What Happens To An Insulator When It Is Struck By Lightning?

A high-intensity instantaneous current rapidly forms an arc path along the surface of the composite tension insulator umbrella skirt, accompanied by a strong thermal shock. The lightning strike causes a sudden increase in the electric field on the surface of the high voltage transmission line insulators umbrella skirt or between the umbrella skirt and the metal fittings, forming an arc path along the overhead power line insulators outer shell. Local materials expand due to heat and the structure degrades. The tension insulator umbrella skirt rubber or composite material cracks rapidly.