The power transmission line is crucial to the energy system in the country. There is a strong emphasis on industry sectors. Engineers have a duty to protect and maintain power transmission lines systems. This research has brought the power transmission system of the Electricity Authority of Thailand to analyze the simulation results, proposes a set of mathematical models presenting magnetic fields caused by 115 kV power transmission line hung over a 22 kV for the operators working on the transmission 22 kV systems by using a set of second-order of PDE. The simulate conduct here in is based on the 3-D FEM in the time harmonic mode, MATLAB programming to show the effects of magnetic fields around power transmission lines and magnetic field distribution in staff to perform work. An investigate the magnetic fields acting on a human in comparative with ICNIRP standard.

This research presents a mathematical model of the electric field of a microwave oven. Which is expressed in the form of the second-order partial differential equation. Computer simulations were applied to the 3D finite element method developed with the MATLAB program and graphical results of the electric field values inside the microwave oven were used. In this research, a microwave oven operates at a frequency of 20 GHz. In the microwave oven, there is a waveguide called a magnetron. The Microwave will be blown by the fan to spread the waves throughout the oven. The vibrate causes food molecules when exposed to microwaves, causing heat. By dividing consideration into the placement of waveguide into 3 types: 1. Waveguide 1 side, 2. Waveguide 2 sides, and 3. Waveguide 3 sides.

Finite Element Analysis of Electric Field Distribution for 115-kV Underground Power Transmission Systems

This paper presents a mathematical model of the electromagnetic field. and the electromagnetic force of a DC brushless electric motor. The 3-D finite element method (3-D FEM) was applied to analyze the electromagnetic field. and electromagnetic forces in the design of DC brushless electric motors. In this research, the design of a three-phase, four-pole, 3-hp DC brushless electric motor is considered in two forms: 6 permanent magnets and 10 permanent magnets, but the magnetic properties and parameters. remain the same, and the results shown are the values of the magnetic field distributed along the motor cross-sectional area. This is explained by a graphical representation of the magnetic field distribution. To determine the electromagnetic load of a brushless motor in an analysis of the ideal DC brushless motor design.

This paper presents a mathematical model of the magnetic field in a pantograph for an electric train. This is shown in the form of a partial differential equation. Second, the computer simulation applied the three-dimensional finite element method (3-D FEM) developed by the MATLAB program and analyzed the material that can be used as a replacement for pantograph contact surfaces. In this research, a voltage of 25 kV and a frequency of 50 Hz were used to simulate the contact effect of a pantograph. There are compare 4 comparable materials in total: copper, aluminum, brass, and carbon steel. To find materials with electromagnetic diffusion to replace graphite materials.