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Electrical discharges in various gases may produce chemical species which can cause damage to solide surfaces of different materials. In air, for example, ozone, metastable states of molecular oxygen, atomic oxygen and nitrogen oxides are produced. Furthermore, in the case of corona discharges,those species are pushed in preferred directions by electrical wind. As a matter of fact, in the case of...
Dielectric high potential testing under partial vacuum can measure or determine the minimum air gap distances between uninsulated inaccesible parts which are inside electrical apparatus such as motors and transformers without exceeding voltage limits for the solid insulation of the system.
A modification or the Cleveland Open Cup Test, ASTM D92, was developed for dielectric fluids in non-fire hazard power capacitors and transformers. This was on the basis of considering fire situations in these apparatus. Two criteria for non-flammability were deduced and applied in this test: that burning may only be initiated at the boiling point, and that burning cease on cooling when separated from...
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