What is reduced voltage starting? What are the common methods of reduced voltage start?

Reduced-voltage starting refers to the motor starting current is approximately proportional to the voltage of the stator, so the stator voltage should be reduced to limit the starting current, that is, the reduced-voltage starting is also known as reduced-voltage starting. The role is to reduce the motor starting current.

Common reduced voltage starting methods:

Rotor series resistance reduced voltage start, reactance reduced voltage start, Y / Δ starting control line, delayed delta start, soft start and autotransformer reduced voltage start.

Expanded

Application:

In the actual use of the process, found that the need to start the motor from the start of the 11KW need, such as the fan, in the start of the 11KW current in the 7-9 times (100A) or so, according to the normal configuration of the thermal relay can not be started at all, (off the wind door is also useless). Thermal relay with a large and can not play the role of protecting the motor, it is recommended to use reduced voltage start. In some of the starting load is small on the motor, because the motor to reach a constant speed time is short, the start of the current impact of the impact is small, so in the 3KW or so of the motor, the choice of 1.5 times the rated current of the circuit breaker to start directly.

Baidu Encyclopedia - Reduced Voltage Starting