JPS641924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to static induction electrical equipment, and more specifically, one end of the line is connected to a power transmission line, and the other end is a neutral point that is directly or effectively grounded. The present invention relates to static induction electrical equipment such as transformers having high voltage windings having ends.

An example of a transformer will be described below.

Conventionally, there have been transformers of this type as shown in FIGS. 1, 2, and 3. In FIG. 1, a low voltage winding 2 wound around the outer periphery of the leg 1 of the closed circuit iron core is connected to the load side, and a high voltage winding 3 wound concentrically around the outer periphery of the low voltage winding 2 is connected to the load side. , one end of the line end 4 is connected to the power transmission line, and the high voltage winding 3
The other end, neutral point end 5, is directly grounded or effectively grounded. The main insulating layer 6 provided in the radial space between the low voltage winding 2 and the high voltage winding 3 has a vertical spacer 7
and insulating tubes 8 are alternately arranged concentrically. Reference numeral 9 indicates an output lead of the low voltage winding 2. As shown in Fig. 2, the high-voltage winding 3 consists of a plurality of disk-shaped coil sections 10, each of which is made by winding an insulated rectangular copper wire several times in the radial direction, and having equal inner and outer diameters, which are laminated in the axial direction. However, a center-oriented spacer 11 is inserted between opposing coil sections 10.
The center spacer 11 is for maintaining cooling dust and insulation spacing of the coil section 10. Further, as shown in FIG. 3, a groove 12 is formed in the center-oriented spacer 11, and the vertical spacer 7 passes through this groove 12, so that the center-oriented spacer 11 is held by the vertical spacer 7.

Since the conventional transformer was constructed as described above, the main insulation layer 6 between the low voltage winding 2 and the high voltage winding 3
Since the distance d is constant in the axial direction, when the neutral point end 5 of the high voltage winding 3 is directly or effectively grounded as described above, the neutral point end 5 is connected to the low voltage winding 2.
However, the transformer is over-insulated and the outer diameter of the high-voltage winding 3 is increased, resulting in an increase in the size of the transformer and an increase in cost.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and divides the high voltage winding into several types of coil section groups with different inner diameters to ensure the necessary insulation distance for each coil section group. At the same time, a group of coil sections with a large inner diameter is placed at the line end of the high-voltage winding, and a group of coil sections with a small inner diameter is placed at the neutral point end of the high-voltage winding, in order to make the main insulation layer effective. The object of the present invention is to provide a static induction electric device that can be downsized by reducing the outer diameter of the high-voltage winding.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 4, the same parts as in FIG. 6, with a predetermined insulation distance secured therebetween. In other words, the coil section group arranged at the line end 4 of the high voltage winding 3a has a large inner diameter coil section group with the main insulation distance d secured, and the high voltage winding 3
The coil sections arranged at the neutral end 5 of the high voltage winding 3a have a higher insulation class than the line end 4 of the high voltage winding 3a because the neutral end 5 of the high voltage winding 3a is directly or effectively grounded. It is formed by a group of coil sections with a small inner diameter that ensures a commensurate insulation distance in the main insulation layer 6, and the high voltage winding 3a
The coil sections between the line end 4 and the neutral end 5 of the high voltage winding 3a are divided into coil sections from an insulation class intermediate between the insulation class of the line end 4 and the insulation class of the neutral end 5 of the high voltage winding 3a. It is composed of a group of coil sections having an inner diameter that can ensure the necessary insulation distance for the group within the main insulating layer 6. Furthermore, since the insulating cylinder 8a and the vertical spacer 7a in the main insulating layer 6 are arranged according to the insulation class of each coil section group,
It is thicker in the coil section group on the line end 4 side of the high voltage winding 3a, and thinner in the coil section group on the neutral point end 5 side of the high voltage winding 3a. As described above, the high voltage winding 3a is characterized in that the high voltage winding 3a is divided into coil section groups and deviated in the radial direction of the winding in order to relate the high voltage winding 3a to its insulation class. In addition, a coil section 10a is formed into a disk shape by winding an insulated rectangular copper wire several times in the radial direction.
are fixed in the axial direction of the windings by center-oriented spacers 11a while maintaining the required cooling duct and insulation spacing. Therefore, as shown in FIG.
In addition to 2a, another through groove 13 is continuously formed, a vertical spacer 7a is passed through the through groove 12a, and a spacer 7a is inserted into the through groove 13 to ensure an insulation distance between each coil section group. An auxiliary vertical spacer 14 is provided through the vertical spacer 7a to fix coil sections having different inner diameters to the vertical spacer 7a. Further, the auxiliary vertical spacer 14 is adhesively fixed to the vertical spacer 7a. To explain in more detail, the center-oriented spacer 11a inserted at the boundary between coil sections having different inner diameters in FIG.
The details of the configuration are shown in FIG. That is, spacer pieces 21b, which are not provided with the through groove 13 of the auxiliary vertical spacer 14 in FIG. By configuring a spacer 11a with a center-oriented spacer 11a and inserting an auxiliary vertical spacer 14 of an arbitrary thickness into this through groove 13, it is possible to easily secure the high-voltage coil section groups shown in FIG. 7 having different inner diameters precisely in the axial direction. Can be formed.

