Measurement and simulation of the electric field of high voltage suspension insulators

Abstract

SUMMARYIn this study, a method for the calculation of the electric field on high voltage insulators is presented. A model of the insulator string was set up using OPERA, an electromagnetic analysis program based on the Finite Element Method. In order to validate the accuracy of the method, simulated results have been compared with experimental results.

Environmental Effects on HV Dielectric Materials and Related Sensing Technologies

“…Life prediction tools were proposed to estimate the age profile of HV cables and insulators based on low-level radiation, flashover voltage, and surface resistance [15,63]. The majority of studies have been concerned with electrical activities only around one insulator to quantify the power losses and electric field around the insulator [64][65][66][67][68].…”

Dynamic model to predict the characteristics of the electric arc around a polluted insulator

“…In addition, the FEM is a powerful method for providing precise solutions to the electrical potential problems associated with HV insulation [15][16][17]. The voltage and distribution of the electric field for different types of ceramic disc insulators were studied in [18] using two-dimensional (2D) and 3D FEM [19] software.…”

Analysis of Capacitance to Ground Formulas for Different High-Voltage Electrodes

“…The effect of the stray capacitance is to reduce the efficacy of each additional insulator unit due to the non-linear voltage distribution [6]. This is because the capacitive current and the corresponding voltage drop across each insulator unit are greater in the insulator units closer to the conductors, due to the effect of the distributed stray capacitances to ground [7]. The string elements closer to the line are subjected to a higher electrical stress than those closer to the tower.…”

“…The calculation of the capacitance of conductive objects which are close to ground leads to challenging mathematical problems, even for simple geometries. Therefore, analytical solutions for capacitance only exist for a limited number of electrode geometries and configurations, which have almost no practical applications [11], and often only contemplate the stray capacitance to ground, thus disregarding the effects of nearby grounded electrodes, structures or walls [3].As a consequence, computational methods are increasingly being applied to solve such problem, although most of the published works deal with very particular problems, such as insulator strings [4,5,7], transformer windings [10] or voltage dividers [12], among others. FEM is perhaps the most applied computational technique to calculate the effects of capacitance, since it allows dealing with complex three-dimensional geometries, as reflected in several works [13][14][15][16][17][18][19].Since stray capacitances are not easily measurable, because of the low immunity to noise of the small signal to be acquired [20], results provided by numerical methods are a good alternative during the design stage of high-voltage devices and instruments.…”

“…As a consequence, computational methods are increasingly being applied to solve such problem, although most of the published works deal with very particular problems, such as insulator strings [4,5,7], transformer windings [10] or voltage dividers [12], among others. FEM is perhaps the most applied computational technique to calculate the effects of capacitance, since it allows dealing with complex three-dimensional geometries, as reflected in several works [13][14][15][16][17][18][19].…”