Turning now to larger substations at both transmission and distribution voltages
(see Fletcher [4, chap. 9]), where security of supply is critical, the double busbar
arrangement shown in Figure 9.9 has been extensively used in the UK.Avariation
of this is shown in Figure 9.10 which illustrates a multisection double busbar
arrangement. A third layout, reproduced in Figure 9.11, is known as a one and