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Double-frequency signal detection and location method and special locator for power overhead line fault

A dual-frequency signal and line fault technology, applied in the direction of the fault location, etc., can solve the problems of low frequency, inconvenient operation, weak electromagnetic induction, etc., achieve the effects of fast speed, shorten power failure time, and overcome misjudgment

Active Publication Date: 2016-03-23
SANMING POWER SUPPLY COMPANY OF STATE GRID FUJIANELECTRIC POWER +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the frequency is too low and the electromagnetic induction is weak, the detector can only be detected by contact, which is very inconvenient to operate and has great potential safety hazards

Method used

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  • Double-frequency signal detection and location method and special locator for power overhead line fault
  • Double-frequency signal detection and location method and special locator for power overhead line fault
  • Double-frequency signal detection and location method and special locator for power overhead line fault

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Embodiment Construction

[0046] Such as Figure 1-6 As shown, the dual-frequency signal detection and positioning method for electric overhead line faults of the present invention is based on the fact that the impedance properties of the faulty line and the non-faulty line are different, and the two frequencies present different impedances, so that the signal currents of the two frequencies have different Therefore, different ratios of signal currents are used as the criterion to quickly and accurately select the ground fault line and locate the fault point, and use the same criterion to detect short-circuit faults, realizing the combination of grounding and short-circuit faults.

[0047]The specific method for detecting the ground fault line is: first cut off the power supply of the fault line, stop the power supply of the fault line, release the outgoing switch 1 for standby, and check the fault line 8 on the outside of the switch 1 to confirm that there is no voltage, so as to detect and locate the ...

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Abstract

The invention discloses a method for detecting and locating a faulty dual-frequency signal of an electric power overhead line and a special locator thereof. The method injects a dual-frequency signal current into a faulty phase line, and then uses a dual-frequency signal detector to detect the signal current. The ratio of the difference between the fault line and the non-fault line is used as the criterion for the faulty line and the non-faulty line. The range is greatly improved, and the accurate judgment of high-resistance grounding faults is realized; its special locator injects signals after the fault line is powered off, and it is an independent system that has no connection with the equipment in the substation and will not affect the safety of equipment in the station; away from the wires , The detection work is safe and fast.

Description

technical field [0001] The invention relates to the technical field of power line fault location, in particular to a method for detecting and locating a fault of a power overhead line with a dual-frequency signal and a special locator thereof. Background technique [0002] At present, the neutral point of the small current grounding system (6KV, 10KV, 35KV) is not grounded or grounded through the arc suppression coil. Insulation causes great harm, and may even lead to phase-to-phase short circuit faults, posing a great threat to the safe and stable operation of the power grid! However, the detection of single-phase ground fault is very difficult! Therefore, how to detect the single-phase ground fault and locate the fault point at the first time has become a technical problem to be solved urgently. The single-phase ground fault detection technology has been continuously researched and discussed at home and abroad. Since the early 1980s, my country has introduced different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 杜海滨
Owner SANMING POWER SUPPLY COMPANY OF STATE GRID FUJIANELECTRIC POWER