By V. N. Maller
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Extra resources for Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum
25 mm diameter point anode and a plane cathode and observed that the break down voltage increased with gas pressure to a maximum value at a pressure p = 6 bar. Above this pressure p there exists a regime of decreasing breakdown voltage with increasing pressure until a critical pressure p c is reached. At pressures above p c , there is a slow increase of breakdown voltage with pressure. Similar results have been obtained by several other workers [15,16]. This anomalous pressure effect was observed only in electronegative gases and was absent in non-attaching gases like nitrogen.
7) Empirical Equations for E^ for Different Electrode Geometries  High Voltage Breakdown in SF6 Gas 42 Advances in High Voltage Insulation Empirical Estimation of Breakdown Voltages in Practical Systems It is not always possible to use breakdown voltages measured for specific electrode geometries to be used in the design of dimensions of SFfi insulated systems, which normally represent a variety of elec trode configurations. For such electrode configurations, various empirical formulae have been derived  to estimate the field factor and these have to be used in the design and testing of such apparatus for their performance.
Results 0 thus obtained for an ideally flat electrode surface R = 150 ym ar e shown in Fig. 26 along with the (R max = 0 ) a n d f o r 60]. From this experimental data of M t t a at aZ. [ seen that for p < 6 bar the agreement is good. figure, it may be Cooke  has suggested that the breakdown voltage decreases when the product p R exceeds 80 bar ym. Detailed investigations have also been carried out to understand the effect of the shape and Advances in High Voltage Insulation 56 R max. = 0 400 R m a x .