JPS61219120A - Winding for stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To improve the cooling effect of a winding by repeating to provide an oil plug to alternately change the flow of a cooling fluid in a unit of 7-12 horizontal oil routes provided between each winding, vertical oil routes being provided between inner and outer insulation cylinders and the end of each winding. CONSTITUTION:Between an inner insulation cylinder 2 and an outer insulation cylinder 3 provided inside and outside of the outer circumference of an iron core 1, windings 4 formed by winding plural number of strand conductors are placed sequentially in the direction of the axis of the iron core 1. Vertical oil routes 5, 6 are formed between the inner and the outer insulation cylinders 2, 3 and the windings 4 and a horizontal oil route 7 is formed between each two windings 4 for the flow of a cooling fluid. Oil plugs 9, 10 are provided for the flow of the cooling fluid in the horizontal oil route 7. The oil plug 9 is provided by choking the vertical oil route 6 between the outer insulation cylinder 3 and the windings 4, the cooling fluid passes through 7-12 horizontal oil routes (especially, 10 oil routes are most preferable) between the upper side or the lower side of the windings 4 and the oil plug 10 is provided by choking the vertical oil route 5 between the inner insulation cylinder 2 and the windings 4.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to stationary induction electrical windings, and more particularly to an improved narrow channel structure that improves the cooling effect of the windings.

[Technical background of the invention and its problems]

A conventional stationary induction electrical device such as a transformer 6 or an axle, for example, a narrow channel structure within a transformer winding is configured as shown in FIG. That is, a disk-shaped winding 4 formed by winding a plurality of wire conductors between inner and outer insulating cylinders 2 and 30 provided on the inner and outer sides of the outer periphery of the iron core 1 is wound in the axial direction of the iron core 1. Vertical oil passages 5 and 6 are formed in the axial direction between the inner and outer insulating cylinders 2 and 3 and the winding 4, respectively, and a horizontal oil passage 7 is formed between each winding 4. However, the structure is such that an insulating cooling medium, such as a cooling fluid such as insulating oil, is passed through these narrow passages.

However, in the conventional narrow channel structure constructed in this way, the cooling fluid such as insulating oil is heated by the heat generated by the windings and flows under the influence of buoyancy, which is a natural convection cooling method. Although the flow rate is large in 5 and 6, the flow velocity in the horizontal oil pipe 7 has no fixed direction as shown by arrow 8 and flows freely, and the flow may stop in some cases, and the flow rate is also small. Since the heat generated from the winding 4 cannot be efficiently absorbed by the cooling medium, there is a risk that the winding may be locally overheated and cause an accident such as disconnection or short circuit.

For this reason, as shown in Fig. 3, thin frames 9 and 10 are installed alternately inside the horizontal oil pipe 7 from the inner or outer insulating cylinder 2.3 for each group of horizontal oil pipes 7. oil road 7
The cooling medium is introduced into and discharged from the windings 4 to promote heat exchange between the windings 4 and the cooling medium. As shown, the flow rate distribution in the horizontal oil pipe 7 still causes stagnation or reverse flow as shown by the arrow 8, and there is no reversal effect as described in FIG. 2. On the other hand, if the number of horizontal oil pipes 7 is reduced and narrow frames 9 and 10 are arranged in Fig. 3, the flow rate in the horizontal oil pipes 7 will increase, but the resistance will also increase due to the increase in the number of narrow frames 9 and 10. The overall flow rate is reduced and the winding temperature becomes slightly overheated.

For this reason, passive measures have been taken to suppress the heat generation from the windings by reducing the input to the windings, etc. There were b problems to be solved.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to efficiently introduce the flow of a vertical oil pipe into a horizontal oil pipe, and to create an optimal horizontal oil pipe for installing an oil tap. By increasing the number of windings, the cooling effect of the winding is improved, and a safe and large-capacity static induction electric winding can be provided.

[Summary of the invention]

In order to achieve this object, according to the present invention, a disk-shaped winding formed by winding a wire conductor is sequentially parallel to the axial direction of the winding between an inner insulating cylinder and an outer insulating cylinder. Place it in
A horizontal oil passage for passing a cooling medium is formed between each of the windings, and a vertical oil passage for passing a cooling medium is formed between the inner and outer insulating cylinders and the ends of the windings. By arranging the narrow frame to efficiently introduce windings, the cooling effect of the windings is improved and the capacity is increased safely and safely.

[Embodiments of the invention]

As for the number of horizontal oil pipes between one pitch of oil taps, the optimum number of horizontal oil pipes is 7 to 12, as a result of measuring the flow velocity (l amount) distribution in the horizontal oil pipe and the winding temperature rise distribution through a winding model experiment. If the width of the winding is W1 and the height of the horizontal oilway is H, then W
/H was found to be effective in the range of 10 to 70.

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.

Among stationary induction electric appliances such as transformers or reactors, for example, a transformer winding has a plurality of elements between an inner insulating tube 2 and an outer insulating tube 3 provided on the inside and outside of the outer periphery of the iron core 1. Windings 4 formed by winding wire conductors are arranged in sequence in the axial direction of the iron core 1, and vertical oil passages 5, 6 are provided in the axial direction between the inner and outer insulating cylinders 2, 3 and the windings 4, respectively. At the same time, a horizontal oil passage 7 is formed between each winding 4 to allow an insulating cooling medium such as insulating oil, SF, gas, or the like to pass therethrough.

