JPH02254706A - Multicylindrical winding - Google Patents

Abstract

PURPOSE:To facilitate the winding work of a coil conductor and to improve the winding space factor and the cooling efficiency of the title winding by a method wherein the vertical oil passage between layers is made small on the side of edge part where the connection part of a cylindrical winding is present and it is made larger on the edge part located on the opposite side, and also a horizontal oil passage is provided on the edge part of the cylindrical winding. CONSTITUTION:A plurality of wedge-shaped duct pieces 6 are provided in circumferential direction of the windings 1a to 1g between each layer of cylindrical windings 1a to 1g, and the winding work of a winding and the arrangement of the taper duct pieces 6 are alternately repeated for formation of a multilayer structure. Also, a spacer is arranged in the direction of circumference on the edge part on the side where the connection part of the cylindrical windings 1a to 1b is present, and a horizontal oil passage 4b is partially provided on the cylindrical winding 1a to 1g. As the duct pieces 6 are used as above-mentioned, a winding work of the windings can be conducted continuously, a single-side cooling structure is changed to a double-side cooling structure. As the horizontal oil passage 4b is provided between conductor windings, the size of the vertical oil passage 4a can be made very small, and the size of the winding in radial direction can be reduced sharply. As a result, the winding operation of the coil conductor is facilitated, and the space factor of winding and cooling characteristics can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a multiplex cylindrical winding used as a winding for induction electrical equipment such as a transformer or an axle.

(Prior art) In general, high-voltage windings for high-voltage, large-capacity transformers include interleaved disk windings with excellent potential distribution within the windings and multiple cylindrical windings with excellent winding workability. It is used. (
Special Publication No. 44-1724, Special Publication No. 53-43646
As shown in FIG. 2, this multiplex cylindrical winding is composed of a plurality of concentrically arranged cylindrical windings 1a to 1g made by winding a coil conductor in a cylindrical shape. Each cylindrical winding 1
a to 1g are connected in series by alternately connecting the upper and lower ends with adjacent cylindrical windings, and the multiple cylindrical windings 10 configured in this way are connected to an iron core (not shown) together with the low voltage winding 20. ). Such multiple cylindrical winding 1
0, each cylindrical winding 18 to 1 g is insulated with a low voltage winding 20
A basic insulating cylinder 3a having the same thickness throughout the axial direction of the winding is used only for the innermost cylindrical winding 1a facing the cylindrical winding 1a, and interlayer insulating material 3b is provided inside the other cylindrical windings 1b to 1g.
is formed in a tapered shape so that its thickness increases as the potential difference between adjacent cylindrical windings increases.

The interlayer insulating material 3b is usually formed by a Taber winding method in which insulating paper such as ordinary raft paper is cut into predetermined dimensions and pre-rolled, and then sequentially wound into a predetermined shape. Each of the wound interlayer insulators 3b is bent at a predetermined randomness at the end of the cylindrical winding. A shield 5 is disposed at the outermost side of the multiple cylindrical winding 10 and applies a potential to the cylindrical winding 1 or a high voltage lead wire (not shown). Further, 2 is an electrostatic shield ring.

When applying the interlayer insulating material 3b using the Taber winding method, conventionally, as shown in FIG. The coil is wound while maintaining an oil gap of a predetermined size, which becomes the draw 4 for cooling the winding. The oil gap size of this drawing 4 is constant from the lower end to the upper end of the winding.

(Problem to be Solved by the Invention) By the way, such an interlayer insulator 3b usually has a thickness of 50μ to 1
Thin insulating paper such as kraft paper with a thickness of about 100μ
It is formed by winding about 300 times, which is larger than the 30 to 80 turns per 1M of the coil conductor, and the work of winding the insulating paper in winding production is troublesome and takes a long time. In particular, since the coil conductor winding work and the insulating paper winding work are performed alternately, the coil conductor must be cut after each layer winding is completed, so the winding wire cannot be wound continuously, resulting in very low work efficiency. . Additionally, special processing equipment is required to process insulating paper while continuously tapering it, and the work space is also large. Furthermore, the cylindrical winding 18~
Since one side of 1g is in direct contact with the interlayer insulator, the cylindrical winding is cooled by oil only on the opposite side, resulting in poor cooling efficiency.

Also, the vertical drawing 4 on the end side where the connection part of the cylindrical winding exists
A has the same potential from an electrical insulation point of view, and although it is not necessary, an oil gap of a predetermined size is ensured from the viewpoint of cooling. This vertical drawing dimension is proportional to the number of layers of the cylindrical winding,
Since this is added to the radial dimension of the winding, not only does the size of the entire winding become larger, but also the size of the core to which the winding is attached becomes larger, resulting in an increase in weight.

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

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the multiple cylindrical winding of the present invention has a vertical draw between the layers that is small at the end side where the connection part of the cylindrical winding exists. It is characterized by increasing the size at the opposite end and providing a horizontal lottery at the end of the 681 winding.

