SIPROTEC 7SJ62, SIPROTEC 7SJ62 price, numerical protection relay siemens, numerical relay protection of transformer,SIEMENS Numerical Relay SIPROTEC 7SJ62 and SIPROTEC 7SJ62 price

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The SIPROTEC 4 7SJ62 relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance earthed, isolated or compensated neutral point. With regard to motor protection, the SIPROTEC 4 7SJ62 is suitable for asynchronous machines of all sizes.

The relay performs all functions of backup protection supplementary to transformer differential protection. 7SJ62 is featuring the "flexible protection functions". Up to 20 protection functions can be added according to individual requirements. Thus, for example, a rate-of-frequency-change protection or reverse power protection can be implemented.

The relay provides control of the circuit-breaker 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
  • Over current protection (definite-time/inverse-time/user-def.)
  • Directional overcurrent protection (definite-time/inverse-time/user-def.)
  • Sensitive dir. earth-fault detection
  • Displacement voltage
  • Intermittent earth-fault protection
  • Directional intermittent ground fault protection
  • High-impedance restricted earth fault
  • Inrush Restraint
  • Motor protection
  • Overload protection
  • Temperature monitoring
  • Under-/overvoltage protection
  • Under-/overfrequency protection
  • Rate-of-frequency-change protection
  • Power protection (e.g. reverse, factor)
  • Undervoltage controlled reactive power protection
  • Breaker failure protection
  • Negative-sequence protection
  • Phase-sequence monitoring
  • Synchro-check
  • Auto-reclosure
  • Fault locator
  • 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
  • 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
  • 8/11 binary inputs
  • 8/6 output relays

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