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Engineering · Electrical Engineering
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Example 5 U 220 kV voltage is applied to single core cable with conductor cross section of 350 mm2. The geometrical characteristic of the cable is p 2,5, and the dielectric constant of the oil insulator used in the cableis 2,2. In this cable; a) Calculate the maximum field strength. b) If the conductive surface is covered by a solid insulator with a relative dielectric constant Er25 with a thickness of 0.5 cm for reducing the maximum electric field in the oil layer, what is the largest field strength in the oil layer? (External radius remains fixed.) c) Calculate the least puncture resistance to avoid penetrating the solid insulating material coated on the conductive surface,
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