Book excerpt: This book provides a comprehensive resource on technical, application and operational aspects of all types of electrical transformers and power systems, covering operation theory; transformer construction, installation, operation and maintenance; principal transformer connections; transformer types; troubleshooting; circuit breakers; disconnecting devices; fuses; lightning or surge arrestors; protective relays; storage batteries; reactors; capacitors; rectifiers; instruments; and insulation. Illustrations and diagrams are included throughout the written presentation.