降压站35kV不接地系统两种接地保护技术的改进及应用  

Improved Application of Two Kinds of Earthing Protection Technology in 35kV Unearthing System of Step-down Station

作　　者：陈国栋 Chen Guodong(Energy Power Plant of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan Shanxi 030003)

机构地区：[1]山西太钢不锈钢股份有限公司能源动力总厂,山西太原030003

出　　处：《山西冶金》2021年第6期193-196,共4页Shanxi Metallurgy

摘　　要：太钢十一降35 kV供电系统线路频繁发生线路单相接地,现场电缆炸损情况极为严重,直接影响太钢新炼钢160 t大功率电炉的生产运行,其直接及间接损失严重。针对此难题,进行了35 kV不接地系统接地保护的创新、优化、改进,阐述了改进方案及实施过程。实施后效果良好,为钢铁行业35 kV大功率电炉的保护技术难题提供了极有价值的借鉴。The single-phase grounding of the line frequently occurs in the 35 kV power supply system of No.11 reduction of TISCO,and the on-site cable explosion damage is very serious,which directly affects the production and operation of 160 t high-power electric furnace for new steelmaking of TISCO,and its direct and indirect losses are serious.Aiming at this problem,the innovation,optimization and improvement of grounding protection of 35 kV ungrounded system are carried out,and the improvement scheme and implementation process are described.The implementation effect is good,and the insulation damage and cable explosion caused by single-phase grounding of ungrounded system of 35 kV large electric furnace in power system are eliminated.It provides valuable reference for the protection of 35 kV high power electric furnace in steel industry.

关 键 词：大型电炉 不接地系统 零序电压 保护跳闸 接地告警 

分 类 号：TM862[电气工程—高电压与绝缘技术]