Siprotec 7SJ64, numerical protection relay siemens, numerical relay protection of transformer, SIEMENS Numerical Relay Siprotec 7SJ64 numerical relay

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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 ‚Äč

The relay provides control of the circuit breaker, 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.
Protection functions
  • 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
Control functions/programmable logic
  • 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)
Monitoring functions
  • Operational measured values
  • Circuit-breaker wear monitoring
  • Slave pointer
  • Time metering of operating hours
  • Trip circuit supervision
  • 8 oscillographic fault records
  • Motor statistics
Communication interfaces
  • Front interface for connecting a PC
  • System interface
    • 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
  • 4 current transformers
  • 3/8/11 binary inputs
  • 4/8/6 output relays

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