Features and technical specifications:
- Motor Protection
- CT inputs : 4 No’s
- VT inputs : 3 No’s
- Binary inputs : 3/7 No’s
- Binary output’s : 5/8 No’s
- RS485 Communication Port
The following functions are available
- Definite and inverse time-overcurrent protection (phase/ground) (50, 50N, 51, 51N)
- Directional time-overcurrent protection, ground (67N)
- Directional overcurrent protection, ground (defi-nite/inverse)(67Ns, 50Ns))
- Displacement voltage, zero-sequence voltage (59N)
- Trip-circuit supervision (74TC)
- Undercurrent monitoring (37)
- Temperature monitoring (38)
- Thermal overload protection (49)
- Load jam protection (51M)
- Locked rotor protection (14)
- Intermittent ground fault protection
- Directional intermittent ground fault protection (67Ns)
- Overcurrent protection, voltage controlled (51V)
- Restart inhibit (66/86)
- Undervoltage/overvoltage protection (27/59)
- Forward-power, reverse-power protection (32)
- Power factor (55)
- Overfrequency/underfrequency protection(81O/U)
- Circuit-breaker failure protection (50BF)
- Phase-balance current protection (negative-sequence protec-tion) (46)
- Unbalance-voltage protection and/or phase-sequence monitoring (47)
- Start-time supervision (48)
- 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.
Applications
Motor protection :-
The SIPROTEC 7SK80 device is specifically designed to protect induction-type asynchronous motors..
Transformer protection:-
The SIPROTEC 7SK80 device 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.
Benefits:-
1. Pluggable current and voltage terminals
2. Binary input thresholds settable using DIGSI (3 stages)
3. Secondary current transformer values (1 A / 5 A) settable using DIGSI
4. 9 programmable function keys
5. 6-line display
6. Buffer battery exchangeable from the front
7. USB front port
8. 2 additional communication ports
9. Integrated switch for low-cost and redundant optical Ethernet rings
10. Ethernet redundancy protocols RSTP, PRP and HSR for highest availability
11. Relay-to-relay communication through Ethernet with IEC 61850 GOOSE
12. Millisecond-accurate time synchronization through Ethernet with SNTP (over Port A or Port B)
13. Number of binary binputs and inary outputs by connection from up to two SICAM I / O-Units extendable.
The SIPROTEC Compact 7SK80 is a multifunctional motor protection relay. It is designed for asynchronous induction-type motors of all sizes. The relays have all the functionality to be applied as a backup relay to a transformer differential relay. The 7SK80 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: low voltage starting, automatic restart, 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.
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