Siemens Siprotec 4 SIPROTEC 7SS52 Busbar Protection

The SIPROTEC 7SS52 Busbar Protection numerical protection provides selective, reliable, and fast protection for busbar faults and breaker failure in medium, high, and extra-high voltage substations. Additionally, it supports various possible busbar configurations. Therefore, it ensures dependable protection performance in complex substation environments.

Moreover, the protection is suitable for all switchgear types with iron-core or linearized current transformers. As a result, utilities can apply it across a wide range of substation designs. Furthermore, the short tripping time is especially advantageous for applications with high fault levels. Consequently, it enables fast fault clearance, which is critical for maintaining power system stability.

In addition, the modular hardware allows the protection system to be optimally matched to the specific busbar configuration. Similarly, the decentralized arrangement helps reduce cabling requirements within the substation. Thus, overall installation and infrastructure costs can be drastically reduced.

Finally, the SIPROTEC 7SS52 busbar protection supports single, double, or triple busbar systems. Additionally, it can also handle quadruple busbar systems without a transfer bus. Moreover, the system can manage complex configurations with up to 48 bays, 16 bus couplers, 24 sectionalizing disconnectors, and 12 busbar sections. Therefore, it becomes a powerful and flexible protection solution for modern substations.

SIPROTEC 7SS52 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

7SS52 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

SIPROTEC 7SS52 BUSBAR PROTECTION 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)

SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. The homogenous system platform, the unique DIGSI 4 engineering program, and extensive experience of more than a million successfully operating devices in the field worldwide – thanks to these unique advantages, SIPROTEC 4 enjoys top recognition among users worldwide. SIPROTEC 4 is the industry standard for digital protection technology today in all fields of application.