A Fault Location Method for Overhead Distribution Network Based on the Cooperation of Fault Indicators and Distributed Intelligent Terminals

Abstract

The invention relates to a fault indicator and distributed intelligent terminal matched overhead distribution network fault positioning method, and belongs to the technical field of relay protection of power systems. On the premise that overcurrent relay protection of a traditional distribution network is not changed, distributed intelligent terminals are installed on circuit breakers at all trunk section points and fault indicators are installed on all branch circuits, the installation positions of the distributed intelligent terminals are taken as nodes, a relation between the fault indicators and the nodes is defined according to the positions of the nodes and the fault indicators, and trunk units and branch units are divided and numbered to form a unit adjacency list. When faults occur, an automatic reclosing lock recloses transient faults, the distributed intelligent terminals isolate permanent faults, and meanwhile, the distributed intelligent terminals and the fault indicators detect current values and compare maximum branch current values in the relevant unit adjacency list to position trunk faults and branch faults.

Description

technical field [0001] The invention relates to a fault location method for an overhead power distribution network in which a fault indicator and a distributed intelligent terminal cooperate, and belongs to the technical field of electric power system relay protection. Background technique [0002] With the continuous acceleration of my country's economic development, the power supply is also increasing year by year, making the requirements for the safe and reliable operation of urban and rural distribution networks increasingly high. [0003] In actual operation, the distribution network spreads across cities, villages and mountainous areas. It has been affected by lightning, wind, rain and frost for many years, and increasingly severe environmental pollution. Coupled with some unpredictable human factors, the probability of failure is very high. Statistics show that most of the faults in the power grid occur in the distribution network. According to relevant statistics, i...

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Problems solved by technology

[0026] The centralized control system does not require the outlet circuit breaker to cooperate with reclosing, and will not cause multiple overcurrent impacts on the system. It is applicable to both overhead and cable lines. The disadvantage is that it needs communication channels and distribution network master stations, and the investment Large, mainly suitable for areas with high requirements for power supply quality in cities

[0032] The network protection system can realize the seamless self-healing of cable ring network faults, and is suitable for occasions that have high requirements for power supply quality. The disadvantage is that the investment is relatively large

Since the distributed intelligent terminal cannot be used in large quantities, it can only roughly judge and isolate the fault section, while the fault indicator has no remote control function and cannot isolate the fault, but it can be used to judge the fault branch

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