Method and system for locating short-circuit fault in distribution network

Abstract

The invention discloses a method and a system for locating short-circuit faults of power distribution networks. The method includes mounting a power distribution terminal for a switch of each feeder line; receiving data monitored by the power distribution terminals in real time, and computing average currents of the various switches; computing fault judging values of the various witches and judging whether faults occur in circuits where the switches are positioned; topologically analyzing the networks by the aid of states of the switches and dividing regions; traversing the regions connected with the switches with fault symbols, and locating certain regions as fault regions; enabling servers of master stations to compute fault discrimination values of the various fault regions; locating short-circuit fault regions by the aid of the fault discrimination values. Fault currents only can flow into the certain regions without flowing out of the certain regions which are located as the fault regions. The system comprises an information acquisition unit, a network topology unit and a computing unit. The method and the system have the advantages that the short-circuit faults of the power distribution networks can be quickly located by the aid of the method and the system; operation procedures implemented by the aid of a computing process are simple, and accordingly program resources can be saved; the operation procedures can be simplified, and accordingly the operation time and the program resources further can be saved.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a short-circuit fault location method and system for a distribution network. Background technique [0002] The development of smart distribution network puts forward requirements for fast fault location of distribution network, especially short-circuit fault location. On the one hand, realizing fast fault location of distribution network is a necessary condition to improve the safety and reliability of distribution network. The painful lessons of major power grid accidents at home and abroad show that building a distribution network that can quickly Recover and effectively reduce accident losses; on the other hand, the construction of smart distribution network and the complexity of distribution network provide an objective requirement for fast fault location of distribution network: advanced communication technology (equipment, channel, protocol) provides real-tim...

AI Technical Summary

Problems solved by technology

[0003] However, the existing technologies are mainly aimed at the research of safety early warning and preventive control of the distribution network, and there are few for fault location, especially short-circuit faults, and the existing inventions do not have measures to quickly locate short-circuit faults

Images