In order to clarify whether the active transfer type arc-extinguishing device (ATT-AED) has difficulty in arc extinguishing under the condition of long feeder line and heavy load,an equivalent circuit after fault phase grounding in the substation under single-phase earth fault is established. The current expression flowing through the fault point is theoretically derived. The current flowing through actual grounding point is numerically simulated after the fault phase grounding in the substation based on ATP-EMTP,and the relationship between the current flowing through the actual grounding point and the single-phase grounding transition resistance is given. The actual single-phase grounding transition resistance range is obtained through actual measurement, foreign experimental results and industry standard requirements. According to above research results, a test circuit is built, and the arc-extinguishing performance of ATT-AED is tested under the most unfavorable arc-extinguishing conditions, possibly encountered in practice. The experimental results show that the ATT-AED can extinguish the arc at the single-phase ground fault point with its length exceeding 1.5mm. Above analysis results show that the ATT-AED does not have arc-extinguishing obstacles under the condition of long feeder line and heavy load.
图3
负荷电流为300 A时实际接地故障点电流与接地过渡电阻的关系曲线仿真结果
Fig. 3
Simulation result of relationship between actual ground fault point current and grounding transition resistance when the load current is 300 A
图4
负荷电流为600 A时实际接地故障点电流与接地过渡电阻的关系曲线的仿真结果
Fig. 4
Simulation result of relationship between actual ground fault point current and grounding transition resistance when the load current is 600 A
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