AC switch cabinet arc light detection system and method

Abstract

The invention discloses an alternating-current switch cabinet arc light detection system and method, and relates to the field of switch cabinets. In the invention, an arc light probe 1 acquires a light signal in a switch cabinet and transmits the light signal to a comparator and an ADC pin of a processor through a photoelectric conversion unit; the comparator compares the received voltage signal with a preset reference voltage and transmits a comparison result to the processor; and the processor performs judgment according to a comparison result of the comparator or information data acquired and processed by the ADC pin. Light signals in the switch are detected through the arc light probe and then transmitted to the comparator and the ADC pin of the processor, the arc light signals are compared with preset reference voltage through the comparator, rapid detection of a strong arc light fault is achieved, the arc light signals are processed through the processor, and the arc light faultdetection accuracy is improved. By utilizing the characteristic of periodic change of arc light intensity, signal analysis is carried out in a frequency domain, detection of weak arc light is achieved, and the anti-interference capability is strong.

Description

technical field [0001] The invention belongs to the technical field of switch cabinets, in particular to an arc detection system and method for an AC switch cabinet. Background technique [0002] Medium and low voltage switchgears have been in operation for many years. Environmental pollution, insulation damage, and loose joints in the cabinet can easily lead to electrical failures, and are often accompanied by arc lights of different intensities. In order to enhance the safety performance, some important occasions are equipped with an arc protection system in the switchgear, which can realize fast fault detection and removal through arc detection. Compared with the traditional overcurrent protection device, it can greatly shorten the protection action time and reduce equipment damage and power failure. Loss. [0003] Usually, the arc protection system includes several arc probes that collect light. The mainstream ones include visible light arc probes and ultraviolet light ...

AI Technical Summary

Problems solved by technology

[0005] In order to ensure that the arc light detection device has the ability to detect weak arc light and enhance the safety performance of the system under the premise that normal light does not cause misoperation; now an AC switchgear arc light detection system and its method are designed. Its working principle is as follows: In the AC switchgear, the voltage and current run at a specific frequency f, and the arc associated with the electrical fault also has a corresponding time characteristic. The optical power of the arc pulse changes at a frequency of 2f, and the peak value of the arc intensity will appear larger with different events. Great disparity, but the frequency characteristic of 2f always exists

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