JP4845217B2 - High-voltage metal-deposited electrode oil-filled capacitor - Google Patents

Description

  The present invention relates to a film in which a metal vapor deposition film is provided on both surfaces of a polyethylene terephthalate film (hereinafter referred to as PET film) or a polypropylene film (hereinafter referred to as PP film), and a PP film in which the metal vapor deposition film is not provided on the surface. The present invention relates to a high voltage metal vapor deposition electrode oil-filled capacitor in which a capacitor element formed by winding together is impregnated with an insulating oil.

As an oil-filled capacitor, generally a metallized film capacitor (Patent Document 1) in which a metallized film is wound, or a metallized paper electrode in which a double-sided metallized paper electrode and a PP film are wound as shown in FIG. There is a capacitor (Patent Document 2).
Each of these capacitors uses a vapor deposition electrode as an electrode and a plastic film as a dielectric, employs a serial vapor deposition electrode, and connects the elements in series to form a high voltage capacitor.

Japanese Utility Model Publication No. 51-128233 Japanese Patent Laid-Open No. 52-062650

However, the metallized film capacitor has a problem that since the impregnation property of the insulating oil is poor, the partial discharge start voltage is low, the characteristic change such as capacity reduction during energization is large, and the reliability is lacking.
In addition, since the metallized paper electrode capacitor uses a metallized paper electrode, the impregnation property of the insulating oil is good. However, the surface protrusion of the metallized paper electrode has an effect and tan δ is high, resulting in stable characteristics. Had the problem of lacking.

  The present invention solves the problems in the above-described conventional oil-filled capacitors, improves impregnation and stabilizes tan δ, stabilizes the partial discharge start voltage, and has a high voltage with stable durability. An object is to provide a metal-deposited electrode oil-filled capacitor.

The high-voltage metal-deposited electrode oil-filled capacitor of the present invention capable of solving the above-mentioned problems is a film in which a metal vapor-deposited film is provided on both sides of a PET film or PP film, and a PP film in which no metal vapor-deposited film is provided on the surface A capacitor having a structure in which a plurality of capacitor elements that draw electrodes from both end faces wound through the metallicon part are housed in an outer case,
The film provided with the metal vapor deposition film has a surface centerline average roughness of 0.5 to 1.5 μm, and the resistance value of the metal vapor deposition film in the vicinity of the metallicon metal constituting the metallicon part. Is 2.0 to 10.0 Ω / □, and the resistance value of the metal vapor deposition film in the portion that contributes to the capacitance other than the vicinity is 5.0 to 20.0 Ω / □, and the metal vapor deposition film is provided. The PP film that has not been subjected to heat treatment at 120 ± 1 ° C. for 15 minutes has a thermal shrinkage in the width direction of 0.5 to 2.0%, and the center line average roughness of at least one side of the PP film is It is 1.0-3.0 micrometers, The said capacitor | condenser element is impregnated with insulating oil, and is accommodated in the said exterior case, It is characterized by the above-mentioned.

In the present invention, both surfaces of the PET film or PP film are appropriately roughened to provide a metal vapor deposition film, thereby improving impregnation and stabilizing tan δ, and no metal vapor deposition film is provided. By defining the thermal shrinkage rate and surface roughness in the width direction of the PP film, it is possible to stabilize the partial discharge start voltage, and by stabilizing the vapor deposition film resistance value as described above, it is possible to stabilize the durability. Can be planned.
From the above, it is possible to produce a high-quality metal-deposited electrode oil-filled capacitor with high quality and stable characteristics.

The best mode of the high voltage metal deposition electrode oil-filled capacitor of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing the configuration of electrodes and dielectrics in a high-voltage metal-deposited electrode oil-filled capacitor according to the present invention, FIG. 2 is a diagram showing a capacitor element, and FIG. It is a figure which shows the structure of the high voltage vapor deposition electrode oil-filled type | mold capacitor | condenser of this invention accommodated in the inside.

