In recent years, overvoltage accidents had frequently occurred in 10kv nongrounded system of Yijun substation which seriously influenced the safety of system, even damaged equipments.

• 铜川供电局宜君变10KV不接地系统，近年来频繁发生过电压事故，严重影响了对用户的安全可靠供电，甚至造成设备损坏。