Transients in Power Systems
Transients in Power Systems ECE 524
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This 6 page Class Notes was uploaded by Fredy Okuneva on Thursday October 22, 2015. The Class Notes belongs to ECE 524 at University of Idaho taught by Brian Johnson in Fall. Since its upload, it has received 21 views. For similar materials see /class/227723/ece-524-university-of-idaho in ELECTRICAL AND COMPUTER ENGINEERING at University of Idaho.
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Date Created: 10/22/15
61 39OU NOISSEIS SWELLSAS EBAOd NI SiNEJISNVEIi vzs 333 m Univergityofldaha p a Jig i Lav 9 ECE524 Session 18 Page 1321 Transients in Power Systems Spring 2008 General solution of wave equation a Bit m 5 0 D Alembert 8X2 K812 0 Solution F g x 3E Where K LC or CL 0 Then TIR Vii C v which is the propagation velocity 0 Also we can nd v L CM WUMi W L d1 g m U 1 Egg Spring 2008 o ThenF gxvt Distributed Parameter Line Model ECE524 Session 18 Page 1421 Transients in Power Systems Spring 2008 Propagation Velocity 0 Notice that for overhead lines L 2 H f lnj f Hm I I x 39 g Q And C gaff Fm r Ur 0 Using air as a dielectric 8 LL l f g 9 Then LC Huang K 57 080 t3 0 Therefore lv xLC ittoeo lc where c is the speed oflight c When the ground return is included then 8r gt 1 and u gt 1 and this does not hold a The same is true with cables as well 0 We also de ne the characteristic impedance as g 26 o For overhead lines 26 ranges from 3009 to 5009 o For underground cables ZC ranges from 30 to 80 Distributed Parameter Line Model Spring 2008 52 W m Universityofidahe ho Eat m Universityofldaho m Universityofldaho m m 3