变压器差动保护归算思路分析与对策

变压器差动保护归算思路分析与对策

摘要: 电源容量、电源数量、线路数量、电压等级的快速增长, 使对影响系统供电可靠性和电能质量的设备要求提高,作为保护变压器正常运行的保护装置的灵敏性尤其重要. 分析了影响变压器差动保护灵敏性的不平衡电流产生的机理, 以及传统的继电器保护产品和微机保护装置对这些影响因素的归算思路, 提出在以后继电保护调试和年度预试工作中碰到变压器保护不正常工作现象的解决对策.

关键词: 变压器; 差动保护; 归算; 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 .