JPH0422013B2 - - Google Patents

Abstract

1. Cylindrical oil vessel, for tap switches of tapped transformers, which consists of an insulating cylinder (1) carrying the outer terminal and output contacts (7, 13) and of a cover and base part (2) flanged on thereat, wherein the base part (2) engages by a rim into the clear width of the insulating cylinder (1) and an O-ring seal (5), which is arranged at this rim in an encircling recess (4), lies sealingly against the inside of the insulating cylinder (1) and wherein at least one output ring (6) is present, which extends around at the inside wall fo the insulating cylinder (1) and is connected with the outer output contacts (7), characterized thereby, that the base part (2) is constructed as glass-fiber re-inforced moulded part of insulating material, which part lies against the end face of the insulating cylinder by means of several shaped-on eyelets (9) protruding relative to the outer circumference of the insulating cylinder (1) and is firmly connected with the insulating cylinder by means of several tie bolts (8), which are on the one hand plugged through the eyelets and on the other hand anchored at the output contacts (7) sitting in the wall of the insulating cylinder, wherein the rim (3) engaging into the insulating cylinder reaches almost as far as the output ring (6) and the upwardly free recess (4) for the O-ring seal (5) is covered by means of the output ring.

Description

Detailed Description of the Invention [Industrial Application Field] This invention consists of an insulating cylinder carrying an external connection contact and a pull-out contact, a lid part and a bottom part which are flange-connected to this cylinder, and the bottom part is It is formed as a glass fiber-reinforced molded body made of an insulating material, and its edge is fitted inside an insulating cylinder, and the O-ring packing arranged in the circumferential notch of this edge is brought into airtight contact with the inside of the insulating cylinder. The present invention relates to a cylindrical oil container for an on-load tap changer of a transformer, with at least one draw-out ring connected to an external draw-out contact around the inner wall of the transformer.

[Conventional technology]

This type of oil container usually has a metal bottom fixed to the flange by means of a number of bolts or rivets that pass through the cylindrical wall of the oil container and are fixed to the flange (German utility model registration). No.
7114665 specification). The above-mentioned method of fixing the metal bottom is expensive. Another difficulty is that when the on-load tap changer is in operation, an undefined potential is applied to the metal bottom of the oil container, which tends to generate parasitic potential, and the bottom should be connected as much as possible via electrical lines. This is because it is connected to the output potential of the on-load tap changer.

[Problem of invention]

The object of the invention is to improve the connection between the bottom and the cylinder and the generation of parasitic potentials in the case of the oil container of the on-load tap changer.

[Means to solve problems]

The above problem has been solved by the present invention, in the case of an oil container of the type mentioned at the beginning, the bottom part is in contact with the end surface of the insulating cylinder by a number of protrusions formed to protrude from the outer periphery of the insulating cylinder, and the bottom part is in contact with the end face of the insulating cylinder, and penetrates through the above-mentioned protrusions. Moreover, it is fixedly connected to the insulating cylinder by a large number of tension bolts fixed to the drawer contacts on the wall of the insulating cylinder, and the edge that fits into the insulating cylinder almost reaches the drawer ring, and the O-ring packing is upwardly connected. This problem is solved in that the cutout is covered by a pull-out ring.

Further advantageous developments according to the invention are specified in claim 2.

〔Effect of the invention〕

The advantages obtained with this invention are as follows. That is, in order to fix the bottom part to the insulating cylinder, not only is it not necessary to make an extra hole in this cylinder, but in any case a pull-out contact which is embedded in the necessary cylinder wall can be used for fixing the bottom part. The notch of the O-ring packing may face upward. This is because the notch is covered with a pull-out ring inside the oil container, so the inserted O
This is because the ring will not slip out of the notch. Therefore, it is not necessary to provide a hollow at the bottom, and the molded part made of insulating material can be manufactured at low cost. An extraction potential is applied to the connecting member between the bottom and the extraction contact from the beginning. There is also no need for special metal connecting conductors to connect the metallic bottoms, since there is no longer an undefined potential associated with the bottoms.

