Multifunction Protection Relay
The SIPROTEC 4 7SJ63 can be used as a protective control and monitoring relay for distribution feeders and transmission lines of any voltage in networks that are earthed (grounded), low-resistance earthed, unearthed, or of a compensated neutral point structure. The relay is suited for networks that are radial or looped, and for lines with single or multi-terminal feeds. Regarding the time-overcurrent/directional timeovercurrent protection the characteristics can be either definite time, inverse time or user-defined.
The SIPROTEC 4 7SJ63 is equipped with motor protection applicable for asynchronous machines of all sizes.Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor.
The relay provides easy-to-use local control and automation functions. The number of controllable switchgear depends only on the number of available inputs and outputs. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switchgear (interlocking). The user is able to generate userdefined messages as well.
Overcurrent protection (definite-time/inverse-time/user-def.)
Directional overcurrent protection (definite-time/inverse-time/user-def.)
Sensitive dir./non-dir. earth-fault detection
Intermittent earth-fault protection
High-impedance restricted earth fault
Breaker failure protection
Flexible number of switching devices
Position of switching elements is shown on the graphic display
Local/remote switching via keyoperated switch
Control via keyboard, binary inputs, DIGSI 4 or SCADA system
Extended User-defined logic with CFC (e.g. interlocking)
Operational measured values V, I, f,...
Energy metering values Wp,Wq
Circuit-breaker wear monitoring
Trip circuit supervision
Fuse failure monitor
8 oscillographic fault records
– IEC 60870-5-103/ IEC 61850
– DNP 3.0/MODBUS RTU
Service interface for DIGSI 4 (modem)
Front interface for DIGSI 4
Time synchronization via IRIG B/DCF77
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