JPH088173B2 - Induction electric disk winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to an induction electric disk winding, which cools with a refrigerant such as SF ₆ gas or transformer oil, and particularly to uniform cooling. The invention relates to an induction electric disk winding.

(Prior Art) Conventionally, a disk winding used as a winding of an induction electric device such as a transformer is configured as shown in the radial sectional view of FIG. 4 and the sectional view taken along the line VV of FIG. . That is, between the inner insulating cylinder 1 and the outer insulating cylinder 2, a disk winding 3 in which a wire conductor is wound.
Are stacked in multiple stages at intervals in the axial direction, and the respective disk windings are electrically connected in series by a crossover wire (not shown).

Further, the disk windings 3 are partitioned from each other by insulating spacing pieces 4 radially arranged at equal intervals in the radial direction. As a result, a horizontal cooling path 5 of the disk winding 3 that is radially sandwiched between adjacent insulating spacing pieces 4 and is formed between the disk windings 3 in the axial direction is formed. Further, between the inner / outer insulating cylinders 1 and 2 and each of the disk windings 3, an inner vertical spacing piece 6 and an outer vertical spacing piece 7 are provided on the same diameter as the insulating spacing piece 4, respectively.
The insulating space piece 4 and the inner insulating cylinder 1 and the outer insulating cylinder 2 are closely attached to each other and installed so as to extend in the axial direction and partition adjacent horizontal cooling passages 5 in the axial direction. Then, between the adjacent inner and outer vertical spacing pieces 6 and 7, that is, between the disk winding 3 and the inner and outer insulating cylinders 1 and 2, each extends in the axial direction and communicates with a plurality of horizontal cooling passages 5. A plurality of inner vertical cooling channels 8 and outer vertical cooling channels 9 are formed.

This disk winding is stored together with an insulating gas such as SF ₆ gas or an insulating refrigerant such as transformer insulating oil in a tank (not shown). Vertical cooling channels 8 and 9 and horizontal cooling channels 5
It is circulated inside to cool the disk winding 3.

Such a disk winding has a higher cooling effect,
As shown in FIG. 5, an inner plug 10 and an outer plug 10 are provided in the inner vertical cooling passage 8 and the outer vertical cooling passage 9 along the entire circumference of the disc winding 3 for every several stages of the disc winding 3. 11 are provided alternately in the axial direction, and the inner and outer vertical cooling channels 8 and 9 are alternately closed in the axial direction. As a result, one cooling zone is formed between the inner blocking plug 10 and the outer blocking plug 11 which are adjacent to each other, with respect to several stages of the disk winding 3 accommodated therein.

Therefore, in the axial direction of the induction electric disk winding, the refrigerant moves in the horizontal cooling path 5 in a zigzag manner in each cooling region because the inflow port and the outflow port are switched inside and outside for each cooling zone. That is, the refrigerant surely proceeds not only in the inner / outer vertical cooling passages 8 and 9 but also in the horizontal cooling passage 5, so that the entire induction-electric disk winding is efficiently cooled.

(Problems to be Solved by the Invention) However, in such an induction electric disk winding, looking at the flow of the refrigerant diverted to each horizontal cooling passage 5 in one cooling area, as shown in FIG. , The flow velocity is not uniform in the horizontal cooling passage 5 of each stage, and in the case of SF ₆ gas refrigerant, the flow velocity in the lower horizontal cooling passage 5 near the inlet of one cooling area is It is very small as compared with the flow velocity in the horizontal cooling passage 5 at the upper part in the vicinity. The horizontal length of the arrow 12 indicating the refrigerant path represents the magnitude of the flow velocity.

That is, each horizontal cooling path 5 in one cooling area
The distribution of the flow velocity of A becomes smaller as it approaches the inlet of one cooling zone, and particularly in the vicinity of the inlet where the flow velocity of the inner / outer vertical cooling channels 8 and 9 is fast, stagnant or backflow may occur.

This is because there is almost no difference in the flow velocity of the refrigerant between the upper horizontal cooling passage and the lower horizontal cooling passage, but the widths of the inner and outer vertical cooling passages 8 and 9 are the same. If it is narrower than that of the horizontal cooling passage, the flow resistance of the inner / outer vertical cooling passages 8 and 9 increases in one cooling area, and the flow velocity of the refrigerant in the upper and lower portions of the inner / outer vertical cooling passages 8 and 9 increases. There is a big difference (slow at the top and fast at the bottom). Therefore, in the vicinity of the inlet having a high flow velocity, the coolant is sucked in reverse from the nearby horizontal cooling passage 5, and the flow velocity of the coolant flowing upward is canceled or made negative.

