WO2010147562A1 - Method of protection condenser roll with epoxy resin - Google Patents
Method of protection condenser roll with epoxy resin Download PDFInfo
- Publication number
- WO2010147562A1 WO2010147562A1 PCT/SI2010/000037 SI2010000037W WO2010147562A1 WO 2010147562 A1 WO2010147562 A1 WO 2010147562A1 SI 2010000037 W SI2010000037 W SI 2010000037W WO 2010147562 A1 WO2010147562 A1 WO 2010147562A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- windings
- epoxy resin
- epoxide
- protecting
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 title claims abstract description 9
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 55
- 238000004804 winding Methods 0.000 claims abstract description 41
- 150000002118 epoxides Chemical class 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 abstract description 5
- 229920006255 plastic film Polymers 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000010773 plant oil Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- VDEUTRIMVYSCKW-UHFFFAOYSA-N acetyl octadecaneperoxoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OOC(C)=O VDEUTRIMVYSCKW-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/32—Wound capacitors
-
- 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
- H01G13/02—Machines for winding capacitors
Definitions
- the subject of the invention is a method for protecting a capacitor winding made of a metallised plastic film with an epoxy resin.
- An impregnation method in which a winding is first dried in vacuum at an increased temperature, impregnated with a liquid epoxide and then drained, makes it possible to produce a capacitor, in which the environmental influence is excluded. As a consequence, the capacitor has a stable capacitance and a long life span.
- the invention belongs to class H01G 4/22 of the International Patent Classification.
- a technical problem successfully solved by the present method and the design of the capacitor is an adequate protection of a metal polypropylene capacitor winding in order to protect its thin metallised coating that is sensitive to the presence of oxygen and air moisture from oxidation.
- the present invention relates to low-voltage power capacitors used for the improvement of power factor at low voltage as well as to engine capacitors and capacitors for fluorescence produced in MKP technology.
- capacitors used for these purposes consist of one or several capacitor elements.
- Each element consists of two top quality biaxially oriented polypropylene films serving as dielectric, onto which a thin layer of aluminium, zinc or a mixture thereof is vaporized under vacuum and serve as capacitor electrodes. Both electrodes are contacted on the front side of a capacitor element via thicker layer, onto which pins are soldered.
- the subject of the invention is a method for protecting a capacitor winding made of a metallised plastic film with epoxy resin, wherein the winding is first dried in vacuum at an increased temperature, impregnated with a liquid epoxide and then drained.
- the capacitor the cross-section of which is shown in Figure 1 , has a housing 1 , in which a lower insulation insert 2 and an upper insulation insert 3 are arranged with a capacitor winding 4 therebetween.
- An electric connection 5, 6 is soldered between soldering spots 8, 11 and coated with insulation 7.
- the top of the capacitor is closed by a sealing plate 9.
- a discharge resistance 10 is connected between the soldering spots 8 and 1 1 .
- Capacitor windings 4 are protected by a method for protecting a capacitor winding made of a metallised plastic film with epoxy resin of the invention, in that capacitor windings 4 are first arranged into specially prepared baskets adapted to be inserted into impregnation boilers. The windings so arranged are inserted into boilers and hermetically closed. A boiler must withstand high vacuum and be well sealed.
- the windings are dried at an increased temperature from 40 to 120 °C until all moisture is removed from the windings and the boiler, which usually takes from 24 to 48 hours. Vacuuming time depends on the size of the boiler and the number of windings contained therein, of the power of vacuum pumps and the level of moisture. Epoxide coating should be previously prepared in a tank in a way to reach the same temperature as the windings, it should not contain any moisture and other not allowed admixtures.
- Epoxide coating thus prepared is slowly poured into the boiler containing the windings, until it reaches approx. 5 cm above the windings.
- the windings thus immersed are vacuumed for a couple of hours, thereafter air is let into the boiler, the coating is pumped into the tank, the boiler is opened and the basket with impregnated windings lifted and drained for 1 hour.
- Polymerisation of the epoxide that remains on the capacitor windings 4 is carried out in ovens at a temperature exceeding 100 0 C until the epoxide hardens.
- the capacitor windings 4 thus treated are conventionally hermetically closed.
- the method for protecting a capacitor winding made of a metallised plastic film with epoxy resin of the invention successfully solves the set technical problem and provides for a possibility to extrude air from the front sides of the winding thus preventing moisture from getting between the windings and oxidation of the thin metallised layer sensitive to the presence of oxygen and moisture.
