A METHOD OF TESTING THE INTEGRETY OF A SECOND SEAL OF AN ELECTRICAL INSULATOR

摘要

An insulator for separating two objects with different electrical potential, the insulator comprises; an insulating body (8) enclosing a first volume (10) for housing a gas, the body is provided with an opening, a sealing arrangement (1) arranged to seal said opening in the body and comprising; a first sealing element (3) for sealing said opening and provided with a first closable opening (5). The sealing arrangement (1) further comprises; a second sealing element (2) for sealing said opening, and arranged inside the first sealing element (3) so that first and second sealing element define a second volume (11) significantly smaller than the first volume (10), the second sealing element is provided with a second closable opening (4) which in cooperation with the first closable opening (5) enable control of the gas pressure in the first volume (10).