Question

. A single core concentric cable 6 km long has a capacitance of 0.22 ut per km, the relative permittivity of the dielectric being 3.0. The diameter of the inner conductor is 1.4 cm and the supply voltage is 69 kV at 60 Hz. Calculate the outer diameter of the cable, the voltage gradient at the surface of the inner conductor and the charging current

Answer 1

single con cable 6km long C: 0.22 UF/kom E3 1.4 (m v. 69 kv f -60Hz ca 211€o Er bi (²4) 20€. Er 217X8.854x10 x3 0.22x109 In (PDF 0.758 Ph2.134 R = 2.184x 1.4 9.987 R is the outer diameter 2 2967 cm il vollage goodent new

E = 69x103 1. uxlm (2 957) E = 2840 KW 694103 1.485 = 46.46 kv/cm al charging current IC= v. 21.f. c 3 911 X 60 X 0.22 x 10 = 3.722 A/cm total charging curent = 3.722x 6 = 34.33 Amps