Epoxy resin pouring dry type transformer

A dry-type transformer and epoxy resin technology, applied in the field of transformers, can solve problems such as deformation, poor thermal conductivity of epoxy resin, and high brittleness of epoxy resin

Active Publication Date: 2012-02-22
YANGZHOU HUADING ELECTRIC APPLIANCE +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 b...

Method used

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  • Epoxy resin pouring dry type transformer
  • Epoxy resin pouring dry type transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, it is an epoxy resin casting dry-type transformer, which includes a high-voltage coil 2 and a low-voltage coil 4 arranged coaxially. The low-voltage coil 4 is located inside the high-voltage coil 2. In the epoxy resin insulating layer 1, a cooling air channel 3 is arranged between the high voltage coil and the low voltage coil in the epoxy resin insulating layer, and the inner surface of the cooling air channel 3 is zigzag.

[0018] The formulation of the epoxy resin insulation layer includes the following components:

[0019] Bisphenol A type epoxy resin, epoxy value 0.40--, dosage 10Kg;

[0020] Aluminum nitride powder with a particle size of 40-50nm, the dosage is 0.2kg;

[0021] Quartz sand with a particle size of 10-30 mesh, the dosage is 1.5kg;

[0022] Quartz sand with a particle size of 100-150 mesh, the dosage is 1kg;

[0023] Mica powder with a particle size of 200-300 mesh, dosage 1kg;

[0024] Polyamide curing agent 650, dosag...

Embodiment 2

[0034] An epoxy resin casting dry-type transformer, comprising a high-voltage coil and a low-voltage coil arranged coaxially, the low-voltage coil is located inside the high-voltage coil, and the high-voltage coil and the low-voltage coil are integrally arranged in a cast epoxy resin insulating layer, and the ring A cooling air passage is arranged between the high-voltage coil and the low-voltage coil in the epoxy resin insulating layer, and the inner surface of the cooling air passage is zigzag.

[0035] The formulation of the epoxy resin insulating layer includes the following components: bisphenol A epoxy resin, epoxy value 0.55--, dosage 10Kg; particle size 70-80nm aluminum nitride powder, dosage 1kg; particle size 10-30 mesh Quartz sand, dosage 3kg; particle size 100-150 mesh quartz sand, dosage 2kg; particle size 200-300 mesh mica powder, dosage 2.5kg; polyamide curing agent 650, dosage 12kg; ), dosage 1kg.

Embodiment 3

[0037] An epoxy resin casting dry-type transformer, comprising a high-voltage coil and a low-voltage coil arranged coaxially, the low-voltage coil is located inside the high-voltage coil, and the high-voltage coil and the low-voltage coil are integrally arranged in a cast epoxy resin insulating layer, and the ring A cooling air passage is arranged between the high-voltage coil and the low-voltage coil in the epoxy resin insulating layer, and the inner surface of the cooling air passage is zigzag.

[0038] The formulation of the epoxy resin insulation layer includes the following components: bisphenol A epoxy resin, epoxy value 0.55--, dosage 10Kg; particle size 50-70nm aluminum nitride powder, dosage 0.5kg; particle size 10-30 Purpose quartz sand, dosage 2kg; particle size 100-150 mesh quartz sand, dosage 1.5kg; particle size 200-300 mesh mica powder, dosage 1.5kg; dimer acid-based polyamide curing agent, dosage 10kg; hydroxyl-terminated nitrile rubber , dosage 0.8kg.

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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...

Claims

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Application Information

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IPC IPC(8): H01F27/32H01B3/18C08L63/02C08K3/28C08K3/36C08K3/34
Inventor 蔡长虹曾宝明朱滨
Owner YANGZHOU HUADING ELECTRIC APPLIANCE
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