JPH0229705Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lid for a high-voltage capacitor including a special high-voltage capacitor.

A conventional high-voltage capacitor will be explained based on FIGS. 1 and 2. A lid 2 is hermetically attached to an iron case 1, and a high-voltage capacitor paper or synthetic resin film and aluminum foil electrodes are placed inside the case 1. A plurality of alternately wound capacitor elements 3 are arranged in a row, and are arranged inside the case 1 and the capacitor elements 3.
An insulating paper 4 is provided between the two. Each capacitor element 3
The connection lead 5, which is Δ-connected or Y-connected, is connected to an external connection terminal 7 through a drawer bushing 6 made of high-voltage porcelain that is attached to the lid 2 in a sealed manner. Note that the insulation of the capacitor element 3 is enhanced by filling the case 1 with insulating oil 8.

In conventional high-voltage capacitors, it is necessary not only to ensure the necessary electrical insulation between each capacitor element 3, but also to ensure the necessary electrical insulation between each capacitor element 3 and case 1.
Electrical insulation must also be ensured between the wiring lead 5 and the lid 2, and necessary electrical insulation must also be secured between the connection lead 5 and the lid 2. The electrical insulation between the capacitor element 3 and the case 1 or the lid 2 inside the case 1, and the electrical insulation between the connection lead 5 and the case 1 or the lid 2 are achieved by the solid surface portion intervening between them. Since this becomes a weak point in the insulation, it is necessary to increase the creepage distance of the solid material around it that becomes the weak point in the insulation. Therefore, as the rated insulation class becomes higher, the dimensions of the case 1 are increased in order to increase the creepage distance, but there is a problem that the case 1 becomes large.

This idea was made in view of the above circumstances, and its purpose is to provide a lid for a high-voltage capacitor that can increase the creepage distance without increasing the size.

This invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIGS. 3 to 5, a lid 12 is attached to a bolt 1 through a sealing material 11 such as an O-ring to an open container 10 of a high-voltage capacitor formed in a box shape or the like.
It is fixed in a sealed manner by 3 etc. The open container 10 has a chamber 1 for storing the capacitor element 3.
4 are partitioned by a partition plate 15. This partition plate 15 is desirably formed integrally with the open container 10 using an insulator such as synthetic resin, but it may also be formed separately and then attached to the open container 10. As described above, the capacitor element 3 is made by alternately winding insulating paper or synthetic resin film and aluminum foil electrodes. Further, when a plurality of capacitor elements 3 are inserted into the room 14, it is desirable to provide a spacer 16 between the capacitor elements 3.

A circumferential partition wall 17 extending downward along the inner circumferential wall of the open container 10 is integrally formed on the lower surface of the lid 12 . This partition wall 17 extends downward along the inner circumferential wall of the open container 10 to surround the entire capacitor element 3, and each phase unit for a three-phase system in which the capacitor elements 3 are connected by a Δ connection, a Y connection, etc. It may also be positioned between the capacitor element groups and formed integrally. In addition, the above lid 1
2 is provided with a high-voltage retractable bushing 19 with an external terminal 18 protruding from the center.
is connected to the capacitor element 3 by the connection lead 20.
They are connected by wire connection or Y connection. Note that the lid 12 connects the external terminal 18 to the high voltage lead-in bushing 1.
Although it is preferable that the bushing 19 is formed separately from the lid 12 and is made of ceramic or the like and is fixed to the lid 12, Good too.

A gas filling inlet 2 is provided at an arbitrary position of the open container 10.
1 is formed, and a capacitor element 3 is placed in the open container 10.
After attaching the lid 12 and fixing the lid 12, the inside of the open container 10 is vacuum degassed, and then the insulating gas 22 is pumped at 0 to 1.5 kg/
Enclose in cm ² . When a gas filling nozzle is inserted into the gas filling inlet 21, the gas can be discharged into the open container 10 or sucked in from the inside by the nozzle, and after the insulating gas 22 is filled, it becomes a sealed state or a sealed state. Or, it can be sealed.

Note that the lid 12 and the open container 10 are attached with bolts 13.
If the open container 10 does not have sufficient strength in the case of fixing by screwing, as shown in FIG. Just leave it as . Further, the lid 12 and the open container 10 may be fixed in a sealed manner using an adhesive or the like. Furthermore, it goes without saying that the thickness and strength of the lid 12 and the open container 10 are designed in consideration of ground insulation and the like.

The above embodiment has been explained based on an oil-less high-pressure capacitor in which an insulating gas 22 is sealed between the open container 10 and the lid 12, and has been shown to be lightweight. It may be.

As mentioned above, this idea is based on the provision of a partition wall that goes around the entire capacitor element on the underside of the lid, which increases the creepage distance from the capacitor element to the open container or lid, so that it is not required for the rated insulation class of high-voltage capacitors, unlike conventional high-voltage capacitors. Therefore, there is no need to increase the distance between the capacitor element and the case 1 or the lid 2, and therefore, it can be used even with high-grade rated insulating substrates without changing the size of the container. This has the advantage of being a non-corrosive capacitor.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal and cross sectional views showing a conventional example, Figures 3 and 4 are a vertical and cross sectional view showing an example of this invention, and Figure 5 is a view of the 3rd embodiment. FIG. 10...Open container, 11...Sealing material, 12...
... Lid, 19 ... High pressure lead-in bushing, 17 ... Bulkhead.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a high-voltage capacitor consisting of a lid and an open container for storing a capacitor element, a partition wall that surrounds the entire capacitor element in the open container is integrally provided on the lower surface of the lid. Lid for high voltage capacitor. (2) The lid for a high-voltage capacitor according to claim 1, wherein the partition wall has a circumferential shape along the inner circumferential wall of the open container. (3) The lid for a high-voltage capacitor according to claim 1 or 2, wherein the lid and the open container are fixed in a sealed manner, and an insulating gas is sealed therein.