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DJA Engineering
  • Home
  • About DJA
    • Dr. David Yaney
    • Partners
  • Expertise
  • Articles
  • Resources
  • Contact

Articles

Two Meter 3-phase Metrology

One aspect of 3-phase power metrology that’s not very well-known is that it’s possible to fully quantify the system with just 2 voltage/current measurements. This is commonly referred to as a, “corner grounded delta” configuration or sometimes as the “two meter method.” One day I decided to see if I could derive this from first principles on my white board and got lucky on the first try. This is a picture of my derivation which my colleagues jokingly called, “Yaney’s Conjecture.” [read full article]

Voltage Induced in the Rogowski Coil due to a Threading Current

This is a short derivation of the Rogowski equation written with my colleague Dr. Kartikeya Tripathi back in 2010. The first time a new user observes the remarkable properties of the Rogowski geometry (first published by Rogowski and Steinhaus in 1912) to create a current measuring aperture with a flat spatial response and also to reject stray magnetic fields form non-threading currents it looks magical. Like all things magical, it is not. [read full article]

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Dr. David S. Yaney
DJA Engineering
Email: info@djaengineering.com
Poolesville, Maryland

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