The SIPROTEC 7SS85 busbar protection is a selective, safe, and fast protection against busbar short circuits in medium-voltage systems, high-voltage systems, and systems for very high voltage. The proven, fast, and reliable algorithms from the SIPROTEC 7SS52 in conjunction with the flexible, scalable, open, and user-friendly SIPROTEC 5 platform set the new bar for the SIPROTEC 7SS85 busbar protection.

At a glance

• Can be used for both centralised and distributed busbar protection
• Busbar protection architecture options include centralised, distributed or hybrid (where process information can be connected directly as well as measured by bay devices)
• Phase-selective measurement and display
• Selective tripping of faulty bus zones
• Disconnector-independent check zone as additional tripping criterion 
• Shortest tripping times to ensure network stability and minimise damage to the system
  • Centralised busbar protection: 3 ms/7 ms (relay type HS/type F)
  • Distributed busbar protection: 8 ms/12 ms (relay type HS/type F)

Benefits

• Fast and secure – Proven and reliable algorithms since 1989
• Cyber Secure – Compliant with NERC CIP and BDEW white paper requirements
• Robust – Highest availability even under extreme environmental conditions
• Consistent – One platform, one device, one configuration tool
• User-friendly – Configuration by the user during the entire service life
• Clear – Fully graphical engineering and online plant visualisation with DIGSI 5
• Flexibility – Centralised, decentralised or combined (hybrid) architecture
• Universal – SIPROTEC 5 protection devices and merging units as a bay unit
• Powerful – Busbar protection device as centralised feeder protection
• Economical – Extension of power-system protection with busbar protection
• Interoperable – Compatible solution with merging units according to IEC 61850 Rev. 2.1 possible

Applications

• Can be used for both centralised and distributed busbar protection
• The selection of the device base functionalities (significant features) and the modular hardware structure allow optimum adaptation of the SIPROTEC 7SS85 to a large variety of system 
  configurations and functional requirements up to a complete station protection.