Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method

A technology of capacitive current compensation and resistive current, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve problems such as hindering research efficiency, increasing research cost, and complicating reference circuits

Inactive Publication Date: 2012-08-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the past, there was no specific reference circuit or the reference circuit was complicated and difficult to understand, which brought a lot of inconvenience to the research, greatly hindered the research efficiency and increased the research cost

Method used

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  • Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method
  • Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method
  • Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing.

[0013] see figure 1 , the circuit of the present invention based on the capacitive current compensation method to measure the MOA resistive current comprises a voltage transformer PT connected to the busbar, a current probe CT embedded in the ground wire of the MOA, an operational amplifier 3, a first voltage compensation device 1 and The second voltage compensation device 2, wherein:

[0014] The first voltage compensation device 1 is connected to the inverting input terminal of the operational amplifier 3 and the current probe CT;

[0015] The second voltage compensation device 2 is connected to the non-inverting input terminal of the operational amplifier 3 and the voltage transformer CT.

[0016] In this embodiment, the first voltage compensating device 1 and the second voltage compensating device 2 are both reactive power compensating devices, and reactive power comp...

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Abstract

The invention discloses a circuit for measuring an MOA (metal oxide arrester) resistive current based on the capacitive current compensational method, and the circuit includes a voltage transformer connected with a bus, a current probe inserted in an MOA ground wire, an operational amplifier, a first voltage compensation device and a second voltage compensation device, wherein the first voltage compensation device is connected with an anti-phase input end of the operational amplifier and the current probe; and the second voltage compensation device is connected with a in-phase input end of the operational amplifier and the voltage transformer, the circuit disclosed by the invention has a simple structure, is easy to realize, compensates the capacitive current in the total current flowing through a zinc oxide arrester, and directly obtains a resistive current.

Description

technical field [0001] The invention relates to a measuring circuit, in particular to a circuit for measuring the resistive current of an MOA (zinc oxide arrester) based on a capacitive current compensation method. Background technique [0002] According to the research on the aging mechanism and equivalent circuit of MOA, there are many methods for MOA resistive current detection. The deterioration of zinc oxide arrester (MOA) is mainly reflected by the increase of resistive current. Therefore, the capacitive current in the total current flowing through the arrester is balanced, and the change of resistive current is directly detected to reflect the deterioration of MOA. The current method is more sensitive. The principle of measuring resistive current with capacitive current compensation method is clear, the method is simple, and it is widely used in practice at present. The basic principle is to use the hardware circuit to compensate the detected full current in the det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/00
Inventor 姚建歆徐剑胡水莲金琪计杰章健解蕾张弛张鹏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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