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What is the definition of ANSI 50N/51N or 50G/51G - Earth fault?

Article available in these languages: Spanish

Earth fault protection based on measured or calculated residual current values:
  • ANSI 50N/51N: residual current calculated or measured by 3 phase current sensors
  • ANSI 50G/51G: residual current measured directly by a specific sensor.

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