- the number of partial discharges is smaller, which prevents the capacitor from losing its capacitance in its life span.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The subject of the invention is a method for protecting a capacitor winding made of a metallised plastic film with an epoxy resin. An impregnation method, in which a capacitor winding (4) is first dried in vacuum at an increased temperature, impregnated by a liquid epoxide and then drained makes it possible to produce a capacitor, in which the environmental influence is excluded. As a consequence, the capacitor has a stable capacitance and a long life span.
Description
METHOD FOR PROTECTING A CAPACITOR WINDING WITH EPOXY
RESIN
The subject of the invention is a method for protecting a capacitor winding made of a metallised plastic film with an epoxy resin. An impregnation method, in which a winding is first dried in vacuum at an increased temperature, impregnated with a liquid epoxide and then drained, makes it possible to produce a capacitor, in which the environmental influence is excluded. As a consequence, the capacitor has a stable capacitance and a long life span. The invention belongs to class H01G 4/22 of the International Patent Classification.
A technical problem successfully solved by the present method and the design of the capacitor is an adequate protection of a metal polypropylene capacitor winding in order to protect its thin metallised coating that is sensitive to the presence of oxygen and air moisture from oxidation.
Environmental influences on the capacitor can be done away with by protecting capacitor windings. An adequate agent is used to prevent the thin metallised coating that is sensitive to the presence of oxygen and moisture from oxidation, thus reducing the number of partial discharges and thus a decrease in the capacitance of a capacitor in its life. There are mostly three known types of protecting a metal polypropylene capacitor winding, i.e. with biodegradable plant oil, by gas filling and by coating a
capacitor winding with epoxide. A drawback of protection by using biodegradable plant oil is high weight and a possibility of capacitor leakage. A disadvantage of gas filled capacitors is a possibility of gas leakage and a disadvantage of capacitors coated with epoxide is high capacitor's weight.
The present invention relates to low-voltage power capacitors used for the improvement of power factor at low voltage as well as to engine capacitors and capacitors for fluorescence produced in MKP technology.
It is commonly known that capacitors used for these purposes consist of one or several capacitor elements. Each element consists of two top quality biaxially oriented polypropylene films serving as dielectric, onto which a thin layer of aluminium, zinc or a mixture thereof is vaporized under vacuum and serve as capacitor electrodes. Both electrodes are contacted on the front side of a capacitor element via thicker layer, onto which pins are soldered.
It is also common knowledge that there are huge problems with the stability of the thin vaporized capacitor coatings. The main reasons for poor stability are moisture and air. Since the very beginning of the MKP technology much attention has been paid to the elimination of these two main reasons for a poor quality of capacitors and their short life span.
Coating with epoxy filling, plant oil based resin and a use of a neutral N2 insulation gas proved to be of best quality and most practical among the protection technologies used. All these technologies more or less
ensure a minimum change in capacitance during the entire life span of a capacitor and a long life of a capacitor.
A possibility of protecting a capacitor winding with a dielectric fluid containing acetoxystearate is disclosed in the US patent specification US 4,609,969. This type of protection of a capacitor winding leaves a possibility of capacitor leakage in case its coating is damaged and consequently leads to capacitor breakdown.
The subject of the invention is a method for protecting a capacitor winding made of a metallised plastic film with epoxy resin, wherein the winding is first dried in vacuum at an increased temperature, impregnated with a liquid epoxide and then drained.
The invention will be described in more detail by way of an embodiment and Figure 1 , which shows a cross-section of the capacitor.
The capacitor, the cross-section of which is shown in Figure 1 , has a housing 1 , in which a lower insulation insert 2 and an upper insulation insert 3 are arranged with a capacitor winding 4 therebetween. An electric connection 5, 6 is soldered between soldering spots 8, 11 and coated with insulation 7. The top of the capacitor is closed by a sealing plate 9. A discharge resistance 10 is connected between the soldering spots 8 and 1 1 .
Capacitor windings 4 are protected by a method for protecting a capacitor winding made of a metallised plastic film with epoxy resin of the invention, in that capacitor windings 4 are first arranged into specially
prepared baskets adapted to be inserted into impregnation boilers. The windings so arranged are inserted into boilers and hermetically closed. A boiler must withstand high vacuum and be well sealed.
Then follows a method of drying under vacuum. The windings are dried at an increased temperature from 40 to 120 °C until all moisture is removed from the windings and the boiler, which usually takes from 24 to 48 hours. Vacuuming time depends on the size of the boiler and the number of windings contained therein, of the power of vacuum pumps and the level of moisture. Epoxide coating should be previously prepared in a tank in a way to reach the same temperature as the windings, it should not contain any moisture and other not allowed admixtures.
