注入20hz信号定子接地故障保护的分析与改进

ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501) Pub Date : 2001-08-18 DOI:10.1109/ICEMS.2001.970672

Bi Daqiang, W. Xiang-heng, Xu Zhenyu, Wang Weijian

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引用次数: 1

摘要

通过分析注入20hz信号保护定子接地故障的灵敏度及其影响因素，提出了一种基于阻抗角及其突变分量的发电机保护改进方案。仿真结果验证了该保护方案在通过带二次电阻和灭弧线圈的配电变压器对发电机中性点接地的情况下，与传统判据相比具有更高的可靠性和灵敏度。针对不同的接地方式，通过对注入信号频率的相应调整，进一步提高了保护方案的灵敏度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Analysis and improvement on stator earth-fault protection by injecting 20 Hz signal

By analyzing the sensitivity and its influencing factors of stator earth-fault protection by injecting a 20 Hz signal, this paper puts forward an improved generator protection scheme based on the impedance angle and its mutation component. The simulation results verify this kind of protection scheme has higher reliability and sensitivity under generator neutral grounding through a distribution transformer with a secondary resistor and arc-extinguishing coil compared with the conventional criterion. Against different grounding modes, the sensitivity of the protection scheme is further improved by correspondingly adjusting the frequency of the injected signal.

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ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)

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