b. they range in size from 150
a.
transformer substation
watts to 30 kilowatts
b.
converter substation
c. they produce either 50-cycle or
c.
frequency-changer substation
60-cycle current
d.
voltage-regulator substation
d. they are driven by gasoline
engines
19. Why
are
distribution
transformers
connected
to
the
17. After a thorough study of
primary feeders of a system?
figure 11, which of the sites A, B,
a. reduce voltage to a usable value
C, or D do you decide is the best
b. regulate current flow to the
location for a generator to supply
installation
all the buildings shown?
c. reduce amperage to the smaller
a. A
c. C
distribution lines
b. B
d. D
d. insure constant voltage in the
primary
Fifth requirement.
Multiple-choice
exercises 18 through 20 are designed
20. In a transformer the circuit
to enable you to show what you have
from which energy is received is
learned
about
substations
and
called the primary circuit, while
transformers.
the
receiving
circuit
is
the
secondary.
Why do transformers
18. Many European countries use
often have taps on the primary
25-cycle current in their power
winding?
systems, while in the United States
a. insure constant voltage in the
60 cycles is standard. Assume that
primary
for
a
proposed
overseas
b. maintain full secondary voltage
installation there is a local power
c. insure that safe voltage levels
plant nearby producing a sufficient
are being used
amount of 25-cycle current.
Since
d. regulate current flow from one
your equipment is rated for 60
circuit to another
cycles, what must you install?
1-19
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