Line single-phase grounding detection system

Abstract

The invention discloses a line single-phase grounding detection system, which comprises a grounding current signal wireless transmitting device and an on-site detection device. The grounding current signal wireless transmitting device comprises a current transformer [1], a frequency modulation signal modulator [2] and a frequency modulation signal transmitter [3]. The on-site detection device is composed of a metal grounding signal collection device, a signal receiver and a signal intensity display. According to the method, manual pole climbing operation is completely not needed in detection,qualitative change is brought to single-phase grounding detection operation, the fault handling speed of a distribution network system can be increased, and the effect of the line single-phase grounding detection system is more outstanding at night or in severe weather such as wind and rain.

Description

technical field [0001] The invention relates to a line single-phase ground detection system used in the field of power distribution line fault location equipment. Background technique [0002] Difficulty in finding single-phase grounding fault points in 10kV to 35kV power systems has always been a major problem that plagues the operation of distribution networks. Whether it is arc suppression coil grounding or small resistance grounding, there will be fault points that are difficult to find by conventional inspection methods, resulting in fault handling. Trouble, frequent power failure and other serious problems. With the increasingly branched and cabled distribution network, various hidden faults, intermittent faults, high-resistance ground faults, etc. have brought great inconvenience to the search and positioning of single-phase ground faults and accident handling. [0003] For this problem, some electric power units have developed grounding search instruments based on t...

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Problems solved by technology

[0002] Difficulty in finding single-phase grounding fault points in 10kV to 35kV power systems has always been a major problem that plagues the operation of distribution networks. Whether it is arc suppression coil grounding or small resistance grounding, there will be fault points that are difficult to find by conventional inspection methods, resulting in fault handling. Trouble, frequent power failure and other serious problems

With the increasingly branched and cabled distribution network, various hidden faults, intermittent faults, high-resistance ground faults, etc. have brought great inconvenience to the search and positioning of single-phase ground faults and accident handling.

[0003] For this problem, some power units have developed grounding search instruments based on the fifth harmonic method or the principle of signal injection. However, the grounding search equipment in the prior art generally has inaccurate positioning accuracy and high-impedance grounding search difficulties, which makes popularization and use difficult. big limit

Some more advanced fault indicators now also have the function of grounding indication. However, it is impossible to install fault indicators densely. For lines with many branches or long distances, the help for on-site search is still limited.

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