JPH02148809A - Disc winding for induction device - Google Patents

Abstract

PURPOSE:To reduce by half a passage resistance, to obtain a flow rate sufficient to cool to effectively cool and to reduce a difference between high and low temperatures by so forming inner and outer insulating cylinders as to compose peculiar vertical oil guide passages as double cylinders, and providing a plurality of inlets communicating with the top of a cooling zone and a plurality of outlets communicating with the top of the zone in the inner or outer cylinders opposing a disc winding therein. CONSTITUTION:Inner and outer closing plugs 10a and 11a are mounted at the same height positions at both sides of one disc winding 3 except the uppermost and lowermost pats along the whole circumference of the winding 3 at each plurality of stages of the winding 3 in inner and outer vertical cooling passages 8a to completely block the cooling passages of cooling zones formed of the plugs 10a, 11a. Further, inner and outer insulating cylinders 1a, 2a are so formed in double cylinders as to compose peculiar vertical oil guide passages 12, 13, and inlets 15 communicating with the bottoms of the zones and outlets 16 communicating with the tops of the zones are provided inner or outer insulating cylinders 1b, 2b opposing the winding 3.

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 an insulating medium such as 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 FIGS. 4 and 5.

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. are electrically connected in series by crossover wires. A plurality of horizontal spacing pieces 4 are arranged radially at equal intervals between each disc winding 3, and a radial horizontal cooling path 5 is formed between each disc winding 3. Furthermore, inner and outer insulating cylinders 1 and 2 and each of the disc windings 3, vertical spacing pieces 6 and 7 are provided at positions corresponding to the horizontal spacing pieces, and the disc windings 3 and the inner and outer insulating cylinders 1 are connected to each other.
, an inner vertical cooling passage 8 and an outer vertical cooling passage 9 communicating with the horizontal cooling passage 5 are formed between the two. The insulating oil is stored in a tank (not shown) together with insulating oil, and the insulating oil is circulated through each cooling path by natural convection of the insulating oil or forced convection by a circulation pump to cool the windings.

In order to further enhance the cooling effect of this type of disc winding, the fifth
As shown in the figure, an inner plug 10 and an outer plug 11 are installed along the entire circumference of each of the plural stages of the disc winding so that one cooling zone is formed by the plural 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 flows between each disk winding 3 in a zigzag shape, with the insulating oil inlet and outlet being reversed inward and outward in each cooling zone, thereby cooling the entire winding. are being carried out efficiently.

(Problem to be Solved by the Invention) However, in the disk winding having the above structure, the insulating oil flows through the lower cooling zone and the temperature gradually rises, and then flows directly into the upper cooling zone. The temperature increases as it moves in a zigzag pattern toward the top. Therefore, even if good cooling is achieved, the oil temperature in the horizontal cooling path 5 and the temperature of the disc winding 3 rise stepwise as shown at A and B in FIG. 6, with the temperature being highest at the top. Furthermore, due to magnetic flux, the heat generation density increases at the top of the winding.
The temperature at the top becomes particularly high. Therefore, the difference in temperature between the top and bottom of the same plate winding becomes large, and by installing cut-angle inner and outer plugs 10.11, insulating oil is passed through the entire winding in a zigzag pattern. Even if cooling is attempted, the winding temperature increases at the top due to the rise in the temperature of the insulating oil in the vertical direction, which has the drawback of deteriorating the winding insulation and shortening the life of the transformer. . As a countermeasure to these 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 winding based on the maximum temperature rise of the disc winding. A cooling design may be considered, but in either case, the disadvantage is that the transformer becomes large.

The present invention eliminates the above-mentioned drawbacks, and without increasing the size,
The object of this invention is to lower the upper winding l8 degrees and obtain an induction electric disc winding that can be effectively cooled as a whole.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above objects, the present invention provides an induction electric appliance in which plugging plugs are provided along the entire circumference of the disk winding in the inner and outer vertical cooling paths. In the disc winding, the blocking plugs are provided at the same height on both the inner and outer sides except for the top and bottom, completely blocking the inner and outer vertical cooling passages of each cooling zone, and The insulating cylinders are made into double cylinders so as to form their own vertical oil guide passages, and the inner or outer insulating cylinder facing the disk winding has an inlet that passes through the lower part of each cooling zone and an inlet that passes through the upper part of the same area. Further, the vertical cooling passage and the vertical oil guide passage on the side where the inlet and the outlet of each cooling zone are provided are provided with blocking plugs along the entire circumference of the disc winding. That is.