(Function) According to the multiple cylindrical winding of the present invention, the conventional complicated insulation structure combining an oil pipe of a fixed size and an interlayer insulator made by winding insulating paper in a tapered shape can be replaced with a tapered one. By using the duct piece, the work of winding the insulating paper is omitted and continuous winding work is possible, and the structure changes from a single-sided cooling structure to a double-sided cooling structure. Furthermore, by providing a horizontal draw between the end conductor turns of the cylindrical winding, it is possible to minimize the vertical draw on the end side where the connection part is located, and the radial dimension of the winding can be reduced to a large width. reduced to

(Example) Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional perspective view of one embodiment of the present invention.

The multiplex cylindrical winding 10 of this embodiment is composed of a plurality of concentrically arranged cylindrical windings 18 to 1g each formed by winding a coil conductor in a cylindrical shape. Each of the cylindrical windings 18 to 1g is connected in series with the adjacent cylindrical windings by alternately repeating connections at the upper and lower ends, and the multiple cylindrical windings 10 configured in this way are connected as low voltage windings (not shown). It is also attached to an iron core (not shown). Then, a plurality of concentrically arranged cylindrical windings 1a~
A conductor crosses between each layer of 1 g, and a plurality of wedge-shaped insulators 6 made of presspods are attached in the circumferential direction of the winding, and the thickness of the side to be wound to the next layer is increased. Then, the winding of the winding and the arrangement of the Taber duct pieces 6 are repeated alternately over multiple layers.

In addition, at the end of each cylindrical winding where the connection part is present, a spacer made of an insulator having a predetermined thickness, such as a press board, is wound between the conductor turns in multiple turns at a predetermined interval in the circumferential direction. A horizontal drawing 4b is provided partially on the cylindrical winding.

In the multi-layer cylindrical winding having such a configuration, for example, it is only necessary to arrange the duct toses 6 each time the winding of the cylindrical winding 1a of the negative layer is completed, and the operation of cutting the conductor of the cylindrical winding 1b of the next layer is only required. It is possible to continuously wind the wire on the duct 6 in the direction of the winding axis on the opposite side without having to do so. Furthermore, by omitting the work of winding the interlayer insulating paper, a device for tapering the insulating paper is also unnecessary, and the work space is also reduced. Furthermore, since the interlayer insulating layer with a large dielectric constant is eliminated, the equivalent insulation dimension between the layers does not become smaller, and the electric field stress at the end of the winding becomes smaller, making it possible to reduce the size of the lottery 4.

In addition, by passing the horizontal draw 4b at the end of the cylindrical winding and introducing oil as a cooling medium from the large interlayer vertical draw 4a facing the connection, it is possible to omit or greatly reduce the interlayer vertical draw at the connection. Become. Although the height of the winding becomes slightly larger by providing the horizontal draw 4b, since the dimension of the vertical draw 4a between the layers is added to the radial dimension of the winding in proportion to the number of layers of the cylindrical winding, the connection Omitting or greatly reducing the vertical drawing 4a between the layers can greatly contribute to reducing the size of the entire winding. In particular, as the working voltage of the winding becomes higher, the number of layers of the cylindrical winding increases, so the size is further reduced.

Furthermore, since both sides of each m-circular winding 1a to 1g are in contact with the cooling (insulating) medium, the cooling efficiency of the winding is almost doubled compared to the case of winding with a conventional interlayer insulator, which reduces the temperature rise of the winding. can be kept low.

Roughly speaking, angle rings 8 integrally formed with the interlayer barrier 7 are arranged vertically alternately between the duct pieces 6 arranged between the windings, thereby improving the withstand voltage between the windings and reducing the pressure at the ends of the windings. Corona can be prevented.

[Effects of the Invention] As explained above, according to the multiple cylindrical winding of the present invention,
Circle IP for each layer! By arranging a plurality of wedge-shaped duct pieces made of tapered insulators between the l1 windings and wrapping a spacer made of insulators between the conductor turns at the connection end of each cylindrical winding, each cylinder is Since predetermined interlayer insulation dimensions and drawings are formed between the windings, the winding work of the coil conductor is made easier, the winding space factor is improved, and the cooling characteristics are further improved. Obtainable.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional perspective view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional multiplex cylindrical winding. 18~1g...Each cylindrical winding 2...Electrostatic shield link 3a...Basic insulation tube 3b...Interlayer insulation tube 4a...Vertical drawing 4b...Horizontal drawing 5...Shield 6 ...Duct piece 7...Interlayer barrier 8...Angle ring 10...Multiple cylindrical winding 2G...Low voltage winding (8733) Agent Patent attorney Yoshiaki Inomata (and others)
1 person) Figure Figure

Claims (1)

[Claims] In a multiple cylindrical winding that has cylindrical windings wound in multiple layers in a concentric cylindrical shape, and in which adjacent cylindrical windings are connected alternately at the upper and lower ends and the whole is connected in series, the vertical oil passage between the layers is cylindrically wound. A multiplex cylindrical winding wire characterized in that it is small at the end side where the wire connection part is present and large at the opposite end side, and a horizontal oil path is provided at the end of the cylindrical winding wire.