Siemens SIPROTEC 4 7SJ66 Multifunction Protection numerical Relay

Siemens SIPROTEC 4 7SJ66 Multifunction Protection numerical Relay is numerical protection, control, and monitoring device. SIPROTEC 7SJ66 is featuring “flexible protection functions”. Up to 20 protection functions can be added to Siprotec 7SJ66 multifunction relay according to individual requirements. Thus, for example, rate-of-frequency-change protection or reverse power protection can be implemented. The relay provides control of the circuit-breaker, further switching devices, and automation functions. The integrated Graphical logic editor (CFC) allows the user to implement its own functions, e. g. for the automation of switchgear (interlocking). The communication interfaces support the easy integration into modern communication networks.

 SIPROTEC 7SJ66 Multifunction protection:

• Overcurrent protection
• Directional overcurrent protection
• Sensitive directional ground-fault detection
• Displacement voltage
• Intermittent ground-fault protection
• Directional intermittent ground fault protect
• High-impedance restricted ground fault
• Inrush restraint
• Motor protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Rate-of-frequency-change protection
• Power protection (e.g. reverse, factor)
• Undervoltage controlled reactive power protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchro-check
• Fault locator
• Lockout
• Auto-reclosure

Control functions/programmable logic

• Commands for control of CB and of isolators
• Graphical visualization of switch positions
• Control via keyboard, binary inputs, DIGSI 4, or SCADA system
• User-defined logic with CFC (e.g. interlocking)

Monitoring functions

• Operational measured values V, I, f
• Energy metering values Wp, Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor statistics

Languages

• English, Spanish, Russian, Polish, and Turkish

Communication interfaces

• System interface protocols: IEC 60870-5-103, IEC 61850, Modbus RTU, DNP3
• Electrical and optical interface
• RSTP (Redundancy Protocol for Ethernet)
• Service interface for DIGSI 4 or RTD-Box
• Front USB interface for DIGSI 4
• Time synchronization via IRIG B, DCF77

Hardware

• Spring-type terminals
• 4 current transformers
• 4 voltage transformers
• 16/22/36 binary inputs
• 7/10/23 output relays
• Graphic or 8 line display

SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. The homogenous system platform, the unique DIGSI 4 engineering program, and extensive experience of more than a million successfully operating devices in the field worldwide – thanks to these unique advantages, SIPROTEC 4 enjoys top recognition among users worldwide. SIPROTEC 4 is the industry standard for digital protection technology today in all fields of application.