中国电力 ›› 2015, Vol. 48 ›› Issue (8): 141-145.DOI: 10.11930.2015.8.141

• 发电 • 上一篇    下一篇

厂内电气系统故障对厂用电快切方式的影响

李子峰   

  1. 神华国能宝清煤电化有限公司,黑龙江 双鸭山 155600
  • 收稿日期:2015-04-10 出版日期:2015-08-25 发布日期:2015-11-25
  • 作者简介:李子峰(1968—),男,山东莱芜人,高级工程师,从事继电保护实验研究工作。E-mail: zifengli1968@126.com

Impact Analysis of Power System Fault Inside Power Plant on Power Supply Switching Mechanism

LI Zifeng   

  1. Shenhua Guoneng Energy Group Baoqing Coal Electricity Chemical Co., Ltd., Shuangyashan 155600, China
  • Received:2015-04-10 Online:2015-08-25 Published:2015-11-25

摘要: 厂用电快切原理认为切换前工作电源电压与备用电源电压同相位,然而此种假设仅出现在电气系统无故障时,实际上电厂运行工况较为复杂。论证了电气系统故障对快切方式的影响,首先用对称分量法对厂内高压电气系统发生两相接地短路的情况进行故障分析,认为当厂用电系统发生故障并切换电源时,工作电源电压与备用电源电压相位并不相同,进而估算电气系统故障时母线残压特性的实际曲线,说明残压实际曲线与理论曲线的差别,并分析母线残压特性的变化对各种快切方式的影响,指出快切不成功的可能性及其原因,提出快切装置定值整定时应考虑电气系统故障情况的建议。

关键词: 厂用电, 快切方式, 残压, 特性, 相量

Abstract: High speed power supply switching equipment is based on assumption of same phasor angle between operation and backup voltage. However, the assumption is not satisfied when fault happens in the system. The impact of fault scenario on power supply switching mechanism is analyzed. The fault analysis during two-phase grounding fault is conducted which shows different phase angle between operation and backup source voltage. The practical bus bar residual voltage during fault is also analyzed. Because of difference between practical and theoretical value, high speed switching may not be successful. Some advice related to high speed switching device settings are given with consideration of possible electric system fault.

Key words: auxiliary power, transfer mode, residual voltage, characteristic, phasor

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