Multifunction Protection Relay block 7SK801

Features and technical specifications:

1. Motor Protection
2. CT inputs : 4 No’s
3. VT inputs : 3 No’s
4. Binary inputs :3/7 No
5. Binary output’s : 5/8 NO

The following functions are available

1. Time-overcurrent protection (50, 50N, 51, 51N)
2.  Directional time-overcurrent protection (67, 67N)
3. Sensitive dir./non-dir. ground-fault detection (67Ns, 50Ns)
4. Displacement voltage (59N/64)
5. High-impedance restricted ground fault (87N)
6. Inrush restraint
7. Undercurrent monitoring (37)
8. Overload protection (49)
9. Under-/overvoltage protection (27/59)
10. Under-/overfrequency protection (81O/U)
11. Breaker failure protection (50BF)
12. Phase unbalance or negative-sequence protection (46)
13. Phase-sequence monitoring (47)
14. Synch-check (25)
15. Auto-reclosure (79)
16. Fault locator (21FL)
17. Lockout (86)

This Multifunction Protection Relay block is easily insert in your schematic diagram and connect as you like way.

The 7SJ80 features “flexible protection functions”. 20 additional protection functions can be created by the user. For example, a rate of change of frequency function or a reverse power function can be created. The relay provides circuit-breaker control, additional primary switching devices (grounding switches, transfer switches and isolating switches) can also be controlled from the relay. Automation or PLC logic functionality is also implemented in the
relay. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (including: interlocking, transfer and load shedding schemes). The user is also allowed to generate user-defined messages. The communication module is independent from the protection. It can easily be exchanged or upgraded to future communication protocols.Removable current and voltage terminals provide the ideal solution for fast and secure replacement of relays. Binary input thresholds and current taps are software settings. There is thus no need to ever open the relay to adapt the hardware configuration to a specific application. The relay provides 9 programmable function keys that can be used to replace push buttons, select switches and control switches. The battery for event and fault recording memory can be exchanged from the front of the relay. The relay is available with IEC 61850 for incredible cost savings in applications (e.g. transfer schemes with synch-check, bus interlocking and load shedding schemes). This compact relay provides protection, control, metering and PLC logic functionality.
Secure and easy to use one page matrix IO programming is now a standard feature. The housing creates a sealed dust proof environment for the relay internal electronics. Heat build up is dissipated through the surface area of the steel enclosure. No dusty or corrosive air can be circulated over the electronic components. The relay thus will maintain its tested insulation characteristic standards per IEC, IEEE, even if deployed in harsh environment.

Line protection :-  The 7SJ80 units can be used for line protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point.

Transformer protection :- The relay provides all the functions for backup protection for transformer differential
protection. The inrush suppression effectively prevents unwanted trips that can be caused by inrush currents.
The high-impedance restricted ground fault protection detects short-circuits and insulation faults on the transformer.

Backup protection :- The 7SJ80 can be used as a stand alone feeder protection relay or as a backup to other protection relays in more complex applications.