The capacitor element in the high-voltage metal-deposited electrode oil-filled capacitor of the present invention is a metal (generally aluminum) vapor-deposited on both sides of a PET film or PP film whose surfaces are roughened as shown in FIG. The double-sided vapor deposition electrode 3 provided with the metal vapor deposition film 2 and the PP film 4 not provided with the metal vapor deposition film and roughened at least on one side are wound in an overlapping state. Has been.
And in this invention, the average roughness of the surface of the PET film 1 which comprises the said capacitor | condenser element is 0.5-1.5 micrometers, The metal vapor deposition film of the vicinity part which contacts the metallicon metal which comprises the metallicon part 2 so that the resistance value of the metal vapor deposition film 2 in the portion contributing to the electrostatic capacity other than the vicinity portion is 5.0 to 20.0 Ω / □. The thickness of the metal vapor deposition film near the metallicon part is increased, and the thickness of the metal vapor deposition film other than the vicinity is reduced.
And PP film 4 in which the metal vapor deposition film is not provided is 0.5-2.0% in the thermal contraction rate (measured according to JIS C 2330) of the width direction after heat-processing for 15 minutes at 120 +/- 1 degreeC. The average roughness of at least one side of the PP film is 1.0 to 3.0 μm.
The “average roughness” used in the specification of the present application refers to the centerline average roughness (Ra) measured based on JIS B 0601, and “the resistance value of the metal vapor deposition film in the capacitance contribution portion”. "Means the resistance value of the metal deposition film on the portion 16 (Fig. 5) that contributes to the capacitance other than the vicinity of the metallicon portion of the PET film 1 constituting the capacitor element. “The resistance value of the metal vapor deposition film of the portion” means the resistance value of the metal vapor deposition film of the thick portion 17 (FIG. 5) in the vicinity of the metallicon portion of the PET film 1 constituting the capacitor element. And in this invention, it can replace with the said PET film and can also utilize PP film.

  Furthermore, in the present invention, the PET film or PP film provided with the metal vapor deposition film on both front and back surfaces overlapped with the PP film having at least one surface roughened and not provided with the metal vapor deposition film. As shown in FIG. 2, the metallicon metal is sprayed on both end faces of the capacitor element wound in a state to form a metallicon portion 5, and an extraction electrode 7 is connected to the metallicon portion 5. Element 6 is formed.

As shown in FIG. 3, the high-voltage metal-deposited electrode oil-filled capacitor of the present invention has a plurality of capacitor elements of FIG. 2 fastened and fixed to form a capacitor unit 8, and the lead electrode 7 of each capacitor element is connected to a lead wire. 11, after being stored in the outer case 9, connected to the external terminal 10 with the lead wire 11, dried at high temperature and vacuum, then impregnated with insulating oil 12 at a high temperature, and sealed the outer case 9 Manufactured.
EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[Examples 1-1, 1-5, 1-9, Comparative Examples 1-1, 1-6] Comparison of PET Film Surface Roughness With the electrode and dielectric configuration shown in FIG. Capacitance contribution for each of five types of surface-roughened PET films 1 (see Table 1 below) of 310 mm and average roughness of 0.25, 0.5, 1.0, 1.5, and 2.0 μm A vapor-deposited metal 2 having a vapor-deposited film resistance value of 10.0 Ω / □ at a portion and a vapor-deposited film resistance value of 5.0 Ω / □ at a portion in contact with the metallicon metal was vapor-deposited to obtain a double-side vapor-deposited PET electrode 3.
The double-sided vapor-deposited PET electrode 3 and a rough surface PP not provided with a metal vapor-deposited film having a thickness of 20 μm, a width of 300 mm, a thermal shrinkage in the width direction at 120 ° C. of 1.5%, and an average roughness of 1.5 μm. The film 4 was wound in an overlapping state to form a winding element.
Metallicon metal 5 is sprayed on both end faces of the winding element to form the metallicon part 5, and the extraction electrode 7 is connected to the metallicon part 5 to obtain the capacitor element 6 shown in FIG. The capacitor unit 8 is fixed by tightening a plurality of parts, housed in the outer case 9, connected to the external terminals 10 and the lead wires 11, dried at high temperature and vacuum, impregnated with insulating oil 12 at high temperature, and sealed. The high voltage vapor deposition electrode oil-filled capacitor of the present invention was obtained.
The capacitor had a capacitance of 30 μF, and five capacitors were produced.

