断路器保护的低压电缆热稳定校验  

Low Voltage Cable Thermal Stability Check for Circuit Breaker Protection

作　　者：王从科 张述 WANG Congke;ZHANG Shu(China Construction Engineering Design Group Co.,Ltd.,Beijing 100037,China)

机构地区：[1]中国中建设计集团有限公司,北京100037

出　　处：《电器与能效管理技术》2020年第6期46-52,共7页Electrical & Energy Management Technology

摘　　要：通过具体的配电系统,详细计算出不同类型断路器对低压电缆热稳定的影响。根据断路器额定电流正常选择的框架等级,配出回路电缆截面在6 mm 2及以上均满足热稳定要求。提出通过合理选择断路器及电缆,除非在距离变电所配电柜很近或配出回路电缆截面很小的情况下,电缆热稳定一般不需要校验。Through the specific distribution system,the effects of different types of circuit breakers on the thermal stability of low voltage cables are calculated in detail.According to the normal frame level of the circuit breaker rated current,the cable section of the distribution circuit is 6 mm 2 or above,which can meet the requirements of thermal stability.It is proposed that the thermal stability of the cable should not be checked unless it is very close to the distribution cabinet of the substation or the cable section of the distribution circuit is very small.

关 键 词：热稳定校验 热效应 三相短路电流 瞬时保护 短延时保护 

分 类 号：TM561[电气工程—电器]