电流互感器回路直流分量对差动保护特性影响的实例分析

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摘要当差动保护电流回路中含有直流分量及谐波时,为了提高发电机差动保护动作的正确率,保护装置利用检测直流分量抬高定值。本文介绍了保护装置在电流回路虚接时差动保护的动作情况,结合发电机差动保护动作特性、发电机机端及中性点侧电流波形和差动保护动作过程中详细报文等数据,分析了直流分量对差动保护动作特性的影响。

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	段进宽
	郭磊

关键词 ：发电机, 差动保护, 直流分量, 差动电流, 制动电流

Abstract：In order to improve accuracy of the differential protection’s action for power generator, in case of the current circuit contains direct current component and harmonics, Siemens protection device has a function by testing direct current component and then increase setting value. The action of differential protection of Siemens protection device when the loose connection happened in the current circuit was introduced. The impact of direct current component on differential protection characteristics was discussed, based on the differential protection action performance of generator, the current oscil- lograms of power generator’s two sides and the messages in differential protection action process, etc.

Key words： generator differential protection direct current component differential current restrain current

收稿日期: 2019-04-02 出版日期: 2020-01-18

作者简介: 段进宽（1984-）,男,河南人,本科,工程师,从事电气检修工作。

引用本文:

段进宽, 郭磊. 电流互感器回路直流分量对差动保护特性影响的实例分析[J]. 电气技术, 2020, 21(1): 89-92. Duan Jinkuan, Guo Lei. Discussion for impact of direct current component on differential protection characteristics. Electrical Engineering, 2020, 21(1): 89-92.

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http://dqjs.cesmedia.cn/CN/Y2020/V21/I1/89