(Comparative Example 2-1) Comparison between PP film and metallized paper With the electrode and dielectric configuration shown in FIG. 4, the deposited metal 2 was deposited on the capacitor paper 13 having a thickness of 9 μm, a width of 310 mm, and an average roughness of 2.5 μm. A double-sided vapor-deposited electrode paper 14 obtained by vapor-depositing and a PP film 15 (thickness 22 μm, average roughness 0.2, 1.5 μm, heat shrinkage 1.5%) not provided with a metal vapor-deposited film; Were wound in an overlapping state to form a wound element.
Metallicon metal 5 is sprayed on both end faces of the winding element to form the metallicon part 5, and the extraction electrode 7 is connected to the metallicon part 5 to obtain the capacitor element 6 shown in FIG. The capacitor unit 8 is fastened and fixed in a plurality of units, housed in the outer case 9, connected by the external terminal 10 and the internal lead terminal 11, dried at high temperature and vacuum, then impregnated with insulating oil 12 at high temperature and sealed. Thus, a high voltage vapor deposition electrode oil-filled capacitor (conventional product) was obtained.
Here, the capacitance of the capacitor was 30 μF, and five capacitors were produced.

As test conditions, a tan δ of a 20 ° C. rated voltage, a 20 ° C. rated voltage × 2 times, and a 1 minute withstand voltage test were performed, and then a partial discharge start voltage and an AC breakdown voltage were measured.
The test results are shown in Table 1 below. In addition, the judgment criteria of pass / fail in comprehensive evaluation are tan δ value of 0.05% or less, partial discharge start voltage (magnification with respect to rated voltage): 1.5 or more, and AC breakdown voltage (magnification with respect to rated voltage): 3.0 or more In addition, when all the conditions of the element winding evaluation “◯” are satisfied, “◯” is indicated, and when not satisfied, “×” is indicated.

As is apparent from the test results in Table 1, in the conventional product (metallized paper electrode capacitor) (Comparative Example 2-1), the average roughness of the double-sided vapor-deposited electrode paper is large, so the tan δ value is 7. The value is 2 to 7.7 times higher and the stability of the characteristics is lacking.
In contrast, in the case of a high voltage vapor deposition electrode oil-filled capacitor using a double-sided vapor deposition electrode, the tan δ value is stable when the average roughness of the PET film is 1.5 μm or less, but exceeds this value. Since the average roughness is large and the minute partial discharge increases, the tan δ value becomes a high value of 3.8 to 3.9 times (Comparative Example 1-6), and the stability of characteristics is lacking.

In addition, after the withstand voltage test at 20 ° C., the partial discharge start voltage and the AC breakdown voltage were measured. As a result, when the average roughness of the PET film was 0.5 μm or more, the amount of the impregnating agent was large. Even if this occurs, the gas at this time is absorbed by the impregnating agent, so that the partial discharge start voltage and the AC breakdown voltage after the test are stable.
On the other hand, when the average roughness of the PET film is less than 0.5 μm, the gas generated in the partial discharge during the withstand voltage test is not sufficiently absorbed by the impregnating agent, so the gas absorbency during the partial discharge is inferior, and the partial discharge Since the starting voltage and the AC breakdown voltage are lowered, it is not preferable.

[Examples 1-3 to 1-6, Comparative Examples 1-3, 1-4] Comparison of heat shrinkage rates of PP film With the electrode and dielectric structure shown in FIG. A roughened PET film 1 having a roughness of 1.0 μm has a deposited film resistance value of 10.0 Ω / □ at a capacitance-contributing portion and a deposited film resistance value of 5.0 Ω / □ at a portion in contact with the metallicon metal. Double-sided metallized PET film 3 on which vapor-deposited metal 2 is vapor-deposited, and the thermal shrinkage in the width direction at a thickness of 20 μm, a width of 300 mm, and 120 ° C. is 0.25, 0.5, 1.0, 1.5, 2. A capacitor element was formed by winding the surface-roughened PP film 4 having no metal vapor deposition film of 0, 2.5% and an average roughness of 1.5 μm in an overlapping state.
Thereafter, a capacitor sample was produced in the same procedure as in Example 1-5.

The partial discharge start voltage and AC breakdown voltage were measured under the same test conditions as in Example 1-5, and the same evaluation was performed.
The results are shown in Table 1.

