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BURNDY
®
Substation — Welded/EHV
US: 1-800-346-4175
www.burndy.com
Canada: 1-800-387-6487
Blue highlighted items are industry standard and most frequently ordered.
M-7
NOMOGRAM FOR FINDING
THE AVERAGE
CONDUCTOR-SURFACE
VOLTAGE-GRADIENT
FROM LINE DIMENSIONS
AND VOLTAGE.
Example: For a 30 ft. high single phase
bus* of 4" diameter, V/E = 30. At 450 kV
to ground the average conductor-sur-
face voltage-gradient is 15 kV RMS/CM.
* For the equivalent single phase height
(he) of a 3 phase bus arrangement see
page 5.
Ea = ________
r 1n —2h
r
V