JPS59155110A - Winding for natural cooling induction electric apparatus - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of the titled electric apparatus by a method wherein, in the winding for natural cooling induction electric apparatus, the guide plate for a cooling medium is provided at the upper and lower limits of the highest temperature rising part, thereby enabling to make the temperature distribution uniform. CONSTITUTION:A horizontal fluid path 3 is formed between windings by superposing a number of disc-shaped unit windings 2 in axial direction through the intermediary of spacers, a vertical fluid path 5 is formed between an insulating cylinder and a winding by arranging an insulating cylinder 4 on the inner circumferential side of the disc-shaped unit winding and the winding for a natural cooling induction electric apparatus is constituted in such a manner that a cooling medium is flown by a natural reflux through the vertical fluid path 5 and the horizontal fluid path 3. When the upper end of the winding is set at 100, an inner guide plate 6 and an outer guide plate 7 are provided in the horizontal fluid path corresponding to the upper and the lower limit positions of the range h of 325q+13<=h<=325q+38[(q) indicates the heat flow speed (w/cm<2>) on the winding surface] thereby enabling to lessen the local temperature rise of the unit winding 2 at this part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to naturally cooled induction electric appliance windings used in naturally cooled transformers, naturally cooled reactors, and the like.

[Technical background of the invention and its problems]

Conventionally, the windings used in induction electric appliances, such as transformers, are disk-shaped windings that are made up of a large number of disk-shaped unit windings stacked in the axial direction, and their cooling structure is a disk-shaped winding. Cooling medium such as insulating oil is allowed to circulate naturally through the vertical fluid passages formed inside the shaped windings and the horizontal fluid passages formed between stacks of unit windings by utilizing temperature differences. There is.

FIGS. 1 and 2 are cross-sectional views showing a cooling structure for such a disc-shaped winding. As shown in FIGS. 1 and 2, the disc-shaped winding 1 is constructed by stacking a large number of unit windings 2 in the axial direction, which are formed by winding an insulated rectangular conductor into a disc shape. In this case, a horizontal fluid path 3 is formed by disposing spacers (not shown) with an equal interval A between the stacks of each unit winding 2. An insulating tube 4 is disposed inside the disk-shaped winding 1, and an axial direction (hereinafter referred to as the height direction) of each unit winding 2 is disposed between the inner peripheral surface of the disc-shaped winding 1 and the insulating tube 4. A vertical fluid path 5 is formed that extends to.

Therefore, in such a cooling structure of the disc-shaped winding 1, the cooling medium flows through the vertical fluid path 5. from the bottom to the top of each unit winding 2 in the height direction as shown by the arrows in the figure. Each unit winding 2 can be cooled by natural circulation through the horizontal fluid path 3 and the outer side of the disc-shaped winding 1. However, in such a cooling structure for the disc-shaped winding 1, the cooling medium rising in the vertical fluid passage 5 and the outside of the disc-shaped winding 1 flows from the inner and outer peripheries of the unit winding 2 into the horizontal fluid passage 3. Therefore, a phenomenon occurs in which the cooling medium stagnates in the radial center of each unit winding 2. In particular, the cooling medium remains in the radially central portion "'X" of the unit winding 2 above the central portion in the height direction of the disc-shaped winding 1, and the temperature of this portion locally increases.

An example of these experimental results is shown in FIG. FIG. 3 shows the temperature distribution characteristics of the radial center section IIX'' of each unit winding 2 in the height direction of the disc-shaped winding 1. It has been found that the conductor of the unit winding 2 above the central part of the plate winding 1 in the height direction has a region where the temperature rise is locally high.

In other words, conventionally, the highest temperature rise in a disc-shaped winding is considered to be in the unit winding several sections below the top, and the temperature rise in this part and the average temperature rise of the winding are considered. However, the above-mentioned experimental results show that the position of the highest temperature rise part in the height direction is further down (< ), and the temperature rise value is extremely high. It was also found that the average temperature rise value of Cooling efficiency was poor because parts of the product deteriorated quickly, or unnecessary unit windings were cooled intensively.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and provides a naturally cooled induction electric winding that can average the temperature distribution in the height direction of the disc-shaped winding, improve cooling efficiency, and increase the overall winding current density. This is what we are trying to provide.

[Summary of the invention]

In order to achieve such an object, the present invention provides a disk-shaped winding in which a large number of disk-shaped unit windings are stacked in the axial direction, and a spacer is arranged between each stack to form a horizontal fluid path. In a naturally cooled induction electric winding in which an insulating cylinder is arranged on the inner circumferential side of the wire to form a vertical fluid path between them, and a cooling medium is caused to flow by natural circulation through these vertical fluid paths and each horizontal fluid path, The height direction position of the disc-shaped winding is 325q+13≦h≦325q+38 (where q is the heat flow velocity (W~) on the surface of the winding, and h is the winding when the upper end of the winding is taken as 100). An inner guide plate and an outer guide plate are provided to guide the cooling medium between the inner and outer sides of the disc-shaped winding to the horizontal fluid passages corresponding to the upper and lower limit positions of the range represented by (the line height direction position). It is characterized by the provision of

