The design and implementation of differential protection based on current differential harmonic content

Abstract

Abstract:

Accurately determine current transformer (CT) saturation caused by internal or external fault will increase the reliability of differential protection. After analyzing cause of CT saturation and current differential waveform，a differential protection plan was indicated based on current differential harmonic content. CT is able to accurately transmit secondary current at zero passage. By analyzing the current differential harmonic content，the fault is in or out of the protection range will be determined. The simulation proved that，after applying this protection plan， external fault CT saturation will interlock differential protection effectively. Internal fault CT saturation will release differential protection rapidly.

Key words:

">">differential protection；current transformer (CT)；saturation；current differential harmonic content；current differential wave；simulation study

KANG Feng，WANG Runyi，ZHANG Wei，LIU Qinghai，YANG Qingsong.

The design and implementation of differential protection based on current differential harmonic content

[J]. Huadian Technology, 2017, 39(7): 32-35.

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The design and implementation of differential protection based on current differential harmonic content

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