ZLV Distance

Selective, fast and reliable protection in overhead lines and cables

  • Single or Double-breaker bay protection
  • 21/21N Distance protection for ground and phase faults
  • Up to 6 reversible protection zones with mono or three phase tripping systems
  • Sub-cycle operating time
  • 50SUP Overcurrent supervision for distance protectio
  • 68/78 Lockout and/or trip due to power oscillation
  • 85 Teleprotection schemes for distance and overcurrent  elements
  • 50-51 / 50Q-51Q / 50N-51N Ovecurrent prot (ph+ground)
  • 67 / 67Q / 67N Directional overcurrent prot (ph+ground)
  • 27/59 Under/over voltage (phases)
  • 59N Ground overvoltage
  • 81M/m Over/under frequency and rate-of-change prot
  • 49 Thermal image
  • 46 Open phase: I2/I1 (current unbalance)
  • 50BF Breaker failure
  • 27WI Weak infeed logic
  • 50SOF Switch-on-to-fault detector
  • 50STUB Stub bus protection
  • 79 Recloser
  • FL Fault locator
  • 25 Synchrocheck
  • Mutual Coupling Compensation in Double Circuits
  • Saturation Detector
  • Load Encroachment logic
  • Phase Selector
  • Virtual I/Os for Teleprotection schemes

Related

Literature

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