Large-current medium-voltage switch cabinet capable of realizing arc light protection

Abstract

The invention provides a large-current medium-voltage switch cabinet capable of realizing arc light protection. The switch cabinet comprises a sensor which is used for collecting an arc light signal of the medium-voltage switch cabinet, a photoelectric transducer which is used for converting the arc light signal from the sensor into a current signal to be output, a current transformer which is used for sampling a current of the medium-voltage switch cabinet and outputting the current signal, and an arc short-circuit protection system control unit which is used for receiving signals from the photoelectric transducer and the current transformer simultaneously and making a tripping operation order to a circuit breaker to ensure that the circuit breaker rapidly trips. According to the invention, the fault of an electric distribution network, caused by the arc light short-circuit, in the prior art is solved. Through adopting an arc and overcurrent dual-criterion principle, when arc light occurs, the large-current medium-voltage switch cabinet accurately judges the arc light to ensure that the circuit breaker rapidly trips so as to prevent the arc light from damaging electric equipment, such as the medium-voltage switch cabinet and the like and immediately protect the safety of the personnel and the equipment in real time, thus the arc light protection can be realized.

Description

technical field [0001] The patent of the present invention relates to a new type of high-current medium-voltage switchgear that can realize arc light protection. Background technique [0002] Arc short circuit is the most serious fault in the distribution network, especially when it occurs inside the medium-voltage switchgear. Due to the arc resistance, the short-circuit current often does not reach the set value of over-current speed, and the fault cannot be quickly cut off, and the arc continues. As a result of the combustion, huge amounts of energy are released, with catastrophic consequences. The arc short-circuit fault of the switchgear often develops into a medium-voltage bus fault because it is not cleared in time, and its harm is very serious, such as causing the collapse of power consumption in power plants, power outages for important users, and more seriously causing multiple sets of switchgears to be connected at the same time. In recent years, it is not uncommo...

AI Technical Summary

Problems solved by technology

[0002] Arc short circuit is the most serious fault in the distribution network, especially when it occurs inside the medium-voltage switchgear. Due to the arc resistance, the short-circuit current often does not reach the set value of over-current speed and cannot quickly cut off the fault, and the arc continues. The result of the combustion is the release of enormous amounts of energy with catastrophic consequences

The arc short-circuit fault of the switchgear often develops into a medium-voltage bus fault because it is not cleared in time, and its harm is very serious, such as causing the collapse of power consumption in power plants, power outages for important users, and more seriously causing multiple sets of switchgears to be connected at the same time. In recent years, it is not uncommon for the main transformer to be damaged due to the huge short-circuit current impact of the bus fault, and these accidents have caused major economic losses.

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