JPH0361323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a barrier device for an oil-immersed lead installed in ultra-high voltage oil-immersed insulated equipment such as a 1 million V power transmission transformer, and particularly to a support device for the barrier.

For example, in a 1 million V class ultra-high voltage transformer,
Generally, the capacity per phase is considered to be 1000MVA, but it is thought to be difficult to manufacture a single-phase converter with the above-mentioned large capacity that satisfies the current transportation restriction conditions, so as an alternative, , 1/2 phase
It is considered that a capacity of 1000 MVA per transformer can be produced by dividing the transformer into two transformers with a capacity of 500 MVA and connecting them as shown in Figure 1 of the attached drawings.

That is, FIG. 1 shows two such transformers 1
This diagram schematically shows the connection between a and 1b,
High-voltage submerged oil leads 3, ie, 3a, 3b, coming out of the coils 2a, 2b of each transformer 1a, 1b are connected via a connecting portion 4 between both transformers 1a, 1b. In addition, in FIG. 1, the two oil submerged leads 3 are connected to the lower shield 6 of the pushing 5.
Although a and 3b are drawn as being connected,
In practice, there are various ways of connecting this. However, since this connection method is not particularly relevant to the present invention, its explanation will be omitted here.

The connecting portion 4 between the transformers 1a and 1b configured in this manner is preferably made as small as possible from the viewpoint of manufacturing difficulty and cost. but,
For example, in the case of an ultra-high voltage transformer, since an ultra-high voltage is applied to the submerged lead 3, the diameter of the lead itself must be considerably large.
In order to reduce the size of this connecting portion 4, it becomes necessary to improve the dielectric strength by arranging a barrier device as shown by reference numeral 7 around the submerged lead.

The present invention relates to a barrier device for oil-immersed leads of ultra-high voltage oil-immersed insulation equipment that requires the installation of such a barrier device, and particularly to a support device for this barrier.

Now, the cross section of the submerged oil lead on which the barrier device is provided is as shown in FIG.
b, a lead conductor surface, 9 a taping, for example, paper tape, wrapped as necessary on the lead conductor surface 8; 7, for example, 7a, 7b, 7c a barrier surrounding the outer periphery of the oil-immersed leads 3a, 3b; For example, a barrier is provided in three layers, and as shown in the figure, submerged leads 3a, 3b, taping 9, and barrier 7, that is, each barrier 7a, 7b, and 7c, are often arranged in concentric circles. , from the viewpoint of optimizing dielectric strength, it is necessary to have a concentric arrangement.

In this way, a barrier 7, for example, a three-layer barrier 7, is placed concentrically with the lead conductor surface 8 of the submerged lead 3.
a, 7b, 7c, the lead conductor surface 8 or taping 9 and the innermost barrier 7a
or between the barriers, for example, between the barriers 7a and 7b, and between the barriers 7b and 7c, spacers must be provided so that the positions of the respective barriers 7a, 7b, and 7c can be fixed.

As shown in FIG. 3, the spacer 10 has conventionally been a rod-shaped body having the same dimensions as the distance between the inner barrier and the outer barrier, for example, the thickness, and approximately the same length as the barrier 7. This is the inner layer surface 11,
For example, it is placed on the lead conductor surface 8, the taping 9, or the surface of the barrier 7 installed on the inside, parallel to the axial direction of the submerged lead 3, and the outer layer of the barrier 7 is placed on top of it as shown by the arrow X. It was wrapped.

However, such a configuration has the following drawbacks. In other words, (1) In order to obtain the correct distance between the barriers or between the barrier and the lead in the oil, it is necessary to provide a large number of spacers, probably at least 6, and the length of the spacers is also long. Therefore, a large total amount of spacers is required. Therefore, the weight of the spacer increases, increasing the overall weight.

(2) The barrier is wound in the direction of the arrow X in the upper left of Figure 3A. Therefore, at that time, the barrier is wrapped while being pulled, so theoretically the concentric arrangement of the barrier should not be disrupted. In reality, it is not easy to maintain this concentric arrangement, and deformation often occurs.

