Insulator – the tubular steel is at high voltage while the I-beam at the bottom is at ground potential.
Insulators make sure the energized parts do not touch the ground. All substation equipment in contact with an energized line or bus employs an insulator.
If you are interested in porcelain insulator,please view the website of changsha rich group,www.hncmec.com,which is a production base of porcelain insulator in china,started from 1240.
Add: Rich BLDG Shaoshan Nan Ave Changsha city Hunan province China