Single-phase earth fault finding device

Abstract

The invention provides a single-phase earth fault finding device; a high voltage signal and an ultra-low-frequency constant current signal are injected into an earth fault line for receiving a fault leakage current signal in a wireless mode, and a single-phase earth fault point is found and positioned; the device comprises a high voltage signal source, an ultra-low frequency signal generator, a signal conditioner, an A / D converter, a single chip microcomputer, a display, a high voltage current clamp, a current signal collecting module, a wireless signal sending module, a wireless signal receiving module, a signal processing module, a liquid crystal display and a warning module. According to the single-phase earth fault finding device, a practical investigation tool is provided for electric power workers after the electric transmission line has a single-phase earth fault; through the device, the single-phase earth fault can be conveniently positioned, and the device has the characteristics that the device is practical, and portable and saves both labors and time.

Description

technical field [0001] The invention relates to a power equipment monitoring device, in particular to a search device for a single-phase grounding fault in a power transmission line. technical background [0002] Single-phase ground fault is one of the most common phenomena in transmission line faults, especially the 10KV line of the distribution network system. Due to the wide distribution of lines and many branch circuits, it is especially serious in rural and mountainous areas. Tree barriers, insulator breakdown, single-phase disconnection, small animal hazards, humidity, insulator failure, arrester short-circuit and many other factors cause many types of single-phase ground faults, which are difficult to deal with and have limited testing methods. At present, most of the power system operations use small current line selection devices to find the circuit where a single-phase ground fault occurs. After the fault circuit is determined, it is necessary for the staff of the...

AI Technical Summary

Problems solved by technology

After the fault circuit is determined, it is necessary for the staff of the power department to find the fault point. The only way to find the fault point is to use the traditional visual inspection method. There is no special instrument for searching along the line. It takes a lot of manpower, financial resources and material resources to find a fault point.

Especially in mountainous and hilly areas, the transportation is inconvenient. When dealing with special ground faults, electric workers need to go up to each pole to find them, which makes it more difficult to find them.

Sometimes after a line outage caused by a single-phase ground fault, it is difficult to determine the fault point for two or three days, causing the power supply qualification rate of the power grid to drop greatly. It is very useful to research and develop a single-phase ground fault inspection device specially for electric workers. significance

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