The present invention eliminates the drawbacks of conventional barrier devices, and provides a barrier device for lead in oil that allows the barrier to be installed correctly, reduces the required amount, and is lightweight. Its purpose is to

In order to achieve this object, the present invention includes annular spacers that are fitted so as to be in contact with the surface of an oil-submerged lead or an inner barrier and are arranged at predetermined intervals; The spacer is composed of a wound barrier;
It is divided into two or more pieces on the radius line,
In addition, each divided surface is characterized in that an inset portion is formed so that connection can be made by fitting.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing one embodiment thereof.

FIG. 4 is an example of a submerged lead having a barrier device consisting of three layers of barriers. In the figure, reference numeral 3 denotes an oil-submerged lead, 9 a taping wound around the surface of the oil-submerged lead 3, and numeral 20 a barrier of each layer wound in the circumferential direction.
is the middle side, 20c is the outer barrier, and 21
is a spacer of each layer formed in an annular shape, and 2
1a, 21b, 21c are taping 9,
These are spacers between the inner barrier 20a, the middle barrier 20b, and the outer barrier 20c. In this embodiment, the spacers 21 inserted between each layer are arranged on the same radius, which has the advantage that even if the material of the barrier is weak, the cross-sectional shape of the barrier structure is not impaired. . If the material of the barrier is strong, or if it has a reinforced structure, which is an applied usage described later, the code 22 is used.
As shown by a and 22b, the positions of the spacers can be sequentially shifted as necessary.

The details of the barrier 20 and the spacer 21 in the present invention are shown in FIG. They are in contact with each other and are formed in an annular shape having a predetermined thickness and a predetermined width, and a barrier 20 is wound around the outer periphery in the direction indicated by the arrow x shown in FIG.

However, in such a configuration, a space 23 where oil accumulates as shown in the figure is created between the adjacent spacer 21 and the surface of the taping 9 or the inner layer surface 11 of the barrier 20 and the outer barrier 20. On the other hand, the oil-submerged lead 3 generates heat due to the flow of current, which is highly likely to cause insulation deterioration. It is necessary to cool the middle lead 3. Therefore, in order to circulate the cooling oil in the space 23, as shown in FIG.
4 is provided with an oil flow hole 25 passing through it in the axial direction to allow cooling oil to circulate. In addition, in FIG. 6, an oil flow hole 25 is provided on the inner diameter side of the spacer 24.
However, of course, there is no need to be limited to this. For example, an oil flow hole 2 is provided on the outer diameter side of the spacer 24, such as the oil flow hole 26 indicated by a dashed line.
6 may be provided, or a regular circular oil flow hole may be provided, and further, a combination of these, or alternatively, the oil flow hole 24 may be provided in the center of the spacer 24 depending on the situation. An appropriate shape may be selected and provided accordingly.

In addition, when providing a barrier device using such an annular spacer, first fabricate the inner barrier or oil-immersed lead, place the spacer on the inner barrier or oil-immersed lead, and then attach the spacer to the oil-immersed lead. The outer barrier is wrapped around the outer periphery of the outer barrier. In this case, there are various methods for arranging the spacer on the inner barrier or the submerged lead, but the main ones are as follows. That is, the first method: Fit an annular spacer from the outside of the inner barrier and slide it into a predetermined position.

Second method: Divide the annular spacer into two or more pieces along its radius and attach them to the inner barrier.

Third method: The annular spacer is divided into two or more parts on its radius line, and the divided parts are fitted into each other, and formed so that both divided parts are fixed to each other when fitted. Then, this divided portion is placed on the inner barrier and slid into place, and after being fitted, both divided portions are fixed to each other to integrate the spacer as a whole.

The spacer may be installed by any of the above three methods, but in this invention, the above third method is used.
It depends on the method. Two specific examples will be described using a case in which a spacer is divided into two.

First example: Fig. 7 shows a spacer 30 divided into two parts to form divided parts 30a and 30b, and a fitting part, that is, a fitting hole 31 or a fitting protrusion 32, is provided on each dividing surface of each divided part 30a, 30b. This is an example of something.

