An investigation on characteristics of tracking failure in epoxy resin with harmonic and fractal dimension analysis

Abstract

Epoxy resins have excellent mechanical and electrical properties; thus, they are commonly preferred in the electrical-electronic sector as insulation materials. These insulation materials experience degradation such as breakdown, tracking, or treeing. Therefore, safety and reliability tests of insulation materials have great importance in estimating the performance of insulation. These tests must be carried out to decrease the risk of electrical insulation fault. In this study, the relationship between tracking failures and the data obtained during experiments was evaluated. Tracking failure performance of epoxy resin was investigated using the IEC 60112 test standard, which is known as the comparative tracking index test. Leakage current data, collected from the experimental setup recorded from a ground electrode, were decomposed by using the Fourier transform method. The 3rd, 5th, and 7th harmonic distortion components of the leakage current data were calculated and their relationship with the number of drops falling on the sample was interpreted. Then the harmonic distortion components relationship was explained under dirty and clean surface conditions. We explained the tracking pattern formed on the surfaces of the samples after completion of the experiments was decomposed using image processing techniques. The capacity, information, and correlation dimensions of the resulting tracking patterns were calculated using fractal dimension analysis. Shapes in the same terms were examined using fractal dimension analysis.

Application and Comparative Analysis of Fuzzy Inference System for Transformer Fault Diagnosis with Dissolved Gases in Oil

“…Electrical insulation on high voltage equipment plays an important role in the sustainability of electrical transmission systems. Failures in electrical insulation may occur in the interruption of electrical transmission and the malfunction of electrical devices [2]. Moreover, failures in transmission systems can create severe problems for all equipment on transmission systems and end-users.…”

Acompanhamento de microestrutura paramagnética fragilizante usando análise harmônica da tensão induzida

“…Quando um campo magnético é aplicado a um material ferromagnético, a indução magnética resultante tem forma distorcida devido à histerese magnética e a não linearidade da permeabilidade do material, ou seja, uma onda de forma senoidal aplicada, induz uma não senoidal. Esta forma de onda distorcida da indução magnética contém componentes nas frequências harmônicas do campo magnético aplicado [1]- [4].…”

“…O estudo das amplitudes dos harmônicos tem sido realizado para análise de tensões tratativas e compressivas em aços, degradação de materiais através de processos de corrosão, caracterização de falhas, sendo correlacionados com propriedades mecânicas e de corrosão, e indicados como parâmetro de ensaio não destrutivo [1]- [4].…”