Therefore, the disc winding 3 arranged near the inlet is not sufficiently cooled as compared with the disc winding 3 arranged near the outlet. Therefore, the inner and outer obstruction plugs 10,1
Despite the fact that the cooling medium is surely passed through the horizontal cooling passage 5 by mounting 1, the uniform cooling effect of each disk winding 3 cannot be obtained in each cooling zone. Therefore, the temperature of the disk winding cannot be made uniform, and an excessive temperature rise partially occurs in each cooling area, which deteriorates the insulating spacing piece 4 etc. related to the insulation of the disk winding 3 to transform the disk winding 3. The life of the vessel may be shortened.

Therefore, a winding cooling design based on the minimum flow velocity in the horizontal cooling passage 5 of the refrigerant is conceivable, such as increasing the cross-sectional area of the wire conductor forming the disk winding 3 to reduce the current density.
There are drawbacks such as making the transformer large and increasing the cost.

The present invention has been made in consideration of the above circumstances,
Induction that can secure the flow velocity necessary for cooling each horizontal cooling passage for the refrigerant passing through the cooling area without increasing the size of the induction electric machine, and can perform cooling without causing an excessive temperature rise partially An object is to provide an electric disk winding.

[Structure of Invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a disk winding arranged in a plurality of stages in an axial direction between an inner insulating cylinder and an outer insulating cylinder, and a disk winding. A plurality of insulating spacing pieces that extend in the axial direction while partitioning each disk winding in the radial direction, and that form a plurality of horizontal cooling paths for the disk windings that extend in the radial direction between adjacent insulating spacing pieces. And a plurality of inner vertical spacing pieces which are interposed while extending in the axial direction between the inner insulating cylinder and the disc winding on the same diameter as the insulation spacing pieces, which are adjacent to each other. An inner vertical spacing piece forming an inner vertical cooling passage communicating with the horizontal cooling passage between the inner vertical spacing pieces, and an axis between the outer insulating cylinder and the disc winding on the same diameter as the insulating spacing piece. A plurality of outer vertical spacing pieces that are interposed while extending in a direction, and are between adjacent outer vertical spacing pieces. An outer vertical spacing piece that forms an outer vertical cooling path communicating with the horizontal cooling path, and an inner vertical cooling path in the axial direction over the entire circumference of the disk winding in the inner vertical cooling path and the outer vertical cooling path. Inner obstruction plugs and outer obstruction plugs, which are alternately arranged in the outer vertical cooling passages, wherein the plurality of horizontal cooling passages form one cooling area between adjacent inner obstruction stoppers and outer obstruction stoppers. In an induction-electric disk winding having a plug and an outer plug, the width S _H of the horizontal cooling passages, the number n of horizontal cooling passages in one cooling zone, and the width S of the inner / outer vertical cooling passages. An induction electric disk winding is provided in which the relationship of S _V ≧ (S _H × n) / 3 is established during _v .

(Operation) In the induction electric disk winding according to the present invention, the height S _{H of} the horizontal cooling passages, the number n of horizontal cooling passages constituting one cooling area and the width S _V of the inner / outer vertical cooling passages are set. , S _V ≧ (S _H ×
The relationship of n) / 3 is satisfied. In other words, the width of the inner / outer vertical cooling channels is maintained at 1/3 or more of the width of all the horizontal cooling channels in one cooling area, so the flow resistance of the inner / outer vertical cooling channels is higher than that of the horizontal cooling channels. Decrease in one cooling area inside
The difference in the flow velocity of the refrigerant between the upper part and the lower part of the outer vertical cooling passage is reduced. Therefore, the flow velocity distribution of the refrigerant flowing into the horizontal cooling passage branched from the inner / outer vertical cooling passages is made uniform.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Since the basic configuration of the induction-electric disc winding according to this embodiment is substantially the same as that shown in FIGS. 4 and 5, corresponding parts are designated by the same reference numerals. Is omitted.

FIG. 1 is an axial sectional view of an induction electric disk winding of the present embodiment, which corresponds to FIG.

Here, as shown in the figure, the horizontal cooling path 5 in each cooling zone
Is n, the height of the horizontal cooling passage 5 is S _H , and the width of the inner and outer vertical cooling passages 8 and 9 is S _V , in this embodiment, S _V ≧ (S _H × n) / 3 ...... Set each value S _V , S _H , n so that the relationship of (1) is established.

In the induction electric disk winding of the present embodiment configured in this way
When an insulating cooling medium such as SF ₆ gas flows, keep the width S _V of the inner and outer vertical cooling channels at 1/3 or more of the width (S _H × n) of all horizontal cooling channels in one cooling zone. Because of the sagging, the flow resistance of the inner / outer vertical cooling channels 8 and 9 decreases compared to the horizontal cooling channel,
In addition to the small difference in the flow velocity of the refrigerant between the upper horizontal cooling passage and the lower horizontal cooling passage, the difference in the flow velocity of the refrigerant between the upper and lower portions of the inner / outer vertical cooling passages in one cooling zone is also reduced.
Therefore, the flow velocity distribution of the refrigerant in each horizontal cooling passage branched from the inner / outer vertical cooling passages is made uniform.

