Design of power transformers – e-lesson #15: Insulation in a nutshell

This lesson provides an overview of two key methods for applying PD Inception curves in transformer insulation design - the maximum electric field method and the cumulative method. We'll discuss how these approaches handle creepage stress, edge field stress, and compare high-temperature insulation systems to common mineral oil. The lesson recaps the exponential shape and logarithmic representation of PD Inception curves, emphasizing the importance of oil duct length on electrical field stress. Distinctions between homogeneous and non-homogeneous areas of the main insulation will be highlighted, along with common evaluation techniques. A detailed insulation design example will be used to demonstrate the application of these methods. The lesson will conclude with considerations for using alternative insulation fluids and materials.

Illustration credit: Infologic Design

In the event, course author and host Mr. Aleksandar Lojpur talks about application of PD inception field strength curves in oil gaps through maximum electric field method and cumulative method, creepage and more.