Why 15 nos . disc insulator connect for 220kv o / h line ? Preceding contribs ) 08 : 45, 25 August 2008 ( UTC)
2.
However, these had a practical limit of 40 kV . In 1907, the invention of the disc insulator by Harold W . Buck of the Niagara Falls Power Corporation and Edward M . Hewlett of General Electric allowed practical insulators of any length to be constructed for higher voltages.
3.
Standard disc insulator units are in diameter and long, can support a load of 80-120 klbf ), have a dry flashover voltage of about 72 kV, and are rated at an operating voltage of 10-12 kV . However, the flashover voltage of a string is less than the sum of its component discs, because the electric field is not distributed evenly across the string but is strongest at the disc nearest to the conductor, which flashes over first.
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