ABSTRACT

This Chapter assumes that the designer has access to a recognised reference book on high voltage systems such as the ABB Switchgear Manual or the Siemens Power Engineering guide.56

7.1 SINGLE LINE DIAGRAM

The single line diagram is the key drawing for switchgear and protection.Much thought needs to be put into it to make sure that it represents the simplest and lowest cost arrangement of switchgear, transformers cabling and protection equipment that will provide what is needed. It must be updated with every change because it is the key drawing long into the future. Drawing E1 on the CD for the Paerau scheme is a good example of a single line diagram.