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High-reliability fault traveling wave range finding method and device of power distribution line

A technology of fault traveling waves and power distribution lines, applied in the direction of fault location, information technology support system, etc., can solve the problems of low success rate, untimely, failure to specify the fault location, etc., achieve small equipment size, avoid false alarms, and improve reliability effect

Inactive Publication Date: 2016-11-23
山东安亚电子信息有限公司 +1
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Problems solved by technology

It is very effective for phase-to-phase short-circuit faults, but the success rate for single-phase ground faults, which account for the vast majority of faults, is low, and its function is fault segmentation, and it cannot specify the specific fault location
[0006] Moreover, whether it is a single-ended traveling wave distance measurement method or a double-ended traveling wave distance measurement method, a large number of non-fault interference traveling waves will be generated during the operation of complex distribution lines. If the traveling wave triggering depends on the set threshold And records, if the threshold is set too high, it is very likely that the fault traveling wave cannot be triggered correctly, if it is set too low, a large amount of invalid data will be obtained, although the real fault traveling wave may also be included, but basically It is impossible to automatically eliminate interference, and it is unrealistic and timely to rely on manual selection

Method used

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  • High-reliability fault traveling wave range finding method and device of power distribution line

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Embodiment Construction

[0017] Embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0018] During specific use:

[0019] The three-phase phase voltage of the power distribution network is monitored in real time through the data acquisition device, and the traveling wave data is collected in real time. When it is detected that the voltage drops below the set threshold, the power frequency phase voltage and traveling wave data within ±20ms at this moment will be recorded The data is locked and uploaded to the master station, and the fault traveling wave is analyzed from the traveling wave within this period of time.

[0020] The theoretical basis is: when a single-phase ground fault occurs (accounting for 70% of the total line faults), the voltage of the faulty phase drops and the voltage of the non-faulty phase rises; (accounting for 10%), the two fault phase voltages all drop, and the non-fault phase voltage rises; there are few three-phas...

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Abstract

The invention relates to a high-reliability fault traveling wave range finding method and device of a power distribution line, and belongs to the technical field of relay protection of a power system. According to the method, power-frequency fundamental-wave voltage drop serves as a starting condition, traveling wave data in periods before and after the drop time is collected, and a fault travelling wave is screened from the travelling wave data in the periods. Thus, the fault traveling wave can be accurate searched from interference travelling waves, the fault is prevented from missing report and report errors, and the reliability of the fault range finding device is improved.

Description

technical field [0001] The invention relates to a high-reliability method and device for fault traveling wave distance measurement of power distribution lines, belonging to the technical field of electric power system relay protection. Background technique [0002] The power transmission of the power system is divided into power transmission and power distribution. The transmission line adopts high voltage (above 110kV), long distance (up to hundreds of kilometers), generally has no branches, and the neutral point is directly grounded, and it will trip directly after a fault occurs. The distribution line adopts medium and low voltage (35kV, 10kV, etc.), and the distance is short (a dozen or tens of kilometers); generally, there are many branches (especially 10KV lines), and the neutral point is not directly grounded (such as grounding through the arc suppression coil). ), it will not trip after a single-phase ground fault occurs, but it must be repaired as soon as possible....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 陈宗军李桂义李义明张波郭春龙
Owner 山东安亚电子信息有限公司
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