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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 insulating performance of transformer oil is vulnerable to metallic particles, especially oil used in HVDC converter transformers. The electric field distribution in converter transformer insulating oil is different from that in traditional AC transformer insulating oil, so extra attention should be paid to the influence of metallic particles on its breakdown voltage. This paper investigated the...
This paper presented the improved failure model by experimental and analysis results on electrical breakdown characteristics of oil-paper insulation at pulsating DC voltages. The time-to-breakdown of oil-paper specimens were measured by using constant-stress tests. The improved failure model was established and calculated by the parameters of Weibull model and the improved competing risk algorithm...
Vegetable insulating oils are fire-resistant and environment-friendly liquid dielectrics. In recent years, magnetic nanoparticle has been used to enhance the breakdown strength of insulating oil. This paper presents the relationship of the solved water content in insulating vegetable oil-based nanofluids with time variation. The influence of solved water content on the electrical properties of insulating...
The insulation of windings connected with converter valves have to withstand AC, DC and repetitive impulse combined voltages in converter transformers. This paper presented the failure evaluation model by experimental research on electrical breakdown characteristics of oil-paper insulation under AC, DC and AC-DC combined voltages. Both short-time tests and constant-stress tests were carried out when...
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 dielectric properties of transformer oil effects its service life,and the safety grade of distribution network. Nanoparticles have attracted much attention in recent years, because they can enhance the dielectric properties of transformer oil, and also have a wide range of potential applications. In this paper, stable nanofluid of Fe3O4 nanoparticles with different concentration in the transformer...
This paper presents the basic physical, chemical and electrical properties of a type of rapeseed oil based dielectric liquid. Dielectric properties including relative dielectric permittivity, dissipation factor, and breakdown voltage of the rapeseed oil paper insulation are presented and also compared with those parameters of mineral transformer oil paper insulation. Moreover, four types of small...
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