Composite Insulator service life can be affected by electrical, mechanical and environmental stresses. The greatest physical threats are generally mechanical loads, UV exposure and vandalism. Airborne contamination can also be a serious problem, as it leads to electrical discharge (also called leakage distance). Atmospheric contamination and moisture can form a conductive film, leading to leakage current, dry band arcing and eventually flashover, which is a fault to ground over the composite insulators.
creepage distance drawing
Leakage currents increase as the material’s surface loses its hydrophobicity and surface resistance over time, which happens in several ways. Ceramic glaze can be eroded by windblown sand and dirt, whereas resilient polymer surfaces are less susceptible to erosion from such abrasive particles.
Leakage distance is also called creepage distance, which is one main of composite insulator technical parameters.
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