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Corona: Silent But Deadliest Enemy for Composite Insulation

Corona leads to insulation failure.That much has long been known.However,key aspects of the problem are still not fully understood and being researched even today.These include the magnitude and duration of corona that will initiate degradation,the most suitable detection methods and the development of meaningful accelerated test to predict service performance in its presence.

Corona is the halo or circle of light seen around the sun during a full eclipse.Electrical engineers borrowed the term to describe the glow around a conductor subjected to sufficiently high voltage.The glow is caused by ionization of gas and subsequent release of light when electrons that have gained energy from the electric field revert to their original stable state.Since the dischage dose not bridge the entire space between the electrodes,corona is sometimes also referred to as partial discharge.The reason the glowing is localized only around the source is that the insulation provides a barrier to further ionization while the electric field,which decays rapidly with increasing distance from the source,is unable to sustain the ionization.

When it comes to composite insulators ,corona activity can originate from the hardware,voids within the material or from defects in the interfaces.Most of the light produced by such corona has a wavelength shorter than 400nm and therefore falls in the UV range.By contrast,most solar radiation is in the visible range (400-700nm),the shorter wavelength being filtered by the earth's ozone layer.In fact,some peaks in the UV region of the corona spectrum match or exceed those in the solar spectrum.Polymeric materials are more susceptible to degradation from UV produced by corona than from solar radation,especially of the corona is close to the material.

From:Journal INMR

 
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