Single-phase grounding fault identification and fault line selection for compensation grid

A new grounding fault line selection method based on small-world network theory is proposed in order to solve the problems existing in grounding fault line selection device of compensation grid, such as that the correct rate of grounding fault line selection is not high and the selection device cannot recognize high-impedance and low-impedance grounding fault. The small-world network models and characteristic parameters library of different grounding lines under different grounding-fault types are established and the grounding fault line can be correctly selected as basis of the models and library. Then the grounding fault line selection device was developed. And a low-voltage simulation grid is built in lab to test the device´s performance. The experiments show that the device can identify the type of fault and the correct rate of grounding fault line selection is satisfied.