ABB TU810V1 After sales service is provided for the control card of the power supply device

Description

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Other types of starting for squirrel-cage motors are accomplished by reducing
the supply voltage of the motor: this leads to a reduction in the starting current
and of the motor torque, and an increase in the acceleration time.
Star-Delta starter
The most common reduced voltage starter is the Star-Delta starter (Y-∆), in
which:
– on starting, the stator windings are star-connected, thus achieving the
reduction of peak inrush current;
– once the normal speed of the motor is nearly reached, the switchover to delta
is carried out.
After the switchover, the current and the torque follow the progress of the curves
associated with normal service connections (delta).
As can be easily checked, starting the motor with star-connection gives a
voltage reduction of √3, and the current absorbed from the line is reduced by
1/3 compared with that absorbed with delta-connection.
The start-up torque, proportional to the square of the voltage, is reduced by
3 times, compared with the torque that the same motor would supply when
delta-connected.
This method is generally applied to motors with power from 15 to 355 kW, but
intended to start with a low initial resistant torque.