220 kV主变10 kV侧空载时避雷器的选择  

Surge Arrester Choosing for 10 kV Side of 220 kV Main Transformer with no Load

作　　者：王天施[1] 王清昊[2] 苑舜[3] 张运山[2] 王新伟[3] 

机构地区：[1]辽宁石油化工大学信息与控制工程学院,辽宁抚顺113001 [2]抚顺供电公司,辽宁抚顺113008 [3]沈阳工业大学电气工程学院,沈阳110178

出　　处：《电瓷避雷器》2012年第2期86-89,94,共5页Insulators and Surge Arresters

摘　　要：通过对220 kV变压器10 kV侧空载时运行方式的对比分析,说明了10 kV侧没有母线时,采用b相直接接地运行方式的不足,指出在每相上并联一支避雷器为最佳运行方式;详细论述了电容传递过电压的产生条件及其计算方法,提出以电容传递过电压最大值作为避雷器的额定电压,并以2 h为基准进行工频耐受时间特性校核的无间隙避雷器的选择方法,并通过运行实例说明该运行方式的可行性。Through comparative analysis on operation mode of 10 kV side of 220 kV main transformer with no load,the shortcoming of the B-phase direct grounding operation type is described and it is pointed that a arrester parallel connected with each phase is the best protecting method when there is no bus on the 10 kV side; The generating conditions and calculation method of capacitance transfer overvoltage are discussed in detail, it is proposed to use the maximum capacitance transfer over-voltage as the rated voltage of the arrester, and 2 h power frequency voltage tolerance time characteristics for arrester checking are presented, and the feasibility is proved by a operation example.

关 键 词：220 kV主变 运行方式 避雷器 电容传递过电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]