The SIPROTEC 5 7SK82 is a compact, intelligent motor and generator protection relay from Siemens, designed for reliable and cost-effective protection of small to medium motors (100 kW – 2 MW). With the DIGSI 5 engineering tool and modular hardware, it provides comprehensive protection, control, monitoring, and measurement for industrial and utility applications
Technical Highlights
Main Function: Motor protection for 100 kW – 2 MW machines
Tripping: 3-pole
Inputs & Outputs:
4 CTs, 4 VTs (optional)
11 – 23 binary inputs, 9 – 16 binary outputs
Protection Functions:
Motor protection: start-up supervision, thermal overload (stator/rotor), restart inhibit, load jam, unbalance
Ground fault protection (directional / non-directional, harmonic, pulse method)
Arc, over/undervoltage, frequency, and power protection
Sensitive stator ground fault detection
QU (reactive power–undervoltage) protection
Control & Automation:
Graphical logic editor (CFC), synchrocheck, switchgear interlocking
Communication:
Ethernet RJ45 (IEC 61850, GOOSE, DIGSI 5)
2 pluggable modules – IEC 60870-5-103/104, Modbus TCP, DNP3, PROFINET IO
Redundancy: PRP / HSR, IEEE C37.94 fiber
Additional Features:
PMU (IEEE C37.118), IEEE 1588 time sync
Fault recording (80 s @ 8 kHz / 320 s @ 2 kHz)
Cyber security compliant with NERC CIP
Compact housing (1/3 × 19")
Tripping: 3-pole
Inputs & Outputs:
4 CTs, 4 VTs (optional)
11 – 23 binary inputs, 9 – 16 binary outputs
Protection Functions:
Motor protection: start-up supervision, thermal overload (stator/rotor), restart inhibit, load jam, unbalance
Ground fault protection (directional / non-directional, harmonic, pulse method)
Arc, over/undervoltage, frequency, and power protection
Sensitive stator ground fault detection
QU (reactive power–undervoltage) protection
Control & Automation:
Graphical logic editor (CFC), synchrocheck, switchgear interlocking
Communication:
Ethernet RJ45 (IEC 61850, GOOSE, DIGSI 5)
2 pluggable modules – IEC 60870-5-103/104, Modbus TCP, DNP3, PROFINET IO
Redundancy: PRP / HSR, IEEE C37.94 fiber
Additional Features:
PMU (IEEE C37.118), IEEE 1588 time sync
Fault recording (80 s @ 8 kHz / 320 s @ 2 kHz)
Cyber security compliant with NERC CIP
Compact housing (1/3 × 19")
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