Page 208 - CITS - Electrician - Trade Practical
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ELECTRICIAN - CITS
If a metal knife is used to remove the tight and sticky stampings, care should be taken not to damage
the stampings.While stripping the core see that the stampings are taken out straight without bends.
8 Remove all the stampings and record the following in Table 2.
Table 2
Core details
Type of core ......................................................
No.of.stampings of shape...............No..............
No. of . stamping of shape..............No..............
9 Wipe the bobbin and winding with a cloth.
10 Record the dimensions of the coil in Table 3 with and without insulation and prepare a template to check the
winding’s height and length.
Table 3
Size of the coil
Description With insulation Without insulation Remarks
Coil height ............cm ............cm
Coil height ............cm ............cm
11 Strip off the winding carefully. During the stripping process record all the particulars in Table 4.
Table 4
Winding details
Total No. of winding/turns .....................
No. of layers ...................................
No. of turns/layer Min .....................
Layer insulation Type ...............Thickness..........mm.
With Insulation Without Insulation Wt.of the coil
Primary winding
1st Tapping, No. of turns.............diameter of wire ............mm. ...........mm .......g
2nd Tapping, No. of turns.............diameter of wire ............mm. ...........mm .......g
3rd Tapping, No. of turns.............diameter of wire ............mm. ...........mm .......g
Secondary winding
Winding 1, No. of turns................diameter of wire ............mm. ...........mm .......g
Winding 2, No. of turns................diameter of wire ............mm. ...........mm .......g
Winding 3, No. of turns................diameter of wire ............mm. ...........mm .......g
Coil insulation - type ..........thickness........mm.
Connecting lead............size
12 Draw the schematic diagram of the primary and secondary sides of the transformer from the above findings in
your record.
13 Clean the bobbin, write down the bobbin particulars in Table 5 for your guidance.
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CITS : Power - Electrician & Wireman - Exercise 86
