Simulation of 33kV String Insulators Using Finite Element Method (FEM)

Ceramic insulators consists of glass and porcelain are the traditional insulator that have been used until today in electrical power transmission line. These insulators are the most significant part as electrical insulation that prevents electrical current flow directly to the ground through the transmission tower or pole. However, there are a few stresses that interrupt the systems. Thus, knowledge of about voltage and electric-field in insulators are needed to maintain transmission or distribution grid performance and to ensure the consistency of optimal output power levels delivered to the consumers. An attempt has been made to simulate the voltage and electric field distribution of 33 kV porcelain insulators using finite element method (FEM). Based on simulation results, it is found that the bottom part (pin) of the insulator is the most sensitive area of electric stress. Meanwhile, the electric field and voltage distribution is decreased when moving towards cross arm.