Relation Between Chalking of HTV and Decay-Like Aging of FRP in Composite Insulators

In recent years, the reliability of transmission lines is seriously affected by decay-like aging in composite insulators. Interface discharges and chalking of silicon rubber housing are often found in decay-like aged insulators. However, the relation between HTV chalking and decay-like aging is still unclear. In this paper, an artificial accelerated aging platform based on interface discharge was constructed to reproduce chalking and decay-like aging in composite insulators, and to investigative the effect of HTV chalking on core rod decay-like aging. The experiment provided acidic and high temperature conditions through interface discharge in a high humidity environment, the CT structure, leakage current, and physicochemical properties of core rod are characterized. The experimental results show that the housing filling behavior can exacerbate surface aging of core rods, ATH filling can slow down the aging of core rods during long-term aging. The ability of silicone rubber housing to resist tracking still has a positive effect on reducing core rod decay-like aging. This study provides a laboratory basis for chalking and decay-like aging.