JPH01183108A - Induction electric apparatus disk winding - Google Patents

Abstract

PURPOSE:To make the oil flow in each horizontal cooling path at the same rate, by setting the vertical cooling path on the side of the inlet for insulation oil wider than that on the side of the outlet for the insulation oil in one cooling area. CONSTITUTION:In each cooling area formed by an inner stopper 10 and an outer stopper 11, the width l1 of a vertical spacing member on the side of the outlet for an insulation oil is set about 3-6mm, and the width l2 of that on the side of the inlet for the insulation oil is set about 1-3mm larger than that on the side of the outlet. Therefore, the vertical cooling path 13 on the side of the outlet is about 3-6mm wide and the vertical cooling path 14 on the side of the inlet is about 1-3mm wider than that on the side of the outlet to achieve an uniform flux 15 in each path as shown by the arrow of broken lines. This makes the oil flow in each horizontal cooling path flow at the same rate to perform the uniform cooling effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an induction electric disk winding that is cooled by natural convection of oil.

(Prior Art) Conventionally, a disk winding used as a winding of an induction electric device such as a transformer is constructed as shown in FIG. That is, a plurality of disc windings 3 each formed by winding a wire conductor between an inner insulating cylinder 1 and an outer insulating cylinder 2 are stacked in multiple stages at equal intervals in the axial direction, and each disc winding is stacked at equal intervals in the axial direction. It is constructed by connecting the wires in series with each other. Between each disc winding 3, a plurality of semi-spaced pieces 4 are arranged radially at equal intervals, and each disc winding 3
A radial horizontal cooling passage 5 is formed between the inner and outer insulating cylinders 1 and 2 and each of the disk windings 3, and vertical spacing pieces 6 and 7 are provided at positions corresponding to the horizontal spacing pieces. An inner vertical cooling passage 8 and an outer vertical cooling passage 9 communicating with the horizontal cooling passage 5 are formed between the disc winding 3 and the inner and outer insulating cylinders 1 and 2, respectively. Insulating oil and QK are stored in a tank (not shown), and the insulating oil is circulated in each cooling path by natural convection of the insulating oil to cool the windings.

In order to further enhance the cooling effect of this type of disc winding, the fourth
As shown in the figure, an inner blocker 10 and an outer blocker 11 are installed along the entire circumference of every several stages of the disc winding so that one cooling zone is formed by several stages of the disc winding 3. The vertical cooling passages 8 and 9 are alternately provided and are alternately closed on the inside and outside.

Therefore, the insulating oil inlet and outlet of the insulating oil are reversed inward and outward in each cooling zone, and the insulating oil flows between each disc winding IW3 in a zigzag pattern, thereby efficiently cooling the entire winding. ing.

(Problem to be Solved by the Invention) However, even in the disk winding having the above structure, there is a certain area partitioned by the inner blocker 10 and the outer blocker 1.
Looking at the flow of insulating oil branching into each horizontal cooling passage 5 in the two cooling zones, it is found that the oil flow in the upper horizontal cooling passage 5, which is not necessarily uniform and is generally close to the date of the insulating oil spill. The velocity is very small compared to the oil flow velocity in the lower horizontal cooling passage 5 near the insulating oil inlet. That is, if we look at the oil flow velocity distribution in each horizontal cooling passage 5 in one cooling zone, as shown by the dotted arrow 12 in FIG. 4, it becomes smaller as it approaches the insulating oil outlet. ing. Therefore, the disk winding 3 placed near the inlet
Compared to the above, the disk winding 3 placed near the outlet was not sufficiently cooled, so we took the trouble to install inner and outer plugs 10 and 11 to allow insulating oil to pass through the entire winding in a zigzag pattern. However, in each cooling zone, the expected cooling effect of each disc winding 3 cannot be obtained, so it is not possible to equalize the winding temperature rise, and in each cooling zone This has the disadvantage that an excessive temperature rise occurs in some parts, deteriorating the winding insulation and shortening the life of the transformer.

As a countermeasure for such problems, it is possible to increase the cross-sectional area of the wire conductor forming the disc winding 3 to lower the current density, and to increase the current density by increasing the current density by increasing the cross-sectional area of the wire conductor forming the disc winding 3. It is also possible to use a winding cooling design, but either method has the drawback of making the transformer larger.

The present invention eliminates the above-mentioned drawbacks, uniformizes the oil flow velocity of each horizontal cooling path in each cooling zone without increasing the size, and enables induction electric disk winding to achieve effective and uniform cooling. The purpose is to obtain.

[Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides blocking plugs alternately inside and outside along the entire circumference of the disc winding in the inside and outside vertical cooling paths. In an induction electric winding in which an insulating fluid is made to flow in a zigzag pattern, the width of the insulating oil inlet side cooling path is 1 to 3 times larger than the width of the insulating oil outlet side vertical cooling path in one cooling zone.
The vertical spacing piece is characterized in that the width of the vertical spacing piece is adjusted so that the width is increased by about 100 mm.

(Function) This adjusts the flow path resistance in each cooling zone, equalizes the oil flow velocity in each horizontal cooling path, and cools the disc winding effectively and uniformly.

(Example) An embodiment of the present invention will be explained below with reference to FIG. I will clarify. In the figure, the same parts as in FIG. i are indicated by the same reference numerals.

In the disc winding of the present invention, a plurality of disc windings 3 made by winding a KX-ray conductor between an inner insulating cylinder 1 and an outer insulating cylinder 2 are stacked in the axial direction, and each disc winding 3 is stacked in the axial direction. It is constructed by connecting the wire to the wire.

