100 Electrical Power Systems Technology
system except, of course, that there is no coal-pulverizing system. These
subsystems may be studied to learn the various parts of a power system
in more detail.
HYDROELECTRIC SYSTEMS
The use of water power goes back to ancient times. It has been devel-
oped to a very high degree, but is now taking a secondary role due to the
emphasis on other power sources that are being developed in our country
today. Electrical power production systems using water power were de-
Figure 4-10. The boiler-water subsystem (Courtesy Omnidata, Inc.)Figure 4-11. The steam and turbine subsystem (Courtesy Omnidata, Inc.)