关键词: 双回线路, 直流供配电, 电网闪络, 均流, 单向电气隔离

Abstract: For AC power supply and distribution systems with dual power / dual circuit lines,as it is not able to run in parallel in a long time,when there is a fault or flashover in a circuit,connect the normal circuit to the blackout circuit by bus switch .Because switching takes a certain amount of time ,it can't keep the continuity of the power supply,so as to cause the user load to jump,it is also possible to expand the scope of power supply failure.According to statistics and analysis,in low voltage power supply and distribution systems,DC power supply and distribution system has its unique advantages,the shortcomings of AC power supply can be overcome by using DC power supply on dual circuits.It can meet the requirement of continuity of power supply for users.A DC power supply and distribution technology for low voltage power supply and distribution system was developed.The actual run test proves that the power supply is safe and reliable with good continuity of power supply,and low running costs,small occupancy space,and there is a certain energy saving effect.

Key words: double circuit line, DC power supply and distribution, power grid flashover, current balance, one-way electrical isolation