Siemens 7SR242 Reyrolle Transformer Protection Relay
The Siemens 7SR242 is a transformer protection relay for two-winding transformers of all vector groups, primary configurations, and earthing types. It can also be applied for auto-transformer and reactor protection schemes. Housed in E8 or E10 cases, it provides integrated programmable logic, analog and binary inputs/outputs, USB and RS485 ports for local or remote connection, and additional port options.
Technical Specifications
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: Circuit Breaker Fail (50BF), Trip Circuit Supervision (74TC), Inrush Detector (81HBL2), Over-fluxing Detector (81HBL5)
Monitoring: Primary/Secondary current phases & earth direction, relay operate/restraint currents, PPS/NPS/ZPS currents, thermal status, single-phase voltages, frequency, fluxing, historical demand records
Cold load settings, eight settings groups, password protection (2 levels), user-programmable logic, self-monitoring, circuit breaker trip counters, fault/event/waveform records
Data communication channels for protection, control, instrumentation, and metering
Supervision: Circuit Breaker Fail (50BF), Trip Circuit Supervision (74TC), Inrush Detector (81HBL2), Over-fluxing Detector (81HBL5)
Monitoring: Primary/Secondary current phases & earth direction, relay operate/restraint currents, PPS/NPS/ZPS currents, thermal status, single-phase voltages, frequency, fluxing, historical demand records
Cold load settings, eight settings groups, password protection (2 levels), user-programmable logic, self-monitoring, circuit breaker trip counters, fault/event/waveform records
Data communication channels for protection, control, instrumentation, and metering
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