The SIPROTEC 7SC80 feeder protection can be used for protection and automation of medium voltage distribution feeders with grounded or low resistance grounded, isolated, or compensated neutral point. The 7SC80 features “flexible protection functions”. 20 additional protection functions can be created by the user. For example, a rate of change of frequency function or a reverse power function can be created. The relay provides circuit-breaker control.
Additional primary switching devices (grounding switches, transfer switches and isolating switches) can also be controlled from the relay. Automation or PLC logic functionality is also implemented in the device. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (including: interlocking, transfer and load shedding schemes). The user is also allowed to generate user-defined messages. The upgrade of device and communication firmware is also possible via Ethernet.
Control functions/programmable logic
•Commands for the ctrl. of CB, disconnect switches (isolators/isolating switches)
•Control through keyboard, binary inputs, DIGSI 4 or SCADA system
•User-defined PLC logic with CFC (e.g. interlocking)
•Operational measured values V, I, f
•Energy metering values Wp,Wq
•Minimum and maximum values
•Circuit-breaker wear monitoring
•Fuse failure monitor
•8 oscillographic fault records
•Trip circuit supervision