CN114823173A - Vacuum impregnation process for polypropylene film power capacitor - Google Patents
Vacuum impregnation process for polypropylene film power capacitor Download PDFInfo
- Publication number
- CN114823173A CN114823173A CN202210598962.6A CN202210598962A CN114823173A CN 114823173 A CN114823173 A CN 114823173A CN 202210598962 A CN202210598962 A CN 202210598962A CN 114823173 A CN114823173 A CN 114823173A
- Authority
- CN
- China
- Prior art keywords
- power capacitor
- capacitor
- vacuum
- polypropylene film
- impregnation process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 117
- 238000005470 impregnation Methods 0.000 title claims abstract description 36
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 29
- -1 polypropylene Polymers 0.000 title claims abstract description 29
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000012546 transfer Methods 0.000 claims description 12
- 239000003507 refrigerant Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 39
- 239000008187 granular material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/04—Drying; Impregnating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses a vacuum impregnation process of a polypropylene film power capacitor, which comprises the following steps: s1: placing a power capacitor in a vacuum tank, and heating the power capacitor to 70-75 ℃; s2: when the temperature of a capacitor core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the interior of a vacuum tank and the power capacitor; s3: when the temperature of a capacitor core of the power capacitor reaches 80-82 ℃, stopping heating, and then cooling the power capacitor and the vacuum tube; s4: when the temperature of a capacitor core of the power capacitor reaches 60-65 ℃, stopping cooling, and when the pressure in the vacuum tank is lower than 10Pa, injecting an impregnant into the power capacitor, and impregnating for a long time; s5: and after the impregnation is finished, taking out the power capacitor, cleaning and sealing. The vacuum impregnation process is beneficial to optimizing and improving various performances of the power capacitor.
Description
Technical Field
The invention belongs to the technical field of vacuum impregnation of capacitors, and particularly relates to a vacuum impregnation process of a polypropylene film power capacitor.
Background
In the early 60 s, power capacitors were constructed by impregnating a liquid medium with special capacitor paper. In 1963, a capacitor system was proposed in which a majority of capacitor paper was replaced with a biaxially oriented polypropylene film, which is an electrical insulating material with abundant resources, low cost, and good performance. The capacitor has wide application prospects in various aspects of power capacitors, cables, motor and electric appliances and the like, can further reduce the size of the capacitor, and reduces dielectric loss to improve the electric energy efficiency.
The existing power capacitor has certain defects in the raw material supply of the polypropylene film, and the international situation is constantly changed along with the increase of the demand of power resources and the deepening of the development in China. The biaxially oriented polypropylene film is used as a core component of a capacitor unit, most particles for producing the polypropylene film at present still depend on import of foreign manufacturers, monopoly phenomenon is easily caused, and the goods supply is unstable and has the possibility of goods failure. The procurement needs to go through a long logistics period, which has an impact on both cost and efficiency. Therefore, the raw material performance and the stability are insufficient, so that the domestic polypropylene film produced by the particles instead of the imported polypropylene film is available at home at present.
In the production process of the power capacitor, in order to remove moisture and gas in the capacitor to the maximum extent, vacuum impregnation treatment is required, but the vacuum impregnation process of the capacitor which is suitable for the imported polypropylene film produced by imported granules at present is not suitable for the capacitor produced by the polypropylene film produced by domestic granules, so the vacuum impregnation process of the domestic polypropylene film capacitor is required to be improved.
Disclosure of Invention
Aiming at the technical problems, the invention provides a vacuum impregnation process for a polypropylene film power capacitor, which is beneficial to the optimization and promotion of various performances of the power capacitor.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a vacuum impregnation process of a polypropylene film power capacitor comprises the following steps:
s1: the power capacitor is placed in a vacuum tank and heated to 70-75 ℃, when the heating temperature is too high, the insulating material of the capacitor unit can age and shrink to destroy the insulating property, and when the temperature is not enough, the evaporation speed of water in the capacitor unit can be influenced, and the subsequent evacuation is influenced;
s2: when the temperature of a capacitor core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the interior of a vacuum tank and the power capacitor;
s3: when the temperature of a capacitor core of the power capacitor reaches 80-82 ℃, stopping heating, and then cooling the power capacitor and the vacuum tube;
s4: when the temperature of a capacitor core of the power capacitor reaches 60-65 ℃, stopping cooling, and when the pressure in the vacuum tank is lower than 10Pa, injecting an impregnant into the power capacitor and impregnating;
s5: after the impregnation is finished, taking out the power capacitor, cleaning and sealing;
wherein the vacuum apparatus is always operated during steps S3 and S4.
Preferably, the heating system in the vacuum impregnation process heats the heat transfer oil by using steam, heats the heat transfer oil by using the steam, and transfers the heat to the vacuum tank.
Preferably, the cooling system of the vacuum impregnation process cools the heat transfer oil through a refrigerant, and the cooled heat transfer oil cools the vacuum tank.
The temperature of the capacitor and the capacitor core can be accurately controlled by adopting heat conduction oil for heat transfer or cooling.
