JPS61219119A - Winding for stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To improve the cooling effect of a winding by providing an oil plug which can alternately change the flow of a refrigerant in a unit of 5-8 horizontal oil routes among each winding, vertical oil routes being provided among inner and outer insulation cylinders, the windings and the windings divided into two groups. CONSTITUTION:Vertical oil routes 5, 7 are formed among inner and outer insulation cylinders 2, 3 and windings 4 respectively, vertical oil route 6 is provided in the middle of divided two groups of the windings 4 and a horizontal oil route 8 is provided between the upper and lower windings for the flow of a refrigerant fluid. Oil plugs 10, 11, 12 are provided for the effective flow of the refrigerant in the horizontal oil route 8. The oil plugs 10, 11, 12 use an electrical insulator. The oil plugs 11, 12 are provided in the vertical oil routes between the windings 4 and between the windings 4 and the outer insulation cylinder 3, from this position, the refrigerant passes through the horizontal oil routes of uniform number of 5-8 and the oil plugs 10, 11 are provided between the inner insulation cylinder 2 and the windings 4 and between the windings 4 respectively. this construction is repeated and the windings are constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to stationary induction electric appliance windings, and more particularly to improving the cooling effect of the windings and improving the nine-oil structure.

[Technical background of the invention and its problems]

A conventional stationary induction electric device such as a transformer or an axle, for example, an oil conduit structure within a transformer winding, is constructed as shown in FIG. That is, a disc-shaped winding 4 formed by winding a plurality of wire conductors between inner and outer insulating tubes 2.3 provided on the inner and outer sides of the outer circumference of the iron core 1 is wound in the axial direction of the iron core 1. The inner and outer insulating cylinders 2 and 3 and the winding 4
and forming vertical oil passages 5, 6, and 7 between the
Horizontal oil passages 8 are formed between each winding 4, and a highly insulating cooling medium such as insulating oil (hereinafter referred to as refrigerant) is passed through these oil passages.

However, in the case of the conventional oil pipe structure configured as shown below, the cooling method is a natural convection method in which the refrigerant is heated by the heat generated by the windings and flows with buoyancy (= is the vertical oil pipe 5, 6.7, the flow rate is large, but the flow rate in the horizontal oil pipe 8, that is, the flow velocity, is as shown by the arrow 9 (there are parts where the flow stops because the two directions are not fixed and it just flows by itself, and When the amount of heat generated from the windings increases, not only does the flow stop, but the refrigerant flows little by little while creating a piston motion, which prevents heat exchange between the windings and the refrigerant, causing local overheating of the windings. Otherwise, accidents such as wire breakage or short circuit may occur.

For this purpose, as shown in Figure 1 (2), the two horizontal oil pipes 8 are installed between the inner insulating cylinder 2 and the winding 4, or between the outer insulating cylinder 3 and the winding 4, respectively. 10° 11.12 is placed in the horizontal oil pipe 8 (two refrigerants are introduced,
If the number of horizontal oil passages between oil paintings is large, backflow and stagnation phenomena occur as shown by arrow 9 in FIG. 3.

In addition, if the number of horizontal oil pipes between the oil oaks in Figure 1 is too small, the flow velocity in the horizontal oil pipe will increase, but the overall flow resistance will increase and the overall flow rate will decrease. The temperature of the winding increases.

For this reason, passive methods have been taken to suppress the heat generation from the windings by reducing the input to the windings, and there are problems that need to be solved by creating more efficient self-cooling transformers or increasing the size of the transformers. there were.

[Purpose of the invention]

The present invention was developed in consideration of the above points, and its purpose is to install a winding with a large winding width (2) to install an oil painting in order to efficiently introduce the flow of a vertical oil pipe into a horizontal oil pipe. The purpose of the present invention is to provide a safe and large-capacity stationary induction electric appliance winding by improving the cooling effect of the winding by providing the optimum number of horizontal oil passages for the winding.

