Application of Fault Protection of H-voltage Switch Cabinet
The high-voltage cable head at the lower mouth of the high-voltage switchgear will have a flashover accident due to insulation damage,manufacturing process and other problems,and the short-circuit current can not reach the current quick-break protection and overcurrent protection fixed value due to the arc resistance in the flashover process,and the fault range is located above the zero-sequence current transformer,and the protection device has no zero-sequence current sampling,resulting in the fault being cut offwithout protection,so that the fault arc continues to develop rapidly until it produces irreversible serious consequences,so that the fault is cut offby the backup protection of the transformer group.Based on this,this paper studies the application of fault protection upgrade of cable head in high-voltage switchgear,and expects to reduce the occurrence of cable head flashover accident in cable room.
high voltage switchcable headarc protectionself-produced zero sequence overcurrent protection
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