Uhv Power Transmission Project Transmission Line Design

As for the design of ultra high voltage(UHV) transmission lines, the choice of conductors is one of the main problems. It is important that research influence of UHV transmission lines electromagnetic environment. It is important to analyze the influence by the electromagnetic environment to line.Firstly, according to the transmission capability of UHV,the burden characteristic and the produce and circulation of line in domestic and international, six kinds of line type are selected. They are researched principle that is to decrease the surface electric field intensity of line. The first step is to define the types that are included: 6×JL/G1A-900,7×LGJ-800/55,7×ACSR-720/50,8×LGJ-630/45,9×LGJ-500/35,10×LGJ-400/35, Because of the characteristic of the electric and the next distance of line, abruption distance of line is reasonable selected. Then the best line combination is defined from the influence of electromagnetic environment through analyzing the number of abruption,the area of line,the distance of abruption,the distance between of the line,the surface electric field intensity of line,the electric field intensity of ground,radio inference(RI) and the influence of audible noise(AN), by using the SES-Enviro mold in CDEGS soft of Canada SES company. At last by using the SES-Enviro mold, analyzing the characteristic of electromagnetic environment of the six kinds of line, calculating the surface electric field intensity of line,the distribution that is 1.5 meter to the ground,the radio inference and the influence of audible noise of the six kinds of line in the two kinds phase of plus and minus,the 8×LGJ-630/45 type line is defined in the design.