Leakage current vector break variable detection-based lighting circuit safety protector

Abstract

The invention discloses a leakage current vector break variable detection-based lighting circuit safety protector, which comprises a controller, a leakage current transformer, an automatic reclosing device and a circuit breaker, wherein the controller mainly finishes real-time sampling of leakage current, vector break variable calculation of the leakage current, tripping protection and reclosing control; the leakage current transformer finishes detection of the leakage current; the automatic reclosing device is matched with the controller to achieve an automatic reclosing operation; and the circuit breaker is an output device of the lighting circuit safety protector. The leakage current of a lighting circuit is detected in real time and break of the leakage current on the lighting circuit is judged through vector calculation, so that normal leakage current of the lighting circuit and the leakage current caused by a fault are accurately identified; the faulty circuit is removed in a targeted manner; and normal operation and safe operation of the circuit are ensured.

Description

technical field [0001] The invention relates to a lighting line safety protector based on the detection of leakage current vector mutation, and belongs to the technical field of power distribution equipment and safety protection. Background technique [0002] At present, as a new concept and new practice of future urban development, smart city has become an important means for local governments to upgrade urban construction. Municipal road lighting is an important part of municipal public facilities and an important part of smart cities. Municipal road lighting covers every corner of the city. The safety of lighting lines directly affects the safety of public life and property, and also affects the image of the city and public satisfaction with social services. [0003] In practical applications, lighting lines have the characteristics of complex wiring, various wiring methods, harsh outdoor operating environment, and easy access by pedestrians; Exposure due to damage or b...

AI Technical Summary

Problems solved by technology

[0003] In practical applications, lighting lines have the characteristics of complex wiring, various wiring methods, harsh outdoor operating environment, and easy access by pedestrians; Exposure due to damage or burnt, construction damage, and insulation damage caused by lightning strikes are widespread.

Due to the above-mentioned differences, the leakage current has a wide range of changes, which makes it very difficult to set the fixed value of the leakage protection of the lighting line. If the value is set too large, when people get an electric shock, they often cannot trip in time and accurately, and cannot effectively protect personal safety.

At the same time, in the current municipal lighting power supply system design, lighting lines are generally equipped with ordinary leakage protection circuit breakers for leakage protection. Ordinary leakage protectors only protect according to the detected leakage amplitude. When leakage occurs in a certain phase line, It is possible that the detected amplitude becomes smaller or does not change, resulting in failure to protect. This kind of leakage protector has a large protection dead zone, and ordinary leakage protectors do not have automatic reclosing function. If due to instantaneous fault or Disturbances such as lightning strikes cause the leakage protector to trip accidentally, and the line cannot automatically restore power supply, requiring maintenance personnel to go to the site to perform closing operations

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