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the siprotec 7sj66 unit is a numerical protection, control, and monitoring device. Siprotec 7sj66 is featuring the "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.
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
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)
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
english, spanish, russian, polish and turkish
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
spring-type terminals
4 current transformers
4 voltage transformers
16/22/36 binary inputs
7/10/23 output relays
graphic or 8 line display
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Kamothe, Navi Mumbai, Maharashtra 
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