IEEE Power & Energy Magazine - January/February 2014 - 94

figure 14. A Westinghouse
"Telluride" glass insulator (photo courtesy of Bill Meier at www.insulators.
info, used with permission).

figure 15. One of the two main transformers, showing segregated coil construction (photo courtesy of the Fort
Lewis College Center for Southwest
Studies).

time at different voltages, from 3,000
V to 60,000 V. The spacing between
conductors was also changed for certain tests. Various measurements and
observances of the insulators would
be made at each test voltage. Notations regarding weather conditions
94

ieee power & energy magazine

figure 16. The Weston wattmeter and field coil. This arrangement allowed the
wattmeter to slide in and out of the field coil so that different ranges could be
obtained (photo from E.D. Cockins, Ralph Davenport Mershon, 1956).

were also made and correlated with
the measurements.
Near the conclusion of testing,
the participants decided to stage
one gra nd final tes t
by taking the voltage
level up to 133,000 V.
To s e t t h e t e s t u p ,
they removed a span
of conductor from the
Pomona and General Electric circuits,
leaving a short line of
500 ft (152 m) from the
power house to the end
of the line. The voltage
was run up to 110,000 V,
held for a short period,
and then increased to
133,000 V. The voltage
was held for several
minutes until the current jumped from the
terminals of the transformers to the iron case,
shutting down the plant.
Apparently, it was quite a show, providing some anxious moments for the
awestruck participants.

differently spaced conductors. Numerous tests were conducted with the following horizontal conductor spacing:
15 in, (38.1 cm), 22 in (55.9 cm), 35 in
(88.9 c m), a nd 52 i n
(132.1 cm). The test results
were graphed with curves
(see figure 17). As the
graph indicates, engineers
confirmed that line losses
decreased when the distance between conductors
was increased. Another
focal point of the wattsloss tests was to determine the inf luence of
varying weather conditions on line loss. A series
of weather recordings
were made at the Ames
pla nt a nd G old K i ng
Mine of the following
elements, each day over a
33-day period: barometric
pressure, temperature,
humidity, wind direction,
and wind velocity. It was concluded that
line losses between conductors are not
affected by weather conditions, with
the exception of precipitation, which did
increase line losses.
Insulators were observed during
the day and night at various voltages.

Near the
conclusion
of testing, the
participants
decided to
stage one
grand final
test by taking
the voltage
level up to
133,000 V.

Test Results
one of the test objectives was to compare and determine losses between

january/february 2014


http://www.insulators

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - January/February 2014

IEEE Power & Energy Magazine - January/February 2014 - Cover1
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IEEE Power & Energy Magazine - January/February 2014 - Cover3
IEEE Power & Energy Magazine - January/February 2014 - Cover4
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