Epoxide coating thus prepared is slowly poured into the boiler containing the windings, until it reaches approx. 5 cm above the windings. The windings thus immersed are vacuumed for a couple of hours, thereafter air is let into the boiler, the coating is pumped into the tank, the boiler is opened and the basket with impregnated windings lifted and drained for 1 hour.
Polymerisation of the epoxide that remains on the capacitor windings 4 is carried out in ovens at a temperature exceeding 100 0C until the epoxide hardens.
The capacitor windings 4 thus treated are conventionally hermetically closed.
The method for protecting a capacitor winding made of a metallised plastic film with epoxy resin of the invention successfully solves the set technical problem and provides for a possibility to extrude air from the front sides of the winding thus preventing moisture from getting between the windings and oxidation of the thin metallised layer sensitive to the presence of oxygen and moisture. Moreover, the number of partial discharges is smaller, which prevents the capacitor from losing its capacitance in its life span.
Claims
1. Method for protecting a capacitor winding with epoxy resin, characterized in that a capacitor winding (4) is first dried in vacuum at an increased temperature and then impregnated with liquid epoxide and drained.
2. Method for protecting a capacitor winding with epoxy resin as claimed in claim 1 , characterized in that the increased temperature ranges from 40 to 120 0C normally for 24 to 48 hours and that the vacuuming time also depends on the size of the boiler and the number of windings (4) contained therein, of the power of vacuum pumps and the moisture level.
3. Method for protecting a capacitor winding with epoxy resin as claimed in claim 1 and 2, characterized in that impregnation with epoxide coating is performed in a way that the coating is slowly poured into the boiler containing capacitor windings (4) until it reaches approx. 5 cm above the level of capacitor windings (4) and the capacitor windings (4) so covered are vacuumed for a couple of hours, then air is left into the boiler, the coating is pumped to a tank, the boiler is opened, the basket with the impregnated capacitor windings (4) is lifted and drained for 1 hour, wherein polymerisation of the epoxide remaining on the capacitor windings (4) is performed in ovens at a temperature exceeding 100 0C until the epoxide hardens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SIP-200900168 | 2009-06-19 | ||
| SI200900168A SI23086A (en) | 2009-06-19 | 2009-06-19 | Procedure of protection of capacitor coil with epoxy resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010147562A1 true WO2010147562A1 (en) | 2010-12-23 |
Family
ID=43126968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SI2010/000037 WO2010147562A1 (en) | 2009-06-19 | 2010-06-18 | Method of protection condenser roll with epoxy resin |
Country Status (2)
| Country | Link |
|---|---|
| SI (1) | SI23086A (en) |
| WO (1) | WO2010147562A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910636A (en) * | 2017-04-28 | 2017-06-30 | 苏州松控电子科技有限公司 | A kind of high-performance electric electrolysis condenser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3649892A (en) * | 1970-07-13 | 1972-03-14 | Mallory & Co Inc P R | Capacitors utilizing bonded discrete polymeric film dielectrics |
| US4348712A (en) * | 1978-10-18 | 1982-09-07 | General Electric Company | Capacitor with embossed electrodes |
| US4609969A (en) | 1984-10-22 | 1986-09-02 | Emhart Industries, Inc. | Dielectric fluid for metallized polypropylene film capacitors |
| EP1253608A1 (en) * | 2000-03-30 | 2002-10-30 | Evox Rifa Aktiebolag | Method for making impregnated electrical compontents |
-
2009
- 2009-06-19 SI SI200900168A patent/SI23086A/en not_active IP Right Cessation
-
2010
- 2010-06-18 WO PCT/SI2010/000037 patent/WO2010147562A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3649892A (en) * | 1970-07-13 | 1972-03-14 | Mallory & Co Inc P R | Capacitors utilizing bonded discrete polymeric film dielectrics |
| US4348712A (en) * | 1978-10-18 | 1982-09-07 | General Electric Company | Capacitor with embossed electrodes |
| US4609969A (en) | 1984-10-22 | 1986-09-02 | Emhart Industries, Inc. | Dielectric fluid for metallized polypropylene film capacitors |
| EP1253608A1 (en) * | 2000-03-30 | 2002-10-30 | Evox Rifa Aktiebolag | Method for making impregnated electrical compontents |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910636A (en) * | 2017-04-28 | 2017-06-30 | 苏州松控电子科技有限公司 | A kind of high-performance electric electrolysis condenser |
Also Published As
| Publication number | Publication date |
|---|---|
| SI23086A (en) | 2010-12-31 |
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