IEEE Power & Energy Magazine - May/June 2018 - 94

figure 13. A schematic of a bushing potential device. (From Westinghouse
Descriptive Bulletin 33-357, Aug. 1955.)

Oil

Year Voltage
1934
287
1941
287
1945
138
1947
230
1949
138
1951
161
1954
330
1960 245/362

MVA
2,500
3,500
3,500
10,000
6,000
10,000
25,000

kA
5
7
15
25
25
36
44
63

figure 14. The escalation of OCB ratings by years.

also provides support for the interrupters that are bridged by the cross arm
connected to the operating mechanism
via the insulated lift rod. the current
transformers for protective relaying
and metering are mounted around
the bushings. Bushings construction
consists of the conductor, which is
wrapped with alternate layers of oilimpregnated kraft paper and metallic

figure 15. A 69-kV frame-mounted OCB. (From Westinghouse Descriptive Bulletin 33-252, Jan. 1961.)
94

ieee power & energy magazine

figure 16. A 132-kV three-phase
breaker with individual phase units
nonskid mounted. (Used by permission of the authors.)

foil to provide a capacitance grading
of the voltage to ground. a capacitance
tap at the second layer of foil is used
to provide a low voltage for operating a
potential device for relaying. FigureĀ 13
shows a schematic of the bushing potential device.

A Progression of Voltages
and Interrupting Currents
the progression of system voltages and
interrupting currents is shown in Figure 14. It was deemed necessary to form
classes of oil breakers by rating such
as subtransmission 15-69 kV and transmission class 121-242 kV, with 345 kV
called extra high voltage. the 69-kV rating had frame-mounted circuit breakers,
as shown in Figure 15. In this design, the
pole unit tanks are supported by a frame
with the tanks being lowered for maintenance work. at the higher voltages,
the pole unit tanks were mounted separately on a foundation or on steel beams,
as shown in Figures 16 and 17. When oil
breakers were popular, there was a
may/june 2018



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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