Siprotec 7SS52 Distributed Busbar differential protection Relay, siemens numerical relay

Product Description

Functions:

• Busbar protection functions
• 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)