Abstract

The Transmission Department requested the Research Center to evaluate 115 kV and 230 kV Polymer insulators. Samples of these insulators from four manufacturers were submitted for the test program. Representative samples of each type submitted were evaluated for RIV, tensile strength;. fiberglass rod porosity, rod to rubber adhesion, and flamability. Samples of 230 kV field aged insulators from one manufacturer were also submitted and were included in the RIV and tensile strength portions of the test program. The samples from all manufacturers performed similarly for rod porosity and flamability. Since one manufacturer makes no effort to bond the rubber to the rod, his adhesion was very low compared to the other three with similar bonding strength. The tensile strength and RIV test results varied between manufacturers and designs. The field aged 230 kV insulators were shown to have a significant RIV level at normal operating voltage. However, the addition of a corona ring reduced the RIV to an acceptable level.

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