JPH0422326B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention has a housing wall formed of a hollow winding frame made of resin-impregnated fibers, which are wound crosswise and overlappingly at a certain winding angle, and which connects a plurality of contacts with different potentials. The present invention relates to a cylindrical oil container for an on-load tap changer of a transformer, carried in one plane and in at least one other plane of the cylinder, the contact being inserted into a hole or notch in the wall of the housing.

BACKGROUND OF THE INVENTION It is known to form the cylinder of this type of oil container from a hollow spool of resin-impregnated fibers. In this case, in order to obtain high mechanical strength, the fibers are wound crosswise in the axial and radial directions. Certain winding forms and winding programs with different winding angles are used to match the mechanical stresses expected in the hollow bobbin, not just the oil container described above. However, in the above-mentioned oil container, there is a problem not only with the mechanical stress of the hollow spool, but also with the special insulation load in addition to the mechanical stress. Here, the voltage load occurring between the contacts plays a special role.

[Problem of invention]

The object of the invention is to improve an oil container of the type mentioned at the outset, which, in addition to high mechanical strength, also provides in particular dielectric strength between contacts of different potentials.

[Means to solve problems]

The above-mentioned problem is solved by the invention, in the case of oil containers belonging to the type mentioned at the outset, in which the fibers passing through the hole (for example 2) or notch of a contact at one potential are connected to each hole (for example 2) of the contact next to another potential. For example, the problem is solved by setting the winding angle β of the fiber so that the fiber passes through without hitting the notch.

[Effect]

The invention is based on the fact that an insulating cylinder made of cross-wound resin-impregnated fibers cannot be uniformly regarded as an insulating material. With such materials, it is necessary to maintain insulation strength depending on the direction of the load voltage. In that case, it is desirable to consider two voltage loading directions: the fiber orientation and the voltage loading perpendicular to this direction. Here, the voltage load in the direction of the fiber is always more favorable than the voltage load in the orthogonal direction. The reason for this is that the resin does not reliably impregnate individual fibers in places, and a dielectric breakdown path occurs along the fiber between two points at different potentials.

〔Effect of the invention〕

If, as proposed here, the winding angle is set so that the fibers exiting a certain hole in the cylinder wall pass through without hitting any neighboring holes, no breakdown path will occur directly. Other advantages obtained with this invention are:
The main point is that the insulation strength of the cylinder wall, which occurs between contacts of different potentials of the cylinder, is improved overall.

[Example] An example of the present invention is partially shown in the drawings, and the present invention will be explained in more detail.

With reference to the accompanying drawings, the cylindrical wall 1 has two holes 2, 3 in a first cylindrical surface E1 and two further holes 4, 4 in a second cylindrical surface E2 for housing contacts, not shown in detail. There are 5. Cylindrical surface E of wrapped fiber
The slope with respect to 0 is shown as the winding angle β. Therefore, for the wrapping angle β, the condition α ₁ <β<α ₂ or β>
α ₃ occurs. Here, the angles α ₁ , α ₂ , α ₃ are formed by tangents t ₁ , t ₂ , t ₃ to different sides of the different holes 2 and 3 and 2 and 5, respectively.

t ₁ is a tangent line formed by different sides of the two holes 2 and 3 on the same plane E ₁ .

t ₂ is a tangent line formed by the opposing sides of the two holes 2 and 5 on the plane E ₁ and the plane E ₂ .

t ₃ is a tangent line formed by the sides of the two holes 2 and 5 facing away from each other on the plane E ₁ and the plane E ₂ .

[Brief explanation of drawings]

The attached figure is a schematic diagram showing a part of the cylindrical wall of the oil container developed. Reference numbers in the figure: 1... Cylindrical wall, 2, 3, 4, 5
...hole, β...winding angle.

Claims (1)

[Claims] 1. The wall of the housing is formed by a hollow spool made of resin-impregnated fibers wound crosswise at a certain winding angle, and carries a plurality of contacts of different potentials in one plane of the cylinder and in at least one other plane. , in a cylindrical oil container for an on-load tap changer of a transformer, in which the contact is inserted into a hole or notch in the wall of the housing, the fibers passing through the hole (e.g. 2) or notch of the contact at one potential are connected to another An oil container characterized in that the winding angle β of the fiber is set so that the fiber passes through each hole (for example, 3, 5) or notch of the contact next to the potential of the fiber.