JPH0616455B2 - Multiple cylindrical winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention comprises a plurality of concentrically arranged cylindrical windings used as windings for induction electric equipment such as transformers and reactors. It relates to multiple cylindrical windings.

(Prior Art) Generally, as a high-voltage winding of a high-voltage, large-capacity transformer, a multi-cylindrical winding with excellent winding workability is used together with an interleaved disk winding with excellent potential distribution in the winding. ing.
(Japanese Patent Publication No. 44-1724, Japanese Patent Publication No. 53-4364)
As shown in FIG. 2, this multiple cylindrical winding is composed of a plurality of concentric cylindrical windings 1 formed by winding a coil conductor in a cylindrical shape. Each cylindrical winding 1a, 1
b, ..., 1g are alternately connected to adjacent cylindrical windings at the upper end and the lower end and are connected in series in series, and the multiple cylindrical windings 10 thus configured together with the low-voltage windings 20 have an iron core (Fig. (Not shown). Such a multiple cylindrical winding 1
In 0, the basic insulating cylinder 3A having the same thickness is used as the insulation of each cylindrical winding 1 only for the innermost cylindrical winding 1a facing the low-voltage winding 20, and the other cylindrical windings 1b to 1b. The interlayer insulator 3B provided inside 1 g is formed in a tapered shape so that its thickness increases as the potential difference between adjacent cylindrical windings increases. The interlayer insulator 3B is usually formed by a taper winding method in which insulating paper such as ordinary kraft paper is cut into a predetermined size, is temporarily wound, and is sequentially wound into a predetermined shape. Roll-formed interlayer insulation 3B
Is formed by bending while maintaining a predetermined oil passage at the end of the cylindrical winding 1.

In the figure, numeral 5 is a shield which is arranged on the outermost side of the multiplex cylindrical winding 10 and which applies a potential to the cylindrical winding 1 or a high voltage lead wire (not shown). Further, 2 is an electrostatic shield ring device. When the interlayer insulator 3B is applied by the taper winding method, conventionally, as shown in FIG. 2 and FIG. 3, between the cylindrical winding 1 and the interlayer insulator 3B, the tact piece ( Oil passage 4 for winding winding formed by (not shown)
Therefore, it is wound while keeping an oil gap of a predetermined size. The oil gap size of the oil passage 4 is constant from the lower end to the upper end of the winding.

(Problems to be Solved by the Invention) By the way, such an interlayer insulator 3B usually has a thickness of 50 μm to 1 μm.
About 100μ of thin insulating paper such as kraft paper with a thickness of about 00μ
It is formed by winding about 300 times, and the number of winding times per layer of the coil conductor is greater than 30 to 80, and the insulating paper winding work in winding production is troublesome and the working time is long. In particular, since the coil conductor winding work and the insulating paper winding work are alternately performed, the coil conductor must be cut after each layer winding, and the winding cannot be continuously wound, resulting in very poor work efficiency. Further, a special processing device is required to process the insulating paper while continuously tapering, and the work space is also large. Further, as shown in FIG. 3, since one side surface of the cylindrical winding 1 is directly in contact with the interlayer insulator, cooling of the cylindrical winding with oil has a structure with only one side surface on the opposite side. Cooling efficiency is poor. Therefore, it is necessary to reduce the current density as compared with the cylindrical winding, and there is a drawback that the size and weight are increased as a whole.

An object of the present invention is to provide a multiple cylindrical winding that facilitates winding work of a coil conductor, improves a winding space factor, and further improves cooling performance.

[Structure of the Invention] (Means for Solving the Problems) In the multiple cylindrical winding according to the present invention, a wedge-shaped duct piece made of a plurality of tapered insulators is provided between the cylindrical windings of each layer in the circumferential direction. A wedge-shaped duct piece made of a predetermined insulating material is arranged in the circumferential direction to secure a predetermined insulating dimension and oil passage for assembly.

(Function) According to the multi-cylinder winding according to the present invention as described above, conventionally, there is a complicated insulating structure in which an oil passage having a certain size and an interlayer insulating material in which insulating paper is wound in a taper shape are combined. ,
By using the tapered duct piece, the winding work of the insulating paper is omitted, and the winding work can be continuously performed, resulting in a simple structure.

