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As the important part of the transformer insulating, the insulation performance of oil-paper directly affects the security and stable operation of the transformer. In order to study the influence of temperature and thermal aging on the breakdown voltage of oil-paper insulation, breakdown voltage test of transformer's oil-paper was carried out, and breakdown voltages of oil-paper insulation were obtained...
The converter transformer is one of the most critical equipment in high-voltage direct current (HVDC) transmission systems. Valve-side windings withstand complex stresses combined with AC, DC, and pulse voltages. Oil-paper insulation is used within most of HVDC converter transformers. Partial discharge (PD) in oil-paper insulation is a major reason for the development of internal faults in HVDC converter...
With the improvement of voltage level of HVDC transmission, the insulation of converter transformer has become increasingly prominent. Different from the general power transformer, valve side windings on converter transformer withstand pulsating voltages, which makes insulation problem get more serious. In this paper, experiments were carried out under pulsating voltage over a wide range of the pulsating...
The glass transition temperature in amorphous region of insulation paper is one of the most important characteristics for its thermal stability. In order to study the microscopic mechanism of the glass transition process for transformer insulation paper which may provide some information for thermal aging, molecular dynamic simulations has been performed on two micro-structural models: pure amorphous...
Oil-immersed transformers are key components in power systems. The inordinate temperature rise in oil-immersed transformers, featured by hot-spot temperature (HST), accelerates thermal degradation in insulation. This phenomenon may result in reduction of service age or thermal breakdowns of transformers. HST is also an important parameter to determine the optimum load ability of transformers. A procedure...
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