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Question:

How many kW or more AC Motors should be started with the starter?

How many kW or more AC Motors should be started with the starter?

Answer:

In fact, the problem needs to be taken into account in 4 main elements:1, when the motor starts, the voltage on the power distribution bus at all levels meet the normal use requirements of other equipment;2 、 mechanical energy can bear the impact torque when the motor is started at full pressure.3. The structure of the motor itself can withstand the impact of full pressure starting.4 、 does the motor start with special requirements?.
If only the General Motors (not including power plants, industrial production, motor) can refer to: civil, public and residential power grid direct power transformer power supply two, the former allows direct start for 11KW, which is 15KW
Starting of an electric motorArticle 2.3.1 when starting an electric motor, its terminal voltage shall be able to guarantee the starting torque required by the machine, and the voltage fluctuation caused in the distribution system shall not interfere with the work of other electrical equipment.Article 2.3.2 when starting an alternating current motor, the voltage on the distribution bus shall comply with the following requirements:First, in general circumstances, when the motor starts frequently, it should not be less than 90% of the rated voltage. When the motor is not started frequently, it should not be less than 85% of the rated voltage.Two, the distribution of buses on the lighting or other voltage fluctuations are more sensitive to the load, and when the motor is not frequently started, shall not be less than 80% of the rated voltage.Three, the distribution of buses on the other electrical equipment, can be guaranteed to start the motor torque conditions; for low voltage motors, but also to ensure that the contactor coil voltage is not less than the release voltage. Article 2.3.3 the choice of starting modes for cage motors and synchronous motors shall comply with the following provisions:When the following conditions are met, the motor shall be started with full pressure:1 when the motor starts, the voltage of the distribution bus meets the requirements of clause 2.3.2 of this specification:2 、 mechanical energy can bear the impact torque when the motor is started at full pressure;3. The manufacturer has no special rules for the starting mode of motors.Two, when not meet the full pressure starting conditions, the motor should buck start, or choose other appropriate starting method. Three, when the speed control requirements, the motor should start with speed regulation.

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