Operating method of MOA resistive current online monitoring system

A resistive current and monitoring system technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of short-range leakage, difficulty in synchronizing sampling for harmonic analysis, and unreliability.

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
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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  • Operating method of MOA resistive current online monitoring system
  • Operating method of MOA resistive current online monitoring system
  • Operating method of MOA resistive current online monitoring system

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Embodiment Construction

[0045] An MOA resistive current online monitoring system of the present invention includes: an MOA resistive current online test unit, and a monitoring server for data communication with the MOA resistive current online test unit through a wired or wireless network.

[0046] The working method of the MOA resistive current online monitoring system comprises the following steps:

[0047] (1), the CPU of the MOA resistive current online test unit samples the leakage current I of the grid voltage V and the MOA simultaneously, and samples W+2 sampling points at equal intervals of the grid voltage V and the leakage current I respectively, so as to obtain the obtained The discrete sequence {f(k), k=0, 1, . . . , w+1} of the signal is analyzed. 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 sig...

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Abstract

The invention discloses an operating method of an MOA resistive current online monitoring system whose resistive leakage current fundamental wave parameter is usually obtained according to a projection method. A 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 and an initial phase angle 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 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 is acquired and outputted to display. According to the operating method of the MOA resistive current online monitoring system, 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: 201110322641.5, the title of invention: a working method of an MOA resistive current online monitoring system, 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 online monitoring system 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/06G01R31/00
Inventor 傅中君
Owner CHANGZHOU SHUNCHUANG ELECTRICAL TECH
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