Read e-book online Advances in High Voltage Insulation and Arc Interruption in PDF

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By V. N. Maller

ISBN-10: 0080247261

ISBN-13: 9780080247267

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Extra resources for Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum

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Seen that for p < 6 bar the agreement is good. figure, it may be Cooke [24] 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 . : 1 5 0 wm ^ 300 i E o > % o 200 _E o LU THEORETICAL 100 EXPERIMENTAL 0 0 2 4 6 8 Pressure (bars) Fig. 26 Macroscopic breakdown threshold field strength in SF [6]. size of the protrusion and gas pressure on the breakdown strength of SFfi gas and the experimental observations were found to support the theoretical findings [64-66].

67 x 10° V/m. At an electrode spacing ofg50 mm, the calculated critical breakdown voltage is 59 kV(rms) and this agrees reasonably with the experimental value of 53 kV(rms). c. breakdown of compressed SFfi gas. Doepken [49] obtained an equation for the motion of free conducting particles of small diameter while Cookson e£ al. [50] obtained similar equations for bigger particles. The equation of motion was then solved by time iterations on a digital computer to find the charge of the particle, the maximum height reached, the time of flight and the return velocity for each excursion.

39) ^ max ^ L v o/p'max J where, R is the maximum roughness height which in the model of Fig. 2mawill be equal to p and (E , ) is the maximum threshold microscopic field at the high voltagepeiectrode. 25 shows the results of his calculations. It can be seen from this figure that the surface roughness has no effect on the breakdown field when, p. 40) M ^ max A comparison with the experimental data showed a reasonably good agreement [64,65]. 5 bar. For these data, the maximum High Voltage Breakdown in SF6 Gas Z - AXIS I T Rmaxl 77777777p77777777, Fig.

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Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum by V. N. Maller

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