摘要
直流系统的绝缘性能直接影响直流回路的可靠性。针对监测电网直流系统的绝缘问题,提出了一种主-从式绝缘监测系统的设计方案,即用一个绝缘主模块来测量主回路的绝缘电阻,而用专门的支路模块来判断出现绝缘降低的那条支路,并利用不平衡电桥法给出了一个较为精确的,用于电网直流系统计算正负母线绝缘值都出现降低的情况下的正、负绝缘电阻的公式,在实际应用中取得了很好的效果,测量精度可达到5%。
The insulation level influences reliability of DC loop in the DC system directly. To solve the problem of insulation in the DC monitoring system, this paper proposed a scheme of insulation monitor system with master-slave type, measuring insulation resistance of main route with main insulation module and branch route with a branch insulation module. Formulation with which the insulation resistance can be calculated was educed. This method obtained good effect in apolication and the orecision can reach to 5%.
出处
《中国测试技术》
2007年第4期126-128,共3页
CHINA MEASUREMENT & TESTING TECHNOLOGY
关键词
直流系统
主-从式
绝缘监测
不平衡电桥
绝缘电阻
DC system
Master-slave type
Insulation monitoring
Lopsided electricity bridge
Insulation resistance