[Summary of the invention]

In order to achieve this object, according to the present invention C, a large disc-shaped winding formed by winding a wire conductor in an inner insulating cylinder and an outer insulating cylinder is divided into two parts. The windings are arranged parallel to each other in the axial direction, and horizontal oil passages are formed between each of the windings to allow the refrigerant to pass through.The oil-painting arrangement allows the refrigerant to be efficiently introduced into the horizontal oil passages, thereby achieving a cooling effect on the windings. It is characterized by improved safety and large capacity.

[Embodiments of the invention]

The following description will be made with reference to FIG. 1, which shows an embodiment of the static induction electric winding of the present invention, and the same parts are denoted by the same symbols.

For example, in a stationary induction electric appliance such as a transformer or an accelerator, a transformer winding includes a plurality of strands of wire between an inner insulating tube 2 and an outer insulating tube 3 provided on the inner and outer sides of the outer circumference of the iron core 1. Windings 4 formed by winding a conductor are sequentially arranged in the axial direction of the iron core 1, and vertical oil passages 5, 7 are formed between the inner and outer insulating cylinders 2, 3 and the windings 4, respectively. winding 4 to 2
It is divided and a vertical oil passage 6 is provided in the middle, and between the upper and lower parts of the winding (the second part forms a horizontal oil passage 8), an insulating cooling medium such as insulating oil or SF is used.
.

It has a structure that allows cooling fluid such as gas to pass through it.

In order to efficiently introduce this refrigerant into the horizontal oil pipe 8, oil plugs 10, 11, and 12 are installed. Oil painting 10, 11゜12
uses electrical insulators, and oil paintings 11 and 12 use winding 4 and winding 4.
and between the winding 4 and the outer insulating cylinder 3, and the number of horizontal oil pipes from this position to the upper side or the lower side is within 5 to 8 and uniform in diameter. Oil painting 10.11
The windings are constructed by repeating the arrangement of vertical oil passages between the inner insulating cylinder 2 and the windings 4 and between the windings 4 and 4 respectively.

The number of horizontal oil passages between the upper and lower oil paintings shall be uniform in the winding configuration, but if the upper end of the winding configuration occurs, and the number of oil passages from 5 to 8 is set as n, K”
If the fraction is smaller than %xn, it is added between the oil paintings at the bottom, and when the fraction is larger than %xn, it is added between the oil paintings at the top.Next, the effects of the present invention will be explained.

The insulating oil, which is a refrigerant, is slightly buoyant due to the heat generated from the winding 4 (the temperature rises), and it rises from the bottom to the top in FIG. 1 and circulates.

At this time, by using the thin frame arrangement shown in the embodiment of FIG.

Here, the length of the arrow 9 indicates the magnitude of the flow velocity (the flow rate is also the same).

The flow velocity distribution in the horizontal narrow paths in the upper and lower oil painting cabinets is fastest in the windings near the entrance 13 of the vertical narrow path 5 at the bottom, and becomes gentler towards the top, but in the windings near the exit 14 of the vertical narrow path 7 The flow velocity distribution is almost the same in the upper and lower regions. In the next arrangement between oil paintings, there is a completely similar flow velocity distribution with the opposite direction, and this flow is repeated repeatedly.

If the flow velocity of the refrigerant in the horizontal narrow path 8 is fast, heat exchange with the winding 4 is promoted in proportion to the flow velocity, so the winding is efficiently cooled, and no winding becomes extremely high in temperature, which improves efficiency. Can provide good self-cooling winding.

However, if the number of horizontal narrow paths 8 between the upper and lower oil paintings is reduced to 15, then there will be parts where the refrigerant flows backward or stagnates, and the winding 4 will be locally overheated, making it impossible to increase the capacity. Otherwise, this local overheating can cause serious accidents such as melting and short circuits.

On the other hand, if the number of horizontal narrow paths 8 between the upper and lower oil paintings is reduced, the flow velocity of the refrigerant will increase, but the resistance of the entire winding structure will increase, so the flow rate will decrease, and the winding temperature will become high as a whole for cooling. The effect is still not good. Also, it is not economical to produce as it requires a lot of oil painting.

