Siemens Reyrolle 7SR110 Non-Directional Overcurrent Protection Relay
Description
7SR110 Relay
The Siemens 7SR110 relay provides overcurrent and earth fault protection. These relays are typically applied to provide the main protection on feeders and interconnectors and the backup protection on items of plant such as transformers. On distribution system circuits overcurrent and earth fault protection are often the only protection installed. The Siemens relay functionality allows highly flexible settings for current and time grading making it compatible with all types of overcurrent protection. Protection, 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.
Features of Siemens 7SR110 Relay:-
- Cold load settings
- Four settings groups
- Password protection – 2 levels
- User-programmable logic
- Self-monitoring
- Circuit breaker trip counter and timer
- Fault, event, and waveform records
Functions:-
Protection functions
- Undercurrent (37)
- Broken conductor (46BC)
- Negative phase sequence overcurrent (46NPS)
- Thermal overload (49)
- Overcurrent (50, 51)
- Earth fault (50G, 50N, 50SEF, 51G, 51N, 51SEF)
- High impedance REF (64H)
Supervision functions
- CT supervision (60CTS)
- Trip & close circuit supervision (74T/CCS)
- Inrush detector (81HBL2)
- Circuit breaker Fail (50BF)
Control functions
- Auto reclose (79)
Monitoring functions
- Primary/secondary current phases and earth
- Historical demand record
- Positive phase sequence (PPS) current
- Negative phase sequence (NPS) current
Protection, instrumentation, and metering functionality are accessible via data comms channel(s). A front USB port for local PC connection or rear electrical RS485 port for remote connection is provided. The relays are available in single and four-pole variants housed in E4 cases with the IEC 61850 protocol option housed in an E6 case. Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analogue inputs and binary input/output circuits.