The method of assembling this spacer 30 is as shown in FIG.
Place the divided parts 30a and 30b of the spacer 30 divided in half on top or on the taping 9 thereof, shifting them from each other as shown in the figure, and aligning the fitting holes 31 and fitting protrusions 32 with each other. The divided parts 30a, 30b are slid in the direction of the arrow Y in the figure, and the fitting protrusion 32 is fitted into the fitting hole 31, so that both the divided parts 30a, 30b are formed into an annular spacer 30.

2nd example: FIG. 9 shows a further improvement of the fitting shown in FIG.
However, the fitting portions, that is, the fitting hole 41 and the fitting protrusion 42 are moved closer to the center of the spacer, and their width is adjusted to the dividing portion 4.
It is made narrower than the thickness of holes 0a and 40b, and lands 43 are left on both sides of the fitting hole 41. Therefore, in order to fit the divided parts 40a, 40b, each divided part 40a, 40b must be
Similarly to the first example, for example, by sliding on the taping 9, the fitting holes 41 and the fitting protrusions 42
However, when they are fitted together, the size of the fitting protrusion 42 and the lands 43 on both sides of the fitting hole 41 do not match, and therefore, these two parts touch each other. However, the current inner barrier 20 made of oil submerged reed 3 with taping 9, press board, etc. is usually elastic and can be slightly flexible by suppressing it, so the divided portion 40a , 40b toward each other, the fitting projection 42 slides over the land 43 and into the fitting hole 41, and the fitting hole 41 and the fitting projection 42 are fitted together. In this way, when the fitting hole 41 and the fitting protrusion 42 are fitted together, in this state, the divided portion 40 is divided into two by the taping of the submerged lead or the elasticity of the inner barrier.
There is also an advantage that a and 40b are difficult to separate from each other and are firmly fixed. In addition, these 2
In order to make it easier to fit the fitting parts of the divided parts 40a and 40b, the fitting side corners of the fitting protrusions 42 are rounded and the chamfered part 44 is formed.
may be formed.

Furthermore, these methods have the advantage that they can more easily tighten the inner barrier, etc., and can be applied not only to the structure of the spacer but also to the method of fixing the outer barrier. Note that what is shown in the second example is considered to be more appropriate than what is shown in the first example. Above, we have described two examples of how to fit each divided part of the barrier.
Of course, the method is not limited to this, and various methods can be devised.

Further, as an effective application example of the spacer according to the present invention, a reinforcing device as shown in FIG. 10 may be provided. This will be explained below.

Simply wrapping the barrier around the spacer according to the present invention is not suitable for cases where the material of the barrier is weak and the outer barrier easily deforms, or when the distance between spacers is long and the barrier structure needs to be made a little stronger. As shown in FIG. 10, it is also possible to have a structure in which reinforcing members 51 are arranged between the spacers 50 at appropriate intervals, for example, four reinforcing members 51 are arranged around the entire circumference so as to support the barrier wound on the outside. . In the case of such a structure, the spacer 5
Since the outer barrier is wrapped over the reinforcing member 51 and the reinforcing member 51, it is possible to prevent the outer barrier from deforming from the predetermined shape. In addition, in such a configuration, since the reinforcing material 51 is not required to function as a spacer, it is required to function as a spacer more than a spacer provided in the axial direction of a conventional submerged oil lead. It also has the advantage that fewer reinforcing materials are required. Furthermore,
The reinforcing members 51 may be provided on the same line like the reinforcing members 51', or may be provided staggered like the reinforcing members 51'', or they may be used in combination.

In addition, this reinforcing method is shown as one provided on the outer edge side of the spacer to strengthen the attachment of the outer barrier, but in order to maintain the mutual position between the spacers and control the inner barrier position, There is no problem with attaching it to any other part.

Since the barrier device of the present invention is constructed as described above, when a barrier material having a relatively strong strength such as the conventionally used pressboard is used, deformation of the submerged lead in the axial direction is small. Become,
Therefore, the number of spacers to be arranged between the submerged lead and the barrier or between the barriers does not need to be very large, and as a result, the total amount of spacers required is reduced, and the total weight of the spacers is also reduced. In addition, since the spacer has an annular shape, there is almost no deformation of the cross-sectional shape of the barrier, and therefore, the spacing between the submerged lead and the barrier and between the barriers can be maintained correctly. have.

