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category： Relays
reference price：￥$600.00 - $1,300.00
The SIPROTEC 4 7SJ61 relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance earthed, isolated or compensated neutral point. When protecting motors, the SIPROTEC 4 7SJ61 is suitable for asynchronous machines of all sizes. The relay performs all functions of backup protection supplementary to transformer differential protection
The relay provides control of the circuitbreaker, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages. The flexible communication interfaces are open for modern communication architectures with control systems.
Overcurrent protection (definite-time/inverse-time/user-def.)
Sensitive earth-fault detection
Intermittent earth-fault protection
High-impedance restricted earth fault
Inrush - Current detection
Motor protection
– Undercurrent monitoring
– Starting time supervision
– Restart inhibit
– Locked rotor
– Load jam protection
Overload protection
Temperature monitoring
Breaker failure protection
Negative-sequence protection
Auto-reclosure
Lockout
Commands for control of a circuit-breaker and of isolators
Position of switching elements is shown on the graphic display
Control via keyboard, binary inputs, DIGSI 4 or SCADA system
User-defined logic with CFC (e.g. interlocking)
Operational measured values
Circuit-breaker wear monitoring
Slave pointer
Time metering of operating hours
Trip circuit supervision
8 oscillographic fault records
Motor statistics
System interface
– IEC 60870-5-103, IEC 61850
– PROFIBUS-FMS/-DP
– DNP 3.0/MODBUS RTU
Service interface for DIGSI 4 (modem)
Front interface for DIGSI 4
Time synchronization via IRIG B/DCF77
4 current transformers
3/8/11 binary inputs
4/8/6 output relays
