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In this paper, a set of accelerate thermal ageing experiments on oil immersed insulation paper were performed under 110□ and lasted for more than 100 days. The degree of polymerization (DP), the frequency domain spectroscopy (FDS) and water concentration in insulating oil and paper, as well as the AC breakdown voltage of insulation paper were tested and analyzed. The results indicate that the dielectric...
A thermally accelerated aging experiment was designed for simulating the actual environment of transformer insulation in service. Pulse current method was used to measure partial discharge of the test samples with different aging degrees. Four PD spectrums of PRPD model and its 29 features were extracted for aging condition assessment. Aging condition of oil-paper was defined and normalized into a...
In order to analysis the influence of copper ion on aging rate of oil-paper insulation, accelerate thermal aging experiments have been designed and performed on oil-paper insulation at two aging temperatures. A number of characteristic parameters such as dissolved gases, degree of polymerization, furfural content, water content and Acid number of oil have been tested periodically. The experiments...
The degradation of transformer oil-paper insulation is decided by the chemical and physical processes in oil-paper insulation. The thermal aging plays the main role in the electrical and thermal degradation. In order to study aging mechanism of oil-paper insulation, accelerated thermal aging experiments in laboratory were performed. Four types of oil paper compounds, which are composed by regular...
In this paper, in order to analysis the nanostructures varieties and ageing mechanism of power transformer insulation paper under electrical and thermal stresses, both Atomic Force Microscope and MS 4.0 software were used to analysis the microscopic figure variation of insulation paper during thermal and electrical ageing. The results indicate that in some parts, paper sample was punctured because...
In order to analyze the thermal aging mechanism of the insulation paper inside the power transformer, a series of accelerated thermal aging tests were performed on pressboard. Subsequently, the atomic force microscope (AFM) together with scanning electron microscope (SEM) and X-ray diffraction (X-RD) were utilized to observe the micro surface of the thermal-aged pressboard. The experiments and analysis...
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