What occasions need explosion-proof and intrinsically safe high-voltage vacuum AC soft starters

What occasions need explosion-proof and intrinsically safe high-voltage vacuum AC soft starters


This device is suitable for heavy loads of three-phase AC high-voltage motors with rated voltage of 10(6)kV, rated frequency of 50Hz, and rated current up to 400A in the underground coal mine and its surrounding medium containing mixed gases such as methane and coal dust. soft start. It can meet the control requirements of soft start and soft stop of different load objects such as pumps, fans, belt conveyors, scraper conveyors, air compressors, condensers, centrifuges, chain drives, screw feeders, elevators, etc. . Connected with KJ series coal mine underground power grid monitoring system, it can realize remote monitoring and control of switchgear, and realize modern management such as unattended operation.
Mining explosion-proof switch soft starter (soft starter) is a novel motor control device that integrates motor soft start, soft stop, light load energy saving and various protection functions. The soft starter uses a three-phase parallel thyristor as a voltage regulator, which is connected between the power supply and the motor stator. Such a circuit is like a three-phase fully-controlled bridge rectifier circuit. When the soft starter is used to start the motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully turned on, and the motor works on the mechanical characteristics of the rated voltage to achieve smooth starting, reduce starting current, and avoid starting overcurrent tripping. When the motor reaches the rated number of revolutions, the starting process is over, and the soft starter automatically replaces the thyristor that has completed the task with a bypass contactor to provide the rated voltage for the normal operation of the motor to reduce the heat loss of the thyristor and prolong the service life of the soft starter. , improve its work efficiency, and make the power grid avoid harmonic pollution. The soft starter also provides a soft stop function. The soft stop is the opposite of the soft start process. The voltage gradually decreases and the number of revolutions gradually drops to zero to avoid the torque shock caused by the free stop.