The electrical degradation of fiberglass poles

Abstract EN

This work involves fiberglass samples used in two kind of aging (45 days aging, 45 days aging with AC of 25 kV).

Five sets of fiberglass samples were used in the accelerated aging tests and each set consists of nine fiberglass samples.

The tested insulation length of these samples was chosen as 0.3 m.

Two metallic bands, upper and bottom, were used as electrodes and tightly wrapped on the samples.

The effect of surface condition on the materials electric degradation was studied and the nine samples were divided into' three group.

The external surfaces of the first group of tested samples were kept intact, but some scratches were manually placed on the external surfaces of the second group.

For the third group, five holes, each with 2.5 cm in diameter, were manually drilled in each sample.

The electric experimental using to identify the insulation strength of fiberglass materials were (the lighting impulse test, AC wet flashover tests and, AC dry flashover test).The result show that the CFO voltage and AC flashover under dry condition were higher than under wet condition for all samples.

The leakage current has a linear relationship with applied voltage.

The electric degradation is significant when the sample were tested with electric stress.