Siemens 7SR242 Reyrolle Transformer Protection Relay
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Product Description
Siemens 7SR242 Reyrolle TransformerProtection Relay
The 7SR242 is used as a protection, control andmonitoring relay for two winding transformers of all vector groups, primaryconfigurations/connections and earthing connections.The relay functionalityalso allows its application in auto-transformer and reactor protectionschemes. Relays are housed in size E8 or E10 cases. Integrated logic is providedto allow the optimal configuration of relay functionality with the relaysanalogue inputs and binary input/output circuits. Protection, control,instrumentation and metering functionality is accessible via data commschannel(s). A front USB port for local PC connection or rear electrical RS485port for remote connection are provided. Additional rear port options areavailable.
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
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