Fault detection method and system of electric energy meter liquid crystal device

Abstract

The invention discloses a fault detection method and system of an electric energy meter liquid crystal device. The system comprises an installation machine box, a liquid crystal display and the function selection keys are embedded in the outer surface of the installation machine box, and an integrated circuit board is installed in the installation machine box; a main control chip is welded to theintegrated circuit board, the data input end of the main control chip is connected with a zero-sequence current detection module, and the command output end of the main control chip is connected witha circuit breaker protector and a sound-light alarm module; the zero-sequence current detection module comprises an external probe, the input end of the external probe is connected with an alligator clip, and the alligator clip is clamped on a circuit to be detected; the output end of the external probe is connected with a zero-sequence current transformer, the output end of the zero-sequence current transformer is connected with a linear operational amplifier, and the linear operational amplifier is further connected with a voltage comparator and an analog-to-digital conversion circuit. The fault detection method and the fault detection system can effectively detect the electric leakage phenomenon, send out the alarm timely, at the same time, realize the circuit protection, and enable theprobability of the safety accidents to be reduced.

Description

technical field [0001] The invention relates to the technical field of electrical circuit safety, in particular to a fault detection method and system for a liquid crystal device of an electric energy meter. Background technique [0002] The high-voltage power grid is not easy for people to touch, but the low-voltage power grid covers a large area, has a lot of electrical equipment, and there are more opportunities for people to touch it. Due to the damp of the electrical lines, the overload of electricity during the peak period of power consumption, the insulation of the household wires and lead wires is aging or damaged. , The rubber insulated wire sheath, the flexible cable sheath and the insulation layer are broken, and the insulation dressing of the flexible cable joint is improperly selected or loose and falls off. Factors such as leakage accidents of low-voltage power supply lines will occur, resulting in electric shocks, fires and other disasters. Contents of the in...

AI Technical Summary

Problems solved by technology

[0002] The high-voltage power grid is not easy for people to touch, but the low-voltage power grid covers a large area, has a lot of electrical equipment, and there are more opportunities for people to touch it. Due to the damp of the electrical lines, the overload of electricity during the peak period of power consumption, the insulation of the household wires and lead wires is aging or damaged. , The rubber insulated wire sheath, the flexible cable sheath and the insulation layer are broken, and the insulation dressing of the flexible cable joint is improperly selected or loose and falls off. Factors such as leakage accidents of low-voltage power supply lines will occur, resulting in electric shocks, fires and other disasters.

Images