(Function) As a result, the number of times that the insulating medium flowing from the lower part of the winding flows in a zigzag pattern through the horizontal cooling path is halved, which means the flow path resistance is halved, and a sufficient flow rate for cooling can be obtained, resulting in the effect of reducing the temperature difference. cooling.

(Example) An embodiment of the present invention will be described below with reference to FIG.

In the figure, the same parts as in FIG. 5 are indicated by the same reference numerals.

The disc winding of the present invention has an inner insulating tube 1a' and an outer insulating tube 2a.
A plurality of disc windings 3 each formed by winding a wire conductor are stacked in the axial direction, and the disc windings 3 are electrically connected to each other by crossover wires. A plurality of horizontally spaced pieces are arranged radially at equal intervals between each disc winding 3,
A horizontal cooling path 5 in the radial direction is formed between each disc winding 3, and vertical spacing pieces correspond to the horizontal spacing pieces between the inner and outer insulating cylinders 1a and 2a and the disc winding 3. An inner vertical cooling passage 8 and an outer vertical cooling passage 9, which communicate with the horizontal cooling passage 5, are formed between the disc winding 3 and the inner and outer insulating cylinders 1a and 2a, respectively.

The inner vertical cooling passage 8 and the outer vertical cooling passage 9 configured in this manner are provided with an inner blocking plug 10a and an outer blocking plug 11g along the entire circumference of the disc winding 3 for each of multiple stages of the disc winding 3. Inner and outer blocking plugs 10a are installed at the same height on both sides of one disc winding 3 except for the top and bottom.
, lla completely block the inner and outer vertical cooling passages of each cooling zone. Furthermore, the inner and outer insulating cylinders 1a and 2a are each provided with its own vertical oil guide passage 12.1.
3, the inner or outer insulating cylinders 1b, 2b facing the disc winding 3 have an inlet 15 passing through the lower part of each cooling zone and an outlet 16 passing through the upper part of the same area. will be established.

Further, plugs 14 are provided along the entire circumference of the disc winding 3 in the inner and outer vertical cooling passages 8.9 and the inner and outer vertical oil guide passages 12 and 13 on the inlet 15 and outlet 16 sides.

When an insulating fluid flows through the disc winding constructed in this way, for example, the insulating oil rises up the vertical oil channel 12.13, flows into a certain cooling area, cools the disc winding 3, and cools the disc winding 3. The oil flows out into the same vertical oil channel 12, 13, rises, and flows into another cooling zone. Here, in the embodiment shown in FIG. 1, in the cooling zone at the bottom, the insulating oil flows into the cooling zone through the vertical oil guide path and the vertical cooling path, and in the cooling zone at the top, the insulating oil flows into the cooling zone through the vertical oil guide path and the vertical cooling zone. Since it passes through the cooling path and is discharged to the top of the tank, it flows easily in these two cooling areas. This is done in consideration of the fact that the heat generation density increases at the upper and lower ends of the winding.

Furthermore, whereas conventionally the insulating oil flows several times in a zigzag pattern through the horizontal cooling path where the flow path resistance is greatest, in the embodiment shown in FIG. 1 this is halved and the total flow path resistance is reduced to 1/2.

The relationship between flow path resistance and flow speed is as follows: (flow path resistance) flash (flow speed) -1 due to friction loss, and (flow path resistance) cc (flow speed) -2 due to inlet loss and other losses. The total flow rate will increase by 1.4-2 times. If we focus on only one cooling zone, the flow rate will be reduced by 0.7 to 1 times compared to the conventional method, and the temperature difference between the insulating oil and the windings will be larger than before in the upper and lower parts of each cooling zone. Since the amount of heat transferred to one vertical oil channel is also halved, the temperature of the insulating oil flowing into each cooling zone is significantly reduced, and the winding temperature and the temperature difference between the upper and lower sides are also reduced.

