Function and characteristics of dry type resin transformer

  Dry type transformer (herein referred to as epoxy-insulated transformers) are mainly used in places with high fire protection requirements, such as high-rise buildings, airports, oil depots, etc. The type of resin insulation. Transformers ……

 

Dry type transformer (herein referred to as epoxy-insulated transformers) are mainly used in places with high fire protection requirements, such as high-rise buildings, airports, oil depots, etc.

The type of resin insulation. Transformers with epoxy resin insulation can be divided into epoxy quartz sand mixture vacuum casting type, epoxy alkali-free glass fiber reinforced vacuum differential pressure casting type and alkali-free glass fiber wrapping impregnation type according to the manufacturing process characteristics.

  • Epoxy quartz sand mixture vacuum casting insulation. This kind of transformer is made of quartz sand as epoxy resin filling material. The coil is wrapped by insulating varnish and wrapped in a coil casting mold. Under vacuum condition, the mixture of epoxy resin and quartz sand is used for drip irrigation Since the casting process is difficult to meet the quality requirements, such as residual bubbles, local unevenness of the mixture, and local thermal stress cracking, the insulated transformer is not suitable for use in areas with hot and humid environments and large load changes.
  • Epoxy alkali-free glass fiber reinforced vacuum differential pressure casting insulation. The epoxy alkali-free glass fiber reinforcement is insulated with an outer layer of the insulation between the winding layers by an alkali-free glass short fiber glass mat. The outermost layer of the insulation wrap is generally 1 – 3 m thickness, mixed by epoxy resin castable ratio, and removed by high-vacuum vacuum casting, because the thickness of the wrap insulation is thin, when impregnated is bad, it is easy to form a partial discharge point. Therefore, the mixing of the castable is required to be complete, the vacuum removal of the bubble should be thorough, and the low viscosity and casting speed of the castable should be mastered to ensure the high quality of the wire package impregnation during the casting process.
  • Alkali-free glass fiber wrapped impregnation insulation. The alkali-free glass fiber wrapped impregnated transformer is used to complete the coil interlayer insulation treatment and the coil impregnation while winding the transformer coil. It does not need the winding forming mold in the above two methods of impregnation, but requires the resin to have a small viscosity. The resin should not leave tiny bubbles during coil winding and impregnation.

ZTELEC Group is a manufacturer of electrical insulation materials and transformers with a history of 60 years in China. We have branch offices in Xuchang city, Chengdu city, and Vietnam. And our products have been exported to India, Thailand, Singapore, Malaysia, Germany, Russia and many other countries.

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