Earth Fault Relay Connection Diagram. The secondary terminal of the current transformer is connected in parallel with the relay. 61 62 spaj 140 c 63 25 26 27.
Since the fault current is low a typical ground overcurrent relay is inefficient for detecting ground faults in an ungrounded system. Overview technical specification connection diagrams applications earth fault ground fault monitoring of 3 phase systems manual reset input 1a or 5a through cbct adjustable earth fault trip setting adjustable trip delay 2 co relay output system supply system 24 30 vdc 100 120 220 240 380 440 v ac 20 auxillary. Ungrounded system and sequence diagram.
The secondary terminal of the current transformer is connected in parallel with the relay.
Recent advances in numerical relay technology have all but eliminated these issues making the implementation of ref relatively easy ensuring no nuisance tripping and simplifying commissioning. 4 connections modified 2003 09 fig. Electrical relays alstom numerical electric idmt relay schematic wiring restricted earth fault relay spaj 115 c mater trip relay 86 working function earth fault relay spaj 140 c backup protection of transformer over cur and earth fault electrical4ubackup protection of transformer over cur and earth fault electrical4uwiring diagram of earth fault relay full hd version. Overview technical specification connection diagrams applications earth fault ground fault monitoring of 3 phase systems manual reset input 1a or 5a through cbct adjustable earth fault trip setting adjustable trip delay 2 co relay output system supply system 24 30 vdc 100 120 220 240 380 440 v ac 20 auxillary.
