7SR242 Transformer Protection Relay
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 schemesRelays 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 are provided. Additional rear port options are available.
PROTECTION FUNCTIONS
Over-fluxing (24)
Under/Over-voltage (27/59)
Undercurrent (37)
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)
SUPERVISION FUNCTIONS
Circuit Breaker Fail (50BF)
Trip Circuit Supervision (74TC)
Inrush Detector (81HBL2)
Over-fluxing Detector (81HBL5)
MONITORING FUNCTIONS
Primary/Secondary Currents Phases and Earth Direction
Relay operate and restraint currents
Positive Phase Sequence (PPS) Current
Negative Phase Sequence (NPS) Current
Zero Phase Sequence (ZPS) Current
Thermal status
Primary/Secondary Single Phase Voltage
Frequency and Fluxing
Historical Demand Record
FEATURES
Cold Load Settings
Eight Settings Groups
Password Protection - 2 levels
User Programmable Logic
Self Monitoring
Circuit Breaker Trip Counters
Fault, event and waveform records
Over-fluxing (24)
Under/Over-voltage (27/59)
Undercurrent (37)
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)
SUPERVISION FUNCTIONS
Circuit Breaker Fail (50BF)
Trip Circuit Supervision (74TC)
Inrush Detector (81HBL2)
Over-fluxing Detector (81HBL5)
MONITORING FUNCTIONS
Primary/Secondary Currents Phases and Earth Direction
Relay operate and restraint currents
Positive Phase Sequence (PPS) Current
Negative Phase Sequence (NPS) Current
Zero Phase Sequence (ZPS) Current
Thermal status
Primary/Secondary Single Phase Voltage
Frequency and Fluxing
Historical Demand Record
FEATURES
Cold Load Settings
Eight Settings Groups
Password Protection - 2 levels
User Programmable Logic
Self Monitoring
Circuit Breaker Trip Counters
Fault, event and waveform records