IEEE Power & Energy Magazine - May/June 2016 - 86

to the three interrupting breaks connected in series. The first break was
adjacent to the blast valve, and breaks
2 and 3 were fed high-pressure gas
from the valve manifold by tubes. The
138-kV design was similar, except it
had only two breaks in series.

The Evolution of the
Interrupter Design

figure 1. A two-pressure prototype interrupter in the Westinghouse High Power
Laboratory. (Photo courtesy of the Westinghouse Electric Corporation with contrast enhanced by the authors using Photoshop Elements 13.)

direct tests of 40 kA at 44 kV, or onethird of the 230-kV breaker line-toground voltage.

86

ieee power & energy magazine

The high-pressure reservoir for the
230-kV design was on one end of the
interrupter and supplied the flow of gas

The power systems in the United States
are based on a 60-Hz (60 cycles/s) alternating current (ac) design. The ac
current goes through zero twice every cycle. For symmetrical currents,
zeros occur every 8.33 ms. Fault currents are limited by the inherent inductance of the connected system and
are many times larger in magnitude
than normal load currents. Because of
the inherent inductance in the circuit,
conservation of flux linkages requires
that the current not change magnitude

may/june 2016



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2016

IEEE Power & Energy Magazine - May/June 2016 - Cover1
IEEE Power & Energy Magazine - May/June 2016 - Cover2
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IEEE Power & Energy Magazine - May/June 2016 - Cover3
IEEE Power & Energy Magazine - May/June 2016 - Cover4
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