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Hickam(1) has shown that at extremely low pressures (10−4–10−5 mm) the electron capture curve of SF5 is dependent on the temperature at which the experiment is conducted. Experiments were performed to see if there was a temperature effect on the breakdown of SF5. In non-uniform fields, the positive direct voltage for breakdown in SF5 as a function of pressure goes through a maximum. The reason for...
As shown in Figure 1, the positive impulse breakdown voltage of SF6 in non-uniform fields can be lower than the positive direct voltage breakdown over a pressure region. Also, in this pressure region, the positive direct voltage required for breakdown goes through a maximum. It is believed that these two characteristics (impulse ratio <1; a maximum in the direct voltage vs. pressure curve) are...
The negative corona extinction voltage or breakdown extinction voltage has been determined in air and SF6 at atmospheric pressure for the sphere to plane configuration. Spheres or points ranging in size from a 0.250″ radius sphere to a 0.0024″ radius phonograph needle were used with gaps of the order of 1–10 millimeters. The negative corona extinction voltage was also determined for the coaxial cylinder...
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