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Material used for dry power transformer and its use method

A power transformer, dry-type technology, applied in the direction of transformer/inductor coil/winding/connection, plastic/resin/wax insulator, organic insulator, etc., can solve problems affecting the use of dry-type transformers, transformer cracking, uneven casting, etc. , to achieve the effect of improving short-circuit resistance, reducing expansion coefficient and improving thermal conductivity

Inactive Publication Date: 2009-08-05
WUHU JINNIU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the epoxy resin material or the pouring process is different, which may easily lead to uneven pouring of the material containing epoxy resin on the outer surface of the coil, resulting in varying degrees of cracking in the transformer. The cracking rate of the insulating layer after 2 years of use is 1- 1.5%, seriously affecting the use of dry-type transformers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The production of dry-type power transformers includes the following processes: coil winding process, coil drying process, coil casting process, coil demoulding process, and coil curing process:

[0034] In the described coil pouring process:

[0035] 1. Mixing process: first heat the epoxy resin to 85°C, add fillers, curing agents, toughening agents, and accelerators in sequence, and stir evenly to form a castable, epoxy resin: curing agent: toughening agent: accelerator: Coloring agent: filler (weight ratio) = 1:0.6:0.1:0.0001:0.01:1.

[0036] 2. Pouring process: Pouring under the conditions of vacuum degree of 30Pa, temperature of 95°C and time of 80 minutes.

[0037] In the pouring process, an ultrasonic device with a wavelength of 40h and a power of 500W is installed under the coil.

Embodiment 2

[0039] The production of dry-type power transformers includes the following processes: coil winding process, coil drying process, coil casting process, coil demoulding process, and coil curing process:

[0040] In the described coil pouring process:

[0041] 1. Mixing process: first heat the epoxy resin to 87°C, then add fillers, curing agents, toughening agents, and accelerators in sequence, and stir evenly to form a castable. Epoxy resin: curing agent: toughening agent: accelerator: Coloring agent: filler (weight) = 1:0.8:0.2:0.0002:0.02:1.1.

[0042] 2. Pouring process: Pouring under the conditions of vacuum degree of 40Pa, temperature of 98°C and time of 90 minutes.

[0043] In the pouring process, an ultrasonic device with a wavelength of 45h and a power of 750W is installed under the coil.

Embodiment 3

[0045] The production of dry-type power transformers includes the following processes: coil winding process, coil drying process, coil casting process, coil demoulding process, and coil curing process:

[0046] In the described coil pouring process:

[0047] 1. Mixing process: first heat the epoxy resin to 90°C, then add fillers, curing agents, toughening agents, and accelerators in sequence, and stir evenly to form a castable. Epoxy resin: curing agent: toughening agent: accelerator: Stain:filler=1:1:0.3:0.0003:0.03:1.2.

[0048] 2. Pouring process: Pouring under the conditions of vacuum degree of 50Pa, temperature of 100°C and time of 100 minutes.

[0049] In the pouring process, an ultrasonic device with a wavelength of 50h and a power of 1000W is installed under the coil.

[0050] The thickness of the insulating layer of the dry-type transformer prepared in Examples 1-3 is 2.5-4 mm, and the cracking rate of the insulating layer after 2 years of use is 0.1-0.2%.

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Abstract

The invention discloses a material used for a dry-type power transformer and a using method thereof; the material comprises epoxy resin, curing agent, toughening agent, promoter, colorant, and filler; the using method thereof includes coil winding process, coil drying process, coil casting process, coil demoulding process, and coil curing process; compared with the prior art, the invention adds quartz powder in the epoxy resin, reduces the expansion coefficient of the resin system, improves the thermal conductivity of the resin, leads the casting material to be uniformly cast on the outer periphery of the coil and causes the cracking rate of an insulating layer after the transformer is used for two years to be 0.1-0.2% by optimizing the casting process, and thus improving the short-circuit resistance strength of the dry-type power transformer.

Description

technical field [0001] The invention belongs to a material for a dry-type power transformer and a use method thereof, in particular to a material for a dry-type power transformer containing epoxy resin and a use method thereof. Background technique [0002] Dry-type power transformers include insulating layers and coils. The commonly used insulating layer materials are epoxy resin-based materials. Epoxy resin is a widely used chemical raw material with flame retardant, flame retardant, and superior electrical properties. The insulation strength is higher than that of air and transformer oil. The transformer coil after casting has high mechanical strength, excellent moisture-proof and dust-proof performance. Widely used in urban power grids, especially in places with high fire protection and safety requirements. However, the composition of the epoxy resin material or the pouring process is different, which may easily lead to uneven pouring of the material containing epoxy re...

Claims

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Application Information

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IPC IPC(8): H01F27/32H01B3/30H01F41/12
Inventor 金文徐汉东刘志文王国英
Owner WUHU JINNIU ELECTRIC
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