Coal mine explosion-proof switch device for distant active power disconnection and power transmission and method

Abstract

The present invention relates to a branch-feed explosion-proof control switch which can perform active power disconnection, power transmission and feed intrinsically safe pilot locking in a coal mine underground power supply system, especially a coal mine explosion-proof switch device for distant active power disconnection and power transmission and a method. According to the coal mine explosion-proof switch device for the distant active power disconnection and power transmission and the method of the invention, an explosion-proof feed switch, signal transmission, intrinsically safe pilot locking, an explosion-proof control switch, wiring cavity state locking and detection are designed and improved; switch-on and switch-off operation of a disconnecting switch in the explosion-proof control switch can cause changes in the state of an auxiliary contact of the disconnecting switch and current in a main loop of the explosion-proof feed switch; and whether to perform the power disconnection and power transmission is judged through logical analysis. With the coal mine explosion-proof switch device for the distant active power disconnection and power transmission and the method of the invention adopted, at the explosion-proof control switch, an operator can perform distant power disconnection through operating the handle of the disconnecting switch, and a power transmission application button can locally transmit instructions, and the explosion-proof feed switch can be distantly operated such that a power source can be transmitted; and the locking of the power transmission of the explosion-proof control switch which can be switched off only through application can be realized; situations in which dynamic electricity still exists inside the shell of the explosion-proof control switch and a power source wiring cavity when a door or a cover is opened underground can be eliminated, and therefore, the safety of underground maintenance of the explosion-proof control switch can be improved.

Description

1. Technical field [0001] The invention relates to a low-voltage explosion-proof switch (including an explosion-proof electrical switch with an isolating switch or an isolating reversing switch, the same below) used in a coal mine underground power supply system and the power-off and power-transmitting modes of an explosion-proof feed switch connected to its branches. In particular, it relates to the active power-off and power transmission of the explosion-proof control switch and the pilot locking of the explosion-proof feed switch in the case where a primary circuit explosion-proof feed switch is connected to an explosion-proof control switch (including an explosion-proof electromagnetic starter, the same below). 2. Background technology [0002] 1. When the low-voltage explosion-proof feeder switch in the coal mine underground power supply system is used as the main switch, several explosion-proof control switches are connected to the primary circuit feeder line, and when ...

AI Technical Summary

Problems solved by technology

[0003] The defect of the above regulations is: the explosion-proof shell cover cannot be opened when the above-mentioned feed power is connected, and the power supply cannot be connected after the explosion-proof shell cover is opened, which means that there is no power on the load side of the isolation switch inside the explosion-proof control switch, and the power supply side still exists. Powered voltage

[0005] The disadvantages of these technologies are: (1) they solve the problem that the operator opens the power supply or the wiring chamber cover in violation of regulations, and do not solve the problem that the explosion-proof housing still has power electricity when the explosion-proof control switch door or cover is opened in normal operation. question

(2) The switch and pressure plate added to the power wiring cavity of the explosion-proof control switch destroy the original design structure and appearance of the explosion-proof control switch, which does not meet the safety management principles of explosion-proof electrical

(3) Although some patented technologies have the function of selective power-off, it still requires personnel to send power to the feed switch when power is transmitted

(4) This idea is to transfer the responsibility of the violating operator to the equipment manufacturer, and does not improve the safety performance of the equipment

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