TRACTION POWER
Potential transformer-.The primary voltage transformer is situated on the converter roof hatch and attached to the pantograph via the roofline. The primary voltage transformer reduces the catenary voltage, approximately 25 KV, to 200 volts AC. A resistor is placed across the primary voltage TFP to provide a reference load. The output signal is used in three ways;
1)Main converter electronics - 4 volt AC
3)Minimum voltage relay.86
When panto is raised this potential transformer fed to U meter shows the OHE supply in drivers cab.As such we know the availability of OHE supply before closing DJ and also idea of rising of panto. However our responsibility of seeing panto is not finished, we have to check the condition of panto physically
