Starting device for high-voltage motor, and control system

Abstract

The invention discloses a starting device for a high-voltage motor. A thermistor is connected in a main motor loop in a series manner, and the thermistor comprises a liquid tank. The interior of the liquid tank is provided with at least two placement units, and the interior of each placement unit is provided with ion electrolyte. Each placement unit is provided with a fixed conductive pole plate and a moving conductive pole plate, wherein the fixed conductive pole plates are disposed at the lower parts of the placement units, and the moving conductive pole plates are disposed on the fixed conductive pole plates and are connected with a current conduction mechanism through conductive poles. The device is advantageous in that the device is simple in structure; the thermistor consists of the liquid tank, the ion electrolyte, electrodes and the current conduction mechanism; the thermistor is connected in the motor stator loop in a series manner; a starting current passes through the thermistor when a motor is started, so the temperature of the thermistor gradually increases and the resistance of the thermistor gradually decreases, thereby enabling a motor end voltage to increase gradually, and achieving the stable starting of the motor; the device is small and stable in starting current, is low in bus voltage, and is high in power factor.

Description

technical field [0001] The invention relates to a starting device applied to a high-voltage motor, and in particular, to a control system. Background technique [0002] Most of the 6KV high-voltage motors for suction, delivery, discharge and grinding in thermal power plants are started directly, which cannot make full use of the generator power according to the requirements, and sometimes affects the operation safety of other boiler equipment during the start-up period. In the prior art, the starting current of the motor can be reduced by a small amount by adopting the reactor step-down starting method, but the original low power factor (0.15-0.2) at the time of starting the motor becomes even lower due to the reactor connected in series. In addition, the reactor step-down start has poor adaptability to the grid or machinery. For example, when the grid voltage is low, the output torque of the motor cannot overcome the gradually increasing resistance torque of the fan pump ma...

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