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With the rapid advancement of the economy and society, the demand for an uninterrupted, reliable supply of energy within power systems is increasing. However, fault current is much smaller than load current during single-phase ground fault, making it difficult to detect the fault, which could lower the power quality. To ensure the high-reliable power supply, this paper proposes a SPG fault location technology based on the norm of current fault components. This technology obtains the phase-current signal through Feeder Terminal Unit (FTU), and uses the phase-current subtraction before and after the moment of the fault to obtain the current fault component, avoiding the influence of the load current on the fault characteristics. At the same time, the positive-sequence, negative-sequence, and zero-sequence currents are obtained according to fault components. Then, the ratio of the norm of the column vectors is calculated, and the magnitude of the result against the adaptive threshold is then calculated to complete the distributed ground fault location. Finally, ATP (Alternate Transients Program) simulation is used to verify the reliability of our proposed technology.
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