Low-voltage transformer area line fault positioning system based on intelligent circuit breakers

Abstract

The invention provides a low-voltage transformer area line fault positioning system based on intelligent circuit breakers. The system comprises a low-voltage transformer area distribution network anda monitoring center, wherein the intelligent circuit breakers have selectivity when encountering an electrical fault, and can freely set the tripping time or select different tripping times; the intelligent circuit breakers are used for setting the current-level circuit breaker close to the fault point to be tripped and opened preferentially when a line fault occurs between the two levels of intelligent circuit breakers, and sending the fault information to the monitoring center; and the monitoring center is used for acquiring the fault point information through an intelligent distribution transformer terminal TTU, sending an instruction to control the upper-level intelligent circuit breaker and the lower-level intelligent circuit breaker of the fault point to be opened, controlling an interconnection switch to be connected at the same time, supplying power to a fault-free area, and isolating the fault area. According to the invention, fault positioning of a distribution line of a public transformer area of the national power grid can be realized, the fault points of the transformer area are isolated, power supply is recovered outside the isolation area, the fault response speed isimproved, the fault influence is reduced to the minimum, the equipment is reasonably put into operation, and the equipment loss is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to an intelligent circuit breaker-based line fault location system in a low-voltage station area. Background technique [0002] With the development of society, the scope of grid laying is getting wider and wider. The ensuing problem is that grid failures are frequent and complex. When a grid failure occurs, the monitoring center can only know the grid failure based on the feedback from residents or power consumers. Failure to know the fault situation in time will affect the reliability of power supply, and if the grid faults are simply checked and repaired manually one by one, the workload will be too large. [0003] At present, the line fault location technology on the medium and high voltage side is relatively mature, but the low voltage side is in a blank state. After a fault occurs, all lines will be powered off, which will have a great impact. [...

AI Technical Summary

Problems solved by technology

[0002] With the development of society, the scope of grid laying is getting wider and wider. The ensuing problem is that grid failures are frequent and complex. When a grid failure occurs, the monitoring center can only know the grid failure based on the feedback from residents or power consumers. Failure to know the fault situation in time will affect the reliability of power supply, and if the grid faults are simply checked and repaired manually one by one, the workload will be too large

[0003] At present, the line fault location technology on the medium and high voltage side is relatively mature, but the low voltage side is in a blank state. After a fault occurs, all lines are powered off, which has a great impact. The response time after the fault is slow, and the fault situation needs to be reported to the site.

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