LIGHTNING INDUCED VOLTAGES ON POWER LINES: THEORY
(1984)Abstract
Theory is presented wliich shows that nearby
1 ightning return strokes can induce voltage surges of
either positive or negative polarity on an overhead
line depending on the location of the lightning relative
to the line. The Telegraphers' Equations are
solved with the return stroke vertical and horizontal
electric fields as forcing functions. The horizontal
electric fields are calculated from measured or assumed
vertical fields anrl assume<! earth con(!uctivi ties. For
a typical return stroke, voltage waveforms are presented
for a line of 500 m length and one of 5 km
l enqth fur the full
2
owi ng conrli ti on s~ earth conductivities
between io- mhos/m and 10- mhos/m, earth
permittivities between £ = 15 and£ = 3, and
lightning ground strike ixfints between o. km and 5.0
km of the line at a variety of positions around the
line. Measured voltages on a 460 m test line described
in a companion paper are coMpared 1~ith calculated
voltage wave forms derived from measured vertical
electric fields, in accordance with the developed
theory. Calculated waveshapes are found to be in
moderately good agreement with the ineasurements, but
calculated magnitudes are about a factor of 4 lower
than measured. Possible errors in both theory and
measurement are discussed. Voltage measurements
reported by other investigators are, in general,
consistent with the present theory
Links and resources
Tags
community
@chkokalis's tags highlighted