It is effective if four protrusions are provided on the bottom, evenly distributed around the circumference, and these protrusions correspond in number and arrangement to, for example, the arrangement of four draw-out contacts in an insulating cylinder. . These protrusions can be formed on the bottom with each leg projecting downwardly. In that case, each leg transitions into a respective rib that tapers towards the center of the cylinder to strengthen the bottom.

〔Example〕

Embodiments of the invention are shown in the accompanying drawings, and the invention will be explained in more detail below.

As can be seen from the accompanying figures, the oil container is substantially formed by an insulating cylinder 1 and a bottom part 2 flanged to this cylinder. The lid part, which also has a flange connection for closing the oil container upwards, is omitted in the drawing. The bottom part 2 consists of a molded body of insulating material reinforced with glass fibers and fits into the inside of the insulating cylinder 1 by means of an edge 3. In the notch 4 which goes around the edge 3, the notch 4 for the O-ring packing 5 is covered, in the case of the bottom part 2 inserted into the insulating cylinder 1, by a pull-out ring 6 which is substantially provided on the inner wall of the insulating cylinder 1. It is being said. Therefore, the O-ring packing 5 will not slip off from the notch 4. The pull-out ring 6 is held by a number of connecting bolts 7 on the inner wall of the insulating cylinder 1. These connecting bolts 7 are simultaneously used as draw-out contacts for the connection terminals of the outer draw-out part of the tap changer. Furthermore, a special tension bolt 8 is connected to the connecting bolt 7. This tension bolt is inserted through a respective projection 9 of the bottom part 2 and is used to fix the bottom part to the insulating cylinder 1. In this case, bottom 2
is in contact with a protrusion 9 protruding from the end face of the insulating cylinder. Furthermore, a leg 10 is formed on the bottom with each protrusion 9 being molded. This leg portion 10 transitions toward the center into a rib 11 reinforcing the bottom portion. The legs 10 are used to securely mount an oil container or a fully assembled on-load tap changer. Furthermore, inside the bottom part 2 there is a bearing 12 which receives a switching rotation shaft of a tap changer, which is not shown in detail. This switching axis is used to operate a movable contact system that cooperates with fixed contacts 13 in the wall of the insulating cylinder 1.

[Brief explanation of drawings]

The accompanying drawing is a partial cross-sectional view of an embodiment of the invention. Reference numbers in the figure: 1...Insulating cylinder, 2...Bottom, 3...
Edge, 4... Notch, 5... O-ring packing, 6...
Pull-out ring, 7... Connection bolt, 8... Tension bolt,
9... Protrusion, 10... Leg, 11... Rib, 12... Bearing, 13... Fixed contact.

Claims (1)

[Scope of Claims] 1. Consisting of an insulating cylinder carrying an external connection contact and a pull-out contact, a lid part and a bottom part that are flange-connected to this cylinder, and the bottom part is formed as a glass fiber reinforced molded body made of an insulating material. The edge is fitted inside the insulating cylinder, the O-ring packing arranged in the circumferential notch of this edge is brought into airtight contact with the inside of the insulating cylinder, and connected to the external lead-out contact around the inner wall of the insulating cylinder. A cylindrical oil container for an on-load tap changer of a transformer having at least one pull-out ring, the bottom part 2 of which is connected to the end face of the insulating cylinder 1 by a number of protrusions 9 protruding from the outer periphery of the insulating cylinder 1. A number of tension bolts 8 abutting and passing through the projections and fixed to the pull-out contacts 7 on the wall of the insulating cylinder.
The O-ring packing 5 is fixedly connected to the insulating cylinder, the edge 3 fitted into the insulating cylinder almost reaches the pull-out ring 6, and the upward notch 4 of the O-ring packing 5 is covered by the pull-out ring. oil container. 2. Four protrusions 9 are provided evenly distributed around the circumference, and together with these protrusions they form one leg 10 that protrudes downward, and the legs taper toward the center of the cylinder to reinforce the bottom. The oil container according to claim 1, characterized in that the oil container transitions to a rib (11).