Research And Development Of Flameproof And Intrinsically Safe Circuit Combination Switch Six

With the development of underground working surface degree of automation and computer control technology, control of the coal mine equipment has a single starter to the development of the combined starter. Combined starter and load control center, is a multi-purpose starter is composed of a plurality of vacuum contactor and control part, is a kind of high reliability, intelligent centralized control of flameproof electrical equipment, the main equipment which can control include:shearer, scraper conveyor, conveyor, crusher, conveyor belt, boring machine and hydraulic pump station and other explosion-proof electrical equipment, which can realize the single speed motor sequence control, can realize the switch of double speed motor control. In addition combined starter and overcurrent protection, short-circuit protection, earth leakage, leakage protection, open phase blocking, phase failure protection function.Control function and protection function starter were realized by microcomputer, although there are a lot of computer control methods, but considering the complexity of underground working environment, the anti-interference ability of PLC as the main component of microcomputer protection.The research mainly includes the leakage detection circuit, phase detection circuit, overload protection, short circuit protection, phase lack protection, design function and man-machine interface control circuit.In total isolation switch before closing, to leakage detection and phase detection of each circuit, fault occurs, does not allow the circuit of intelligent AC contactor, the normal work when phase failure occurs leakage fault, to protect action on the loop, namely has the earth leakage leakage protection phase locking phase failure protection function.In addition to signal acquisition, various fault protection function and control function of the function design of the software part. In accordance with the coal industry, national standards, overload ratio reached8-10times, that is short circuited, protection action.The control functions, including any combination design of2-6loop and double speed motor two winding switching. Man-machine interface using industrial touch screen, the main setting for each loop state monitoring and combined starter mode. The function includes display, parameter setting and fault query function. As the coal mine special production environment, so the design of the system structure, the touch screen is placed close to the door position in the combined starter explosion proof shell, so that the operator can operate on the special window door and control key.