Multifunction protection
SIPROTEC 7SJ66
SIPROTEC 7SJ66 is a numerical protection, control and monitoring device. SIPROTEC 7SJ66 is features flexible protection functions. Up to 20 protection functions can be added according to individual requirements. Thus, for example, a 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.
Features
Hardware
- Spring-type terminals
- 4 current transformers
- 4 voltage transformers
- 16 to 36 binary inputs
- 7 to 23 output relays
- Graphic or 8 line display
Communication interfaces
- System port:
– IEC 61850
– DNP TCP
– IEC 60870-5-103
– 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
Functions
Protection functions
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
Applications
Line and feeder protection:
Protection of high and medium voltage networks with earthed (grounded), low-resistance grounded, isolated or compensated neutral pointMotor Protection:
Suitable for asynchronous machines of all sizesBackup Protection:
The relay performs all functions of backup protection supplementary to transformer differential protection
