Transformer ascending flanged base CT transformation ratio polarity test platform

Abstract

The present invention relates to a transformer ascending flanged base CT transformation ratio polarity test platform. The platform comprises: a voltage input end and a voltage output end connected with the transformer, a capacitor which has one end being connected with the voltage input end and the other end being connected with the voltage output end, wherein the voltage input end and the voltage output end are respectively connected with two ends of the CT in the transformer. The transformer ascending flanged base CT transformation ratio polarity test platform can break through the condition that the ascending flanged base CT transformation ratio and the polarity test only can perform test prior to the installation of a main transformer or after the disassembly of the main transformer.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of electric equipment, in particular to a transformer booster CT ratio polarity test platform. [0003] 【Background technique】 [0004] Transformer riser CT (hereinafter referred to as CT) is a kind of through-type current transformer installed in the riser of the main transformer. It is generally used for differential protection of the main transformer, current measurement and metering. Its transformation ratio and polarity test are important items stipulated in electric power inspection, and also an important diagnostic item stipulated in state maintenance regulations. Ensuring that the transformation ratio and polarity are correct is a necessary condition to ensure the safe and stable operation of the transformer. When performing transformation ratio and polarity tests, it is necessary to apply a current on the primary side of the CT, and then measure the induced current on the secondary side for calculati...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the power capacity of the high-impedance test equipment presented by the transformer coil winding to the power frequency current, the current polarity and transformation ratio test of the CT cannot be carried out after the transformer is installed. after removal

Therefore, after the CT is installed on the transformer body, relevant tests are not carried out with the transformer, so that the CT secondary current circuit cannot be thoroughly inspected, and there are hidden dangers

Especially for the CT at the neutral point, even after the main transformer is put into operation, there is no current in the secondary circuit under normal conditions, and it is impossible to carry out the load test, which has great hidden dangers

In the power system, there have been many vicious accidents in the power grid caused by problems in the secondary circuit of the transformer booster CT.

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