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Operating method of MOA resistive current tester with relatively high precision

A technology of resistive current and working method, applied in the direction of measuring current/voltage, instrument, measuring electricity, etc., can solve the problems of low precision of analysis results, long-range leakage, and difficulty in synchronous sampling of harmonic analysis, etc.

Active Publication Date: 2013-12-11
CHANGZHOU SHUNCHUANG ELECTRICAL TECH
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Problems solved by technology

[0007] In engineering applications, harmonic analysis always carries out limited point sampling and it is difficult to achieve strict synchronous sampling
Thus, when applying quasi-synchronous DFT for harmonic analysis, there will be long-range leakage due to truncation effects and
[0008] Short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

Method used

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  • Operating method of MOA resistive current tester with relatively high precision
  • Operating method of MOA resistive current tester with relatively high precision
  • Operating method of MOA resistive current tester with relatively high precision

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Embodiment Construction

[0046] The working method of the MOA resistive current tester of the present invention comprises the following steps:

[0047] (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 analyzed 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 point...

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Abstract

The invention discloses an operating method of an MOA resistive current tester whose resistive leakage current fundamental wave parameter is usually obtained according to a projection method. Concrete process is that: a power grid voltage and an MOA leakage current signal are sampled simultaneously; a variable fence quasi-synchronous DFT harmonic wave analysis technology is applied to acquire a fundamental wave amplitude value V1=sqrt(ak<2>+bk<2>) and an initial phase angle phi V1=tg<-1>(ak / bk) of the power grid voltage; the variable fence quasi-synchronous DFT harmonic wave analysis technology is applied to acquire the fundamental wave amplitude value and the initial phase angle of the MOA leakage current; a projection angle phi=phi I1-phi V1 of the leakage current fundamental wave on the power grid voltage fundamental wave is acquired according to the projection method; and the MOA resistive leakage current fundamental wave IR1=I1cos(phi) is acquired and outputted to display. According to the operating method of the MOA resistive current tester, analysis errors of the quasi-synchronous DFT harmonic wave analysis technology are effectively improved so that harmonic wave analysis results with high precision are obtained and thus reliability of an MOA resistive current test based on the theory of harmonic wave analysis is enhanced.

Description

[0001] This application is a divisional application, the application number of the original application: 201110322645.3, the title of invention: a working method of MOA resistive current tester, and the application date: 2011-10-21. technical field [0002] 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 [0003] 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 shock 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...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/02
Inventor 傅中君
Owner CHANGZHOU SHUNCHUANG ELECTRICAL TECH
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