Title: Protective method and device for distribution net work earthing fault
Application Number: 200610123404 Application Date: 2006.11.03
Publication Number: 1988302 Publication Date: 2007.06.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02H3/16;H02H7/26
Applicant(s) Name: Shantou Automation Electric Group Co., Ltd. Address:
Inventor(s) Name: Zheng Zhenjiang;Huang Jifeng;Zhang Weili
Attorney & Agent: tangrui wen
Abstract:
    This invention relates to a protection method for earth faults of distribution network including the following steps: 1, detecting if there is arc earth fault in three-phases of the network on-line, 2, if there is the fault in one phase, then its circuit is connected to the earth directly for a while, 3, on-line detecting if the fault happens to said phase, if so, said circuit is connected to the earth directly, otherwise returning to step 1, 4, repairing said circuit and returning to step 1. The device includes a single-chip control module, three voltage-inductors and three single-phase earth circuits, and the three voltage-mutual inductors are corresponding to one phase transmission circuit of the network.
Time: 22