SIPROTEC 7SK80

The SIPROTEC 7SK80 is a multi-functional motor protection relay designed to protect asynchronous motors of all sizes.

The relays have all the necessary functions to be utilized as a backup relay to a transformer differential relay. 

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DESCRIPTION

Basic Features

  • Has flexible protection functions as it allows users to create up to 20 additional protection functions
  • Protection of change for frequency or reverse power protection is possible
  • Provides circuit-breaker control, further switching devices and automation functions
  • Integrated programmable logic (CFC) allows users to add own functions (e.g. for the automation of switchgear (interlocking))
  • Allows user-defined messages to be generated
  • Definite and inverse time-overcurrent protection (phase/ground) (50, 50N, 51, 51N)
  • Directional time-overcurrent protection, ground (67N)
  • Directional overcurrent protection, ground (defi-nite/inverse)(67Ns, 50Ns))
  • Displacement voltage, zero-sequence voltage (59N)
  • Trip-circuit supervision (74TC)
  • Undercurrent monitoring (37)
  • Temperature monitoring (38)
  • Thermal overload protection (49)
  • Load jam protection (51M)
  • Locked rotor protection (14)
  • Overcurrent protection, voltage controlled (51V)
  • Undervoltage/overvoltage protection (27/59)
  • Forward-power, reverse-power protection (32)
  • Overfrequency/underfrequency protection(81O/U)
  • Circuit-breaker failure protection (50BF)
  • Phase-balance current protection (negative-sequence protection) (46)
  • Unbalance-voltage protection and/or phase-sequence monitoring (47)
  • Lockout (86)