In the above embodiment, the line end 4 of the high voltage winding 3a is arranged at the axial center of the high voltage winding 3a, but as shown in FIG. above, below, or 10th
It may be arranged on either one of them as shown in the figure. Further, in the above embodiment, the present invention is applied to a transformer, but a reactor may also be used, and the same effect can be obtained.

As described above, according to the present invention, the high-voltage coil section group is partially offset in the winding radial direction and accurately arranged according to its insulation class, so that the high-voltage winding and the low-voltage winding can be connected to each other. It is possible to reduce the size of the main insulating layer between the two. This has the special effect of reducing the size and cost of static induction electrical equipment.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of the main part of the conventional device, Fig. 2 is a partially enlarged sectional view of Fig. 1, Fig. 3 is a view taken in the - arrow direction of Fig. 2, and Fig. 4 is an embodiment of the present invention. A schematic sectional view of the main part of the example, FIG. 5 is a partially enlarged sectional view of FIG. 4,
6 is a view taken in the direction of the - arrow in FIG. 5, FIG. 7 is a partially enlarged cross-sectional view of FIG. 5, and FIG. 8 similarly shows the center-oriented spacer; FIG. , No. 9
The figure is also a schematic cross-sectional view of main parts of another embodiment, No. 10
The figure is a schematic cross-sectional view of the main parts of another embodiment. 1...Legs of closed circuit iron core, 2...Low voltage winding, 3a...
High voltage winding, 4... Line end, 5... Neutral point end, 6... Main insulating layer, 7a... Vertical spacer, 8a... Insulating tube, 9...
Output lead, 10a...Coil section, 11
a... Center facing spacer, 12a, 13... Penetration groove, 1
4... Auxiliary vertical spacers, 21a, 21b, 21c...
spacer piece. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. At least one pair of low-voltage winding and high-voltage winding are arranged concentrically on the legs of a closed circuit core, and the high-voltage winding is arranged to surround the low-voltage winding with a main insulating layer interposed therebetween. In a stationary induction electric device in which a plurality of coil sections are stacked with a center-oriented spacer interposed therebetween to ensure an insulation gap and a cooling gap, the coil sections are stacked in a plurality of types with different inner diameters and the same outer diameter. The high voltage winding is divided into coil section groups, with the coil section group having a large inner diameter at the line end and the coil section group having a small inner diameter at the neutral point end; and the center-oriented spacer has a through groove for an auxiliary vertical spacer that maintains an insulating interval between each of the coil section groups, which is continuous with a through groove for a vertical spacer fixed to the coil section group, and has a different inner diameter. The center-oriented spacer inserted at the boundary of the coil section group forms the through grooves for the vertical spacer and the auxiliary vertical spacer above and below a spacer piece in which only the through groove for the vertical spacer is formed. A stationary induction electric device characterized in that it is formed by adhesively fixing separate spacer pieces.