As apparent from the test results in Table 1, when the heat shrinkage ratio of the roughened PP film 4 not provided with the metal vapor deposition film is 2.0% or less, the heat shrinkage ratio of the PP film is low. Since shrinkage is reduced and the amount of impregnating agent between the electrode and PP film is secured, the gas generated by partial discharge in the withstand voltage test is absorbed by the impregnating agent, and the partial discharge starting voltage and AC breakdown voltage after the test are stable. is doing.
However, when the thermal contraction rate of the roughened PP film 4 not provided with the metal vapor deposition film is excessively small (when the thermal contraction rate is 0.25%), the PP film not provided with the metal vapor deposition film is applied. Since the heat treatment temperature becomes high, curling phenomenon of the slit end face of the PP film occurs and wrinkles are generated when the element is wound. Therefore, the thermal contraction rate in the width direction at 120 ° C. is preferably 0.5% or more.

[Examples 1-2, 1-5, 1-7, 1-8, Comparative Examples 1-2, 1-5] Comparison of PP film average roughness Thickness in the electrode and dielectric configuration shown in FIG. A roughened PET film 1 having a thickness of 9 μm, a width of 310 mm, and an average roughness of 1.0 μm, a vapor deposition film resistance value of 10.0 Ω / □ at a capacitance-contributing portion, and a vapor deposition film resistance value of a neighboring portion in contact with the metallicon metal Double-sided metallized PET film 3 deposited with a deposited metal 2 of 5.0 Ω / □, a thickness of 20 μm, a width of 300 mm, a thermal shrinkage in the width direction at 120 ° C. of 1.5%, and an average roughness of 0.1. A capacitor element is formed by winding a roughened PP film 4 not provided with a metal deposited film of 5, 1.0, 1.5, 2.0, 3.0, 4.0 μm in an overlapping state. did.
Thereafter, a capacitor sample was produced in the same procedure as in Example 1-5.

The partial discharge start voltage and the AC breakdown voltage were measured under the same test conditions as in Example 1-5, and the same evaluation was performed.
The results are shown in Table 1.

As is clear from the test results in Table 1, when the average roughness of the roughened PP film 4 not provided with the metal vapor deposition film is 1.0 to 3.0 μm, the electrode and the metal vapor deposition film are not provided. Since the amount of the impregnating agent between the PP films is secured, the gas generated by the partial discharge in the withstand voltage test is absorbed by the impregnating agent, and the partial discharge starting voltage and the AC breakdown voltage after the test are stable.
However, when the average roughness of the roughened PP film 4 not provided with the metal vapor-deposited film is small (average roughness is 0.5 μm), the gas absorptivity at the time of partial discharge is inferior due to the withstand voltage test. This is not preferable because the discharge start voltage and the AC breakdown voltage are lowered.
Further, if the surface roughness of the roughened PP film not provided with the metal vapor deposition film exceeds 3.0 μm, the thickness variation of the PP film is enlarged and the breakdown voltage is lowered, which is not preferable.

[Examples 1-10 to 1-14, Comparative Examples 1-7 to 1-10] Comparison of Deposition Film Resistance Values 9 μm in thickness, 310 mm in width, and average roughness in the electrode and dielectric configuration shown in FIG. Is deposited on the roughened PET film 1 having a thickness of 1.0 μm, and the resistance value of the deposited film is 3.0, 5.0, 10.0, 15.0, 20.0 25.0 Ω / □, double-sided metallized PET film 3 having a deposited film resistance value of 1.0, 2.0, 5.0, 10.0, 13.0 Ω / □ in the vicinity of the metallicon metal, Wrapped in a state of being overlapped with a roughened PP film 4 having a thickness of 20 μm, a width of 300 mm, a thermal shrinkage of 1.5% in the width direction at 120 ° C., and an average roughness of 1.5 μm, which is not provided with a metal vapor deposition film. Turned to form a capacitor element.
Thereafter, a capacitor sample was produced in the same procedure as in Example 1-5.

As test conditions, a rated voltage × 1.4 times the voltage was applied for 2000 hours at room temperature, and the change in capacitance and the change in tan δ value were measured.
The results are shown in Table 2. In addition, the judgment criteria of pass / fail were “◯” when the capacitance change rate was −5% or less and tan δ was 0.05% or less, and “X” when it was not satisfied.

