Features :-
- 4 current transformers
- 0/3 voltage transformers
- 3/7/11 binary inputs (thresholds configurable using software)
- 5/8 binary outputs (2 changeover / form C contacts)
- 1 life contact
- Pluggable current and voltage terminals.
Functions :-
- 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)
- Inrush restraint
- Trip-circuit supervision (74TC)
- Undercurrent monitoring (37)
- Overload protection (49)
- Undervoltage/overvoltage protection (27/59)
- Forward-power, reverse-power protection (32)
- Power factor (55)
- Overfrequency/underfrequency protection(81O/U)
- Circuit-breaker failure protection (50B/F)
- Intermittent ground fault protection
- Directional intermittent ground fault protection (67Ns)
- Unbalanced-load protection (46)
- Phase-sequence-voltage supervision (47)
- Voltage dependent inverse-time overcurrent protection (51V)
- Synchrocheck (25)
- Automatic reclosing (79)
- Fault locator (FL)
- Lockout (86)
- Rate-of-frequency-change protection (81R)
- Rate-of-voltage-change protection (27R/59R)
This Motor Protection relay block is easily insert in your schematic diagram and connect as you like way.
The relays have all the required functions to be applied as a backup relay to a transformer differential relay. The SIPROTEC 7SJ80 features “flexible protection functions”. Up to 20 additional protection functions can be created by the user. Therefore, protection of change for frequency or reverse power protection can be realized, for example. The relay provides circuit-breaker control, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages.
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