Distance protection relay SIPROTEC 7SA series

synchronizationthree-phasetransmission line

The SIPROTEC 7SA522and SIPROTEC 7SA6 distance protection have been designed particularly for the protection of lines in medium-voltage and high-voltage systems. With the high-performance DIGSI 4 engineering tool, the SIPROTEC 4 devices offer user friendly system solutions for protection, automation and monitoring with high field experience and security. Features The SIPROTEC 7SA522 incorporates several protective functions usually required for transmission line protection. •High-speed tripping time •Suitable for cables and overhead lines with or without series capacitor compensation •Self-setting power swing detection for power swing frequencies up to 7 Hz Digital relay-to-relay communication for two and three terminal topologies •Adaptive auto-reclosure (ADT) Hardware •Binary inputs: 8 to 24 •Binary outputs : 16 to 44 •High-speed trip outputs: 5/10 (optional) •Text display •Surface-mounting or flush-mounting housing Communication interfaces •System port – IEC 61850 – IEC 60870-5-103 – PROFIBUS DP – DNP 3 •Service port – DIGSI 4 – Modem •2 serial protection data interface for teleprotection •Front port – DIGSI 4 •Time synchronization via IRIG B, DCF 77 or system interface Functions Protection functions •Non-switched distance protection with 6 measuring systems (21/21N) •High resistance ground (earth)-fault protection for single and three-phase tripping (50N, 51N, 67N) •Tele (pilot) protection (85) •Fault locator (FL) •Power swing detection / tripping (68/68T) •Phase-overcurrent protection (50/51) •STUB bus overcurrent protection (50STUB) •Switch-onto-fault protection (50HS) •Over/undervoltage protection (59/27)