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METHOD OF AND APPARATUS FOR VOLTAGE TESTING OF HIGH-VOLTAGE EQUIPMENT AND ELECTRICAL MACHINES

  • US 3,775,686 A
  • Filed: 05/24/1972
  • Issued: 11/27/1973
  • Est. Priority Date: 06/15/1971
  • Status: Expired due to Term
First Claim
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1. In the method of testing the strength of insulation of critical parts of electrical equipment and electrical machines at test voltages higher then those to which the insulation is subjected during normal operation the improvement comprising the steps of temporarily enclosing the critical insulated parts to be tested within a gas-tight envelope made from flexible transparent material, filling out said envelope with an electronegative gas or gas-air mixture to a pressure slightly in excess of atmospheric thereby to enhance the environmental conditions for the test thereafter applying the test, thereafter applying the test voltage to the critical insulated part and then removing the envelope.

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