Page 233 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

23 Insert right coil side of first coil, continued by other coils
24 Repeat previous 2 steps till completion of insertion of all coils
25 Tie overhang with cotton tape and press carefully near to the core for preventing obstruction to end cover and
use nylon hammer to shape coils.
26 Insert slot wedges to tightly pack the coil
27 Connect group connections of each phase, solder and sleeve them.

28 Tie the joints to overhang and make phase connections
29 Measure the resistance of the winding
30 Test the insulation resistance between windings, windings and body
31 Varnish the windings

32 Run the motor, measure currents and asses performance
For the double layer winding, insert left coil-sides of coils till the winding pitch.
Right side of first coil is to be inserted above the left side coil of next pole as per winding diagram.
Single layer winding example :
star connected, three phase , 50Hz, 1450rpm, squirrel cage induction motor having 24 slots

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CITS : Power - Electrician & Wireman - Exercise 91