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This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
What is the definition of ANSI 64G - 100 % stator earth fault?
Protection of generators with earthed neutral against phase-to-earth insulation faults 
in stator windings. This function may be used to protect generators connected to 
step-up transformers
100 % stator earth fault is a combination of two protection functions:
  • ANSI 59N/64G1: neutral voltage displacement, protection of 85 % to 90 % of the stator winding, terminal end.
  • ANSI 27TN/64G2: thrid harmonic undervoltage, protection of 10 % to 20 % of the stator winding, neutral point end.

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