Preferably, the average value of the capacitance deviation of the polypropylene film power capacitor is 0.84%.
Preferably, the average value of the dielectric loss of the polypropylene film power capacitor is 1.35 multiplied by 10 -4 。
Preferably, in step S5, the power capacitor is taken out of the vacuum tank and left standing, and the power capacitor is cleaned and the oil hole of the power capacitor is sealed.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the invention accurately controls the temperature of the condenser core, and can start the vacuum equipment to vacuumize the vacuum tank and the power capacitor when the temperature of the condenser core reaches 74-76 ℃, and stop heating and cool when the temperature of the condenser core reaches 80-82 ℃, and stop cooling when the temperature of the condenser core reaches 60-65 ℃, and can perform vacuum impregnation when the pressure in the vacuum tank is lower than 10 Pa. Because the limit of the ultimate vacuum degree of the vacuum tank can not improve the vacuum degree without limit, the temperature range is controlled accurately, the evaporation and condensation of water in the tank reach a dynamic balance, and the electric performance of the capacitor is not influenced, so the temperature of the capacitor is controlled accurately. The indexes of the domestic polypropylene film capacitor dipped by the dipping process of the invention reach standard values, especially the capacitance deviation range is obviously narrower than that of the prior imported polypropylene film capacitor, and the dielectric loss is equivalent. Therefore, the vacuum impregnator can really put the polypropylene film capacitor produced by domestic material granules into use, and has great economic benefit and practical significance.
Detailed Description
The vacuum impregnation process of the power capacitor with polypropylene film according to the present invention will be further described in detail with reference to the following specific examples. The advantages and features of the present invention will become more apparent from the following description.
Example 1
When the unit elements of the power capacitor are rolled, the adopted films are made of polypropylene films produced by domestic granules (hereinafter referred to as domestic films, and polypropylene films produced by relative imported granules are referred to as imported films), the domestic films and aluminum foils are used as raw materials and rolled into elements by a rolling machine, the elements are stacked after the insulating parts and connecting sheets are manufactured for core welding, the elements are wrapped and boxed after various sizes and pressure resistance of the cores are tested, and the elements are welded with an integrated box cover after the boxes are boxed to obtain the domestic film power capacitor.
In the embodiment, in the actual production process, because the domestic films are different from the imported films (table 1 is the comparison of the performance parameters of the domestic films and the imported films), it is found that the existing vacuum impregnation process of the imported film power capacitor is not suitable for the domestic film power capacitor, and therefore, the invention provides a vacuum impregnation process for the domestic film power capacitor.
TABLE 1 comparison of domestic and imported film Performance parameters
The vacuum impregnation process suitable for the domestic thin film power capacitor specifically comprises the following steps:
s1: the power capacitor is placed in a vacuum tank and heated to 70-75 ℃, when the heating temperature is too high, the insulating material of the capacitor unit can age and shrink to destroy the insulating property, and when the temperature is not enough, the evaporation speed of water in the capacitor unit can be influenced, and the subsequent evacuation is influenced;
s2: when the temperature of a capacitor core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the interior of a vacuum tank and the power capacitor;
s3: when the temperature of a capacitor core of the power capacitor reaches 80-82 ℃, stopping heating, and then cooling the power capacitor and the vacuum tube;
s4: when the temperature of a capacitor core of the power capacitor reaches 60-65 ℃, stopping cooling, and when the pressure in the vacuum tank is lower than 10Pa, injecting an impregnant into the power capacitor and impregnating;
s5: after the impregnation is finished, taking out the power capacitor from the vacuum tank, standing, cleaning the power capacitor, and sealing an oil hole of the power capacitor;
wherein the vacuum apparatus is operated all the time during steps S3 and S4, the vacuum tank and the capacitor are evacuated all the time, and the pressure in the vacuum tank is maintained below 10Pa during the impregnant impregnation.
The heating system in the vacuum impregnation process adopts steam to heat the heat conduction oil, heats the heat conduction oil through the steam, and transfers the heat to the vacuum tank.
The cooling system of the vacuum impregnation process cools heat conducting oil through a refrigerant, and the cooled heat conducting oil cools the vacuum tank.
The heat conduction oil heat radiation type heat transfer or cooling is adopted, so that the temperature of the capacitor and the capacitor core can be accurately controlled.
After two consecutive days of about 2 days after the domestic film capacitor is sealed, the capacitor is routinely tested by using professional equipment: the capacitance measurement, the capacitor loss tangent measurement, the alternating voltage test between the terminal and the shell, the direct current or alternating current withstand voltage test, the partial discharge test and the internal fuse discharge test are all up to standard compared with normal indexes.
After the vacuum impregnation of the example 1, the film capacitor is compared with the imported film capacitor after the impregnation by the existing vacuum impregnation process, and the following results are found:
1. the average value of the capacitance deviation of the inlet film capacitor unit is 1.70%, the average value of the capacitance deviation of the capacitor unit in the embodiment 1 is 0.84%, and the capacitance deviation range is obviously narrowed;
2. the average dielectric loss of the inlet film capacitor unit is 1.3 multiplied by 10 -4 The average dielectric loss of the capacitor unit of example 1 was 1.35X 10 -4 The dielectric loss is comparable.
