Overload relay PCS-9691

over-currentunder-currentover-frequency

The PCS-9691 relay is a protection, control and monitoring unit for various applications (such as overhead line, underground cable, transformer and capacitor etc.) on solidly grounded, impedance grounded, Peterson coil grounded and ungrounded system. The PCS-9691 features a high performance functional library, programmable logic, configurable I/O and integrated frequency-tracking. The PCS-9691 is designed based on advanced multiprocessor platform, fully complying with IEC 61850 station bus, supporting IEC 61850-8-1 MMS. • Six-stage phase overcurrent protection(50/51P) • Four-stage directional phase overcurrent protection (67P) • Six-stage neutral/ground overcurrent protection(50/51N, 50/51G) • Four-stage directional neutral/ground overcurrent protection(67N/G) • Two-stage negative-sequence overcurrent protection (46) • Thermal overload protection for alarm/trip (49) • Broken conduct detection (46BC) • Breaker failure element (50BF) • Dead zone protection (50DZ) • Undercurrent protection (37) • Restricted earth fault protection (64REF) • Two-stage phase-ground or phase-phase undervoltage protection (27) • Two-stage phase-ground or phase-phase overvoltage protection (59) • Two-stage ground overvoltage protection (59G) • One-stage negative sequence overvoltage protection (47) • Four-stage under-frequency protection (81U) • Over-frequency protection (81O) • Frequency rate-of-change protection (81R) • Directional power protection (32) • Four-shot three-pole auto-reclosing (79) • Synchronism check for manual closing and auto- reclosing (25) • Switch onto fault logic (SOTF) • Cold load pickup logic (CLP) • Mechanical protection (MR) • Fault location (FL)