(©) A sample of impregnated paper (Er = 3.5) of thickness 2 mm is placed between large parallel-plate electrodes. A cubi

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A Sample Of Impregnated Paper Er 3 5 Of Thickness 2 Mm Is Placed Between Large Parallel Plate Electrodes A Cubi 1 (370.54 KiB) Viewed 42 times

(©) A sample of impregnated paper (Er = 3.5) of thickness 2 mm is placed between large parallel-plate electrodes. A cubical air-filled cavity with 2 x 2 mm length of its edges and 0.05 mm deep, with its axis at right angles to the electrodes is located in the centre of the dielectric. A sinusoidal alternating voltage is applied between the electrodes. The breakdown voltage of air at different pd levels is shown in Figure Q5 i) ii) Determine the discharge inception stress in kV/mm in the dielectric for a pressure of 500 mm Hg. (6 marks) Calculate the apparent discharge magnitude. (4 marks) If the pressure in the void is doubled, determine the new inception voltage. (3 marks) iii)