Arc light protective device and method with light intensity signal recording function

Abstract

The present invention discloses an arc light protective device with light intensity signal recording function. The device comprises an arc light host unit, an arc light collection unit, arc light sensors, an arc light transmission fiber and a data transmission fiber. The arc light sensors are installed in the busbar room and the switch gear room of a medium and low voltage switch cabinet, the light intensity signals collected by the arc light sensors are transmitted to the arc light collection unit through the arc light transmission fiber, the arc collection unit is configured to perform photovoltaic conversion and AD sampling of the light intensity signals, and the sampling result is transmitted to the arc light host unit through the data transmission fiber; and after the arc light host unit receives the arc light analog signals, the arc light host unit performs arc light protection logic discrimination through combination of the electrical capacity signals. When the arc light faults happen, the device can record the electrical analog quantity prior to and after the protection motions and can record the light intensity analog signals so as to perform effective analysis of the transient process having faults and recover the whole fault evolution process. The present invention further discloses an arc light protective method with light intensity signal recording function.

Description

technical field [0001] The invention belongs to the technical field of power system protection, and in particular relates to an arc light protection technology when an arc fault is caused by a switch cabinet of a medium and low voltage system. Background technique [0002] With the rapid development of the domestic power industry, the number of 6 ~ 35kV medium and low voltage switch cabinets is increasing. Due to the many outlets, equipment insulation aging and mechanical wear, human error and other reasons, the probability of short-circuit accidents is high. The traditional medium and low voltage busbar protection mostly relies on the backup protection with a large delay to remove the fault on the busbar. Considering the setting and coordination, the time to remove the fault is generally more than 1s, and the time to remove the fault is long. The strong light, strong heat and explosion caused by the fault arc It will cause serious harm to equipment and personal safety, and...

AI Technical Summary

Problems solved by technology

The existing arc protection device only records the electrical analog quantity and input signal when a fault occurs, but does not record the arc light intensity analog signal

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