Glaze grows on the conductor surface will affect its corona onset voltage (COV). The fact that wires are iced under voltage is often ignored and the scaled models are always adopted to study actual bundle conductors, even there is no lights have been thrown into falling rule of COV after energized icing. AC corona tests of bundle conductors after icing are implemented in the Multifunction Climate Chamber while the UV imaging camera and I-U curve fitting are applied to measure and analyze COV T'he finite element models are established to research how glaze icicles affect electric field of conductor surface.
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