Small current ground fault location method based on Hilbert transform

A new method for small current grounding system single-phase-to grounding fault location used transient component and Hilbert transform is proposed. The feeder terminal unit detects zero-mode current and line voltage signals, First, perform the Hilbert transform on the transient line voltage, Then multiply the line voltage after the Hilbert transform with the zero-mode current, defined the product as fault direction parameter. The FA master determines the line segment where the fault point is located based on the characteristics of the opposite polarity of the front and rear direction parameters of the fault point. The results of digital simulation prove that the proposed method has certain feasibility.