Abstract
As an important index for measuring the operational economy of EHV AC transmission lines, corona loss (CL) is one of important factors worth considering during the operation and design of transmission lines. The 750-kV transmission lines are mainly distributed in high-altitude areas in northwestern China, where sand storm occurs frequently in spring and autumn. At present, a few researches are available on the evaluation of CL in multi-circuit transmission lines on the same tower in sandy and dusty area at high altitudes. Based on a transmission project with four-circuit transmission lines on the same tower in the north of Xi’an, Shaanxi Province, China, the electric field distributions of bundle conductors under two types of arrangement structure, including six and four cross-arms tower, were investigated. Then, by using the CL equivalent theory, the CL under meteorological conditions of fair, rainy, snowy, foggy, and dusty weather were evaluated. Finally, the optimal phase-sequence arrangement under the optimal tower modes was proposed, and the CL and resistance loss under the selected arrangements were compared.
Highlights
With the growing lack of land availability, transmission corridors are increasingly scarce, and the multi-circuit transmission lines on the same tower which can save land occupation with restricted corridors have become the trend for power grids
As an important part of the corona effect, corona loss (CL) is an important factor for measuring the operation economy and reliability of transmission lines
The CL evaluation of 750 kV AC four-circuit transmission lines on the same tower in dusty and sandy northwestern areas at high altitudes is an important link in the transmission design, lending significance to this research
Summary
With the growing lack of land availability, transmission corridors are increasingly scarce, and the multi-circuit transmission lines on the same tower which can save land occupation with restricted corridors have become the trend for power grids. The CL evaluation of 750 kV AC four-circuit transmission lines on the same tower in dusty and sandy northwestern areas at high altitudes is an important link in the transmission design, lending significance to this research. Anderson and Zaffanella [6], Anderson [7] investigated the variation in bundle conductor radius and CL data during the fair, foggy, and rainy weather. Kolcio et al [11] measured the CL data of bundle conductors in a 765 kV test line with different bundle spacings and sub-conductor radii in foggy and fair weather, which provided a good basis for the selection of conductors. Liu et al [13] designed a CL real-time monitoring system and investigated the UHV CL data of a single-circuit test line with bundle conductors (8×LGJ–500/35) under heavy rainy conditions, and the coefficients of surface roughness at various rainfall rates were estimated. Liu et al [14] developed a sand storm simulation system and measured the corona resistive currents of bundle conductors in a 750-kV
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