Class 2 (2nd Engineer) MET 📅 Dec 2023

Exam Question

The direct online 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 each of the following Problems:

(a) High starting current

(b) Low starting current (16)

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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