Epoxy resin pouring dry type transformer

Abstract

The invention discloses an epoxy resin pouring dry type transformer in the field of power transmission and distribution devices, which comprises a high-voltage coil and a low-voltage coil which are coaxially arranged, wherein the low-voltage coil is positioned at the inner side of the high-voltage coil; the high-voltage coil and the low-voltage coil are integrally arranged in a poured epoxy resininsulating layer; and a prescription of the epoxy resin insulating layer comprises bisphenol A epoxy resin, quartz sand, mica powder, an amine curing agent and an active flexibilizer. The compositionof the components is poured between the high-voltage coil and low-voltage coil which are coaxially arranged and outside the high-voltage coil after uniformly mixed and cured at a temperature of 125-155 DEG C. By adding all the components, the epoxy resin pouring dry type transformer has the advantages of high heat resistance, high heat radiating performance, high toughness and same thermal expansion coefficient with copper; and the transformer can rapidly conduct heat during overloading running, ensure the safety of the transformer and can run for a long time under overloading.

Description

technical field [0001] The invention relates to a transformer, in particular to a dry-type transformer. Background technique [0002] When the transformer is working, it will generate a certain amount of electromagnetic vibration and release a lot of heat at the same time. This requires it to have good heat dissipation. It will not cause stress damage when it expands with heat and contracts with cold. At the same time, it can withstand vibration and is not easy to break. In the prior art, there is a dry-type transformer cast with epoxy resin, which includes high-voltage coils and low-voltage coils arranged concentrically. The high-voltage coils and low-voltage coils are integrally cast in epoxy resin, and the epoxy resin is filled with Fill the gap between the high voltage coil and the low voltage coil. Its disadvantages are: First, due to the difference between the expansion coefficient of the epoxy resin itself and the expansion coefficient of the coil copper conductor, w...

AI Technical Summary

Problems solved by technology

Its disadvantages are: First, due to the difference between the expansion coefficient of the epoxy resin itself and the expansion coefficient of the coil copper conductor, when the temperature rises, a large internal stress will be generated between the two, which will easily cause the epoxy The cracking and deformation of the resin affect the reliability of the transformer; second, the epoxy resin is brittle, has poor impact damage resistance, and relatively poor heat resistance, generally less than 170°C, and when the transformer is overloaded, the heat generated The thermal conductivity of the epoxy resin itself is not good. Therefore, the heat dissipation effect of the existing epoxy resin cast dry-type transformer is relatively poor, which limits the ability of the transformer to operate under overload.

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