摘要
对比了电动机起动与三相短路故障的电气特性,设计了基于功率因数与电流值合成的相敏型三相短路保护电路,进行了数据测试,分析了保护特性,并将其应用于KJZ-4000-10(6)/3.3矿用隔爆兼本质安全型负荷控制中心。运行结果表明,相敏保护电路可有效区别电动机起动电流与三相短路电流,动作稳定灵敏,从未发生误动或拒动现象,实现了对矿井电网的可靠短路保护。
According to the field requirements, the electrical characteristics between motor starting and three phase short-circuit were compared, the phase-sensitive protection circuit based on the synthesis of power factor and current amplitude was designed, the protection data was tested and the protection characteristic was analyzed. The phase-sensitive protection circuit was uesd in K3Z-4000-10 （6）/3.3 flameproof and intrinsically safe load control center. The circuit can effectively distinguish motor starting current and three-phase short-circuit current and is stable, sensitive and reliable. It is proved that the short-circuit protection of power in underground is reliably realized.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第6期1056-1060,共5页
Journal of China Coal Society
基金
"十一五"国家科技支撑计划重点资助项目(2007BAB13B01
2007BAK29B05)
山西省青年自然科学基金项目(2011021015-1)
关键词
相敏保护
负荷控制
短路故障
综采工作面
phase-sensitive protection
load control
short-circuit fault
mechanized working face