(Example) Hereinafter, an example shown in FIG. 1 of the present invention will be described.
FIG. 1 shows the structure of a multiple cylindrical winding according to the present invention. It is composed of a plurality of concentric cylindrical windings 1a, 1b, ..., 1g formed by winding a coil conductor in a cylindrical shape. Each cylindrical winding 1 and adjacent cylindrical windings are alternately connected at the upper end and the lower end to be connected in series in series, and the multiple cylindrical winding 10 configured as described above is provided with an iron core (not shown) together with the low voltage winding 20. ) Is attached to. Then, a tapered wedge-shaped insulator having a large thickness dimension on the side where the conductor is wound between the layers of the plurality of concentric cylindrical windings 1a to 1g and wound on the next layer, for example, a press board. A plurality of duct pieces 6 each consisting of is installed in the circumferential direction of the winding, and the winding of the winding and the arrangement of the taper duct pieces are alternately repeated in multiple layers.

In the multiplex cylindrical winding having such a configuration, for example, only the work of disposing the duct piece 6 is required every time the winding of one layer of the cylindrical winding 1a is completed, and the cylindrical winding 1b of the next layer is formed.
Can be continuously wound on the duct piece in the opposite winding axis direction without cutting the conductor. Further, since the work of winding the interlayer insulating paper is omitted, a taper processing device for the insulating paper is not required and the working space is reduced. Also,
The equivalent insulating dimension between layers does not decrease because there is no layer of an interlayer insulator having a large dielectric constant, and the electric field stress at the winding ends decreases, so that the dimension of the oil passage 4 can be reduced.
Further, since both sides of the cylindrical winding 1 are in contact with the cooling (insulating) medium, the cooling efficiency of the winding is almost doubled as compared with the case of winding a conventional interlayer insulator, and the temperature rise of the winding can be suppressed to a low level. it can.

Further, as shown in FIG. 1, the interlayer barrier 71 and the angle ring 72 are used to prevent the dielectric strength from decreasing as the dimension of the interlayer oil passage 4 increases, and are used to prevent this, and the operating voltage of the winding is particularly high. It will be effective if. The interlayer barrier 71 is inserted into a slit groove provided in the duct piece 6, forms a tubular shape along the cylindrical winding 1, and is attached together with the duct piece. The angle ring 72 only needs to be inserted into the slit of the duct piece 6 after the winding of the entire winding is completed, and it has a simple structure without the need to bend many wound insulating papers as in the conventional case.

[Effects of the Invention] As described above, according to the present invention, a plurality of concentric cylindrical windings are provided, and adjacent upper and lower windings of the cylindrical winding are alternately connected to connect the whole in series. In the multi-layered cylindrical winding, a wedge-shaped duct piece made of a plurality of tapered insulators is arranged between the cylindrical windings of each layer to form a predetermined interlayer insulation dimension and oil passage between the cylindrical windings. As a result, the winding work of the coil conductor can be facilitated, the space factor of the winding can be improved, and the multiple cylindrical winding having further improved cooling characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional perspective view showing an embodiment of a multiplex cylindrical winding according to the present invention, FIG. 2 is a sectional view showing the structure of a conventional multiplex cylindrical winding, and FIG. 3 is a similar multiplex cylindrical winding. It is a partially expanded view which shows an edge part structure. 1a, 1b, ..., 1g ... Cylindrical winding, 3A ... Basic insulating cylinder, 3B ... Interlayer insulator, 4 ... Oil passage, 5 ... Shield, 10 ... Multiple cylindrical winding, 71 ... Interlayer Barrier, 72
...... Angle ring.

Claims (2)

[Claims] 1. A multi-layered cylindrical winding having a plurality of concentric cylindrically wound cylindrical windings, wherein adjacent cylindrical windings are alternately connected at upper and lower ends and are connected in series. A multi-cylinder characterized by arranging a plurality of wedge-shaped duct pieces made of a tapered insulator between windings to form a predetermined interlayer insulation dimension and oil passage between each winding. Winding. 2. The multiplex according to claim 1, wherein the duct piece is provided with a slit along the winding axis direction, and a barrier made of an insulating material dividing the oil passage into two is inserted into the slit. Cylindrical winding.