Analysis of Ecological Environment for 500kV Four Circuits Power Transmission Lines on Same Tower

In this paper, we introduce the ecological influence of transmission line and discuss the electromagnetic field of 500kV four circuits transmission lines (FCTL) on same tower as well as its ecological environment effect. The paper describes the conventional equivalence charge method (ECM) and presents its disadvantages. Based on this, we propose the two dimensional finite elemental model for the electromagnetic field of 500kV FCTL on same tower, calculated results indicate that the proposed method is simple and precise to analyze the electromagnetic field intensity of 500kV FCTL on same tower. Via the calculation, we conclude that the whole converse phase sequence of 500kV FCTL on same tower can decrease its ecological environment effect obviously. The proposed method in this paper and the analysis results of the paper will contribute to transmission line plan.