Comparing the flow velocity distribution between oil paintings in the upper and lower parts of the winding configuration, the flow velocity distribution between the oil plugs in the upper part is higher than that in the lower part because the flow velocity ratio in the oil painting pavilion is larger, so the horizontal narrow path 8 is found in the winding configuration. If the number of divisions of the number n is not an integral multiple, install horizontal narrow paths larger than the number n in the lower part where the flow velocity ratio is gentle, or install horizontal narrow roads smaller than the number n in the upper part where the flow velocity ratio is large. Similar effects can be obtained with the overall flow rate and flow velocity distribution.

If the horizontal narrow path height is H1 and the winding width is W, &4=5~40
2), the flow velocity distribution arrow 9 shown in FIG.

Next, another example will be shown.

In Fig. 2, oil 310, 12 is connected to inner insulating cylinder 2 and winding 4
The oil painting 11 may be installed between the outer insulating cylinder 3 and the winding 4, and the oil painting 11 may be installed between the windings 4 and the winding 4, and the arrangement may be repeated alternately. The flow velocity distribution within 8 is as shown by arrow 9, and the winding can be cooled with high efficiency in the same way as above.

〔Effect of the invention〕

As described above, according to the present invention (2), vertical narrow paths are provided between the inner and outer insulating cylinders, the windings, and the two divided windings, and horizontal narrow paths are provided between each winding, so that the number of horizontal narrow paths is 5 to 8. As a unit, the narrow frame arrangement is used to alternately change the direction of the flow of refrigerant flowing in the horizontal oil pipe.Secondly, the flow velocity distribution in the horizontal oil pipe is relatively uniform, so the cooling effect of the windings is improved. Therefore, it is possible to provide a safe, large-capacity, and highly reliable stationary induction electric winding.

[Brief explanation of the drawing]

1 and 2 are sectional views of main parts of a narrow passage structure of a transformer winding according to the second invention, and FIG. 3 is a sectional view of main parts of a narrow passage structure of a conventional transformer winding. 1... Iron core 2... Inner insulation cylinder 3...
Outer insulating cylinder 4... Winding 5.6.7... Vertical narrow path 8... Horizontal narrow path 9... Flow velocity distribution of horizontal narrow path
10, 11, 12... Oil painting 13... Entrance of vertical narrow path 14... Exit of vertical narrow path H... Height of horizontal narrow path W... Winding width Agent Patent attorney Nori Chika Ken, right (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) Two sets of disc-shaped windings formed by winding a wire conductor between an inner insulating cylinder and an outer insulating cylinder are arranged in parallel, and further the windings are arranged in parallel in the axial direction, and the above-mentioned A vertical oil path is formed between the winding and the inner and outer insulating cylinders and between the windings, and a horizontal oil path is formed between the windings in the vertical direction, An oil plug for guiding a cooling medium is installed in each of the oil pipes, and in a stationary induction electric winding in which the cooling medium flows by natural convection, the number of horizontal oil pipes, n, is installed inside or outside the winding. A stationary induction electric appliance winding, characterized in that the oil plugs are arranged so that the cooling medium alternately passes through the vertical oil path between the insulating cylinder, and the number n is 5 to 8. (2) The stationary induction electric appliance according to claim 1, wherein W/H is 5 to 40, where W is the width of the winding in the horizontal direction and H is the height of the horizontal oil pipe. winding. (3) If the number of horizontal oil passages (n) divided by the arrangement of oil plugs in the winding configuration is not an integral multiple of the uniform number of oil passages (5 to 8), and a fraction occurs, (1/2 x n ) When the number of fractions is ≥ (1/2 x n), the winding configuration is placed at the top of the winding configuration, and when the number of fractions is < (1/2 x n), the winding configuration at the bottom is placed at the top of the winding configuration (n+1). /2n) stationary induction electric appliance winding according to claim 1.