Measuring method of current transformer transformation ratio

A current transformer and current measurement technology, which is applied in the field of measurement, can solve the problems of poor wiring, secondary winding open circuit, reduced work efficiency, complicated wiring, etc., and achieve the effect of reducing the amount of wiring, reducing the amount of wiring, and improving measurement efficiency

Inactive Publication Date: 2011-11-23
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The wiring is complicated, resulting in a decrease in work efficiency;
[0006] (2) Poor wiring may cause the secondary winding to open and generate high voltage, which may injure personnel and equipment.

Method used

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  • Measuring method of current transformer transformation ratio
  • Measuring method of current transformer transformation ratio
  • Measuring method of current transformer transformation ratio

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0018] According to an embodiment of the present invention, a method for measuring the transformation ratio of a current transformer is provided, which includes the following steps: connecting a test instrument to two measuring pile heads of one winding of the current transformer; The non-measuring pile heads with the same measuring pile head are short-circuited respectively; the current transformer is boosted with a test instrument; the current of the short-circuited windings is tested one by one with a clamp ammeter with the same accuracy as the test instrument; the current mutual inductance is obtained from the value of the clamp ammeter Converter ratio.

[0019]...

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Abstract

The invention discloses a measuring method of current transformer transformation ratio. The method comprises the following steps: connecting a test apparatus to two measuring heads of a current transformer winding; short-circuiting other non measuring heads same as the measuring heads in other windings of the current transformer respectively; using the test apparatus to raise current of the current transformer; using a clip on ammeter with same precision of the test apparatus to test current of the above short-circuited windings one by one; obtaining the current transformer transformation ratio through a value of the clip on ammeter. The measuring method of current transformer transformation ratio in the invention has the advantages of reduction of wiring time, improvement of work efficiency, safety in usage and prolongation of service life of test equipment.

Description

technical field [0001] The invention relates to the measurement field, in particular to a method for measuring the transformation ratio of a current transformer. Background technique [0002] The comprehensive characteristic test of current transformer is the main item of new equipment acceptance, among which the transformation ratio inspection test of current transformer is an important test item when the current transformer is handed over and after the winding is replaced. At present, the measurement method of the transformation ratio of the current transformer is generally as follows: use a current booster to increase the current of the primary winding of the current transformer, connect the ammeter in series between the taps of the winding to be tested, short-circuit the other non-test windings to ground, and measure the primary current with a clamp ammeter , Calculate the transformation ratio value through the reading of the ammeter. Every time the tap ratio is measure...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 不公告发明人
Owner STATE GRID CORP OF CHINA
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