obtain the analysis signal Discrete sequence {f(k),k=0,1,...,w+1}. W is determined by the integration method, the number of iterations n and the number of sampling points N in the ideal period. Equal interval sampling refers to determining the sampling frequency f according to the frequency f of the ideal signal for harmonic analysis (for example, the frequency of the power frequency signal is 50Hz and the period is 20mS) s =Nf, at sampling frequency f s Under the action of , uniformly sample N points in one cycle. Generally, better harmonic analysis results can be obtained when periodic sampling points N=64...

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Abstract

The invention discloses a working method of MOA (Metal Oxide Arrester) resistive current tester; the resistive leakage current fundamental wave parameters are acquired normally by a projection method, comprising the following steps of: sampling leakage current signals of power grid voltage and MOA at the same time; acquiring the fundamental wave amplitude value V1=(a<2>k+b<2>k)<1 / 2> and an initial phase angle psi v1=tg<-1>(ak / bk) of the power grid voltage by a changeable fence plesiochronous DFT (Discrete Fourier Transformation) harmonic wave analyzing technology; acquiring the fundamental wave amplitude value I1=(a<2>k+b<2>k)<1 / 2> and initial phase angle psi I1=tg<-1>(ak / bk) of the MOA leakage current by the changeable fence plesiochronous DFT harmonic wave analyzing technology; acquiring the projection angle psi=psi I1-psi v1 of the leakage current fundamental wave on the power grid voltage fundamental wave based on the projection method; acquiring the MOA resistive leakage current fundamental wave I=I1*cos(pis) and outputting and displaying the fundamental wave. The analyzing error of the plesiochronous DFT harmonic wave analyzing technology is effectively reduced and high-precision harmonic wave analyzing result is acquired by the working method of MOA resistive current tester provided by the invention. Consequently, the reliability of MOA resistive current test based on harmonic wave analyzing theory is improved.

Description

technical field [0001] The invention relates to the technical field of MOA resistive current testing, in particular to a working method of an MOA resistive current tester based on a high-precision harmonic analysis method. Background technique [0002] Metal oxide surge arresters (hereinafter referred to as MOA) are widely used in power systems due to their superior overvoltage protection characteristics, but the aging of MOA resistors and thermal and impact damage will cause failures, which may lead to explosions and arrester breakdown It will also lead to a short circuit of the substation bus and affect the safe operation of the system. Therefore, strict and effective detection and regular preventive tests must be carried out on the running MOA. In the detection and test of zinc oxide arresters, the measurement of leakage current under AC operating voltage is an important item. The size of the resistive current fundamental wave component in the leakage current can more acc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R31/02
Inventor 傅中君陈鉴富
Owner 路亚科消防车辆制造有限公司
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