终端变电所的短路电流估算及断路器的选用  

Short Circuit Current Calculations and Seletion of Circuit Breaker in Terminal Substation

作　　者：王国贤 

机构地区：[1]无锡市恒禾工程咨询设计有限公司,江苏无锡214031

出　　处：《现代建筑电气》2014年第9期20-24,共5页Modern Architecture Electric

摘　　要：介绍了终端变电所短路电流估算时的假定条件。终端变电所短路电流计算时,忽略10 kV侧线缆、主断路器、低压母线等的阻抗,可根据变压器的容量和阻抗电压百分数,快捷、方便地估算出短路电流。最后,分析了终端变电所断路器的选用原则,以供电气设计人员在设计选型时提供参考。The assumptive conditions of short circuit current estimates in terminal substation were introduced. The short circuit can be considered as the remote short circuit. The 10 kV side cable,the main circuit breaker,the impedance of the low voltage bus bar and so on,were ignored when the short circuit cureent was calculated in terminal substation.According to the capacity of transformer and impedance voltage percent,the short circuit current was estimated quickly and easily. Finally,the selection principle of circuit breaker in terminal substation was analyzed. It could provide references for electrical designers.

关 键 词：短路电流 变压器容量 分断能力 断路器 

分 类 号：TM63[电气工程—电力系统及自动化] TM561