In order to introduce this cooling fluid into the horizontal oil pipe 7, a narrow frame 9,
Install 10. The narrow frames 9 and 10 are made of electrical insulators, and the narrow frame 9 is installed to block the vertical oil passage 6 between the outer insulating cylinder 3 and the winding 4, and is installed horizontally on the upper or lower side of the winding 4. The number of oil pipes is 7 to 12 (Special ICl 0 is the best) and then narrow frame 1
0 by blocking the vertical oil pipe 5 between the inner insulating cylinder 2 and the winding 4, or by inserting the thin frame 9 into the horizontal oil pipe 7 from the outer insulating cylinder 3 as shown in FIG. , the horizontal oil is provided up to the end surface of the winding 4 on the side of the inner insulating cylinder 2, and the horizontal oil is connected to the upper or lower side of the narrow frame 9 through 7 to 12 lines, and the horizontal oil is connected to the narrow frame 10 from the inner insulating cylinder 2. It may be inserted into the horizontal oil passage 7 at the final grain of the passage 7 and installed up to the end surface of the winding 4 on the outer insulating cylinder 3 side.

Here, the number of horizontal oil pipes between the narrow frames 9 and 10 is a case where a fractional number is required to be arranged uniformly, and when the number is small, it is preferable to install them at the top, and when the number is large, they are preferably installed at the bottom.

In the velocity distribution (arrow 8) in the horizontal oil passage 7 shown in FIG. 1, the difference in the distribution increases as it goes to the top, so the smaller the number of oil passages in the upper part, the more uniform the distribution.

Next, the effects of the present invention will be explained.

The insulating oil, which is a cooling fluid, rises in temperature due to heat generation from the windings 4, receives a light buoyant force, and rises from the bottom to the top in the figure and circulates.

At this time, by repeatedly arranging the thin frames 9 and 10 as shown in FIG. When measured, it will look like arrow 8.

ζ Here, the length of the arrow 8 indicates the magnitude of the flow velocity (the flow rate is also the same). Narrow frames 9 and 10 are arranged to form a strong vertical oil passage 6,
The insulating oil passing through the narrow frames 9 and 10 has the highest flow velocity in the horizontal oil pipe 7 closest to the narrow frames 9 and 10, and the flow velocity gradually decreases toward the top, and the direction is reversed between the next narrow frame arrangements. Then, a similar flow velocity distribution is presented, and this flow is repeated.

If the flow velocity in the horizontal oil pipe 7 is high, heat exchange with the winding 4 is promoted, so the winding is efficiently cooled, and since the winding 4 does not become extremely hot locally, a highly reliable motor can be achieved. Cold windings can be provided.

However, if the arrangement of the narrow frames 9 and 10 is not appropriate,
If there are a large number of horizontal oil pipes 7 that flow between the narrow frames 9 and 10, the flow velocity distribution of the insulating oil in the horizontal oil pipes 7 will be greatly disturbed, as shown by the arrow 8 in Figures 2 and 3. When the flow stagnates, the winding becomes overheated (6D), which shortens the life of the winding (or in some cases causes serious accidents such as melting due to heat and shortening the winding). It also becomes.

Narrow frame 9 for one-way feed. If the number of horizontal oil pipes 70 between lO is reduced, the flow velocity in the horizontal oil pipe 7 will increase and it will be effective, but the resistance due to the zigzag bend will also be large), and the flow rate will decrease as a whole. As a result, the temperature of the 9 windings is high as a whole, and it has been found through experiments that the cooling effect is not good.

Also, if the horizontal oilway height is H1 and the winding width is W, then W/H=
If it is between 1o and 70, the flow velocity distribution red stamp 8 of the horizontal oil pipe 7 as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, vertical oil passages are provided between the inner and outer insulating cylinders and the ends of each winding, and horizontal oil passages are provided between each winding, and the number of horizontal oil passages is set in units of 7 to 12. By repeatedly arranging narrow frames to alternately change the direction of the cooling fluid flowing in the horizontal oil canal, a relatively uniform flow velocity distribution can be obtained in the horizontal oil canal, which improves the cooling effect of the windings. Accordingly, it is possible to provide a high-static induction electric winding having a large capacity and high reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main part of the narrow channel structure of the transformer winding of the present invention;
FIGS. 2 and 3 are cross-sectional views of main parts of the conventional transformer winding oil passage structure. 1... Iron core 2... Inner insulation cylinder 3...
・Outer insulation cylinder 4...Winding 5.6...Vertical oil pipe 7...Horizontal oil pipe 8...Flow velocity of horizontal oil pipe
9,10...Narrow frame W...Width of winding H...
・Horizontal Oil Road Height Agent Patent Attorney Kensuke Chika (
1 other person) Figure 2~/(Figure 3 →

Claims (3)

[Claims] (1) A disk-shaped winding formed by winding a wire conductor is arranged between the inner insulating cylinder and the outer insulating cylinder, and the windings are arranged in parallel in the axial direction, and the winding and the A vertical oil path is formed between the inner and outer insulating cylinders, a horizontal oil path is formed between the windings in the vertical direction, and an oil plug is installed in each oil path to guide the cooling medium. , in a stationary induction electric appliance winding in which the cooling medium flows by natural convection, the cooling medium is introduced into the vertical oil passage between the winding and the inner or outer insulating cylinder, with the number n of the horizontal oil passages as a unit; A stationary induction electric appliance winding characterized in that the oil plugs are arranged so that the oil plugs are passed through alternately, the number n is in the range of 7 to 12, and the number is uniform. (2) The stationary induction electric appliance according to claim 1, wherein W/H is 10 to 70, 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 winding configuration is divided into n horizontal oil channels due to the arrangement of oil plugs and the winding configuration is not an integral multiple and a fraction appears,
When the fraction is ≧(1/2×n), the oil plug is placed at the top of the winding configuration, and when the fraction is <(1/2×n), the oil plug is placed at the bottom. The stationary induction electric appliance winding according to claim 1, characterized in that the number of windings between the windings is (n+1/2n).