Siemens SIPROTEC 7SJ66 Protection Relay – 4xI 4xV, 8-line or graphical display, directional

Inputs: 4xI and 4xV ، Display: 8-line text or graphical LCD ، Protection Functions: ، Overcurrent protection (non-directional and directional) ، Motor protection and monitoring ، Earth-fault protection ، Thermal overload and undercurrent protection ، Voltage and frequency protection ، Circuit-breaker failure protection ، Negative-sequence protection ، Control & Logic: ، Control of CBs and isolators via keyboard, binary inputs, DIGSI 4, or SCADA ، Graphical visualization of switch positions ، User-defined logic using CFC (interlocking, sequences, etc.) ، Monitoring Functions: ، Operational measured values (V, I, f) ، Energy metering (Wp, Wq) ، Circuit-breaker wear monitoring ، Trip circuit supervision ، Fuse failure monitor ، 8 oscillographic fault records ، Motor statistics ، Communication Interfaces: ، IEC 61850, IEC 60870-5-103, Modbus RTU, DNP3 ، Electrical & optical ports, RSTP Ethernet redundancy ، Front USB & service interfaces for DIGSI 4 ، Time sync: IRIG B, DCF77 ، Languages: English, Spanish, Russian, Polish, Turkish ، Proven SIPROTEC 4 technology for protection, control, and automation