Over-current protection relay SIPROTEC 7SJ6 series

voltageearth-leakagesynchronization

The SIPROTEC 7SJ6 overcurrent protection relays have been designed specifically for protection of feeders, lines and motors 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 investment security. Features The relay provides control of the circuitbreaker, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages. The flexible communication interfaces are open for modern communication architectures with control systems. Hardware •4 current transformers •3/8/11 binary inputs •4/8/6 output relays •Text display or graphical display •Surface-mounting or flush-mounting housing Communication interfaces •System port – IEC 61850 – PROFINET – DNP3 TCP – IEC 60870-5-103 – PROFIBUS-DP – DNP 3.0 – MODBUS RTU •Service port – DIGSI 4, – Modem – Thermobox •Front port – DIGSI 4 •Time synchronization via IRIG B/DCF77 Functions Protection functions •Overcurrent protection (definite-time/inverse-time/user-def.) •Sensitive earth-fault detection •Intermittent earth-fault protection •High-impedance restricted earth fault •Inrush - Current detection •Motor protection – Undercurrent monitoring – Starting time supervision – Restart inhibit – Locked rotor – Load jam protection •Overload protection •Temperature monitoring