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Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film

A technology of polypropylene film and impregnation process, which is applied in the direction of film/thick film capacitors, capacitors, fixed capacitors, etc., can solve the problems of poor reliability, achieve good reliability, achieve miniaturization, and increase the rated working field strength

Active Publication Date: 2012-10-24
ECU ELECTRONICS INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicone gel or ozokerite is only suitable for impregnation under low vacuum, and it is difficult to completely penetrate into the capacitor core, so the reliability is still poor

Method used

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  • Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film
  • Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film
  • Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film

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Experimental program
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Embodiment 1

[0025] 1) Winding of capacitor core: using two or more layers of polypropylene film 1 as the medium, aluminum foil 2 as the polar plate, and winding into a cylindrical capacitor core 3;

[0026] 2) Capacitor assembly: After the capacitor core 3 is wound, it is assembled in series and parallel and installed into the shell 4. The structure diagram is shown in figure 2 ;

[0027] 3). Drying of the capacitor: Dry the capacitor with the capacitor core at a temperature of 70 ℃ ± 5 ℃, atmospheric pressure for 2 hours, and then the vacuum degree ≤ 1×10 -3 mmHg, temperature 70℃±5℃, vacuum drying for 12 hours;

[0028] 4) Vacuum treatment of impregnant: vacuum treatment of low-temperature diarylethane insulating oil of impregnant: 90℃±5℃, time 10 hours, vacuum degree ≤1×10 -3 mmHg; oil withstand voltage meets the requirements of 50KV / 2.5mm;

[0029] 5) High-vacuum impregnation: Cool the impregnant low-temperature diarylethane insulating oil and the capacitor to 55℃±5℃, and impregnate the low-te...

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Abstract

The invention discloses an impregnation process of a metal foil type capacitor with a dry type high-pressure polypropylene film. The dipping process comprises the steps: conducting high vacuum impregnation on low-temperature diphenylethane insulating oil in a capacitor well equipped with a capacitive core; inversing the capacitor after the impregnation is finished, and leaching the low-temperature diphenylethane insulating oil; conducting low vacuum impregnation by adopting organic silica gel GN-503 as impregnant; conducting curing at normal temperature after the impregnation is finished; and packaging the capacitor by adopting epoxy resin. By adopting the process scheme, the rated working field intensity of the metal foil type capacitor with the dry type high-pressure polypropylene film is greatly improved compared with that of the traditional process scheme, thus being capable of realizing miniaturization, and having the advantage of good reliability.

Description

technical field [0001] The invention relates to a dry-type high-voltage polypropylene film metal foil capacitor impregnation process, in particular to a high-voltage high-capacity polypropylene film metal foil capacitor impregnation process. Background technique [0002] At present, there are two options for the impregnation process of dry high-voltage polypropylene film metal foil capacitors: [0003] One is to use two or more layers of polypropylene film as the medium, and aluminum foil as the pole plate, which is wound into a cylindrical capacitor core or flattened into a flat capacitor core, and then shaped after thermal polymerization (that is, a certain temperature is applied) and pressure using the shrinkage characteristics of polypropylene film at high temperature to shape), and finally encapsulated with epoxy resin. This process scheme is suitable for a single capacitor core capacitor. It is difficult to increase the rated voltage and capacitance of the capacitor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/00H01G4/33
Inventor 郭翔
Owner ECU ELECTRONICS INDAL