A Centralized Fault Area Discrimination Method

Abstract

The invention discloses a centralized fault area discrimination method. According to the invention, an electronic transformer or an optical transformer is respectively installed at two ends of each line in a regional power grid and a cable-overhead line junction; the installation points are defined as measuring points; a centralized fault area discrimination device is arranged at a central substation; and the device receives data of all the measuring points for comprehensive analysis processing and recognizes a fault area after breakdown. Thus, rapid positioning and maintenance of the fault are realized, and power supply recover capability of the system is accelerated after the breakdown. By the method, a fault area in a regional power grid can be recognized rapidly and accurately according to fault current characteristics of each measuring point, rapid positioning and maintenance of faults are realized, and power supply recovery of a system after breakdown is accelerated.

Description

technical field [0001] The invention relates to a method for discriminating a centralized fault area. Background technique [0002] Due to the limitation of urban space and planning, overhead line and cable hybrid lines are more and more widely used in large and medium-sized cities. Because overhead line faults are generally instantaneous faults, reclosing needs to be started, and for cable faults, it is generally a permanent fault, and reclosing will cause greater damage to the cables, so blocking reclosing is required. When the overhead line-cable hybrid line fails, the maintenance personnel must first find out the fault point and find out whether the fault point is located in the overhead line or the cable section. Order, which puts forward high requirements for maintenance personnel, and at the same time consumes a lot of manpower and material resources. [0003] Due to the limitation of the installation volume and cost of traditional electromagnetic current transforme...

AI Technical Summary

Problems solved by technology

These methods generally have the disadvantages of complex algorithms and low precision, especially in the application of short-term or multi-level hybrid lines, which are difficult to adjust and have large errors.

At the same time, because these methods are integrated in the line protection device, on the one hand, the complexity of the protection device is increased, and on the other hand, the fault location information is scattered, which is not conducive to the centralized analysis of the operation and maintenance personnel.

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