Overcurrent protection SIPROTEC 7SJ80

Overcurrent protection SIPROTEC 7SJ80

Product Overview

The SIPROTEC 7SJ80 relays can be used for feeder protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point. The relays have all the required functions to be applied as a backup relay to a transformer differential relay.

Features :

Hardware 

  • 4 current transformers
  • 0/3 voltage transformers
  • 3/7/11 binary inputs (thresholds configurable using software)
  • 5/8 binary outputs (2 changeover / form C contacts)
  • 1 life contact
  • Pluggable current and voltage terminals.

Functions :

  • Definite and inverse time-overcurrent protection (phase/ground) (50, 50N, 51, 51N)
  • Directional time-overcurrent protection (phase/ground) (67, 67N)
  • Directional sensitive ground fault protection (67Ns, 50Ns)
  • Overvoltage protection, zero-sequence system (59N)
  • High-impedance restricted ground-fault protection (87N)
  • Inrush restraint
  • Trip-circuit supervision (74TC)
  • Undercurrent monitoring (37)
  • Overload protection (49)
  • Undervoltage/overvoltage protection (27/59)
  • Forward-power, reverse-power protection (32)
  • Power factor (55)
  • Overfrequency/underfrequency protection(81O/U)
  • Circuit-breaker failure protection (50B/F)
  • Intermittent ground fault protection
  • Directional intermittent ground fault protection (67Ns)
  • Unbalanced-load protection (46)
  • Phase-sequence-voltage supervision (47)
  • Voltage dependent inverse-time overcurrent protection (51V)
  • Synchrocheck (25)
  • Automatic reclosing (79)
  • Fault locator (FL)
  • Lockout (86)
  • Rate-of-frequency-change protection (81R)
  • Rate-of-voltage-change protection (27R/59R)

More Information

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+66 2 063 5262-3, +66 83 440 1404