https://www.noratel.com/company/transformer-school/they can all be downloaded from the site as well.
Noratel Transformer School
Technical Information - Definitions144 kB
Technical Information - Transformer symbols379 kB
Technical Information - The transformer5.2 MB
Technical Information - Toroidal core transformers666 kB
Technical Information - Reactors / Chokes331 kB
Technical Information - Motor startup280 kB
Technical Information - DC power supplies1.4 MB
Technical Information - Transformer rating616 kB
Technical Information - IP ratings510 kB
Technical Information - 3-Phase transformer688 kB
Technical Information - Ferrite transformers1.5 MB
Technical Information - Earth faults224 kB
Technical Information - Transformers and fuses538 kB
Technical Information - Transformer care597 kB
