Electrified locating device for single-phase earth fault of electric distribution network

Abstract

The invention discloses an electrified device for locating a single-phase earth fault of an electric distribution network. The device is suitable for non-effective neutral grounding electrical networks of 3-60kV. The locating device consists of two parts, i.e. an upper position machine and an lower position machine, wherein the upper position machine is arranged in a transformer substation, is used for measuring and transmitting bus zero-sequence voltage signals, and consists of an A / D, a CPU, a mobile communication module and a GPS module; the lower position machine is a handheld device for carrying out mobile detection on a circuit, is used for measuring zero-sequence current signals and finishing location calculation, and consists of a phase-current measuring device and a locating device; the phase-current measuring device consists of a current transducer, an A / D and a Bluetooth wireless transceiver module, and is used for measuring three-phase current signals; and the locating device consists of a CPU a Bluetooth wireless transceiver module, a mobile communication module and a GPS module, and is used for synthesizing the zero-sequence current signals, receiving zero-sequence voltage signals and finishing location calculation. The invention has mature technology and high reliability.

Description

technical field [0001] The invention belongs to a kind of electric power technology and equipment, which is suitable for 3-60kV neutral point non-effectively grounded power grid, and can accurately locate when a single-phase grounding fault occurs and operates with a fault. Background technique [0002] The 3-60kV distribution network in my country widely adopts the non-effective neutral point grounding method, also known as the small current grounding system, and most of the faults in the small current grounding system are single-phase grounding faults. When a single-phase ground fault occurs, the ground current is very small, and it can continue to run for 1 to 2 hours under the fault condition, but the fault point must be found as soon as possible, which raises the problem of live fault location. [0003] The problem of live location of single-phase ground fault in distribution network has not been well solved for a long time. Manual line inspection not only consumes a lo...

AI Technical Summary

Problems solved by technology

This positioning method has a high fault location accuracy after a power outage of the line. However, power outage measures must be taken for the line before it can be applied, so that the line that can supply power must be powered off, which affects the reliability of power supply and the power consumption of users.

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