SIPROTEC 7SJ61 relay manual, SIEMENS Siprotec Protection Relay, SIEMENS Numerical Relays manual, SIEMENS make Numerical Relay, SIEMENS Numerical Relay SIPROTEC 7SJ61 relay manual

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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.

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 switch gear (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
  • Over current 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
  • 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
  • 1 serial protection data (R2R) interface
  • Front interface for PC connection
  • System interface
    • IEC 61850 Ethernet
    • IEC 60870-5-103 protocol
  • Service / modem interface (rear)
  • Time synchronization via IRIG-B, DCF77 or system interface
  • 4 current transformers
  • 3/8/11 binary inputs
  • 4/8/6 output relays

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