Siemens Siprotec 4 SIPROTEC 7SA522 Protection Relay
The SIPROTEC 7SA522 relay provides comprehensive distance protection and all functions necessary for power line protection. Designed for fast and selective fault clearance on transmission and sub-transmission lines, it supports single- and three-pole tripping for overhead lines or cables, with or without series capacitor compensation. The device supports solid, resistance, resonant (Peterson coil), or isolated neutral grounding systems
Technical Specifications
Protection Functions:
Distance protection with 6 measuring systems (21/21N)
High resistance ground-fault protection (50N, 51N, 67N)
Tele (pilot) protection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase overcurrent protection (50/51)
STUB bus overcurrent (50STUB)
Switch-onto-fault (50HS)
Over/undervoltage (59/27)
Over/underfrequency (81O/U)
Auto-reclosure (79)
Synchro-check (25)
Breaker failure protection (50BF)
Control Functions:
Command control for circuit breakers and isolators
Monitoring Functions:
Trip circuit supervision (74TC)
Relay self-supervision
Measured-value supervision
Event/fault logging
Oscillographic fault recording
Switching statistics
Front Design:
Numeric keypad for easy local operation
Alarm LEDs
PC front port for configuration
Function keys
Communication Interfaces:
Front interface for PC connection
System interface: IEC 61850 / IEC 60870-5-103 / PROFIBUS-FMS/DP / DNP 3.0
2 serial data interfaces for pilot protection
Rear modem/service interface
Time sync via IRIG-B, DCF77, or system interface
Hardware:
Binary inputs: 8 / 16 / 24
Output relays: 16 / 24 / 32
Optional high-speed trip outputs: 5
Distance protection with 6 measuring systems (21/21N)
High resistance ground-fault protection (50N, 51N, 67N)
Tele (pilot) protection (85)
Fault locator (FL)
Power swing detection/tripping (68/68T)
Phase overcurrent protection (50/51)
STUB bus overcurrent (50STUB)
Switch-onto-fault (50HS)
Over/undervoltage (59/27)
Over/underfrequency (81O/U)
Auto-reclosure (79)
Synchro-check (25)
Breaker failure protection (50BF)
Control Functions:
Command control for circuit breakers and isolators
Monitoring Functions:
Trip circuit supervision (74TC)
Relay self-supervision
Measured-value supervision
Event/fault logging
Oscillographic fault recording
Switching statistics
Front Design:
Numeric keypad for easy local operation
Alarm LEDs
PC front port for configuration
Function keys
Communication Interfaces:
Front interface for PC connection
System interface: IEC 61850 / IEC 60870-5-103 / PROFIBUS-FMS/DP / DNP 3.0
2 serial data interfaces for pilot protection
Rear modem/service interface
Time sync via IRIG-B, DCF77, or system interface
Hardware:
Binary inputs: 8 / 16 / 24
Output relays: 16 / 24 / 32
Optional high-speed trip outputs: 5
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