10kV line single-phase broken line fault rapid handling method

Abstract

The invention belongs to the technical field of distribution lines, and discloses a 10kV line single-phase broken line fault rapid handling method, which performs minute-level handling on a 10kV broken line grounding fault by extracting the characteristics of voltage, current, phase and the like monitored by a switch and fusing the related technologies of voltage time type feeder automation and differential relay protection. Fault abnormity analysis and identification, single-phase broken line fault positioning, single-phase broken line fault isolation and non-fault area power supply recovery are realized, the problems of forest fire, human body electric shock, equipment damage and the like caused by long-time existence of broken line faults are avoided, and the power supply safety and reliability are improved.

Description

technical field [0001] The invention relates to the technical field of power distribution lines, in particular to a method for quickly handling single-phase disconnection faults of 10kV lines. Background technique [0002] The 10kV distribution line is affected by external natural factors, equipment aging, external force damage and other factors, and disconnection faults often occur. The disconnection fault will cause the three-phase voltage and current on the load side to no longer be symmetrical, and the negative sequence and zero sequence components generated will be Causes serious damage to all types of loads, especially rotating equipment. In addition, disconnection faults will also form complex faults accompanied by grounding phenomena. If measures are not taken in time, they may develop into chain faults, resulting in personal casualties, fires, large-scale power outages, and equipment damage. [0003] At present, the detection and location of short-circuit faults in...

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Problems solved by technology

[0002] The 10kV distribution line is affected by external natural factors, equipment aging, external force damage and other factors, and disconnection faults often occur. The disconnection fault will cause the three-phase voltage and current on the load side to no longer be symmetrical, and the negative sequence and zero sequence components generated will be Serious damage to all types of loads, especially rotating equipment

In addition, disconnection faults will also form complex faults accompanied by grounding phenomena. If measures are not taken in time, they may develop into chain faults, resulting in personal casualties, fires, large-scale power outages, and equipment damage.

[0003] At present, the detection and location of short-circuit faults in distribution lines have been deeply studied at home and abroad, but less attention has been paid to disconnection faults.

Traditional power system relay protection judges ground faults and phase-to-phase short-circuit faults based on overcurrent characteristics, while the ground current and short-circuit current of disconnection faults are often very weak, especially at the end of the line. Traditional power system relay protection cannot handle disconnection Fault

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