7SS52 Distributed Bus Bar Diffrential Protection Relay
The SIPROTEC 7SS52 numerical protection is a selective, reliable and fast protection for busbar faults and breaker failure in medium, high and extra-high voltage substations with various possible busbar configurations.The protection is suitable for all switchgear types with iron-core or linearized current transformers. The short tripping time is especially advantageous for applications with high fault levels or where fast fault clearance is required for power system stability.The modular hardware allows the protection to be optimally matched to the busbar configuration. The decentralized arrangement allows the cabling costs in the substation to be drastically reduced. The 7SS52 busbar protection caters for single, double or triple busbar systems with or without and quadruple busbar systems without transfer bus with up to: 48 bays, 16 bus couplers, and 24 sectionalizing disconnectors and 12 busbar sections.
Busbar differential protection
Selective zone tripping
Very short tripping time (<15 ms)
Extreme stability against external fault, short saturation-free time (≥2 ms)
Phase-segregated measuring systems
Integrated check zone
48 bays can be configured
12 busbar sections can be protected
Bay-selective intertripping
BREAKER FAILURE PROTECTION FUNCTIONS
Breaker failure protection (single-phase with/without current)
5 operation modes, selectable per bay
Separate parameterization possible for busbar and line faults
Independently settable delay times for all operation modes
2-stage operation bay trip repeat/trip busbar
Intertrip facility (via teleprotection interface)
“Low-current†mode using the circuitbreaker auxiliary contacts
ADDITIONAL PROTECTION FUNCTIONS
End-fault protection with intertrip or bus zone trip
Backup overcurrent protection per bay unit (definite-time or inverse-time)
Independent breaker failure protection per bay unit
FEATURES
Distributed or centralized installation
Easy expansion capability
Integrated commissioning aids
Centralized user-friendly configuration/parameterization with DIGSI
Universal hardware
COMMUNICATION INTERFACES
FO interface
– IEC 60870-5-103 protocol
Electrical interface
– IEC 61850 protocol with EN 100 module (firmware V4.6)