JP2000182885A - Capacitor for electric power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a capacitor element holding structure, while ensuring insulation between capacitor elements constituting a capacitor for power to reduce assembly work, as well as improve operatability in connection between capacitor elements and lead wiring. SOLUTION: Flat capacitor elements 1 are each constituted by alternately laminating and winding an electrode foil and a dielectric film with the side end parts of the electrode foil projected from the side end part of the dielectric film and is housed in a case together with insulating oil. There is also provided an insulation reinforcing plate 2, of which the upper, lower, right and left sides are wider than those of the capacitor element 1. The side end parts of the capacitor element 1 are positioned in the lateral direction, and a plurality of the capacitor elements 1 are connected in parallel and laminated in the horizontal direction. A pair of insulation reinforcing plates 2 are positioned at both ends of the laminate and tightened by insulation binding bands 3 to form a unit 4. A plurality of units 4 are laminated in the horizontal direction, tightened and integrated by a pair of tightening plates 5 and tightening studs 14 to form an element block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power capacitor.

[0002]

2. Description of the Related Art A capacitor element using an aluminum electrode foil is formed by projecting an aluminum electrode foil such as aluminum from a side edge of a dielectric film such as polypropylene and alternately overlapping and winding the two. Yes, it is called a foil extension type capacitor element.

As shown in FIG. 4, a foil extension type capacitor element 1 has a pair of dielectric films 11 and aluminum electrode foils 10a and 10b alternately stacked, and a first aluminum electrode foil 10a is After the second aluminum electrode foil 10b is projected and wound on the other side in the width direction of the dielectric film 11,
It is formed as a flat.

The electrode ends 12a and 12b of the capacitor element 1 formed as described above are very soft because they are formed of aluminum foil, so that the electrode ends 12a and 12b are very soft.
2b may be irregular in each element, and may be broken or damaged. In particular, the electrode ends 12a, 12
When b is arranged in the vertical direction, it is necessary to consider a lower structure supporting the capacitor element 1.

As one measure for solving the problem, in the conventional power capacitor, an element structure is shown in FIG. 5, and an element block structure in which the elements are assembled is shown in FIG. A core 8 is inserted into the center, and the core 8 has a dimension equal to or greater than the distance between the side edges of the capacitor element 1. The capacitor element 1 was supported by the block support 9. Also, a plurality of capacitor elements 1 are stacked in the horizontal direction, and tightened and integrated by the tightening plate 5 and the tightening studs 14 to form the element block 6.

A large-capacity power capacitor used at a high voltage is composed of a plurality of capacitor elements, and these capacitor elements are connected in series and parallel so as to have a required voltage and capacity. As shown in FIG. 7, in order to connect adjacent capacitor elements 1 in series, one electrode end 12a of a pair of electrode ends is connected to each other.
Since a potential difference occurs between the other electrode ends 12b,
In order to ensure electrical insulation, an insulating reinforcing plate 2 is inserted between adjacent capacitor elements connected in series.

On the other hand, in FIG. 6, after the capacitor elements 1 are assembled to form the element block 6, the connection between the above-mentioned capacitor elements and the lead-out wiring are performed. To do this, it was necessary to invert or roll over the element block.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention simplifies the supporting structure of the capacitor elements while ensuring insulation between the capacitor elements constituting the power capacitor, reduces the assembling work, and reduces the connection between the capacitor elements. The purpose is to improve the workability of the lead wiring.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a flat capacitor element is formed by projecting a side edge of an electrode foil from a side edge of a dielectric film and winding the electrode foil and the dielectric film alternately on top of each other. However, in the power capacitor housed in the case together with the insulating oil, the power capacitor has an insulating reinforcing plate wider in the vertical and horizontal directions than the capacitor element, and the capacitor element has a side edge located in the horizontal direction and the number of parallel connection in the horizontal direction. A unit is formed by stacking and arranging a pair of the insulating reinforcing plates at both ends of the stack and tightening with an insulating binding band, and a plurality of the units are stacked in a horizontal direction to form a pair of a tightening plate and a tightening stud. To form an element block.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram showing an example of an element block according to the present invention. FIG. 2 is a structural diagram showing a unit composed of the capacitor element and the insulating reinforcing plate in FIG. FIG. 3 is a structural view of a unit showing another embodiment example different from FIG.

