Main Transformer
General: 25 KV, 1-phase, AC Supply is taken from OHE catenary/ contact wire through pantograph, roof equipment and VCB (DJ). The same supply is fed to charge the “ parallel induction transformer” where it is stepped down to different operating voltage. .
The tank is filled with transformer oil:
• In order to increase the insulation strength and
• So that the arising heat loss can be dissipated through the circulating oil
The two parallel oil circuits with pumps and heat exchangers are provided
A spy glass is provided in each machine room to check the oil level of transformer oil.
There are 3 secondary winding:
a.Convertor secondary winding/Traction winding(4 nos.)
b.Aux. Convertor secondary windings.(1 no.)
c.Harmonic filter secondary winding.(1 no.)
