The 7SR242 is used as a protection, control and monitoring relay for two winding transformers of all vector groups, primary configurations/connections and earthing connections.
The relay functionality also allows its application in auto-transformer and reactor protection schemes.
Relays are housed in size E8 or E10 cases. Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analogue inputs and binary input/output circuits.
Protection, control, instrumentation and metering functionality is accessible via data comms channel(s). A front USB port for local PC connection or rear electrical RS485 port for remote connection is provided. Additional rear port options are available.
•Cold load settings
•Eight settings groups
•Password protection - 2 levels
•User programmable logic
•Circuit breaker trip counters
•Fault, event and waveform records
•Negative phase sequence overcurrent (46NPS)
•Thermal overload (49)
•Overcurrent (50, 51)
•Earth fault (50G, 50N, 51G, 51N)
•Neutral voltage displacement (59N)
•High impedance REF (64H)
•Biased differential (87BD)
•High-set differential (87HS)