Method and device for testing current ratio staudard high-correctness current transformer

A technology of current transformer and current ratio, applied in measuring devices, instruments, measuring electrical variables, etc., can solve the problems of power frequency interference, time-consuming, complicated operation, etc., to save time and reduce labor intensity.

Inactive Publication Date: 2003-07-16
WUHAN WHVRI ELECTRIC POWER SCI & TECH
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Problems solved by technology

[0002] Existing technologies such as: The transformer book "Current Ratio Standard" edited by Zhao Xiumin, which introduces various current ratio standards such as: double-stage current transformers, current comparators, zero-flux current transformers, and transformer verification The device, its measurement circuit and compensation signal output circuit are all in the form of electrical analog circuits. It needs to go through two visual inspections to manually adjust the balance, once to adjust the zero magnetic flux, and once to measure the error. When the "zero adjustment" and "measurement" refer to zero The readings are correct only if the instrument points to zero. The two processes must be switched in time. This calibration method is complicated and time-consuming. At the same time, the zeroing load used by the calibration device contains capacitive loads, which are easily disturbed by the power frequency. When the external power frequency fluctuates greatly, it will increase the difficulty of zero adjustment

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  • Method and device for testing current ratio staudard high-correctness current transformer

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[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] figure 1 Among them, the current ratio standard 1 is a zero-flux double-stage current transformer, the primary winding polarity end of the tested high-accuracy current transformer 2 is connected with the primary winding polarity end of the current ratio standard 1, and the current booster 3 is The non-polar end of the primary winding of the tested high-accuracy current transformer 2 and the current ratio standard 1 inputs the primary current signal, and the polarity end of the secondary winding of the tested high-accuracy current transformer 2 is connected with the secondary winding of the current ratio standard 1 , compensation winding N B The polarity end of the test is connected, and the reference current signal T of the test is extracted through the secondary load 4 after the secondary non-polar end of the high-accuracy current transformer 2 under...

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Abstract

A method and device for testing the current proportion standard type high-correctness current transformer features that a microprocessor is used to analyze the data about zero test signal of test winding to generate automatic compensation signal of zero magnetic-flux, or a inverter is used to process the difference signal to obtain the compensation signal. Its advantages are no need of manual switching-over and no interference from frequency of power supply.

Description

technical field [0001] The invention relates to a transformer calibration method and device, in particular to a high-accuracy current transformer calibration method and device using a current ratio standard as a reference, belonging to the field of electric energy measurement. Background technique [0002] Existing technologies such as: The transformer book "Current Ratio Standard" edited by Zhao Xiumin, which introduces various current ratio standards such as: double-stage current transformers, current comparators, zero-flux current transformers, and transformer verification The device, its measurement circuit and compensation signal output circuit are all in the form of electrical analog circuits. It needs to go through two visual inspections to manually adjust the balance, once to adjust the zero magnetic flux, and once to measure the error. The readings are correct only if the instrument points to zero. The two processes must be switched in time. This calibration method ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 王勤吕玲王宇顾红波
Owner WUHAN WHVRI ELECTRIC POWER SCI & TECH
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