主—从式绝缘监测系统的设计

Design of master-slave type insulation monitoring system

直流系统的绝缘水平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,当绝缘电阻在5K到50K之间时,测量精度可达到5%。

A scheme of insulation monitor system of master-slave type is proposed,namely measured insulation resistance of main road with main insulation module,and measure which road insulation resistance decreases with branched insulation module,by lopsided electricity bridge educe an accurate formulation with which the insulation resistance can be calculated when both the plus insulation resistance and the minus insulation resistance defend in DC system,and good effect is obtained in the practical application.When R at 5K to 50K,the precision can reached 5%..