IEEE Power & Energy Magazine - May/June 2018 - 89

testing higher interrupter break capability has been made possible by modern synthetic testing techniques.

Breaker Opening
and Closing
In the early 1900s, the closing of the
breaker was usually done by manual

operation or a motor drive. latches were
provided to maintain the closed position.
Opening was accomplished by releasing
the latch to allow opening from compressed spring energy stored during the
closing stroke. releasing the latch could
be either manual or electrical. In the early 1920s, 220-kV breakers would have

making life visibly safer
figure 4. An interrupter deion grid
69 kV. (From Westinghouse Descriptive Bulletin 33-252, Jan. 1961.)

may/june 2018

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Power Line Marker
Meets FAA Advisory
Circular 70/7460-1L
(Dec. 2015)
Installs directly on
live lines up to 500 kV

Bird
Diverters

LED Obstruction
Lights

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800-722-8078 * pr-tech.com

ieee power & energy magazine

6709

modified by adding a second or pressure-generating break in series with the
main interrupting break. these contacts
were located in a separate chamber referred to as an explosive chamber, and
the arc would create pressure to force
oil flow into the interrupter grid's fiber
plate paths and into the arcing space,
enhancing deionization and interruption. this interrupter type is shown in
Figure 5 and applied at 138 kV.
as voltages increased, the deion
interrupter was made as a separate
grid block assembly that was inserted
into the main interrupter tubular support structure as separate units. this
resulted in an interrupter that could
include several grid blocks and associated interrupter contacts in series,
thus forming a complete multibreak
interrupter assembly. a grid block is
shown in Figure 6 and is assembled
in interrupter assemblies as shown in
FigureĀ 7, which is a family of these
interrupters for application at various
voltages up to 345 kV and interrupting
currents of 63 ka.
during the development of oil breakers, testing laboratory facilities had
limitations in test voltage and current
capabilities. Because of this, they were
limited in verification of only an individual break's voltage and current.

SpanLite

TM

89


http://www.pr-tech.com

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2018

Contents
IEEE Power & Energy Magazine - May/June 2018 - Cover1
IEEE Power & Energy Magazine - May/June 2018 - Cover2
IEEE Power & Energy Magazine - May/June 2018 - Contents
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IEEE Power & Energy Magazine - May/June 2018 - Cover3
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