JPH07235444A - Capacitor - Google Patents

Abstract

PURPOSE:To provide a capacitor in which the tank for containing the capacitor can be made compact. CONSTITUTION:One or more capacitor elements is wrapped up along with lead wires 5 connected with the electrode lead-out parts thereof to form a unit capacitor 3 which is then contained in an open case 4 having an opening. A plurality of open cases 4 are contained in a tank 1 and the lead wires 5 are led out through the gap of an insulating wrapper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor having a large capacity by combining a plurality of unit capacitors.

[0002]

2. Description of the Related Art Conventionally, a large capacity single unit capacitor in which a plurality of unit capacitors are combined has the structure shown in FIG. That is, as shown in FIG. 5, this capacitor is provided with a unit capacitor bushing 24, and a plurality of unit capacitors 23 covered with a hermetically sealed case are housed in a tank 21. Bushing 24 for condenser and bushing 2 provided on the outer wall of the upper surface of tank 21
2 had a structure in which it was connected to a lead wire (not shown).

[0003]

However, the conventional example has the following drawbacks when the unit capacitor 23 is stored in the tank 21. That is, since the unit capacitor 23 is provided with the unit capacitor bushing 24, the unit capacitor 2
It was necessary to secure not only the body of No. 3 but also the space for the bushing 24 in the tank 21. Further, since each bushing 24 is exposed as a charging part, it is necessary to secure a space for insulation between the charging part and the tank 21. Furthermore, since the unit capacitor 23 is a closed case, the oil in the case expands due to heat generation of the capacitor element, etc., but it was necessary to secure a space in the tank 21 to cope with this expansion.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a capacitor capable of making a tank for accommodating a unit capacitor compact.

[0005]

Therefore, in the capacitor of the present invention, in a capacitor constituted by housing a plurality of unit capacitors 3 in a tank 1, at least one capacitor element 11 is connected to the electrode of the capacitor element 11 to lead it out. The unit capacitor 3 is formed by wrapping the lead wire 5 connected to the portion 15 with the insulating paper 16, and the unit capacitor 3 is housed in the open case 4 having an opening. In addition to being housed in the unit capacitor 1, the lead wire 5 that needs to be drawn out of the unit capacitor 3 is drawn out through the gap of the wrapping of the insulating paper 16, and the lead wire 5 of another unit capacitor 3 or the tank 1 It is characterized by being connected to a bushing 2 provided on the outer wall of the upper surface.

[0006]

As a result of the above, in the capacitor of the present invention, the lead wire 5 connected to the electrode lead-out portion 15 of the capacitor element 11 is directly connected to another unit capacitor 3 or the bushing 2. It is not necessary to secure a space in the tank 1 for the unit capacitor bushing 24 and a space for insulating the charging part from the tank 1. Unit capacitor 3
In the above, the electrode lead-out portion 15 of the capacitor element 11 and the connecting portion between the electrode lead-out portion 15 and the lead wire 5 are the insulating paper
Since it is covered with 6, it is not necessary to secure a space for insulating these from the tank 1.

Further, the capacitor element 11 in the unit capacitor 3 is not covered with the sealed case as in the conventional example, but is only wrapped with the insulating paper 16, and the unit capacitor 3 has an opening. Since it is housed in the open case 4, it is not necessary to secure a space in the tank 21 to deal with the bulge that occurs in the case of the conventional sealed case due to heat generation of the capacitor element 11 or the like.

[0008]

EXAMPLES Specific examples of the capacitor of the present invention will now be described in detail with reference to the drawings.

A capacitor for three-phase AC power according to an embodiment of the present invention has a structure shown in FIGS. That is, in a metal tank 1 having a rectangular parallelepiped shape, a total of 2
The four unit capacitors 3 are arranged and stored in two rows and two columns. The unit capacitor 3 is fixed to the tank 1 by accommodating the unit capacitor 3 in an open case 4 having an open top surface, fixing the open case 4 to a frame 6, and then fixing the frame 6 to the tank. It is carried out by fixing it to the top plate of 1. That is, the open case 4 is provided between the frame 6a having an L-shaped cross section provided in two steps on the frame 6 and the frame 6b having a U-shaped cross section extended in parallel to the central portion of the tank 1 in two steps. After fitting, the open case mounting bracket 7 having an L-shaped cross section provided on the side surface of the open case 4 is placed on the frameworks 6a and 6b, and both are fixed with bolts and nuts, and then in the tank 1. It is stored. Then, each lead wire 5 extending from each unit capacitor 3 is connected to the lead wire 5 extending from another unit capacitor 3 or the bushing 2 provided on the outer wall of the upper surface of the tank 1. Since this embodiment relates to a capacitor for three-phase AC power, it has three bushings 2.

