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Product offer - Multifunctional relays for Power Engineering


Automatic control and protection set depends on the analogue channel configuration and is limited by the maximum number of software configuration objects of the iZAZ600. In the software variant, the set is chosen from a basic application library and it is possible to configure a dedicated, individual group of required protective functions.

The details on the availability of functions in certain hardware variants are listed in Table 1 of the Catalog Card (PDF 1,5 MB). Other, non-standard, individual hardware configurations can be also manufactured.

Protective function and automatic control library

  • Overcurrent (50/51)
  • Inverse time overcurrent (51)
  • Peak overcurrent (wide frequency range) (50/51)
  • Inverse time overcurrent (49R)
  • Thermal overcurrent (49M)
  • Negative sequence overcurrent (46)
  • Inverse time negative sequence overcurrent (46)
  • Overvoltage (59)
  • Peak overvoltage (wide frequency range) (59)
  • Undervoltage (27)
  • Residual overvoltage (59N)
  • Negative sequence overvoltage (47)
  • Positive sequence undervoltage (27D)
  • Ground fault overcurrent (50N/51N)
  • Ground fault inverse time overcurrent (51N)
  • Ground fault directional - MV (59N/67N)
  • Earth-fault admittance, non-directional (21N)
  • Earth-fault admittance, directional (0÷90), capacitative (21N)
  • Frequency (81H/81L)
  • Rate of frequency change (81S)
  • Incremental rate of frequency change (81SA)
  • Overexcitation (24)
  • Directional power supervision, against reverse power (32R)
  • Directional power supervision, against load rejection (32L)
  • Against incorrect phase rotation sequence (47)
  • Against generator excitation loss (40/27)
  • Underimpedance, circular (21)
  • Against accidental switching of a non-excited generator (50/27)
  • Differential for generator, transformer, generator-transformer block with interlock from 2 h and 5 h (87G/87T/87B)
  • Earth-fault differential REF (IL1+IL2+IL3-3Io) (64REF)
  • Earth-fault of rotor (64R)
  • Earth-fault of stator 100% (3h difference) (64S)
  • Against synchronism loss / pole slip (78)
  • Power factor monitoring tgφ (55)
  • Automatic underfrequency load shedding
  • Local breaker failure (50BF)
  • Synchrocheck (25)

Template by Linelab.
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