Abstract
This paper presents research results of the loss factor of high voltage insulation samples made of aramid paper impregnated with various types of insulating oil. The analysis was carried out in the high frequency domain in the range of 50 Hz to 1 MHz. The experiments were carried out for three impregnation types: mineral oil, synthetic ester and natural ester. The influence of temperature in the range of 20 °C to 100 °C, which is typical when using this type of insulation in power transformers, was taken into account. In addition, the process of influence of initial aging of aramid paper was simulated by heat soaking the samples before their impregnation at a temperature of 250 °C in multiple time intervals. Based on the analyses of dispersion characteristics of insulation sample loss factors, conclusions and recommendations for further diagnostics of aramid-oil insulations using the method described were delineated.
Highlights
Present legal and economic situations make the owners of power networks take intensive steps to decrease operation costs and the risk of damage to the natural environment due to failure of the facilities used
This paper presents research on the influence of impregnation type of the aramid paper samples on dispersion characteristics of the loss factor in the high frequency domain
We should focus on the analysis of the polarization maximum of the aramid paper fibers which is strictly correlated with the temperature of the insulation under study
Summary
Present legal and economic situations make the owners of power networks take intensive steps to decrease operation costs and the risk of damage to the natural environment due to failure of the facilities used. The process of departing from using only mineral oils in favor of more ecological synthetic and natural esters can already be observed, even in the case of classical cellulose insulation in new power transformers [13,14] Such a situation is imposed on one hand by more and more restrictive provisions pertaining to natural environment protection and the reduction of the use of petroleum products and on the other hand better electrical and physicochemical parameters of new esters [3,4,15,16]. It was initially assumed that the thermal degradation of aramid fibers influences the polarization mechanisms in the high frequency domain
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