SEL787保护装置在变压器差动保护中的应用  

Application of SEL787 Protector in Transformer Differential Protection

作　　者：徐文凯 罗小兵 禄伟 Xu Wenkai;Luo Xiaobing;Lu Wei(YUNNAN CHIHONG Zn&Ge Co.,Ltd.,Huize 654200,China)

机构地区：[1]云南驰宏锌锗股份有限公司,云南会泽654200

出　　处：《有色金属设计》2020年第4期87-89,共3页Nonferrous Metals Design

摘　　要：根据变压器差动保护的原理,差动保护的原理是根据基尔霍夫电流定律来工作的,当变压器正常工作或者区外故障时,通过补偿计算以后流入和流出变压器电流相等,变压器高低压侧基本没有差流,差动保护不会动作,若变压器发生短路等故障时,变压器流入和流出电流不等,高低压侧形成差流,若差流值达到整定值,则差动保护动作。According to the principle of differential protection(DP),which works based on Kirchhoff’s Current Law,if the transformer is in normal operation or outer fault,the current inflows and outflows of the transformer via compensative calculating are equal,and the high and low pressure side of transformer remain roughly in same current,the DP will not operate.If the transformer has short-circuit or other faults,including the current inflows and outflows of the transformer are unequal,and the high and low pressure side of the transformer is in differential current,once the differential current value reaches setting value,the DP will operate.

关 键 词：SEL787 差动保护原理 YD11接线 补偿 差速断 

分 类 号：TM403.5[电气工程—电器]