Study of electromagnetic field exposure under transmission line by using finite element method

Lee, Zher Ye (2021) Study of electromagnetic field exposure under transmission line by using finite element method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Due to the evolution of the technology and industry, electricity has become more vital in human’s daily life. To fulfil the demand of electricity supply to residential and industry area, more and more transmission line have been built to transmit electrical energy from generating station to distribution units. However, studies have shown that transmission line emits electromagnetic radiation that bring negative impacts to human. Therefore, this report is aimed to study on electromagnetic field generated by transmission line at human height level. In order to study on the electric field, Comsol Multiphysics, a finite element based software has been used to simulate the electric field and magnetic field generated by transmission line. Finite element based simulation method is used in this project because analytical method is difficult to handle complex geometry engineering problem and practical measurement is time consuming and is more dangerous. The electric and magnetic field generated by transmission line is first computed and validated by comparing to previous studies. After the validation process, some parameters of transmission line including voltage of conductor, current carried by conductor, radius of conductor and horizontal phase spacing. The results shows that the electric field intensity increase while voltage of conductor increase, radius of conductor increase and horizontal phase spacing increase. Besides, magnetic field intensity increase when current in conductor increase and decrease while horizontal phase spacing increase. Radius of conductor has no impact on magnetic field intensity. For the generated transmission line model, voltage of 700kV above will exceed safety limit established by ICNIRP which is 50kV/m for residential exposure. Hence, a safety distance needed to be considered when planing the ROW of the transmission line.

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