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  Paramount importance is the reliability and safety of high voltage equipment pertaining to electrical engineering. In this respect, Tan Delta Testing or Dissipation Factor Testing has emerged as an indispensable tool for diagnosis. While it is widely known that Tan Delta Testing is based on fundamentals, this article seeks to find out more about the advanced techniques and applications in order to show how this method has changed over time in response to increasing needs from industry players today.   What is Tan Delta Testing?   Understanding Tan Delta Testing   When a voltage is applied, any defects or foreign materials within the insulation lead to part of the energy being lost as heat. By quantifying this dissipation factor, tan delta testing provides crucial insights into the state and soundness of insulation.   How does Tan Delta Testing work?   In simpler terms, Tan Delta Test determines how much dielectric losses a material will have when subjected to hig