Presently, I am reading about different types of transformer. I am stuck on 'spiral core or wound core transformer'. I didn't find any good explanation about it in the textbook I am reading. Searched on the internet in hope to find more detail, but same thing, no good description.
I am providing the text from the book I am reading as follows:
In spiral core, spirals of strip steel are wound through the window of perforated coil. The resultant structure provides continuous magnetic path unobstructed by butt or lap joints hence the path of reluctance is reduced.
I don't understand the words in bold. It will be helpful if it is possible to provide a picture for better understanding.