From the test results in Table 2, when the film resistance value in the vicinity of the metallicon part of the vapor deposition electrode is 5.0Ω / □ and the film resistance value of the capacitance contributing part is 5.0 to 20.0Ω / □, 2000 hours In the current test, the capacitance change rate and tan δ change are small and good (Examples 1-5, 1-11 to 1-13). However, when the film resistance value of the capacitance contributing part exceeds 20Ω, It is not preferable because the capacitance decrease due to the film receding at the deposition end is increased due to the influence of the minute partial discharge (Comparative Example 1-9).
On the other hand, when the film resistance value of the electrostatic capacity contributing portion is less than 5.0Ω / □, the deposited film is greatly scattered at the time of local breakdown of the dielectric, and the electrostatic capacity decrease is increased.

When the membrane resistance value of the capacitance contributing portion is 10.0 Ω / □ and the membrane resistance value near the metallicon is 2.0-10.0 Ω / □, the change rate of capacitance and the change in tan δ are observed in a 2000 hour energization test. Although it is small and good (Examples 1-10, 1-5, 1-14), when the film resistance value near the metallicon exceeds 10.0Ω / □, the contact state of the joint with the metallicon is caused by the current during energization. It decreases and tan δ increases (Comparative Example 1-10).
On the other hand, if the film resistance value near the metallicon part is less than 2Ω / □, the film thickness of this part is so thick that the film is likely to be deformed due to the heat during vapor deposition. This is not preferable because the contact state of the joint portion decreases and tan δ increases (Comparative Example 1-7).

From the above test results, in the high voltage metal vapor deposition electrode oil-filled capacitor of the present invention, by appropriately roughening the surface of the PET film, improvement of impregnation and stabilization of tan δ can be achieved, Moreover, by regulating the thermal contraction rate and surface roughness in the width direction of the PP film not provided with the metal vapor deposition film, the partial discharge start voltage can be stabilized, and by defining the vapor deposition film resistance value It was confirmed that the durability could be stabilized.
In addition, in the said Example, said effect was acquired by roughening the surface of PET film, However Even if it replaces with PET film and uses PP film, the same effect can be acquired.

It is a figure which shows the structure of the electrode and dielectric material in the high voltage metal vapor deposition electrode oil-filled type capacitor of this invention. It is a figure showing a capacitor element in the present invention. It is a figure which shows the structure of the high voltage vapor deposition electrode oil-filled type | mold capacitor | condenser of this invention with which the capacitor | condenser element was accommodated in the exterior case. It is a figure which shows the structure of the conventional electrode described in the said patent document 2, and a dielectric material. It is sectional drawing of the PET film or PP film in which the metal vapor deposition film was provided in both surfaces which comprise a capacitor | condenser element, and the PP film in which the metal vapor deposition film was not provided in the surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roughening PET film 2 Metal vapor deposition film 3 Double-sided vapor deposition electrode 4 Roughening PP film 5 Metallicon part 6 Capacitor element 7 Lead electrode 8 Capacitor unit 9 Exterior case 10 External terminal 11 Lead wire 12 Insulating oil 13 Capacitor paper 14 Double-sided vapor deposition Electrode paper 15 PP film 16 Portion 17 contributing to electrostatic capacity Thick portion

Claims (1)

After winding a film with a metal vapor-deposited film on both sides of a polyethylene terephthalate film or a polypropylene film and a polypropylene film without a metal vapor-deposited film on the surface, an electrode is passed through the metallicon part from the wound both end faces A capacitor having a structure in which a plurality of capacitor elements for drawing out are housed in an outer case,
The film provided with the metal deposition film has a surface centerline average roughness of 0.5 to 1.5 μm,
The resistance value of the metal vapor deposition film in the vicinity of the metallicon metal constituting the metallicon part is 2.0 to 10.0Ω / □,
The resistance value of the metal vapor deposition film in the capacitance contribution portion other than the vicinity portion is 5.0 to 20.0 Ω / □,
The polypropylene film not provided with the metal vapor deposition film has a heat shrinkage in the width direction of 0.5 to 2.0% after being heat-treated at 120 ± 1 ° C. for 15 minutes,
The center line average roughness of at least one side of the polypropylene film not provided with the metal vapor deposition film is 1.0 to 3.0 μm,
A high-voltage metal-deposited electrode oil-filled capacitor, wherein the capacitor element is impregnated with insulating oil and stored in the outer case.

Images