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A current transformer secondary current amplification coil

A technology of current transformer and secondary current, applied in the direction of inductor, transformer/inductor coil/winding/connection, voltage/current isolation, etc., can solve the problems of low efficiency and cumbersome CT vector measurement process on the secondary side, etc. Achieve the effect of improving measurement efficiency

Active Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present application provides a secondary current amplification coil of a current transformer to solve the problems of cumbersome and inefficient secondary side CT vector measurement process in the prior art

Method used

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  • A current transformer secondary current amplification coil
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  • A current transformer secondary current amplification coil

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Embodiment Construction

[0021] In order to solve the cumbersome problem of measuring the CT vector on the secondary side in the prior art, the applicant has conducted a lot of research. The applicant found that the capacitive current will be generated to the ground due to the no-load operation of the transmission line, and the capacitive current is proportional to the line voltage level and line length, but the generated capacitive current is far lower than the normal load current of the line, so the solution in the prior art needs to perform switching operation, resulting in a cumbersome measurement process. To this end, the present application provides a secondary current amplification coil of a current transformer to solve the problem that the capacitive current generated to the ground is much lower than the normal load current of the line under the condition of no-load operation.

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the applicati...

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Abstract

This application discloses a secondary current amplification coil of a current transformer, which is used in the CT vector measurement of the secondary side of the current transformer in the power system power generation process. The coil body, and the two ends of the wire are free ends with a length of N. When the secondary side CT vector measurement is performed under the condition of no-load operation of the transmission line, the current measured by the clamp phase meter through the coil body is M times the capacitive current generated to the ground under no-load conditions, and the phase The current measured by the meter meets the accuracy requirements, and the phase angle of the measured voltage remains unchanged. It can be seen that the secondary current amplification coil of the current transformer disclosed in this application can also perform CT on the secondary side under the condition of no-load operation of the transmission line. Vector measurement does not require switching operations, thereby improving measurement efficiency.

Description

technical field [0001] The present application relates to the technical field of current detection, and more specifically, to a secondary current amplification coil of a current transformer. Background technique [0002] Before the normal operation of the new line in the power system, it is necessary to measure the secondary side vector of the current transformer (CT) to check the polarity of the secondary current loop of the current transformer and the correctness of the CT transformation ratio. Usually the measurement tool generally uses a clamp phase meter, but at present, most clamp phase meters can only meet their accuracy requirements when the secondary current needs to exceed 10mA, so it is generally necessary to perform switching operations in substations or power plants to bring a certain amount of current on the line. The CT vector can only be measured after the load is applied, which shows that the process is cumbersome, resulting in low measurement efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/28H01F27/28G01R15/18
Inventor 蔡勇王凤岭孟磊郎博宇万晓光陈方东赵雪松陈国东郭飞寇凌岳
Owner STATE GRID CORP OF CHINA
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