State the reasons for balancing single-phase loads across three-
phase supply.
12. Environmentalists often say that steel transmission towers are a
‘blot the landscape’. State the standard voltages used for generation, transmission and
distribution the United Kingdom. star.
16. delta
b.11.
17. Why continue use steel towers for
transmission the National Grid network?
14. Why the distribution from local sub-stations end users, for the
most part, underground cables the United Kingdom?
15. State the meaning ‘polyphase supply system’. What are the advantages connecting three-phase supply:
a. Briefly describe how and why generate three-phase supply
compared single-phase supply.
.
13
