Excurse me, The bus is go to Downtown?

这路车是到市中心吗？

Through calculating relay voltage and testing capacitance and safety of DC system, it finds out when the DC voltage excurse to 10%, a point-grounding can lead relay mis-action and breaker-tripping.

通过继电器动作电压的理论计算和变电站现场电容测试、安全性试验，得出当绝缘监测装置引起直流对地电压偏移至10%时，发生直流一点接地可引起保护继电器误动作并导致开关跳闸的结论。