Abstract
500kV transmission line from UHP put into operation, has gradually become the backbone of China’s electric power system network. At the same time, higher voltage applied research projects are carried out with great fanfare. Because of the increased voltage power transmission, high-power transmission is possible. However EHV transmission lines will have the operation of electromagnetic radiation, making transmission lines around the electromagnetic environment exacerbated the deterioration of the health of the residents around and pose a threat to security equipment. This article on the 500 kV transmission line electromagnetic EHV exchanged of environmental issues were studied.
Transmission line electromagnetic environment parameters include frequency electric field, the frequency magnetic field, radio interference and noise audible in four aspects. In this paper, Canada SES company produced the package of exchange CDEGS EHV transmission lines on the four areas carried out a detailed simulation study. For each electromagnetic environment parameters, introduced its theoretical calculation methods, the main factor reducing measures and related standards. This article focuses on the EHV transmission lines in the lower-frequency electromagnetic fields, raised EHV transmission lines in the bottom line and the erection of shielding low-voltage transmission lines erected to reduce the transmission lines below the frequency of the electromagnetic field methods, and the relevant simulation, simulation The results showed that: in phase with the ground wire between the lines or install shielding in the few EHV transmission lines below the low-voltage lines such as the erection of 220 kV transmission line can be significantly reduced transmission lines the bottom of the electromagnetic field. Listen to radio interference and noise, the current domestic and international lines through EHV test results are less than limits. Split the root of wire and a few cross-sectional area of radio interference and a greater impact on the audible noise, you can split the increased numbers and increased cross-sectional area of wire to further reduce the EHV radio interference and audible noise levels.