SIPROTEC Compact 7SJ80 Multifunction Protection Relay MiCOM P127 New Cost effective solution for MV Feeder SEL- 751A Feeder Protection Relay
SIPROTEC Compact 7SJ80
Multifunction Protection Relay
Description
Siemens SIP · 2008
5 Overcurrent Protection / 7SJ80
5
5/55
Protection functions
• Time-overcurrent protection
(50, 50N, 51, 51N)
• Directional time-overcurrent protection
(67, 67N)
• Sensitive dir./non-dir. ground-fault
detection (67Ns, 50Ns)
• Displacement voltage (64)
• High-impedance restricted ground fault
(87N)
• Inrush restraint
• Undercurrent monitoring (37)
• Overload protection (49)
• Under-/overvoltage protection (27/59)
• Under-/overfrequency protection (81O/U)
• Breaker failure protection (50BF)
• Phase unbalance or negative-sequence
protection (46)
• Phase-sequence monitoring (47)
• Synch-check (25)
• Auto-reclosure (79)
• Fault locator (21FL)
• Lockout (86)
