10kV power distribution line disconnection fault judging method based on three-phase voltage current

Abstract

The invention discloses a 10kV power distribution line disconnection fault judging method based on three-phase voltage current. The 10kV power distribution line disconnection fault judging method comprises the following steps: obtaining voltage and current information of each node of a power distribution network; determining a line with faults according to the acquired current information of the power distribution network, and judging whether the line with the faults has a line disconnection fault; judging the line disconnection fault to be a single-phase line disconnection fault or a multi-phase line disconnection fault; judging a specific fault type of the single-phase line disconnection fault or the multi-phase line disconnection fault; forwards or backwards comparing whether the voltage information of each node is consistent or not, and determining a specific fault section. The 10kV power distribution line disconnection fault judging method has the beneficial effects that judgment on single-phase line disconnection and a grounding complex fault thereof can be carried out by virtue of the acquired voltage current information, and accurate detecting and positioning can be carried out on multi-phase line disconnection and grounding complex faults thereof, so that fault handling time is shortened.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of power distribution lines, in particular to a method for judging disconnection faults of 10kV power distribution lines based on three-phase voltage and current. Background technique [0002] Generally speaking, the distribution network refers to the power network with a voltage level of 35kV and below, and its function is to supply power to various distribution stations and various electric loads in the city. At present, the power distribution lines in most cities in my country use 10kV voltage level to supply power to users. Distribution lines have a wide distribution area and a long total length, but the operating environment is harsh, and they are prone to disconnection faults due to lightning strikes, external mechanical forces, and line load overloads, which seriously threaten the safety and reliability of power supply. After a disconnection fault occurs in the line, the voltage qu...

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Problems solved by technology

[0006] ①The above-mentioned documents are all aimed at the treatment methods proposed for single-phase disconnection faults. There is no sufficient analysis for additional ground faults, especially for multi-phase disconnection faults. The solution is relatively single, and it is difficult to judge the type of fault;

[0007] ②By detecting the negative sequence current and voltage as the judgment basis, it is necessary to add equipment on the load side, which increases the workload of investment and equipment operation and maintenance;

[0008] ③By comparing the phase difference of voltage and current as the basis for judgment, it is easy to cause misjudgment under special load type conditions, and the reliability is difficult to guarantee;

[0009] ④ It is still difficult to accurately determine the fault section by dividing the area to determine the fault location, and it is necessary to assist manual inspection to determine the specific fault point

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