Main Compressor

• Make:- Knorr Bremse
• Failures:- Oil Leakage and Coupler Slack.
• Failure Mode:- Metal Bellow glued to motor side hub got disengaged. another reason cited by Knorr Bremse was milky oil due to low duty cycle.
• Oil change recommended after 20-30 hrs of commissioning.

Pantograph

Shunk

• Obliqueness on welded cover on air bellows results in failure.
• Flexible shunt burning cases have been observed.
• Weight:-

Stone India

Transformer

Some modifications done:-

• Insertion resistance.
• Oil level sensor.
• Temperature sensor PT100.

Some failures:-

• HT Bushing Plate
• Blower

Central Pivot

Material:- MAFR, Single forged shaft.
Reduction in Forging:- 3:1 in normalised condition.
Mechanical Properties :- T/S 490 Mpa, Y/S 270 MPa, 21% Elongation, Hardness 140 MIN BHN.
Microstructure , and Magnetic Particle Test is also specified from NABL accredited Govt Appd. Lab.