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Insulation and Characteristics of Dry Resin Transformer

  Dry-type transformers (here referred to as epoxy-insulated transformers) are mainly used in places with high fire protection requirements. Such as high-rise buildings, airports, oil depots and so on.

  1, the type of resin insulation. Epoxy tree refers to the insulation of the transformer according to the characteristics of the manufacturing process can be divided into epoxy quartz sand mixture vacuum casting type, epoxy alkali-free glass fiber reinforced vacuum pressure casting type and alkali-free glass fiber wrapping impregnated three.

   epoxy quartz sand mixture vacuum casting insulation. This type of transformer is a quartz sand as epoxy filler, will be impregnated with insulating paint wrapped around the coil, put the coil casting mold, under vacuum conditions and then mixed with epoxy resin and quartz sand drip irrigation pouring. As the casting process is difficult to meet the quality requirements, such as residual bubbles, the mixture of local uneven and may lead to local thermal stress cracking, so that the insulation of the transformer should not be used for hot and humid environment and load changes in the larger area.

   epoxy alkali-free glass fiber reinforced vacuum pressure casting insulation. Epoxy E-glass fiber reinforced with E-glass short fiber glass felt for the insulation of the outer layer of insulation insulation. The outer layer of the insulation package thickness is generally 1 ~ 3m of thin insulation, the proportion of epoxy resin castable mixture, and in high vacuum to remove the bubble casting, due to the thickness of the package insulation is thin, when the immersion It is easy to form a partial discharge point, so the mixing of castables is required to be complete, vacuum in addition to air bubbles to thoroughly, and master the low viscosity and pouring rate of castables to ensure that the pouring process of the package of high quality.

   E-glass fiber wrapped around the impregnated insulation. E-glass fiber wrapping impregnated transformer is in the winding transformer coil at the same time, complete the coil layer insulation treatment and coil impregnation, it does not need the above two ways to impregnate the process of winding mold, but requires a small resin viscosity, The resin should not contain tiny bubbles during coil winding and dipping.

  2, resin transformer insulation characteristics and maintenance.

  Resin transformer insulation level and oil-immersed transformer is not significant difference, the key lies in the resin transformer temperature rise and partial discharge of these two indicators.

  The average temperature rise of the resin transformer is higher than that of the oil-immersed transformer. Therefore, the corresponding requirements are higher for the heat-resistant material, but because the average temperature rise of the transformer does not reflect the temperature of the hotest part of the winding. The heat level is only selected according to the average temperature rise, or improperly selected, or the long-term overload operation of the resin transformer will affect the life of the transformer.

  As the temperature measurement of the transformer often does not reflect the temperature of the most hot parts of the transformer, therefore, the best conditions in the transformer under the maximum load operation, with infrared thermometer to check the most hot parts of the resin transformer, and targeted to adjust Fan cooling equipment direction and angle, control the transformer local temperature rise, to ensure the safe operation of the transformer.

   The size of the partial discharge of the resin transformer is related to the electric field distribution of the transformer, the uniformity of the resin mixing and the residual bubbles or resin cracking. The size of the partial discharge affects the performance, quality and service life of the resin transformer. Therefore, the measurement and acceptance of the partial discharge of the resin transformer is a comprehensive examination of the process and quality of the resin transformer. After the acceptance and overhaul of the resin transformer, the partial discharge test should be carried out and evaluated according to whether the partial discharge is changed Its quality and performance stability.

  With the increasingly extensive application of dry-type transformers, in the choice of transformers at the same time, should deal with its process structure, insulation design, insulation configuration to understand clearly, choose the production process and quality assurance system, strict production management, technical performance and reliable products, To ensure that the transformer product quality and heat life, in order to improve the safe operation of the transformer and power supply reliability.

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