华电技术 ›› 2015, Vol. 37 ›› Issue (9): 51-52.

• 技术交流 • 上一篇    下一篇

380 V 低压四芯电力电缆相对N线短路电流计算

  

  1. 湖北华电襄阳发电有限公司,湖北襄阳〓441141
  • 出版日期:2015-09-25 发布日期:2015-11-26

Calculation for short circuit current of 380V low voltage fourcore power cable

  1. Hubei Huadian Xiangyang Power Company Limited, Xiangyang 441141, China
  • Online:2015-09-25 Published:2015-11-26

摘要:

摘要:发电厂中380V厂用电系统动力中心(PC)和电动机控制中心(MCC)广泛设计成TN-S接地系统后,相关设计手册中给出的标准短路电流曲线已经不能满足使用需要。给出了380V厂用电系统PCMCC低压电缆相对N线短路电流的计算方法,通过该方法可得出短路电流随电缆长度的变化关系,供继电保护定值整定和灵敏度校验。

关键词: ">关键词:">380">V">厂用电系统;四芯电力电缆;短路电流

Abstract:

Abstract:Due to most 380 V plant power system power center (PC) and motor control center (MCC) are TN-S grounding,the standard short circuit current curve in existing design handbook cannot satisfy the practical demand.This paper provided methods to calculate the short circuit current of 380 V four core power cable from PC to MCC of plant power system.Based on these methods,the relationship between short circuit current and cable length was indicated,which can be applied for relay protection value setting and sensitivity verification.

Key words: ">Keywords:380">V plant power system">;">four">core power cable">;">short circuit current