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MV Secondary Relays

Microprocessor Over Current, Short Circuit, Earth Leakage Relay

Protection Functions

F50/51, F50N/51N, F51BF, F68

Programmable three phase over current and earth leakage relay with current-time curve expedients to protection of MV&;HV energy transmission and distribution systems.

Its phase and neutral current inlets can be selected as 1 A or 5A.

Inlet circuit of neutral current has got an active filter which percolates the 3. Harmonic.



Technical Features

  • 2 pieces over current protection level
  • 2 pieces of earth leakage short-circuit protection
  • Selectional current-time curves
  • Circuit breaker failure protection
  • Blockage inlet and outlet of program for selectivity at pilot line
  • Mod-bus communication protocol
  • UL/CSA listing


 

 
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