Voltage protection relay SIPROTEC 7SS52

switchgearDIN railpanel-mount

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. Features 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 SIPROTEC 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. Communication interfaces •FO interface – IEC 60870-5-103 •Electrical interface – IEC 61850 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