Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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基于补偿的电容器阻抗保护方法

来源:电工电气发布时间:2021-03-26 13:26 浏览次数:12
基于补偿的电容器阻抗保护方法
 
邓鑫,丁力,王万纯,陈建松,王天伟
(南京南瑞继保电气有限公司,江苏 南京 211102)
 
    摘 要:不平衡保护作为电容器的主保护,存在使用范围受限、对称故障无法识别的问题。提出了基于补偿的电容器阻抗保护方法,该方法适用范围广,特征量可监测且无死区,可作为不平衡保护的后备保护或单独使用。介绍了以阻抗偏差率为特征量的阻抗保护方法,探讨了补偿的必要性,分析了静态补偿、动态补偿的基本原理,并对补偿效果进行了RTDS实验验证。实验结果表明,补偿后阻抗保护灵敏性、可靠性均有了显著提升。
    关键词:电容器;阻抗保护;阻抗偏差率;静态补偿;动态补偿
    中图分类号:TM531.4     文献标识码:A     文章编号:1007-3175(2021)03-0025-05
 
Compensation-Based Impedance Protection for Capacitors
 
DENG Xin, DING Li, WANG Wan-chun, CHEN Jian-song, WANG Tian-wei
(NR Electric Co., Ltd, Nanjing 211102, China)
 
    Abstract: As the main protection of capacitors, unbalance protection has the problems of limited use range and unrecognized symmetrical faults. This paper proposes a capacitor impedance protection method based on compensation. This method has a wide range of applications, feature quantities can be monitored and no dead zone, and can be used as a backup protection for unbalanced protection or used alone. This paper also introduces the impedance protection method with impedance deviation as the characteristic quantity, discusses the necessity of compensation, analyzes the basic principles of static compensation and dynamic compensation, and verifies the compensation effect by RTDS experiment. Experimental results show that after compensation, the sensitivity and reliability of impedance protection have been significantly improved.
    Key words: capacitor; impedance protection; impedance deviation rate; static compensation; dynamic compensation
 
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