Authors
Abstract
The critical flashover CFO of an insulation structure is commonly used to
describe the insulation structure lightening impulse strength. In this work,
first CFO of polymer and porcelain each alone was measured and then, a new
structural arrangement is represented to measure (CFO). This arrangements
consists of three layers; fiberglass is placed between two layers of polymer and
porcelain .All insulation materials are examined in dry and wet condition with
positive and negative lightening impulse under (15,25 and 35) KV. The critical
flashover voltage (CFO) of insulator is distributed on certain surface along
with fiberglass distribution poles as an insulator. Also altitude of poles is
taken into consideration in calculating critical flashover voltage for both
insulator and structure. (CFO) voltages are added from fiberglass
distribution pole to basic insulation component and are calculated based on
the test result of the (CFO). The above measurements indicated that the total
CFO voltage of new arrangements insulator under dry condition is much
higher than under wet condition for the same impulse polarity and tested pole
length.
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