Siemens SIPROTEC 4 7SJ66 Multifunction Protection Numerical Relay
The Siemens SIPROTEC 4 7SJ66 Multifunction Protection Relay is an advanced numerical device for protection, control, and monitoring. It features flexible protection functions, allowing up to 20 customizable protections such as rate-of-frequency-change and reverse power protection. The integrated graphical logic editor (CFC) enables user-defined automation and control logic, making it ideal for modern power systems.
Technical Specifications
Protection Functions
Overcurrent, directional overcurrent, ground-fault, displacement voltage, intermittent ground fault, high-impedance restricted ground fault, motor and overload protection, temperature monitoring, voltage/frequency protection, rate-of-frequency-change, power protection, breaker failure, negative-sequence, phase-sequence monitoring, synchro-check, fault locator, lockout, auto-reclosure
Control & Logic:
Control of circuit-breakers and isolators, visualization of switch positions, operation via keyboard, binary inputs, DIGSI 4 or SCADA, user-defined logic (CFC)
Monitoring:
Measurement of V, I, f, energy metering (Wp, Wq), breaker wear, trip circuit, fuse failure, oscillographic fault records (8), motor statistics
Communication:
IEC 60870-5-103, IEC 61850, Modbus RTU, DNP3, RSTP Ethernet, USB for DIGSI 4, IRIG B & DCF77 synchronization
Hardware:
4 CT, 4 VT, 16/22/36 binary inputs, 7/10/23 outputs, spring terminals, graphic or 8-line display
Languages Supported: English, Spanish, Russian, Polish, Turkish
Key Benefits:
Unified protection, control, measurement, and automation; reliable DIGSI 4 configuration; proven performance worldwide; industry standard in digital protection
Overcurrent, directional overcurrent, ground-fault, displacement voltage, intermittent ground fault, high-impedance restricted ground fault, motor and overload protection, temperature monitoring, voltage/frequency protection, rate-of-frequency-change, power protection, breaker failure, negative-sequence, phase-sequence monitoring, synchro-check, fault locator, lockout, auto-reclosure
Control & Logic:
Control of circuit-breakers and isolators, visualization of switch positions, operation via keyboard, binary inputs, DIGSI 4 or SCADA, user-defined logic (CFC)
Monitoring:
Measurement of V, I, f, energy metering (Wp, Wq), breaker wear, trip circuit, fuse failure, oscillographic fault records (8), motor statistics
Communication:
IEC 60870-5-103, IEC 61850, Modbus RTU, DNP3, RSTP Ethernet, USB for DIGSI 4, IRIG B & DCF77 synchronization
Hardware:
4 CT, 4 VT, 16/22/36 binary inputs, 7/10/23 outputs, spring terminals, graphic or 8-line display
Languages Supported: English, Spanish, Russian, Polish, Turkish
Key Benefits:
Unified protection, control, measurement, and automation; reliable DIGSI 4 configuration; proven performance worldwide; industry standard in digital protection
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