The unit capacitor 3 is constructed as shown in FIG. That is, two capacitor elements 11 are connected in parallel by using the electrode lead-out portion 15, and one connected in parallel is 4
PP sheets (polypropylene) with the interlayer insulation paper 12 sandwiched between them and the press boards 13 adhered to both sides.
Secure with band 14. A pair of electrode lead-out portions 15 and 15 located in the central portion are connected in series by a lead wire 5, and the electrode lead-out portions 15 and 15 located on both sides are connected to other unit capacitors 3 or bushings 2. Install 5. The element body 17 constructed in this manner is wrapped with the electrode lead-out portion 15 and the lead wire 5 in the insulating paper 16 to form the unit capacitor 3.

FIG. 4 is a cross-sectional view of the open case 4 in a state where the unit capacitor 3 thus constructed is housed in the open case 4. Open case 4
The size of the unit is for storing the unit capacitor 3 and insulating paper 1.
It is necessary and sufficient to prevent the insulating paper 16 from being flipped over from the capacitor element 11 due to the insulating paper 16 being pressed by the inner wall of the open case 4 when the unit capacitor 3 wrapped with 6 is stored. . In other words, it is preferable that the element body 17 can be supported inside the side surface of the open case 4, and it is particularly desirable that the difference between the width of the element body 17 and the inside dimension of the case is within about several mm.

In the capacitor of this embodiment having the above structure, since the lead wire 5 connected to the electrode lead-out portion 15 of the capacitor element 11 is directly connected to another unit capacitor or the bushing 2, the unit capacitor 3 is connected. Does not require the unit capacitor bushing 24 used in the conventional example. Therefore, when housing the unit capacitor 3 in the tank 1, it is not necessary to secure a space for the bushing 24 in the conventional example in the tank 1.

A bushing 24 for the unit capacitor
Since it is unnecessary, it is not necessary to secure the insulating space required in the conventional example because it is exposed as the charging part. Further, the electrode lead-out portion 15 of the capacitor element 11 inside the unit capacitor 3 and the electrode lead-out portion 15
Since the connecting portion between the lead wire 5 and the lead wire 5 is wrapped with the insulating paper 16 together with the capacitor element 11, it is not necessary to secure a space for insulating them from the tank 1 when they are exposed. .

Further, since the capacitor element 11 in the unit capacitor 3 is only wrapped with the insulating paper 16 and the unit capacitor 3 is housed in the open case 4 having an opening, the closed case of the conventional example. It is also unnecessary to secure a space in the tank 1 for dealing with the bulge that has occurred.

As described above, according to the above-described embodiment, the space in the tank 1 required in the conventional example is not required as described above, and as a result, the space in the tank 1 can be made compact, which results in downsizing. Therefore, it is possible to realize a capacitor that is lighter in weight and lower in cost.

In the above embodiment, the case where 24 unit capacitors are used has been described, but the present invention is not limited to this. Further, although the above-mentioned embodiment relates to a capacitor for three-phase AC power, the present invention is not limited to this, and may be for single-phase AC power and other uses.

[0017]

As described above, in the capacitor of the present invention, since the lead wire connected to the electrode lead-out portion of the capacitor element is directly connected to another unit capacitor or bushing, the unit capacitor of the conventional example is used. It is not necessary to secure a space in the tank for the bushing and a space for insulating the charging part from the tank. Further, in the unit capacitor, since the electrode lead-out portion of the capacitor element and the connecting portion between the electrode lead-out portion and the lead wire are covered with the insulating paper, it is not necessary to secure a space for insulating them from the tank. Further, the capacitor element in the unit capacitor is not covered with the sealed case as in the conventional example, but is only wrapped with the insulating paper, and the unit capacitor is housed in the open case having the opening. Therefore, it is not necessary to secure a space in the tank for dealing with the bulge that occurs in the case of the conventional sealed case due to heat generation of the capacitor element. As a result, it is possible to realize a capacitor that is compact, lightweight, and cost-effective.

[Brief description of drawings]

FIG. 1 is a front cutaway view of a capacitor according to an embodiment of the present invention.

FIG. 2 is a side cutaway view of the same embodiment.

FIG. 3 is a view showing a state before wrapping the unit capacitor in the embodiment with insulating paper.

FIG. 4 is a sectional view of an open case accommodating a unit capacitor in the same embodiment.

FIG. 5 is a diagram showing a structure of a conventional capacitor.

[Explanation of symbols]

 1 Tank 2 Bushing 3 Unit Capacitor 4 Open Case 5 Lead Wire 11 Capacitor Element 15 Electrode Lead Out 16 Insulating Paper

Claims (1)

[Claims] 1. A capacitor constituted by accommodating a plurality of unit capacitors (3) in a tank (1),
A unit capacitor (3) is constructed by enclosing one or more capacitor elements (11) together with the lead wire (5) connected to the electrode lead-out part (15) of the capacitor element (11) with insulating paper (16). After accommodating the unit capacitor (3) in an open case (4) having an opening,
A plurality of open cases (4) are housed in the tank (1), and the lead wires (5) that need to be drawn out of the unit capacitor (3) are connected to the insulating paper (16).
The capacitor which is drawn out through the gap of the package and is connected to the lead wire (5) of another unit capacitor (3) or the bushing (2) provided on the outer wall of the upper surface of the tank (1).