CN114823173B - Vacuum impregnation process for polypropylene film power capacitor - Google Patents
Vacuum impregnation process for polypropylene film power capacitor Download PDFInfo
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- CN114823173B CN114823173B CN202210598962.6A CN202210598962A CN114823173B CN 114823173 B CN114823173 B CN 114823173B CN 202210598962 A CN202210598962 A CN 202210598962A CN 114823173 B CN114823173 B CN 114823173B
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- Prior art keywords
- power capacitor
- vacuum
- polypropylene film
- capacitor
- impregnation process
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- 239000003990 capacitor Substances 0.000 title claims abstract description 109
- 238000005470 impregnation Methods 0.000 title claims abstract description 32
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 27
- -1 polypropylene Polymers 0.000 title claims abstract description 27
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 37
- 239000011810 insulating material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000012546 transfer 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
- 238000004519 manufacturing process Methods 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
- 230000032683 aging Effects 0.000 description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010409 thin film 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
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 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
- 230000018109 developmental process Effects 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
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 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 the power capacitor in a vacuum tank, and heating the power capacitor to 70-75 ℃; s2: when the temperature of the capacitance core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the inside of the vacuum tank and the power capacitor; s3: stopping heating when the temperature of the capacitance core of the power capacitor reaches 80-82 ℃, and then cooling the power capacitor and the vacuum tube; s4: stopping cooling when the temperature of the capacitance core of the power capacitor reaches 60-65 ℃, and injecting an impregnant into the power capacitor and impregnating for a long time when the pressure in the vacuum tank is lower than 10 Pa; s5: after the impregnation is completed, the power capacitor is taken out, cleaned and sealed. The vacuum impregnation process is beneficial to the optimization and improvement of 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 is proposed in which most of capacitor paper is replaced by 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 appliances and the like, can further reduce the size of the capacitors, and reduces dielectric loss to improve the electric energy efficiency.
The existing power capacitor has a certain defect in the polypropylene film raw material supply, and the international situation is continuously changed along with the increase and development of the power resource demands of China. The biaxially oriented polypropylene film is used as a core component of the capacitor unit, and the particles for producing the polypropylene film still mostly depend on foreign manufacturer import, so that monopoly phenomenon is easily caused, and the possibility of outage exists due to unstable supply of goods sources. Purchasing requires a lengthy logistics cycle, which can have an impact on both cost and efficiency. Therefore, the performance and the stability of the raw materials are insufficient, and domestic polypropylene films produced by particles for replacing imported polypropylene films exist at present.
In order to remove the moisture and gas in the capacitor to the maximum extent in the production process of the power capacitor, the vacuum impregnation treatment is needed, but the vacuum impregnation technology of the capacitor of the imported polypropylene film which is suitable for the production of imported material grains is not suitable for the capacitor produced by the polypropylene film produced by the domestic grains, so the vacuum impregnation technology of the domestic polypropylene film capacitor needs 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 improvement of various performances of the power capacitor.
In order to achieve the above 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: placing a power capacitor in a vacuum tank, heating the power capacitor to 70-75 ℃, when the heating temperature is too high, aging and shrinkage phenomena of the insulating material of the capacitor unit occur to damage the insulating performance of the insulating material, and when the temperature is insufficient, the evaporation speed of water in the capacitor unit is affected, and the subsequent evacuation is affected;
s2: when the temperature of the capacitance core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the inside of the vacuum tank and the power capacitor;
s3: stopping heating when the temperature of the capacitance core of the power capacitor reaches 80-82 ℃, and then cooling the power capacitor and the vacuum tube;
s4: stopping cooling when the temperature of the capacitance core of the power capacitor reaches 60-65 ℃, and injecting an impregnant into the power capacitor and impregnating when the pressure in the vacuum tank is lower than 10 Pa;
s5: after the impregnation is finished, taking out the power capacitor, cleaning and sealing;
wherein the vacuum equipment is always in operation during steps S3 and S4.
Preferably, the heating system in the vacuum impregnation process adopts steam to heat conduction oil, and the heat conduction oil is heated by the steam and is transferred to the vacuum tank.
Preferably, the cooling system of the vacuum impregnation process cools the heat conduction oil through a refrigerant, and the cooled heat conduction oil cools the vacuum tank.
The heat transfer oil is adopted for heat transfer or cooling, so that the temperatures of the capacitor and the capacitor core can be accurately controlled.
Preferably, the average value of the capacitance deviation of the polypropylene film power capacitor is 0.84%.
Preferably, the average dielectric loss of the polypropylene film power capacitor is 1.35×10 -4 。
Preferably, in the step S5, the power capacitor is taken out of the vacuum tank and left to stand, and the power capacitor is cleaned and the oil filling hole of the power capacitor is sealed.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
the invention precisely controls the temperature of the capacitor core, and can start the vacuum equipment to vacuumize the vacuum tank and the power capacitor when the temperature of the capacitor core reaches 74-76 ℃, and stops heating and cooling when the temperature of the capacitor core reaches 80-82 ℃, and stops cooling when the temperature of the capacitor core reaches 60-65 ℃ and the pressure in the vacuum tank is lower than 10Pa, so that vacuum impregnation can be performed. Because the limit of the ultimate vacuum degree of the vacuum tank can not raise the vacuum degree without limit, the temperature range is precisely controlled, so that the evaporation and condensation of the water in the tank reach a dynamic balance without affecting the electrical performance of the capacitor, and the temperature of the capacitor is precisely controlled. Various indexes of the domestic polypropylene film capacitor impregnated by the impregnation process reach standard values, and particularly, the capacitance deviation range is obviously narrowed compared with the current imported polypropylene film capacitor, and the dielectric loss is equivalent. Therefore, the vacuum impregnator can make the polypropylene film capacitor produced by domestic material grains truly put into practical use, and has great economic benefit and practical significance.
