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

Function overview
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)