Microcomputer control automatic pressure regulating device

Abstract

Disclosed is an automatic pressure adjusting apparatus in microcomputer, which comprises three-phase booster transformer and control circuit. The three-phase booster transformer secondary winding is equipped with a plurality of taps. Every phase of the secondary winding has a transition resistance and its taps are separately connected with the two ends of transition resistance via the two contact points. As exploiting transition resistance during the voltage adjusting process, damages of windings and contact points are avoided.

Description

technical field [0001] The invention relates to the power supply technology of coal mines, in particular to a microcomputer-controlled automatic voltage regulating device. Background technique [0002] At present, the low-voltage underground power supply of coal mines in most places in China, due to the long line and large voltage loss, makes the electromechanical equipment difficult to start, or cannot operate normally, and even burns out the motor frequently. The secondary winding is provided with several taps, and each tap is connected to the load through the switch contact, and the closing of each switch contact is automatically controlled by the microcomputer. This patent solves the problem of automatic voltage regulation, but there are still major defects in this patent, such as the manual attached figure 1 Shown, contactor contact switch K 1 K 2 K 3 K 4 K 5 Any two contacts cannot be closed at the same time, such as K 1 with K 2 are closed at K 1 K 2 A short...

AI Technical Summary

Problems solved by technology

[0002] At present, the low-voltage underground power supply of coal mines in most places in China, due to the long line and large voltage loss, makes the electromechanical equipment difficult to start, or cannot operate normally, and even burns out the motor frequently. The secondary winding is provided with several taps, and each tap is connected to the load through the switch contact, and the closing of each switch contact is automatically controlled by the microcomputer. This patent solves the problem of automatic voltage regulation, but there are still major defects in this patent, such as the manual attached figure 1 Shown, contactor contact switch K 1 K 2 K 3 K 4 K 5 Any two contacts cannot be closed at the same time, such as K 1 with K 2 are closed at K 1 K 2 A short circuit is formed with the winding, which will generate a large short circuit current and burn out the winding and contact K 1 K 2 , so when adjusting the voltage, you can only open the closed contact first, and then close the other contact, that is, you can only cut off the power and adjust the voltage. Machines, belt conveyors, water pumps, winches, coal shearers, etc. will stop working due to power outages, and then workers often have to walk a long distance to start equipment one by one, which not only has a great impact on underground production, but also There are also many potential safety hazards, causing the patent to almost lose its practical value

Images