IEEE Power & Energy Magazine - May/June 2016 - 92

Teflon Chamber

Holes

Stationary
Contact
SF6 Flow

Moving
Contact

figure 4. A diagram of the "swiss cheese" interrupter. (Drawing courtesy of the authors.)

so to determine a limit, we blocked the flow completely to
breaks 2 and 3 and tested break 1 with the maximum interrupting effort possible. As a result of these early tests, the silver
tungsten arc contact material was changed to copper tungsten
because of its less reactive arcing-decomposition products. We
were able to interrupt symmetrical currents in the 30-40 kA
range, but too many current zeroes were passed up, and the
interrupting times exceeded the three-cycle limit. This was the
best the design could do as configured, and it wasn't satisfactory. Where could we go from there?

Final Interrupter Design

Transformer
bags

A close examination of the current interrupting test data on
the 230-kV breaker revealed an anomaly-sometimes the current was interrupted at an early current zero before the moving contact had cleared the nozzle constriction. As shown in
Figure 2, there was a 1.0 in (2.54 cm) hole in the center of the

reefindustries.com
1.800.231.6074

substation liners

Teflon Chamber

Stationary
Contact

Slot

SF6 Flow
Moving
Contact

figure 5. A diagram of the "slot" interrupter. (Drawing courtesy of the authors.)


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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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