Switchgear arc light detection and protection system

Abstract

The invention discloses an arc light detection and protection system for switchgear. The arc light detection and protection system is characterized in that the system includes a plurality of arc light detecting devices and a plurality of current transformers; the arc light detecting devices and the current transformers are connected with a main control unit; and the main control unit is connected with a plurality of circuit breakers. The main control unit detects signals of the arc light detecting devices and the current transformers and judges whether a circuit in the switchgear breaks down or not through arc light and over-current at the same time. If faults are detected, the circuit breakers work and cut power supply of the fault circuit. By adopting the above technical scheme, the system provided by the invention is low in cost and powerful in fault detection function. Most importantly, faults can be cleared quickly for reducing lasting time of fault arc, so that fault arc can be limited fundamentally and harm to equipment and workers due to various effects of fault arc can be avoided and damage on the switchgear caused by arc light can be reduced in the maximum degree. At the same time, fault expansion is prevented. The system is good in application prospect.

Description

technical field [0001] The invention relates to the field of arc light protection equipment, in particular to a switch cabinet arc light detection and protection system. Background technique [0002] Compared with electrical equipment such as transmission lines, generators, motors and transformers, the failure probability of switchgear flashover is relatively low. However, due to flashover of switchgear bus insulators, circuit breakers, and isolating switch bushings, misoperation by operating personnel, and damage to medium and low voltage busbars by small animals, switchgear flashover failures occur from time to time. Usually, the switchgear is sealed, and the bus is connected inside, and there are many electrical components connected to the bus. When the bus fails, all these electrical components will be powered off, and the affected area is large and the consequences are serious. At present, the medium and low voltage busbars with a voltage level below 35kV in my country...

AI Technical Summary

Problems solved by technology

However, due to the flashover of switchgear bus insulators, circuit breakers, and isolating switch bushings, misoperation by operators, and the damage of medium and low voltage busbars by small animals, switchgear flashover failures occur from time to time.

Usually, the switchgear is sealed, and the busbar is connected inside, and there are many electrical components connected to the busbar. When the busbar fails, all these electrical components will be powered off, and the affected area is large and the consequences are serious.

At present, the medium and low voltage busbars with a voltage level below 35kV in my country generally do not have special busbar protection installed regardless of the number of outgoing lines and the degree of complexity.

The internal arc fault of the switchgear is a very serious fault in the power distribution system. Its occurrence will cause disastrous consequences. The various fault arc effects produced by the huge energy released by the internal arc combustion will seriously burn expensive switches. Equipment, short-circuit current impact can damage the main transformer, resulting in long-term power outages

What's more, it will also cause casualties of nearby staff

As far as the currently applied medium and low voltage busbar short circuit protection scheme is concerned, it cannot meet the requirements for fast action of arc faults inside the switchgear. It is necessary to introduce a new special protection scheme to solve the problems of modern power systems and factories and mines to improve power supply reliability and reduce power outage time. question

Images