Capacitive grading layers are specialized insulation components in high-voltage bushings that control electric field distribution to prevent dielectric breakdown.
Capacitive grading layers are concentric cylindrical or conical conductive layers embedded within the insulation of high-voltage bushings. They function as a series of capacitors connected in parallel with the main insulation, creating a controlled voltage gradient along the bushing's length. This prevents excessive electric field concentration at either end, which could cause partial discharges or complete insulation failure. These layers are typically made of conductive foil or metallized paper and are precisely spaced to achieve linear voltage distribution.
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Without grading layers, the electric field would concentrate at the ends of the bushing, exceeding the dielectric strength of the insulation and causing failure. The layers distribute voltage evenly.
Layer failure creates localized high electric stress, leading to partial discharges, insulation degradation, thermal runaway, and eventual bushing explosion.
No, damaged grading layers require complete bushing replacement as they are embedded within solid insulation during manufacturing.
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