A plurality of horizontally spaced pieces are arranged radially at equal intervals between each disc winding 3, forming a radial horizontal cooling path 5a between each disc winding 3, and further insulating the inner and outer parts of the disc winding 3. Vertical spacing pieces are provided between each of the cylinders 1 and 2 and the disc winding 3 at positions corresponding to the horizontal spacing pieces, so that the disc winding 3 and the inner and outer insulating cylinders 1
, an inner vertical cooling passage 8 communicating with the horizontal cooling passage 5jL between the
, and an outer vertical cooling passage 9 are formed, respectively.

In the inner vertical cooling path 8 and the outer vertical cooling path 9 configured in this way, the disk winding 11A3 is arranged every several stages around the entire circumference of the disk winding 3? 8, the inner plug 10 and the outer plug 1 are installed alternately. In the present invention, the width of the vertical spacing piece on the outlet side of the insulating oil in each cooling zone formed in the inner plug 1o and the outer plug 11 is 1. 3～
The width t2 of the vertical spacing piece on the insulating oil inlet side is about 1 to 3 mm larger than that on the outlet side. The width of the vertical cooling passage 13 on the outlet side is approximately 3 to 610 mm, and the width of the vertical cooling passage 14 on the inlet side is 1 to 3 mm wider than the width of the outlet side.
It becomes slightly larger.

When insulating fluid flows through the disk windings configured in this way, in each cooling zone, the flow resistance is large because it flows through the narrow vertical cooling path in the lower horizontal flow path; In the upper horizontal cooling path, the flow path resistance is reduced because the fluid flows for a longer length through the wide vertical cooling path.

Here, the relationship between the width of the vertical cooling path and the flow rate was experimentally determined and the results are shown in FIG. The width of the vertical cooling path is 311111
If it is below this level, the flow path resistance will increase rapidly and the fluid temperature will rise, which is not preferable. Further, since the flow rate is approximately constant over about 6 m, even if the widths of the vertical cooling passages on the inlet side and the outlet side are different, there is no significant effect on the flow path resistance.

Therefore, if the width of the vertical cooling passage on the exit side of one cooling section is made larger than the former by about 1 to 311111, the flow resistance as described above can be obtained, and a uniform flow velocity distribution as shown by the dotted line arrow in Fig. 1 can be obtained. 15 is obtained. Although FIG. 2 shows an example of insulating oil, almost the same relationship applies to other insulating fluids. As a result, it is possible to obtain a uniform cooling effect not only in each cooling zone but also in the entire disc winding, and it is possible to eliminate the inconvenience of excessive temperature rise in some parts of the winding. This makes it possible to increase the current density by reducing the cross-sectional area of the strand conductor, thereby improving the cooling effect and making it smaller and lighter.

By the way, the same effect can be obtained even if the width of the vertical cooling path is adjusted by changing the thickness of the inner and outer insulating tubes 1h and 2m for each cooling zone, as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, a plurality of disc windings are arranged between the inner and outer insulating cylinders, and a plurality of horizontal spacing pieces are interposed between each disc winding. forming a horizontal cooling path, and interposing a plurality of vertical spacing pieces between the inner and outer insulating cylinders and the disk winding to form inner and outer vertical cooling paths that communicate with the horizontal cooling path; 1 in the plurality of horizontal cooling passages.
In the induction electric disk winding Ls, the inner and outer vertical cooling passages are provided with blocking plugs alternately on the inner and outer sides around the entire circumference of the disk winding, insulating the cooling area. The width of the vertical cooling passage on the inlet side of the oil is set to be 1 to 311III times larger than the width of the vertical cooling passage on the outlet side of the insulating oil, and the width of the vertical cooling passage on the outlet side is set to 3 to 6 m, so that there is no need to increase the size. By equalizing the oil flow velocity of each horizontal cooling path in each cooling zone, it is possible to obtain an induction electric disc winding that can perform effective and uniform cooling.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the width of the vertical cooling path and the flow rate flowing therethrough, and Fig. 3 is a sectional view showing another embodiment of the invention. 4 is a plan view showing a general induction electric disk winding, and FIG. 5 is a sectional view taken along the line I-JIK in FIG. 4 showing a conventional induction electric disk winding. DESCRIPTION OF SYMBOLS 1... Inner insulating tube, 2... Outer insulating tube, 3... Disc winding, 4... Horizontal spacing piece, 5a... Horizontal cooling path,
6, 7... Vertical spacing piece, 8... Inner vertical cooling path, 9
...Outer vertical cooling path, 10...Inner blocking plug, 11.
・・Outside blockage plug, 13・・Outlet side vertical cooling path, 14・
...Vertical cooling path on the inlet side.

Claims (1)

[Claims] A plurality of stages of disc windings are arranged between the inner and outer insulating cylinders, and a plurality of horizontal spacers are interposed between each disc winding to form a plurality of horizontal cooling paths, and the inner and outer insulating cylinders A plurality of vertical spacing pieces are interposed between the disc winding and the inner and outer vertical cooling passages communicating with the horizontal cooling passage, and the plurality of horizontal cooling passages constitute one cooling area. inside along the entire circumference of the disc winding, with an outside vertical cooling path inside;
In the induction electric disk winding in which blocking plugs are provided alternately on the outside, the width of the vertical cooling passage on the insulating oil inlet side of the cooling zone is made 1 to 3 mm larger than the width of the vertical cooling passage on the outlet side of the insulating oil, and A disk winding for an induction electric device, characterized in that the width of the vertical cooling path on the exit side is 3 to 6 mm.