The embodiments of the present invention have been described in detail with reference to specific examples, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. A vacuum impregnation process of a polypropylene film power capacitor is characterized by comprising the following steps:
s1: placing a power capacitor in a vacuum tank, and heating the power capacitor to 70-75 ℃;
s2: when the temperature of a capacitor core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the interior of a vacuum tank and the power capacitor;
s3: when the temperature of a capacitor core of the power capacitor reaches 80-82 ℃, stopping heating, and then cooling the power capacitor and the vacuum tube;
s4: when the temperature of a capacitor core of the power capacitor reaches 60-65 ℃, stopping cooling, and when the pressure in the vacuum tank is lower than 10Pa, injecting an impregnant into the power capacitor and impregnating;
s5: after the impregnation is finished, taking out the power capacitor, cleaning and sealing;
wherein the vacuum apparatus is always operated during steps S3 and S4.
2. The vacuum impregnation process of the polypropylene film power capacitor as claimed in claim 1, wherein the heating system in the vacuum impregnation process heats the heat transfer oil by using steam, and the heat transfer oil is heated by the steam and transferred to the vacuum tank.
3. The vacuum impregnation process of the polypropylene film power capacitor as claimed in claim 2, wherein the cooling system of the vacuum impregnation process cools the heat transfer oil through a refrigerant, and the cooled heat transfer oil cools the vacuum tank.
4. The vacuum impregnation process for polypropylene film power capacitors as claimed in claim 1, wherein the average value of the capacitance deviation of the polypropylene film power capacitors is 0.84%.
5. The vacuum impregnation process for polypropylene film power capacitors as claimed in claim 1, wherein the average dielectric loss of the polypropylene film power capacitors is 1.35 x 10 -4 。
6. The vacuum impregnation process of polypropylene film power capacitor as claimed in claim 1, wherein in step S5, the power capacitor is taken out of the vacuum tank and left still, and cleaned, and the oil hole of the power capacitor is sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598962.6A CN114823173B (en) | 2022-05-30 | 2022-05-30 | Vacuum impregnation process for polypropylene film power capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598962.6A CN114823173B (en) | 2022-05-30 | 2022-05-30 | Vacuum impregnation process for polypropylene film power capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114823173A true CN114823173A (en) | 2022-07-29 |
| CN114823173B CN114823173B (en) | 2024-03-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210598962.6A Active CN114823173B (en) | 2022-05-30 | 2022-05-30 | Vacuum impregnation process for polypropylene film power capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114823173B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2844593A1 (en) * | 1978-10-13 | 1980-04-17 | Standard Elektrik Lorenz Ag | Vacuum impregnation of electric capacitors - where ultrasonic vibration is used after releasing the vacuum to reduce impregnation time |
| CN102013342A (en) * | 2010-09-26 | 2011-04-13 | 上海思源电力电容器有限公司 | Capacitor vacuum drying and dipping treatment system and capacitor vacuum drying and dipping treatment method |
| CN202003853U (en) * | 2010-09-26 | 2011-10-05 | 上海思源电力电容器有限公司 | Capacitor vacuum drying and dipping treatment system |
| CN102751090A (en) * | 2012-07-09 | 2012-10-24 | 合肥华耀电子工业有限公司 | Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film |
| CN105374581A (en) * | 2015-12-04 | 2016-03-02 | 浙江锦能电力科技有限公司 | Production process of interphase capacitor |
| CN212492819U (en) * | 2020-05-30 | 2021-02-09 | 北新禹王防水科技(广东)有限公司 | Heat tracing system for polyurethane production |
-
2022
- 2022-05-30 CN CN202210598962.6A patent/CN114823173B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2844593A1 (en) * | 1978-10-13 | 1980-04-17 | Standard Elektrik Lorenz Ag | Vacuum impregnation of electric capacitors - where ultrasonic vibration is used after releasing the vacuum to reduce impregnation time |
| CN102013342A (en) * | 2010-09-26 | 2011-04-13 | 上海思源电力电容器有限公司 | Capacitor vacuum drying and dipping treatment system and capacitor vacuum drying and dipping treatment method |
| CN202003853U (en) * | 2010-09-26 | 2011-10-05 | 上海思源电力电容器有限公司 | Capacitor vacuum drying and dipping treatment system |
| CN102751090A (en) * | 2012-07-09 | 2012-10-24 | 合肥华耀电子工业有限公司 | Impregnation process of metal foil type capacitor with dry type high-pressure polypropylene film |
| CN105374581A (en) * | 2015-12-04 | 2016-03-02 | 浙江锦能电力科技有限公司 | Production process of interphase capacitor |
| CN212492819U (en) * | 2020-05-30 | 2021-02-09 | 北新禹王防水科技(广东)有限公司 | Heat tracing system for polyurethane production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114823173B (en) | 2024-03-15 |
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