2 (A) and (B) show S _V = 1.3 × (S _H ×
n) / 3 (ie S _V ≧ (S _H × n) / 3) and S _V = 0.7 × (S _H
In the case of × n) / 3 (that is, S _V <(S _H × n) / 3), the flow velocity distribution of the refrigerant in each horizontal cooling passage of one cooling area is shown.

FIG. 2 (A) shows the flow velocity distribution of the refrigerant in this embodiment, but in the induction electric disk winding of this embodiment, the flow velocity distribution in each horizontal cooling passage in one cooling area is made uniform. On the other hand, when the formula (1) of the present invention is not established between S _V , S _H , and n, the flow velocity becomes zero near the lower part of one cooling zone, and the upper and lower parts of the horizontal cooling channel There is a large difference in the flow velocity.

Figure 3 is a graph showing the relationship between the _{(S H × n) / S} V and a disc winding the maximum temperature, there is an inflection point in the vicinity of _{S H × n / S V =} 3. Therefore, (S _H × n) / S _V ≦ 3, that is, S _V ≧
In the region of (S _H × n) / 3, the maximum temperature of the disk winding is low because a relatively uniform flow velocity distribution as shown in FIG. 2 (A) is obtained. On the other hand, (S _H × n) / S _V > 3, that is, S _V
In the region of <(S _H × n) / 3, since the flow velocity distribution has a horizontal cooling passage with a flow velocity of 0 as shown in FIG. 2 (B), it is considered that the maximum temperature of the disk winding increases. Note that S _V = (S _H
× n) / 3 is a limit condition that neither stagnant flow nor backflow occurs.

According to the present embodiment, since the respective values S _V , S _H , n are set so that the equation (1) is satisfied, the refrigerant flow velocity at each stage of the horizontal cooling passage is made uniform, and It is possible to improve the cooling efficiency by eliminating the problem that the temperature rise of the plate winding partially becomes excessive. Therefore, it is possible to increase the current density by reducing the cross-sectional area of the wire conductors forming the disk winding, and it is possible to reduce the size and weight of the induction-electric disk winding.

〔The invention's effect〕

As described above, according to the induction electric disk winding of the present invention, it is possible to uniformly cool the entire disk winding, and it is possible to reduce the size of the induction electric disk winding and improve the economical efficiency. You can

[Brief description of drawings]

FIG. 1 is an axial sectional view of an essential part of an induction electric disk winding according to an embodiment of the present invention, and FIG. 2 (A) is a horizontal section in one cooling area of the induction electric disk winding according to the present embodiment. FIG. 2 (B) is a graph showing the flow velocity distribution of the cooling passage, FIG. 2 (B) is a graph showing the flow velocity distribution of each horizontal cooling passage in one cooling area of the induction-electric disk winding, which does not satisfy the requirements of the present invention. figure (S _H × n) / graph showing the relationship between the value of S _V and disc windings maximum temperature, Figure 4 is a radial direction sectional view of a conventional induction apparatus disc winding, Fig. 5 Fourth
It is the VV sectional view taken on the line of FIG. 1 ... Inner insulation cylinder, 2 ... Outer insulation cylinder, 3 ... Disc winding, 4 ...
Insulation spacing piece, 6 ... Inner vertical spacing piece, 7 ... Outer vertical spacing piece, 5 ... Horizontal cooling passage, 8 ... Inner vertical cooling passage, 9 ... Outer vertical cooling passage, 10 ... Inner plug, 11 ... Outer plug.

Claims (1)

[Claims] 1. A disk winding arranged in a plurality of stages in the axial direction between an inner insulating cylinder and an outer insulating cylinder, and extending in the axial direction while partitioning each disk winding in the radial direction of the disk winding. A plurality of insulating spacing pieces, the insulating spacing pieces forming a plurality of horizontal cooling paths of disk windings extending in the radial direction between adjacent insulating spacing pieces; A plurality of inner vertical spacing pieces interposed axially extending between the inner insulating cylinder and the disc winding, wherein the inner vertical spacings are connected between the adjacent inner vertical spacing pieces. An inner vertical spacing piece that forms a cooling passage, and a plurality of outer vertical spacing pieces that are interposed on the same diameter as the insulating spacing piece while extending in the axial direction between the outer insulating cylinder and the disk winding. An outer vertical cooling passage communicating with the horizontal cooling passage between adjacent outer vertical spacing pieces. Vertical spacing pieces, and inner closures and outers alternately arranged in the inner vertical cooling passage and the outer vertical cooling passage in the axial direction over the entire circumference of the disk winding in the inner vertical cooling passage and the outer vertical cooling passage, respectively. A plurality of horizontal cooling passages between adjacent inner and outer obstruction plugs.
In an induction-electric disc winding comprising inner and outer closures forming two cooling zones, the width of the horizontal cooling path
Between S _H , the number n of horizontal cooling channels in one cooling zone, and the width S _v of the inner / outer vertical cooling channels, S _V ≧ (S _H × n) / 3
Induction electric disk winding that has established the relationship of.