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Fourth
The figure is a cross-sectional view showing a cooling structure of a disk-shaped winding used in a transformer, and FIG. 5 is a cross-sectional view showing an enlarged part of the disk-shaped winding in FIG. Components that are the same as those in FIGS. 1 and 2 are given the same symbols and their explanations will be omitted, and only different parts will be described here. That is, in this embodiment, as shown in FIGS. 4 and 5, in each unit winding 2 constituting the disc-shaped winding 10, there is a central portion in the winding height direction where the temperature rise value is locally large. Among the horizontal fluid passages 3 formed between the unit windings 2 in the upper portion, a disk-shaped horizontal fluid passage 3 is formed in the horizontal fluid passage 3 corresponding to the upper and lower limit positions of the range where the temperature rise value becomes large. The structure is such that inner and outer oil flow guide plates 6.7 as shown in FIG. 6 are provided to guide the cooling medium between the inside and outside of the winding 10. Here, the height direction position of the disc-shaped winding 10 where the inner oil flow guide plate 6 and the outer oil flow guide plate 7 are provided is as follows (
1) These are the upper and lower limits of the range applicable to the formula.

325q+13≦h≦325q+38 ・・・・・・
(1) However, in the formula, q is the heat flow velocity (fair) on the surface of the winding, and h is the position in the winding height direction when the upper end of the disc-shaped winding 10 is taken as 100.

Therefore, in a naturally cooled induction electric winding having such a configuration, the cooling medium flows through the vertical fluid path 5 formed on the inner circumferential side of the disc-shaped winding 10 by the insulating cylinder 4 as shown by the arrow in the figure.
and a horizontal fluid path 3 between each unit winding 2 and a disc-shaped winding 1
0 flows upward from the lower part in the height direction of the disc-shaped winding 10 through the outer circumferential side of the winding 10, and further reaches the part located above the center part in the height direction of the winding, that is, the lower limit position of the range where the temperature rise value becomes large. , the disc-shaped winding 1 is connected by the outer oil flow guide plate 7.
Since the outer flow path of 0 is blocked, the cooling medium that was flowing through the vertical fluid path 5 inside thereof flows through the horizontal fluid path 3 from the inside to the outside of the disc-shaped winding '10. When the coolant reaches above the inner oil flow guide plate 6, which is provided at the upper limit of the range where the temperature rise value increases, the coolant flows through the vertical fluid passage 5 and the inner flow passage inside the disc-shaped winding 10. . As a result, the cooling medium does not remain in the radial center of the unit winding 20 located above the center in the winding height direction, so the local temperature rise of the unit winding 2 in this area is alleviated. The temperature distribution in the height direction of the disc-shaped winding comb 10 is averaged.

FIG. 7 is a characteristic diagram obtained experimentally for the temperature distribution at the radial center of each unit winding 2 in the height direction of the disc-shaped winding 10 in this embodiment. As can be seen from this experimental result, since there is no local temperature rise above the center of the winding in the height direction of the disc-shaped winding 10, deterioration of the insulation covering of the rectangular conductor can be reduced.

Furthermore, since it is possible to reduce the average temperature rise value of the windings, it is possible to improve cooling efficiency and increase the overall winding current density.

〔Effect of the invention〕

As described above, according to the present invention, an inner guide plate and an outer guide plate are provided in the horizontal fluid path between unit windings corresponding to the upper and lower limit positions of a specific range in the height direction of the disc-shaped winding. The structure allows the cooling medium in this part to flow between the inside and outside of the disc-shaped winding, which averages out the temperature distribution in the height direction of the disc-shaped winding and improves cooling efficiency. Therefore, it is possible to provide a naturally cooled induction electric winding that can increase the current density of the entire winding.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the configuration of a conventional naturally cooled induction electric appliance winding; Figure 2 is an enlarged sectional view of a part of Figure 1;
The figures are a characteristic diagram showing the winding temperature distribution of Fig. 1, Fig. 4 is a sectional view showing an embodiment of the present invention, Fig. 5 is an enlarged sectional view of a part of Fig. 4, and Fig. 6 This figure is a plan view of the oil flow guide plate in the same embodiment, and FIG. 7 is a characteristic diagram showing the winding temperature distribution of FIG. 4. 1.10...Disc-shaped winding, 2...Unit winding, 3...
・Horizontal fluid path, 4... Insulating cylinder, 5... Vertical fluid path,
6゜7...Inner and outer oil flow guide plates. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Yudo J:J7 ('C) Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] An inner periphery of a disc-shaped winding in which a large number of disc-shaped unit windings are stacked in the axial direction, and a spacer is arranged between each stack to form a horizontal fluid path. In a naturally cooled induction electric winding in which an insulating tube is disposed on the side and a vertical fluid path is formed therebetween, and a cooling medium is caused to flow by natural circulation through these vertical fluid paths and each horizontal fluid path, the disk-shaped As the height direction position of the winding, 525q+13≦h≦325q+38 (where q is the heat flow velocity on the winding surface (W/li), and h is the height of the upper end of the winding at 10
A cooling medium is supplied between the inside and outside of the disc-shaped winding in the horizontal fluid path between the unit windings corresponding to the upper and lower limit positions of the range represented by A naturally cooled induction electric appliance winding characterized by having a structure in which an inner guide plate and an outer guide plate are provided for guiding the flow.