Siemens Siprotec 4 SIPROTEC 7SA522 Distance Relay – 4xI 4xV, text display, MHO, 1-/3-pole tripping
The SIPROTEC 7SA522 Distance Relay is an advanced protection device providing accurate, fast, and reliable distance protection for industrial and utility power systems. With 4xI and 4xV inputs and a text display, it ensures precise monitoring, fault detection, and flexible tripping configurations (1-/3-pole). Designed for high-speed performance and seamless SCADA integration, it is ideal for substations, power plants, and industrial facilities
Technical Specifications
4 current inputs and 4 voltage inputs (4xI, 4xV)
Text display for easy configuration and operation
MHO characteristic for precise fault detection
1-/3-pole tripping options
Protection Functions:
Distance protection (21/21N)
Ground fault protection (50N, 51N, 67N)
Teleprotection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase-overcurrent (50/51), STUB bus overcurrent (50STUB), switch-onto-fault (50HS)
Over/undervoltage (59/27), frequency protection (81O/U)
Auto-reclosure (79), synchro-check (25), breaker failure (50BF)
Control & Monitoring:
Control of CBs and isolators
Trip circuit supervision (74TC)
Event and fault logging
Oscillographic recording and switching statistics
Communication:
IEC 61850, IEC 60870-5-103, MODBUS, PROFIBUS
DIGSI 4 software interface
Time synchronization via IRIG-B/DCF77
Reliable, fast, and SCADA-ready for modern grid protection
Text display for easy configuration and operation
MHO characteristic for precise fault detection
1-/3-pole tripping options
Protection Functions:
Distance protection (21/21N)
Ground fault protection (50N, 51N, 67N)
Teleprotection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase-overcurrent (50/51), STUB bus overcurrent (50STUB), switch-onto-fault (50HS)
Over/undervoltage (59/27), frequency protection (81O/U)
Auto-reclosure (79), synchro-check (25), breaker failure (50BF)
Control & Monitoring:
Control of CBs and isolators
Trip circuit supervision (74TC)
Event and fault logging
Oscillographic recording and switching statistics
Communication:
IEC 61850, IEC 60870-5-103, MODBUS, PROFIBUS
DIGSI 4 software interface
Time synchronization via IRIG-B/DCF77
Reliable, fast, and SCADA-ready for modern grid protection
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