Beijing Inhand Networks Technology Co., Ltd.

Xianwu Tang

Jianliang Zhang

Jinao Li

Hongwei Zang

A method and system for detecting and locating a single-phase ground fault on a low current grounded power-distribution network, comprising: respectively testing and picking up the voltage signals and current signals at multiple positions on each phase feeder (), and determining the corresponding transient voltage signals and transient current signals according to the extraction of the voltage signals and the current signals (); when the change in the transient voltage signals and the transient current signals exceeds a preset threshold (), synchronously picking up the voltage signals and current signals at multiple positions on a three-phase feeder (); calculating corresponding zero-sequence voltages and zero-sequence currents according to the voltage signals and current signals synchronously picked up at multiple positions on the three-phase feeder (), and then extracting the steady-state signal and transient signal of the zero-sequence voltage and zero-sequence current at each position on the three-phase feeder (); and determining a specific fault location on a faulty line according to the steady-state signal and the transient signal (). The method effectively detects and displays a single-phase ground fault on a low current grounded power-distribution network.

Method for detecting and locating single-phase ground fault on low current grounded power-distribution network

Disclosed is a PCB Rogowski coil, comprising two groups of first coils and second coils which are connected in series and have opposite winding directions, wherein the first coil and the second coil respectively contain a plurality of wire turns. One wire turn of the first coil comprises an inlet wire, a winding wire and an outlet wire. The winding wires of each wire turn of the first coil are arranged in radially parallel with each other. The winding wires are respectively arranged on both the upper surface and the lower surface of a PCB board, with the inlet wire passes through a via hole on the PCB board and is connected to the winding wire. The interference of an external magnetic field is therefore markedly eliminated, and the anti-external interference capability of a Rogowski coil is improved.

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Beijing, China

Xianwu Tang