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Undercurrent single-phase earth fault line selection and positioning apparatus

A single-phase ground fault and positioning device technology, applied in the direction of the fault location, etc., can solve the problems of increasing labor intensity and low work efficiency of the staff, and achieve the effects of saving labor intensity, accurate judgment, and reducing large-scale power outage accidents

Inactive Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +1
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  • Summary
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AI Technical Summary

Problems solved by technology

[0004] However, the traditional search for single-phase ground faults mainly relies on manual work to find the fault point, which has very low work efficiency and increases the labor intensity of the staff

Method used

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  • Undercurrent single-phase earth fault line selection and positioning apparatus

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Embodiment Construction

[0014] The technical solutions of the present invention will be described in further detail below through specific implementation methods.

[0015] Such as figure 1 As shown, a small current single-phase ground fault line selection and positioning device, which includes a host, a bus PT for collecting the three-phase voltage of the distribution network system bus, and two sets of sensors;

[0016] Wherein, the sensors include a bus outlet sensor 11 for collecting wavelet electromagnetic signals at the bus outlets of the distribution network system, three branch sensors 12 for collecting wavelet electromagnetic signals on branch phase lines, and a wireless transmission unit. The bus outlet sensor 11 and the three branch sensors 12 are respectively connected to the wireless sending unit;

[0017] The host includes an operation control unit, a ground fault monitoring circuit, a wavelet signal transmitter and a wireless receiving unit, and the ground fault monitoring circuit is c...

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Abstract

The invention provides an undercurrent single-phase earth fault line selection and positioning apparatus. The undercurrent single-phase earth fault line selection and positioning apparatus comprises a host, a bus PT for acquiring three-phase voltage of a bus of a power distribution network system and at least one group of sensors. The sensors comprise a bus outlet wire sensor, three branch sensors and a wireless sending unit. The bus outlet wire sensor and the three branch sensors are respectively connected with the wireless sending unit; and the host comprises an operation control unit, and an earth fault monitoring circuit, a wavelet signal emitter and a wireless receiving unit which are connected with the operation control unit, the earth fault monitoring circuit is connected with the bus PT, the wavelet signal emitter is connected with the neutral point of the bus PT, and the operation control unit carries out wireless communication with the sensors. According to the invention, the trouble of manually searching for fault points along a line is overcome, and the apparatus also has the advantages of accurate fault determination, high line selection accuracy and rapid fault positioning.

Description

technical field [0001] The invention relates to the field of distribution network fault monitoring, in particular to a small current single-phase ground fault line selection and positioning device. Background technique [0002] After a single-phase ground fault occurs in the power distribution equipment, intermittent arcing grounding may occur, resulting in resonant overvoltage and overvoltage several times the normal voltage. The overvoltage will further cause insulation breakdown of the insulator on the line, resulting in a serious short circuit accident ; Serious single-phase ground faults may destroy the stability of the regional power grid system and cause greater accidents. [0003] At present, due to the influence of the environment, equipment and users, the fault frequency of the 10kv distribution network has been relatively high, and because the distribution network is complex and involves a wide range of areas, it is difficult to find faults. With the continuous i...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 彭勇李军余红刘蓉余凯生
Owner STATE GRID CORP OF CHINA
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