SIPROTEC 7SJ80
The SIPROTEC 7SJ80 relays is designed to be used for feeder protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point.
They have all the necessary functions to be utilized as a backup relay to a transformer differential relay.
Enquiry about SIPROTEC 7SJ80
Basic Features
- Has flexible protection functions as it allows users to create up to 20 additional protection functions
- Protection of change for frequency or reverse power protection is possible
- Provides circuit-breaker control, further switching devices and automation functions
- Integrated programmable logic (CFC) allows users to add own functions (e.g. for the automation of switchgear (interlocking))
- Allows user-defined messages to be generated
- Definite and inverse time-overcurrent protection (phase/ground) (50, 50N, 51, 51N)
- Directional time-overcurrent protection (phase/ground) (67, 67N)
- Directional sensitive ground fault protection (67Ns, 50Ns)
- Overvoltage protection, zero-sequence system (59N)
- High-impedance restricted ground-fault protection (87N)
- Trip-circuit supervision (74TC)
- Undercurrent monitoring (37)
- Overload protection (49)
- Undervoltage/overvoltage protection (27/59)
- Forward-power, reverse-power protection (32)
- Overfrequency/underfrequency protection(81O/U)
- Circuit-breaker failure protection (50B/F)
- Unbalanced-load protection (46)
- Phase-sequence-voltage supervision (47)
- Synchrocheck (25)
- Automatic reclosing (79)
- Fault locator (FL)
- Lockout (86)