Secondary current amplification coil of current transformer

Abstract

The invention discloses a secondary current amplification coil of a current transformer. The secondary current amplification coil of the current transformer is applied to measurement of secondary side CT vectors of the current transformer in the electricity generation process of an electric power system. The secondary current amplification coil of the current transformer comprises a coil body formed by winding a wire in the same direction, the number of turns of the coil body is M, and the two ends of the wire are free ends with the length being N. When secondary side CT vector measurement is conducted under the condition that a power transmission line runs in a non-load mode, the coil body enables currents measured by a pliers-shaped phase meter to be M times of capacitive currents generated to the ground in the non-load condition, the currents measured by the phase meter meet the accuracy requirement, and the current phase angle obtained through measuring remains unchanged. Thus, according to the secondary current amplification coil of the current transformer, secondary side CT vector measurement can be conducted under the condition that the power transmission line runs in the non-load mode, switching operation is not needed, and therefore the measurement efficiency is improved.

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. ...

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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

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