定时限过电流保护整定计算存在的问题及对策  

Problems in Calculation of Setting Values of Timing Over-current Protective Device and Countermeasures

作　　者：王大居 

机构地区：[1]三明钢铁集团公司动力能源公司,福建三明365000

出　　处：《冶金动力》2005年第4期4-6,共3页Metallurgical Power

摘　　要：阐述了三钢集团公司内部电力系统各级定时限过电流保护定值的计算,以炼钢4#转炉用电为例分析保护无法实现选择性的原因,并提出了解决问题的办法。The calculation of setting valuers of timing over-current protective devices at different levels of the power system of Sanming Iron ＆ Steel is expounded. Taking for example power consumption of No.4 converter for steelmaking, the failure causes of selective protection are analyzed and the solving methods are given.

关 键 词：定时限过电流保护 时间级差 选择性 短路电流 

分 类 号：TM588[电气工程—电器]