An overpotential test for insulators

Some of the factors met in the design of insulators and characteristics of routine electrical tests are discussed in this paper. A new overpotential test is described with its application and effects. Results of this test make possible a higher standard of practise in the manufacture and use of transmission line insulators. Ever increasing responsibility is being placed upon transmission line insulators. To establish by specific tests that each insulator put into service has a liberal initial factor of safety and further to be assured that the insulator will be proof against deterioration in service is the ideal toward which we are working.