03326nas|a2200433 i 4500 20260818113540.0 280101s2000 th uu m rtt 00| a1eng d .b11818712 AIT Thesis no. ET-00-8 Pham Van Thanh A feasibility study of energization overvoltage in a 500KV line : the case of Vietnam, 500 KV, Playcu - Phulam transmission line Bangkok : Asian Institute of Technology, 2000 88 leaves Thesis ; no. ET-00-8 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology Overvoltage may determine the insulation of various components of the transmission system. With the steady increase in transmission voltages, switching surges have become the governing factor in the design of insulation for EHV and UHV systems. Of major importance are the switching surges by line energization, which cause travelling waves on the transmission line the most severe at the end remote from the switching point. When energizing transmission line, severe overvoltage can be generated. This study is concerned with overvoltage due to switching energization. It is more important because this study applies to a new 500kV transmission line not only in insulation coordination (design) but also m operation. In this study, a statistical approach is used. The MATLAB program is used for the generation of random closing times. Statistical Calculation of Energization Overvoltage has been done by the PSCAD/EMTDC program. The reconunendation of IEC 71 was applied to the statistical analysis. The results show that the highest values of phase to ground and phase to phase overvoltage are l .68pu and 2.68pu respectively corresponding to closing times of 14 ms, l 2ms, l 6ms for phase A, B, C. The results agree with the regulation of EVN and standard insulation level IEC No71 for 500kV systems Electric lines Vietnam Overvoltages Surapong Chiraratananon, Chairperson Yu, Cun Yi, Co-Chairperson Dhadbanjan, Thukaram, Examination Committee Rajapakse, Athula, Examination Committee Swedish International Development Cooperation Agency (Sida), Scholarship Donor Asian Institute of Technology. Thesis ; no. ET-00-8 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06791 .b11818712 mnait u 240401 0 010128 m a u 2 mnait mnait mnarc 20 40 Barcode : 30050120749840 CREATED : 1999-08-31 RECORD # : i12233511 LPATRON : 1017543 LCHKIN : 2005-02-27 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 3 TOT RENEW : 3 Barcode : 30050120749832 CREATED : 1999-08-31 RECORD # : i12233523 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120347272 CREATED : 2016-06-15 RECORD # : i13038096 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 43656 43656 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. ET-00-8 30050120749840 2026-08-18 11:35:40 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. ET-00-8 30050120749832 2026-08-18 11:35:40 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. ET-00-8 30050120347272 2026-08-18 11:35:40 2026-08-18 40