ACT (RS) ABB Loco (English) (42. PROTECTIVE SCHEME)

10-01-2021

PROTECTION SCHEME  Protective measures by control electronics:  Initiation of protective measure in dangerous situation is controlled by Control Electronics. MCE monitors a range of values such as voltage, current, temperature, pressure and other signals. Catenary voltage out of range  When catenary voltage drop down below 17.0 KV and raise above 30 KV VCB will open automatically. Temperature protection- When temp of Transformer exceeds beyond 84 degree C, for more than 10 sec, VCB will trip. Primary Over Current Protection (QLM) Reason for over current. 1. Disturbance in measurement of primary current. 2. Fault in converter. 3. Short circuit in Xmer

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