33KV HT RELAY
HT RELAYS : The below Relay are Combination of Two over current(O/C) One Earth fault (E/F) relays in a Single unit . ELECTROMAGNETIC INDUCTION DISC TYPE RELAY Types of HT relays : 1 . OVER CURRENT RELAY 2. SHORT CIRCUIT RELAY 3. EARTH FAULT RELAY OVERCURRENT RELAY : It is induction Disc type Electromagnetic Relay with IDMT characteristics . Different characteristics of O/C RELAY are : Instantaneous Definite time IDMT Very inverse Extreme inverse Overcurrent relay (inverse ) type set at 0.75 Amps Relay tripping time set at 0.1 sec. Earth fault Relay set at 2.0 AMPS Relay tripping time set at 0.1 sec.