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.

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Features & functions

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 point
Motor Protection:
Suitable for asynchronous machines of all sizes
Backup Protection:
The relay performs all functions of backup protection supplementary to transformer differential protection

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