In addition, when setting the barrier of the present invention, the above-mentioned methods are used, but any of these methods has one advantage in manufacturing compared to the conventional barrier structure using spacers installed in the axial direction. It can be seen that this occurs. In other words, according to the conventional barrier structure, after wrapping the inner barrier,
It is necessary to tape the inner barrier tightly to prevent it from unraveling, and only then can the process of placing the next spacer on the outside and wrapping the outer barrier around the spacer be repeated.
However, in the barrier structure of the present invention, the inner barrier is automatically fixed by the fitted spacer, so there is no need to tightly tie the barrier.
It also has the effect that only temporary holding is required and work efficiency is greatly improved. In particular, when using the third method of spacer installation, work efficiency when assembling the barrier is further improved. It has the effect of

The structure and effects of the present invention have been explained above by taking as an example an oil-immersed lead of a transformer connection part and a case where a barrier with a concentric structure is provided on the oil-immersion lead. It is not limited,
In addition, the cross-sectional shape of the barrier is not limited to concentric circles.
It can be applied to the oil-submerged shield part of oil-immersed insulated equipment, and the cross-sectional shape of the barrier can be shaped as required, so it also has the advantage of providing a barrier with a free cross-sectional shape. .

In addition, in the oil lead of a 1 million V class transformer,
Due to the high voltage applied to the leads, it is thought that barrier devices are often required not only at the connections shown in Figure 1 but also at other parts.
The barrier device of the present invention can be applied to all submerged oil leads that require such a barrier device, and it is also possible to apply the barrier device of the present invention to barrier devices that require vertical installation. It is.

In addition, there is a strong possibility that the oil-immersed shield installed at the bottom of the oil-immersed pushing of oil-immersed insulated equipment such as transformers will need to have a barrier structure with a barrier placed on the outside in ultra-high voltage conditions. Even in such a barrier device, it is also possible to use a ring-shaped spacer fitted to the submerged oil shield according to the present invention.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the connection of a 1/2-phase transformer, Fig. 2 is a schematic cross-sectional diagram of the connection part having a barrier structure, Fig. 3 is a diagram of the conventional spacer arrangement, and A is its cross-sectional view; B is a vertical cross-sectional view, FIG. 4 is a spacer arrangement diagram according to an embodiment of the present invention, A is a vertical cross-sectional view thereof, B is a cross-sectional view of A taken along the line B-B, and FIG. 5 is a partially enlarged view thereof. A is a plan view, B is a vertical cross-sectional view, FIG. 6 is a spacer provided with an oil flow hole, A is a plan view thereof, B is a cross-sectional view of A taken along line B-B, and FIG. 7A and 9A and 9B show a spacer that supports the barrier of the present invention and is divided into two parts and has various fitting parts, and FIGS. 7A and 9A,
A' is the plan view, B and B' are the front view in Figure 9, and Figure 8 is the front view.
The figure is an explanatory diagram showing the fitting procedure, and FIG. 10 is a layout diagram of a spacer provided with a reinforcing structure. 3, 3a, 3b...lead in oil; 7 (7a~7
c), 20 (20a-20c)... Barrier; 9...
...Taping, 10, 21 (21a-21c),
22a, 22b, 24, 30, 40, 50... Spacer; 11... Inner surface; 25, 26... Oil flow hole; 30a, 30b, 40a, 40b... Divided part; 31, 41... Inset part (fitting hole); 32, 42... fitting part (fitting projection); 51, 51', 51''... reinforcing material.

Claims (1)

[Claims] 1. A barrier formed by wrapping multiple layers of insulators concentrically around an oil-immersed lead, and an oil-immersed shield arranged between the oil-immersed lead and the innermost layer barrier, and an adjacent barrier, respectively. Consisting of a plurality of annular spacers with oil flow holes extending through them in the axial direction, the spacers are divided into two or more pieces along the radius line, and each of the divided surfaces is fitted with a spacer. A barrier device for an oil-immersed lead of oil-immersed insulated equipment, characterized in that a recessed portion is formed to enable connection.