Siemens SIPROTEC 7SS52 Busbar Protection
The Siemens SIPROTEC 7SS52 is a numerical protection relay designed for selective, reliable, and ultra-fast busbar protection in medium, high, and extra-high voltage substations. It provides busbar and breaker failure protection for a wide range of configurations — single, double, triple, or quadruple busbar systems. The system ensures extreme stability, short tripping times (<15 ms), and flexible modular hardware for scalable installations. Ideal for power utilities and industrial substations requiring fast fault clearance and operational reliability.
Technical specifications
Busbar Protection Functions:
Busbar differential protection
Selective zone tripping
Ultra-fast tripping time (<15 ms)
High stability against external faults (saturation-free ≤2 ms)
Phase-segregated measurement
Integrated check zone
Up to 48 bays and 12 busbar sections configurable
Bay-selective intertripping
Breaker Failure Protection Functions:
Single-phase breaker failure protection (with/without current)
5 operation modes per bay
Separate parameterization for busbar/line faults
Two-stage operation with repeat/trip options
Intertrip via teleprotection
Low-current mode using breaker auxiliary contacts
Additional Functions:
End-fault protection with intertrip or bus zone trip
Backup overcurrent protection (definite or inverse time) per bay
Independent breaker failure protection per bay
Features:
Centralized or distributed installation
Modular and easily expandable
Integrated commissioning aids
User-friendly configuration via DIGSI 4
Universal hardware design
Communication Interfaces:
Fiber Optic Interface: IEC 60870-5-103
Electrical Interface: IEC 61850 (EN100 module, firmware V4.6)
Busbar differential protection
Selective zone tripping
Ultra-fast tripping time (<15 ms)
High stability against external faults (saturation-free ≤2 ms)
Phase-segregated measurement
Integrated check zone
Up to 48 bays and 12 busbar sections configurable
Bay-selective intertripping
Breaker Failure Protection Functions:
Single-phase breaker failure protection (with/without current)
5 operation modes per bay
Separate parameterization for busbar/line faults
Two-stage operation with repeat/trip options
Intertrip via teleprotection
Low-current mode using breaker auxiliary contacts
Additional Functions:
End-fault protection with intertrip or bus zone trip
Backup overcurrent protection (definite or inverse time) per bay
Independent breaker failure protection per bay
Features:
Centralized or distributed installation
Modular and easily expandable
Integrated commissioning aids
User-friendly configuration via DIGSI 4
Universal hardware design
Communication Interfaces:
Fiber Optic Interface: IEC 60870-5-103
Electrical Interface: IEC 61850 (EN100 module, firmware V4.6)
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