Class 2 (2nd Engineer) MET 📅 Apr 2018

Exam Question

The direct on line start of squirrel cage motor is used for most electrical drives on a.c powered ships. Describe with sketches as necessary one method of overcoming rach of the following problems.

(a) High starting current

(b) Low starting torque

Reference Answer

(a) Overcoming High Starting Current:
(i) Star-Delta Starting:
The stator windings have end connections brought out to a starter box with six terminals.
These are first connected in a star configuration for starting, which reduces the voltage and hence the current.

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