Effects of Un-transposed UHV Transmission Line on Fault Analysis of Power Systems

• Published in: Transactions of Tianjin University Vol. 14; no. 3; pp. 231 - 234
• Main Author: 王安宁 陈青 周占平
• Format: Journal Article
• Language: English
• Published: Heidelberg Tianjin University 01.06.2008; School of Electrical Engineering, Shandong University, Jinan 250061, China
• Subjects: Engineering; Humanities and Social Sciences; Mechanical Engineering; multidisciplinary; Science; 故障分析; 故障计算; 电力系统; 超高压传输线; EMTPE; fault calculation; un-transposed UHV transmission line; simulation
• ISSN: 1006-4982; 1995-8196
• DOI: 10.1007/s12209-008-0042-6

The conventional fault analysis method based on symmetrical components supposes that the three-phase parameters of un-transposed transmission line are symmetrical in case of fault. The errors caused by the method with the symmetrical distributed parameter circuit model as the equivalent circuit of the un-transposed ultra high voltage（UHV） transmission line were studied under both normal operation and fault,and the corresponding problems arising were pointed out. By contrast with electromagnetic transient and power electronics（EMTPE） simulation results with the asymmetrical distributed parameter circuit model of un-transposed line, it is shown that the conventional method cannot show the existence of negative and zero sequences before fault happening and there are many errors on voltage and current after fault happening which are different with fault types. The error ranges of voltage and current are 2.13%— -81.13% and -7.82%— -86.15%, respectively.