电器与能效管理技术 ›› 2020, Vol. 591 ›› Issue (6): 46-52.doi: 10.16628/j.cnki.2095-8188.2020.06.010

• 检测与试验 • 上一篇    下一篇

断路器保护的低压电缆热稳定校验

王从科, 张述   

  1. 中国中建设计集团有限公司,北京 100037
  • 收稿日期:2019-12-21 出版日期:2020-06-15 发布日期:2020-07-07
  • 作者简介:王从科(1979—),男,高级工程师,主要从事建筑电气和智能化设计工作。
    张述(1968—),女,教授级高级工程师,主要从事电气及智能化方面的工作。

Low Voltage Cable Thermal Stability Check for Circuit Breaker Protection

WANG Congke, ZHANG Shu   

  1. China Construction Engineering Design Group Co.,Ltd.,Beijing 100037,China
  • Received:2019-12-21 Online:2020-06-15 Published:2020-07-07

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 mm2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。

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

Abstract: 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 mm2 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.

Key words: thermal stability check, thermal effect, three-phase short-circuit current, transient protection, short delay protection

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