Siprotec 7SS85 cost effective differential current protection relay

Product Description

The centralized busbar protection SIPROTEC 7SS85 is a selective, safe, and fast protection against busbar faults in medium voltage, high-voltage and very high voltage systems with the most various busbar configurations.

Busbar protection devices SIPROTEC 7SS85 are part of the modular SIPROTEC 5 series and their main function bases on the principle of differential protection.

Additional protection and control functions extend the scope of application to a comprehensive station protection.

The flexibility of the functions and the modular hardware structure allow an optimum adaptation of the 7SS85 to the most various system configurations and functional requirements.

Functionality 

• The centralized busbar protection SIPROTEC 7SS85 encompasses the following maximum quantity structure:
• 20 3-phase measuring points (current transformer)
• 4 3phase measuring points (voltage transformer)
• 26 bays (feeders, couplers, bus-section disconnections)
• 4 bus zones (busbar sections with measuring function)
• 4 couplers (with 1 or 2 current transformers)
• 2 auxiliary busbars (busbar sections without measuring function)
• Phase-selective measurement and Display
• Selective tripping of faulty busbar sections
• Optional additional decentralized binary in- and outputs via protection interface (PI) or IEC 61850 (GOOSE) provide new concepts for busbar protection