變壓器差動保護歸算思路分析與對策

摘要: 電源容量、電源數量、線路數量、電壓等級的快速增長, 使對影響系統供電可靠性和電能質量的設備要求提高,作為保護變壓器正常運行的保護裝置的靈敏性尤其重要. 分析了影響變壓器差動保護靈敏性的不平衡電流產生的機理, 以及傳統的繼電器保護產品和微機保護裝置對這些影響因素的歸算思路, 提出在以后繼電保護調試和年度預試工作中碰到變壓器保護不正常工作現象的解決對策.

關鍵詞: 變壓器; 差動保護; 歸算; 分析

Abstract :The rapid growth of power capacity , power line number , as well as voltage level , demands greatly for the reliability of power supply and the quality of power system, especially for the sensitivity of protection device which ensures the normal operation of transformers
. The generating mechanismof unbalance current , which may have great influence on the sensitivity of transformer differential protection, is analyzed , and the induction principles of the traditional relay protection products and microprocessor-based protection are also discussed .Some countermeasures are proposed in order to ensure transformer protectioninrelay protectionand debugging and normal annual test .