Detailed Description
The vacuum impregnation process of the polypropylene film power capacitor provided by the invention is further described in detail below with reference to specific examples. The advantages and features of the present invention will become more apparent from the following description.
Example 1
When the power capacitor unit element is rolled, the adopted film is selected from a polypropylene film produced by domestic granules (hereinafter referred to as domestic film, and a polypropylene film produced by opposite imported granules is referred to as imported film), the domestic film and an aluminum foil are used as raw materials to be rolled into the element through a rolling machine, an insulating piece and a connecting piece are manufactured, the element is stacked for core welding, various sizes and pressure resistance of the core are inspected, then the core is wound and packaged, and after the core is packaged, the core is welded with an integrated box cover, so that the domestic film power capacitor is obtained.
In the practical production process, the vacuum impregnation process of the conventional imported film power capacitor is not suitable for the domestic film power capacitor because the domestic film is different from the imported film (the performance parameters of the domestic film and the imported film are compared in table 1), so the invention provides a vacuum impregnation process aiming at 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 comprises the following steps:
s1: placing a power capacitor in a vacuum tank, heating the power capacitor to 70-75 ℃, when the heating temperature is too high, aging and shrinkage phenomena of the insulating material of the capacitor unit occur to damage the insulating performance of the insulating material, and when the temperature is insufficient, the evaporation speed of water in the capacitor unit is affected, and the subsequent evacuation is affected;
s2: when the temperature of the capacitance core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the inside of the vacuum tank and the power capacitor;
s3: stopping heating when the temperature of the capacitance core of the power capacitor reaches 80-82 ℃, and then cooling the power capacitor and the vacuum tube;
s4: stopping cooling when the temperature of the capacitance core of the power capacitor reaches 60-65 ℃, and injecting an impregnant into the power capacitor and impregnating when the pressure in the vacuum tank is lower than 10 Pa;
s5: after the impregnation is finished, taking out the power capacitor from the vacuum tank, standing, cleaning the power capacitor, and sealing an oil filling hole of the power capacitor;
wherein, the vacuum equipment is always operated in the process of steps S3 and S4, the vacuum tank and the capacitor are always vacuumized, and the pressure in the vacuum tank is kept below 10Pa in the impregnating process of the impregnant.
The heating system in the vacuum impregnation process adopts steam to heat conduction oil, and the heat conduction oil is heated by the steam and is transferred to the vacuum tank.
The cooling system of the vacuum impregnation process cools the heat conduction oil through a refrigerant, and the cooled heat conduction oil cools the vacuum tank.
The heat transfer oil is adopted for heat radiation type heat transfer or cooling, so that the temperature of the capacitor and the capacitor core can be accurately controlled.
After the domestic thin film capacitor is sealed and then kept stand for two days for about 2 days, the capacitor is routinely tested by using professional equipment: capacitance measurement, capacitor loss tangent measurement, alternating current voltage test between a terminal and a shell, direct current or alternating current withstand voltage test, partial discharge test and internal fuse discharge test, and the comparison standard is up to the standard.
Comparison of the vacuum impregnated and inlet film capacitor of example 1 using the existing vacuum impregnation process shows that:
1. the average value of the capacitance deviation of the imported 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 imported film capacitor unit is 1.3×10 -4 The average dielectric loss of the capacitor unit of example 1 was 1.35×10 -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 within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (4)
1. The vacuum impregnation process of the polypropylene film power capacitor is characterized by comprising the following steps of:
s1: placing the power capacitor in a vacuum tank, and heating the power capacitor to 70-75 ℃;
s2: when the temperature of the capacitance core of the power capacitor reaches 74-76 ℃, starting vacuum equipment, and vacuumizing the inside of the vacuum tank and the power capacitor;
s3: stopping heating when the temperature of the capacitance core of the power capacitor reaches 80-82 ℃, and then cooling the power capacitor and the vacuum tank;
s4: stopping cooling when the temperature of the capacitance core of the power capacitor reaches 60-65 ℃, and injecting an impregnant into the power capacitor and impregnating when the pressure in the vacuum tank is lower than 10 Pa;
s5: after the impregnation is finished, taking out the power capacitor, cleaning and sealing;
wherein the vacuum equipment is always operated in the process of the steps S3 and S4;
the heating system in the vacuum impregnation process adopts steam to heat conduction oil, and the heat conduction oil is heated by the steam and is transferred to the vacuum tank;
the cooling system of the vacuum impregnation process cools the heat conduction oil through a refrigerant, and the cooled heat conduction oil cools the vacuum tank.
2. The vacuum impregnation process of a polypropylene film power capacitor according to claim 1, wherein the average value of capacitance deviation of the polypropylene film power capacitor is 0.84%.
3. The vacuum impregnation process of a polypropylene film power capacitor according to claim 1, wherein the average dielectric loss of the polypropylene film power capacitor is 1.35 x 10 -4 。
4. The vacuum impregnation process of a polypropylene film power capacitor according to claim 1, wherein in the step S5, the power capacitor is taken out of the vacuum tank and left to stand, and the power capacitor is cleaned and the oil filling 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 CN114823173A (en) | 2022-07-29 |
| CN114823173B true CN114823173B (en) | 2024-03-15 |
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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 |
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| Country | Link |
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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 |
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| Publication number | Publication date |
|---|---|
| CN114823173A (en) | 2022-07-29 |
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