Fault diagnosis method of power distribution network

Abstract

The invention relates to a fault diagnosis method of a power distribution network. The method comprises the following steps that equipment state information and switch motion information are obtained; currents, including an AC current and a zero-sequence current, of the primary side of a power transmission line are collected; the collected AC current value and zero-sequence value are compared with a preset short-circuit fault current threshold and a preset grounding fault current threshold respectively to determine present fault information; the processed equipment state information is compared with preset threshold information of a distribution terminal, and if the processed equipment state information is beyond a set range, it is determined that equipment has a fault; and the obtained switch motion information is compared with present power supply information of the power distribution network, and if the switch motion information at present is inconsistent with the power supply information, it is determined that a switch has a fault. Thus, a fault reason can be found, a fault point can be located accurately, power failure time for maintenance is reduced, the equipment utilization rate and the operational reliability are improved, and the maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for diagnosing faults in a distribution network, a method for diagnosing faults in a distribution network. Background technique [0002] my country's distribution network has the characteristics of complex line structure, diverse and changeable environment, frequent and complex faults, and heavy maintenance workload. When a fault occurs in a certain section of the distribution line, it is necessary to check the fault location section by section. Not only is the work intensive, but also the repair time will be delayed and the reliability of power supply will be affected. The normal use and service life of power grid terminal equipment such as meters have a great impact. At present, the grid voltage fluctuates greatly, especially in rural areas, and the grid voltage fluctuates even more; too high grid voltage often shortens the service life of grid terminal equipment,...

AI Technical Summary

Problems solved by technology

If a fault occurs in a certain section of the distribution line, it is necessary to check the location of the fault one by one. Not only is the work intensity high, but it will also delay the repair time and affect the reliability of power supply. The normal use and service life of power grid terminal equipment such as meters have a great impact

At present, the grid voltage fluctuates greatly, especially in rural areas, the grid voltage fluctuates even more; too high grid voltage often shortens the service life of grid terminal equipment, and sometimes even causes grid terminal equipment to burn out; and too low The grid voltage may cause the grid terminal equipment to fail to work normally

The current detection system and its detection method can only roughly detect the fault range, and cannot timely and effectively confirm and analyze the fault cause and fault point.