IEEE Power & Energy Magazine - May/June 2018 - 93

synchronism. the three mechanisms
were mechanically trip free. Figure 11
shows the trip-free operation in which
the mechanical linkage disconnects
from the closing piston for an air cylinder diameter of 10 in. Mechanisms that
used air pressure for both closing and
operating had valves that provided fast
release of the closing air pressure to
allow immediate opening air pressure
to be applied. these were identified as
pneumatically trip free.

Later Model Design
Features
the design of early circuit breakers
consisted of two interrupters bridged
by a movable metal member (cross
arm) for conducting current when the
breaker is closed or breaking the circuit and providing a disconnect gap for
isolation when it is open. this was an
important feature maintained in the
later-model oil breakers. additionally,
there had been significant changes in

figure 11. The Westinghouse pneumatic mechanism type AA-10 in a
trip-free position. (From Westinghouse
Descriptive Bulletin 33-350, June 1959.)

figure 12. A cross-section view of
a 138-kV OCB. (From Westinghouse
Descriptive Bulletin 33-253,
May 1960.)

structure, mechanical operation, and
bushings for insulating the conductors
from the grounded tank structure and
current transformers for intelligence.

Figure 12 is the cross section of a pole
unit of a modern OCB. the bushing insulates the conductor from the grounded structure consisting of the tank and


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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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