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

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基于補償的電容器阻抗保護方法

來源:電工電氣發布時間:2021-03-26 13:26 瀏覽次數:20
基于補償的電容器阻抗保護方法
 
鄧鑫,丁力,王萬純,陳建松,王天偉
(南京南瑞繼保電氣有限公司,江蘇 南京 211102)
 
    摘 要:不平衡保護作為電容器的主保護,存在使用范圍受限、對稱故障無法識別的問題。提出了基于補償的電容器阻抗保護方法,該方法適用范圍廣,特征量可監測且無死區,可作為不平衡保護的后備保護或單獨使用。介紹了以阻抗偏差率為特征量的阻抗保護方法,探討了補償的必要性,分析了靜態補償、動態補償的基本原理,并對補償效果進行了RTDS實驗驗證。實驗結果表明,補償后阻抗保護靈敏性、可靠性均有了顯著提升。
    關鍵詞:電容器;阻抗保護;阻抗偏差率;靜態補償;動態補償
    中圖分類號:TM531.4     文獻標識碼:A     文章編號: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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