A Quick Disposal Method for Single-phase Disconnection Fault of 10kv Line

Abstract

The invention belongs to the technical field of power distribution lines, and discloses a method for quickly disposing of single-phase disconnection faults of 10kV lines. By extracting the characteristics of voltage, current, and phase monitored by switches, it integrates voltage-time feeder automation and differential relay protection. 10kV disconnection and grounding faults are processed at the minute level to realize fault analysis and identification, single-phase disconnection fault location, single-phase disconnection fault isolation, and restoration of power supply in non-fault areas, so as to avoid long-term disconnection faults from causing wildfires, Personal electric shock, equipment damage and other problems, improve the safety and reliability of power supply.

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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