JPH0314033Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to means for preventing deformation of high-voltage coils in gas-insulated voltage transformers.

In gas-insulated instrument transformers that are used by being housed in a container filled with insulating gas, the high-voltage coil (primary coil) uses plastic film for interlayer and other insulation, and the coil is wound in a single layer on a winding frame. A multilayer wire ring is used, each of which is insulated by wrapping a plastic film around it.

On the other hand, in this type of high voltage equipment, in order to alleviate the electric field, a shield is provided on the low voltage side to surround the high potential part.

In multilayer wire rings that use plastic film for insulation, the windings tend to slip and deform between the layers. Therefore, when an axial load is applied to the windings, it easily deforms and the high voltage part is connected to the low voltage shield or other earth ground. If it comes close to potential parts, there is a risk of insulation deterioration and possibly flash flash.

Figure 1 shows a conventional structure for preventing deformation in a gas-insulated instrument transformer in which high-voltage coils are insulated with plastic, and is a sectional view of an embodiment to which the present invention is applied to eliminate the drawbacks. be.

A fixing cylindrical body 3 is attached to a high voltage shield 2 fixed on the outer periphery of the high voltage (primary) wire ring 1, and a support rod 5 is fixed to the high voltage conductor 4a of the insulating spacer 4. 5 is inserted into the cylindrical body 3 and fixed. In this case, the winding end of the high voltage coil 1 is connected to the high voltage shield 2, so the high voltage conductor 4a
is connected to the winding end of the high-voltage coil 1, that is, to the high-voltage side, and the cylindrical body 3 acts to mechanically prevent the high-voltage coil 1 from deforming or moving. Note that 8 is a low voltage wire, 9 is a low voltage shield, and 10 is a high voltage conductor 4a.
11 is an iron core, 12 is a container, and 13 is an insulating gas filled inside thereof.

However, during assembly, the cylindrical body 3 and the support rod 5 are tightly engaged, so the work cannot be carried out smoothly, and the high-voltage wire ring 1 may be deformed, or fine damage may occur due to the sliding between the two metals. There is a risk that metal powder may be generated, and in particular, if metal powder comes out, there is a risk that it will stagnate in the container and impair insulation performance. In addition, measures such as applying conductive grease to the sliding surfaces of the cylindrical body and support rod for lubrication have been taken, but this is not desirable as it risks adhering to other parts and damaging the insulation. Nakatsuta.

The present invention has been made to eliminate this drawback, and as shown in the figure, for example, a collar 6 made of synthetic resin is attached to the support rod 5, and the cylindrical body 3 is brought into contact with the support rod 5 through the collar 6. Do it like this. however,
Since the collar 6 is an insulator, the high voltage conductor 4a and the cylindrical body 3 are connected by the connecting wire 7. In this way, the support rod 5 comes into contact with the cylindrical body 3 via the collar 6, and directly contacts the cylindrical body 3 as in the conventional case.
There is no risk of so-called galling, etc., and they are smoothly engaged, and the two are electrically connected reliably by the connecting wire 7.

Note that the collar 6 does not necessarily need to be attached and fixed to the support rod, but is simply interposed between the two.
Alternatively, it can be wound around a support rod in the form of a thin film, and when inserted into a cylindrical body, it can be interposed between the two and smoothly engaged. In short, the support rod and the inner surface of the cylindrical body should be interposed to prevent a direct metal connection between them, and the support rod and the cylindrical body should slide through an intermediate synthetic resin layer. It is necessary that mechanical contact be maintained and that they be fixed to each other.

Next, Fig. 2a is a sectional view of another embodiment, and Fig. 2b is a sectional view of another embodiment.
2 shows an enlarged cross-sectional view of the main part thereof, and in this case, on the contrary, the support rod 5 is attached to the outer periphery of the high-voltage coil 1, and the cylindrical body is fixed to the high-voltage conductor 4a of the insulating spacer. In this embodiment, the connecting wire 7 is coiled and provided inside the cylindrical body 3.

For the collar 6 used in the present invention, or as an alternative lubricant layer interposed between the cylindrical body 3 and the support rod 5, a synthetic resin that can slide in contact with metal with little friction is suitable. In particular, tetrafluoroethylene (trade name: Teflon) is preferable.

As mentioned above, this is worn as a collar,
Or, by making it into a film shape and interposing it as a lubricating layer between the two by means of baking it on at least one of the support rod and the cylindrical body,
The support rod is assembled by sliding on the cylindrical body without friction, and thereafter acts as a mechanically strong fixing means.

As explained above, the support rod and the cylindrical body, which were conventionally used as a means for connecting to a high-voltage wire and as a means for preventing deformation, are used in the present invention only as a fixing means for preventing deformation, and a lubricating layer made of synthetic resin is layered between them. This eliminates the drawbacks caused by sliding between metals, and as a connection means, a separate connecting wire is provided to maintain a perfect connection. This is effective as a structure for preventing deformation of wire wheels.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a conventional high-voltage coil fixing means, and FIGS. 2a and 2b are a sectional view and an enlarged sectional view of a main part showing another embodiment. DESCRIPTION OF SYMBOLS 1... High-voltage wire ring, 3... Cylindrical body, 4a... High-voltage conductor, 5... Support rod, 6... Collar, 7... Connection wire.

Claims (1)

[Scope of utility model registration request] At an engaging part that connects the winding end of the outer periphery of the high-voltage wire ring and a high-voltage conductor for drawing out the high-voltage side from the high-voltage wire ring and fixes the outer periphery of the high-voltage wire ring to the high-voltage conductor, A lubricating layer made of synthetic resin is provided between the fixed first conductor and the second conductor fixed to the high voltage conductor, and the first and second conductors are in contact with each other via the lubricating layer. A gas-insulated instrument transformer characterized in that the high-voltage wire hoop terminal end and the high-voltage conductor are connected to each other by a connecting wire, while being slidable or fixed.