Method for extracting resistance current of metal oxide arrester (MOA)

A technology of resistive current and extraction method, applied in the direction of measuring current/voltage, instrument, measuring electricity, etc., can solve the problems of i3r analysis, error, etc., and achieve the effect of reducing the number of replacements, saving money, and improving work efficiency

Inactive Publication Date: 2015-03-25
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, this method does not analyze the composition of i3r, using this algorithm to calculate i 3r It will change with the change of harmonic voltage, so there will be a certain error

Method used

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  • Method for extracting resistance current of metal oxide arrester (MOA)
  • Method for extracting resistance current of metal oxide arrester (MOA)
  • Method for extracting resistance current of metal oxide arrester (MOA)

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0017] The method for extracting the resistive current of the metal oxide arrester of the present invention can be divided into the following three steps:

[0018] first step,

[0019] The voltage signal u(t) applied to the MOA to be measured is obtained through a transformer or a capacitor voltage divider, and the obtained voltage signal u(t) is applied to a known capacitance C 2 on (Note: C 2 The value can be any value. It is convenient to measure the capacitive current signal generated by it. Its value is about 10μF, such as C 2 The value is 10μF); use a through-hole current sensor or a series current sensor to obtain the capacitance C through the known 2 The capacitive current i C2 And through the leakage current signal i(t) of the MOA to be measured, according to the orthogonal principle of resistive current and capacitive current, it can ...

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Abstract

The invention provides a method for extracting the resistance current of a metal oxide arrester (MOA). By the adoption of the method, the influence of harmonic voltages on the resistance current can be eliminated more effectively, the error of i1r and i3r is reduced ultimately, hence, the operation condition of the MOA can be reflected more accurately, and safety operation of a power electrical system is guaranteed. The principle that the capacity current and the capacitance are in proportion is used for solving the capacity current, the equivalent resistance R1 is used for eliminating the harmonic influence, hence, the resistance current (ir) can be calculated more accurately, the ir is used for calculating the i1r and the i3r through an FFT algorithm, and finally on-line monitoring of the MOA is achieved.

Description

Technical field: [0001] The invention belongs to the field of electrical equipment testing, and in particular relates to a method for extracting resistive current from a metal oxide arrester. Background technique: [0002] Metal oxide arrester (metal oxide arrester, MOA) has many excellent characteristics, it has gradually replaced the traditional SiC arrester in the market, but at the same time its shortcomings and shortcomings are increasingly exposed, MOA generally works online and is affected by external factors (such as temperature, humidity, etc.) will gradually cause aging and deterioration, and finally completely lose the protective effect and even cause a short circuit accident in the power grid. It is a relatively cumbersome task to conduct power-off inspections of MOA in the power and electrical system every year. Therefore, it is not conducive to timely and effective troubleshooting of hidden dangers, which seriously hinders the development of my country's smart ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/00
Inventor 杨仲江曹洪亮周中山李鹏飞陈则煌
Owner NANJING UNIV OF INFORMATION SCI & TECH
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