The Primary Network

The primary network is similar to the low-voltage network in so far as the interconnection of the secondary mains is concerned. Two transformation steps are required in the primary network described here, and only one in the low-voltage network. Nevertheless, the primary network has economic possibilities which should be considered for areas of medium load density. A preliminary study of the so-called primary network indicated that the principle had possibilities worthy of exploitation. It was, therefore, decided that such a network would be installed if at all feasible to obtain operating experience with the system. The design work for this initial installation is complete and construction work has started. It is recognized that there is a number of problems to be worked out more thoroughly. As experience in operation is obtained, and with intensive study of the requirements it is expected that improvements will be made and the designs materially simplified. Even with the limitations existing at the time of writing it appears that the primary network offers important advantages over the radial system for certain types of load.