Short Description:
In China's 3-35KV power supply system, most of them are neutral ungrounded systems. According to our company's regulations, this system is allowed to operate with faults for 2 hours in the event of single-phase grounding, which greatly reduces operating costs and improves the reliability of the power supply system. However, due to the gradual increase in the power supply capacity of the system, the power supply mode has gradually shifted from overhead lines to cable lines, and the system's ground capacitance current will become very large. When a single-phase grounding occurs in the system, the arc formed by excessive capacitive current is not easy to extinguish and may evolve into intermittent arc grounding. At this time, the generated arc grounding overvoltage and the iron excited by it
In China's 3-35KV power supply system, most of them are neutral ungrounded systems. According to our company's regulations, this system is allowed to operate with faults for 2 hours in the event of single-phase grounding, which greatly reduces operating costs and improves the reliability of the power supply system. However, due to the gradual increase in the power supply capacity of the system, the power supply mode has gradually shifted from overhead lines to cable lines, and the system's ground capacitance current will become very large. When a single-phase grounding occurs in the system, the arc formed by excessive capacitive current is not easy to extinguish and may evolve into intermittent arc grounding. At this time, the generated arc grounding overvoltage and the iron excited by it