What's the difference between Corona ring & grading rings? Can insulator have both Corona as well as grading ring? Or it depends on the system voltage level whther Corona ring or garding ring will be provided on the insulator?
"No-one gets an ironclad guarantee of success. Certainly, factors like opportunity, luck and timing are important. But the backbone of success is usually found in old-fashioned, basic concepts like hard work, determination, good planning and perseverance" -- Mia Hamm