Figure 2 shows the temperature distribution (A
: oil temperature, B: winding temperature).

In each cooling zone, the temperature difference between the top and bottom will be about 1.4 times larger than before, but because the low-temperature insulating oil flows into the upper cooling zone, the temperature difference between the top and bottom of the entire winding can be kept small, especially in the upper part. It can be seen that the temperature drop is large.

By the way, in a flow path with multiple horizontal cooling channels and vertical cooling channels, the natural circulation method using the buoyancy of the oil and the forced circulation method using an oil pump are based on the flow force, that is, the circulation force. different.

There is no problem with the forced circulation method as it is determined by the pump performance, but
In the case of the natural circulation method, the flow rate changes depending on the position of the winding.
The amount flowing through the lower winding is greater than the amount flowing through the upper winding. Therefore, in order to make the flow balance in the vertical direction uniform, it is necessary to arrange the plugs vertically symmetrically. In other words, as shown in FIG. 3, the insulating oil leaving the lowermost cooling area flows into the uppermost cooling area, so that the flow rate is the same in the lower and upper parts.

In addition, the flow path resistance can be reduced by enlarging the vertical cooling path instead of using a double cylinder in the section where unnecessary plugs 14 are installed.

As a result of the above, it is possible to obtain a uniform cooling effect on the entire disc winding, to keep the temperature of the upper part of the winding low, and to obtain a disc winding with a small temperature difference between the upper and lower sides. This makes it possible to increase the current density by reducing the cross-sectional area of the wire conductor, thereby improving the cooling effect and reducing the size and weight.

[Effects of the Invention] As described above, according to the present invention, in the induction electric disc winding in which the plugs are provided along the entire circumference of the disc winding in the inner and outer vertical cooling paths, the plugs are placed in the uppermost position. The inside and outside are located at the same height except for the lower part, and the inside and outside vertical cooling paths of the cooling area are completely blocked, and the inside and outside insulating tubes each form their own vertical oil guide path. A double cylinder is provided, and the inner or outer insulating cylinder facing the disc winding is provided with a plurality of inlets leading to the lower part of the cooling zone and a plurality of outlets leading to the upper part of the cooling zone, and the flow of each cooling zone is Blocking plugs are provided along the entire circumference of the disc winding in the vertical cooling path and vertical oil guide path on the side where the inlet and outlet are installed, so the flow path resistance is halved and a sufficient flow rate for cooling can be obtained. In addition, it is possible to obtain an induction electric disk winding with a small difference in temperature between the two sides, which allows for effective cooling.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
3 is a cross-sectional view showing another embodiment of the present invention, FIG. 4 is a plan view showing a general induction electric disk winding, and FIG. This figure is a sectional view taken along the line 1--1 in FIG. 4 showing a conventional induction electric disk winding, and FIG. 6 is a characteristic diagram showing the relationship between height and temperature corresponding to FIG. 5. la, lb...inner insulating tube, 2a, 2b...outer insulating tube, 3...disc winding, 4...horizontal spacing piece, 5...
・Horizontal cooling path, 6.7... Vertical spacing piece, 8... Inner vertical cooling path, 9... Outer vertical cooling path, 10.108.
...inner obstructor, 11. lla...external obstruction plug, 12
...Inlet side vertical oil guide path, 13... Outlet side vertical oil guide path, 14... Blocking plug. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 2 Figure Figure Figure

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 are connected to each other. 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. In an induction electric disc winding, in which plugging plugs are provided along the entire circumference of the disc winding in the inner and outer vertical cooling paths, the plugging plugs are provided simultaneously on the inner and outer sides except for the uppermost and lower parts, and the cooling area is The inner and outer vertical cooling passages of the cylinder are completely closed, and the inner and outer insulating cylinders are made into double cylinders so as to form their own vertical oil guide passages, and the inner side facing the disc winding is Alternatively, an induction electric disk winding characterized in that the outer insulating cylinder is provided with a plurality of inlets passing through the lower part of the cooling area and a plurality of outlets passing through the upper part of the cooling area.