Overcurrent Protection Relay
The SIPROTEC Compact 7SK80 is a multi-functional motor protection relay. It is designed for protection of asynchronous motors of all sizes. The relays have all the required functions to be applied as a backup relay to a transformer differential relay. The SIPROTEC Compact 7SK80 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.
Conformal coating available (NEW)
Pluggable current and voltage terminals
Binary input thresholds settable using DIGSI (3 stages)
Secondary current transformer values (1 A / 5 A) settable using DIGSI
9 programmable function keys
Buffer battery exchangeable from the front
USB front port
2 additional communication ports
Integrated switch for low-cost and redundant optical Ethernet rings
Ethernet redundancy protocols RSTP, PRP and HSR for highest availability
Relay-to-relay communication through Ethernet with IEC 61850 GOOSE
Millisecond-accurate time synchronization through Ethernet with SNTP (over Port A or Port B)
Number of binary binputs and inary outputs by connection from up to two SICAM I / O-Units extendable.
Overcurrent protection (50, 50N, 51, 51N)
Directional overcurrent protection, ground (67N)
Sensitive dir./non-dir. ground-fault detection (64Ns, 67Ns767N)
- Undercurrent monitoring (37)
- Starting time supervision (48)
- Restart inhibit (66/86)
- Locked rotor (14)
- Load jam protection (51M)
Thermal Overload protection (49)
Under-/overvoltage protection (27/59)
Frequency protection (81O/U)
Breaker failure protection (50BF)
Unbalance-load protection (46)
Commands for the ctrl. of CB, disconnect switches (isolators/isolating switches)
Control through keyboard, binary inputs, DIGSI 4 or SCADA system
User-defined PLC logic with CFC (e.g. interl.)
Operational measured values , ,
Energy metering values W
p , W
Circuit-breaker wear monitoring
Minimum and maximum values
Trip circuit supervision
Fuse failure monitor
8 oscillographic fault records
- IEC 61850
- IEC 60870-5-103
- DNP 3.0
- MODBUS RTU
Ethernet interface for DIGSI 4
USB front interface for DIGSI 4
4 current transformers
0/3 voltage transformers
3/7 binary inputs (thresholds configurable using software)
5/8 binary outputs (2 changeover/Form C contacts)
0/5 RTD inputs
1 live-status contact
The SIPROTEC 7SK80 unit is a numerical motor protection relay that can perform control and monitoring functions and therefore provide the user with a cost-effective platform for power system management, that ensures reliable supply of electrical power to the customers. The ergonomic design makes control easy from the relay front panel. A large, easyto- read display was a key design factor.
The integrated control function permits control of disconnect devices, grounding switches or circuit-breakers through the integrated operator panel, binary inputs, DIGSI 4 or the control or automation system (e.g. SICAM).
The integrated logic characteristics (CFC) allow the user to
add own functions for automation of switchgear (e.g. interlocking)
or switching sequence. The user can also generate
user-defi ned messages. This functionality can form the base
to create extremely flexible transfer schemes.
Operational measured value
Extensive measured values (e.g. I, V), metered values
(e.g.Wp,Wq) and limit values (e.g. for voltage, frequency)
provide improved system management.
Event logs, trip logs, fault records and statistics documents are stored in the relay to provide the user or operator with all the key data required to operate modern substations.
The SIPROTEC 7SK80 device is specifically designed to protect induction-type asynchronous motors.
SIPROTEC 7SK80 units can be used for line protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point.
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.
As a backup protection the SIPROTEC 7SK80 devices are universally applicable.
Switchgear cubicles for high / medium voltage
All units are designed specifically to meet the requirements
of high / medium-voltage applications. In general, no separate
measuring instruments (e.g., for current, voltage, frequency,
…) or additional control components are necessary.
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