Flame-proof type zero-cross release switch for mines

Abstract

The invention provides a flame-proof type zero-cross release switch for mines to achieve the purposes that a major loop power supply is cut in an electric current crossing zero, when a three phase current electric device is stopped. The flame-proof type zero-cross release switch for the mines comprises a flame-proof shell, an operation mechanism, and an electric control part. The flame-proof shell comprises a flame-proof junction box and a flame-proof main box. An inlet wire amphenol connector, an outer wire amphenol connector and a control line amphenol connector are placed in the flame-proof junction box. The inlet wire amphenol connector is used for connecting a three phase power line. The lower end of the inlet wire amphenol connector enters the flame-proof main box. The outer wire amphenol connector is used for connecting a power line of a controlled device. The flame-proof main box is used for installing the operation mechanism and the electric control part. The operation mechanism is arranged on the flame-proof main box to be used for the electric control of the zero-cross release switch. The flame-proof type zero-cross release switch for the mines enables random outage operation of the electric device to be an alternating current stopping to work when the alternating current crosses zero.

Description

technical field [0001] The invention belongs to the field of electrical control, and in particular relates to a mine-used flameproof zero-crossing release switch for controlling the operation and shutdown of the motor to realize the disconnection of the three-phase AC motor of the equipment when the current of the three-phase AC grid crosses zero when the equipment needs to be stopped. Background technique [0002] At present, when the underground electrical equipment in the coal mine is shut down normally or due to failure, because the breaking capacity of the mine-used flameproof switch vacuum tube is stronger than that of the air contactor or air circuit breaker, it is often forcibly broken when the grid current does not cross zero, causing the motor inductance coil to be broken. The overvoltage generated on the circuit is far higher than that during normal operation, causing coil insulation damage or breakdown, and at the same time, the excessively high counter electromot...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a mining explosion-proof zero-crossing switch that can cut off the power supply of the main circuit when the current of the three-phase AC power equipment in the coal mine is shut down when the current crosses zero, so as to solve the shutdown problem in the prior art When the motor inductance coil produces an overvoltage much higher than its normal operation, the coil insulation is damaged or broken down, and the intelligent monitor (or protector) is damaged, resulting in the problem that the underground equipment of the coal mine cannot operate normally.

Images