In FIG. 2, a capacitor element 1 is a flat-type foil extension type in which a side edge of an electrode foil projects beyond a side edge of a dielectric film, and the electrode foil and the dielectric film are alternately stacked and wound. The capacitor element 1 has a side edge portion located in the horizontal direction and is connected in parallel in the horizontal direction. The capacitor element 1 has a pair of capacitor elements 1 at both ends.
A unit 4 is formed by arranging wider insulating reinforcing plates 2 in the upper, lower, left and right directions and tightening them with an insulating binding band 3. In the insulating reinforcing plate 2, band through holes 15 are provided at the same interval as the width in the direction perpendicular to the electrode end direction of the capacitor element 1.

As shown in FIG. 7, when two units 4 are connected in series, one electrode end of a pair of electrode ends of the unit 4 is connected to have the same potential, and both units 4 are connected.
It is not necessary to ensure insulation between the connection-side electrode ends of
A part of the insulating reinforcing plate 2 forming the unit 4 on the side of the electrode end connected in series is partially notched so as to facilitate connection with the electrode of the adjacent unit. Then, as shown in FIG. 1, a plurality of units 4 tightened by the insulating reinforcing plate 2 are further gathered in a horizontal direction, and tightened and integrated by a pair of tightening plates 5 and tightening studs 14, thereby obtaining an element. Block 6 is shown.

Since the insulation reinforcing plate 2 constituting the unit 4 only needs to ensure the insulation of the electrode end of the capacitor element, as shown in FIG. Notches are provided on the upper and lower sides so as to allow the insulating binding band 3 to pass therethrough so as to have the same width as the width in the direction perpendicular to the part direction, and a portion that must ensure insulation in contact with the electrode end of the capacitor element 1 Only the capacitor element 1 has a shape that is wider in the vertical and horizontal directions.

[0014]

As described above, in the present invention, a plurality of capacitor elements are sandwiched by insulating reinforcing plates which are wider in the vertical and horizontal directions than the capacitor elements to form a unit, which is necessary for series connection. Insulation between the electrodes of adjacent capacitor elements is ensured. In addition, since the capacitor element and the insulating reinforcing plate are integrated by an insulating band, it is not necessary to use an insulating reinforcing plate only for fixing the capacitor element, and the number of parts in manufacturing the element block is reduced. The assembly work can be reduced.

In addition to the above, since the capacitor element is supported by the insulating binding band at the edge of the capacitor element perpendicular to the direction of the electrode end, which is weak in strength, damage to the electrode end can be prevented. In addition, since the end portions of the electrodes are left and right, connection between the units and lead-out wiring from the element block can be easily performed, and the assembling work can be reduced.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an element block showing an embodiment of the present invention.

FIG. 2 is a structural diagram showing a unit of FIG. 1;

FIG. 3 is a structural view of a unit showing another embodiment of the present invention.

FIG. 4 is a view showing the shape of a foil extension type capacitor element.

FIG. 5 is a structural view showing a conventional capacitor element.

FIG. 6 is a structural diagram showing an element block in which the elements of FIG. 5 are assembled.

FIG. 7 is a diagram showing a connection method between capacitor elements (units).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 capacitor element 2 insulating reinforcing plate 3 insulating binding band 4 unit 5 tightening plate 6 element block 7 connection line 8 core 9 block support 10 a, 10 b aluminum electrode foil 11 dielectric film 12 a, 12 b electrode end 13 a, 13 b insulation 14 Tightening stud 15 Band through hole

Claims (1)

[Claims] An electrode foil and a dielectric film are alternately overlapped and wound by projecting side edges of an electrode foil from side edges of a dielectric film, and a flat capacitor element is housed in a case together with insulating oil. Power capacitor
The capacitor element has insulating reinforcement plates wider than the capacitor element in the upper, lower, left and right directions.The capacitor elements are laterally positioned at the side edges and are connected in parallel in the number of parallel connections. A unit is formed by arranging and tightening with an insulating binding band, a plurality of the units are stacked in a horizontal direction, and an element block integrated by tightening with a pair of tightening plates and a tightening stud is formed. Power capacitor.