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What is the definition of ANSI 27TN/64G2 - Third harmonic undervoltage?
Protection of generators with earthed neutral against phase-to-earth insulation faults,
by the detection of a reduction of third harmonic residual voltage.
Protects the 10 to 20 % of the stator winding, neutral point end, not protected by the
ANSI 59N/64G1 function, neutral voltage displacement.
Characteristics
  • choice of 2 tripping principles, according to the sensors used:
*fixed third harmonic undervoltage set point
*adaptive neutral and terminal third harmonic voltage comparator set point
  • time-delayed definite time (DT) tripping.

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