In case of single-phase grounding fault in small current grounding system, all lines with capacitance to the ground will have zero sequence current. However, due to the small zero sequence current and great dispersion, it is difficult to select the grounding line.

        The special distributed small current grounding line selection device for overhead line is a non master station distributed grounding line selection device based on high-precision measurement technology, also known as "distribution line fault indicator". It is an innovative and complete technical solution for the existing problems and main pain points of single-phase grounding fault location in current distribution network and to meet the needs of future distribution network construction and development.

        The distributed small current grounding line selection device adopts the design of high-end current transformer and integrates the optimized transient and steady-state algorithms and analysis criteria to realize the timely and accurate location and isolation of grounding faults, which provides an important guarantee for the safe and reliable operation of distribution network. The equipment is mainly used for single-phase grounding fault location of overhead lines in distribution network, and can also realize the indication function of short-circuit fault.

        When a fault is found in the overhead line distributed grounding line selection device, the alarm light sends an alarm signal. GPRS wireless communication equipment can be installed at the same time, upload the fault information to the background and notify the operation and maintenance personnel.