JPS60227407A - Winding of stationary induction apparatus - Google Patents

Abstract

PURPOSE:To make uniform the flow rate of a cooling medium passing through a winding block and thereby to prevent the deterioraton of an insulating member by a construction wherein an outlet enabling the outflow of the cooling medium outside an outer insulating tube is provided in a portion of the side wall of the outer insulating tube which faces the uppermost winding block. CONSTITUTION:Disk windings 3a-3d, which are unit windings, are superposed in layers in the axial direction between an inner insulating tube 1 and an outer insulaing tube 2, so as to constitute a winding block 4, and a guide plate, such as a plate denoted by 5c, for instance, is provided between the side walls of the insulating tubes 1 and 2, so as to section the block 4. Moreoer, horizontal ducts 6a-6e are provided between the adjacent ones of the disk windings 3a-3d respectively, while vertical ducts 7 and 8 are formed between the insulating tube 1 and the windings 3a-3d and between these windings and the insulating tube 2. In this construction, an outlet 14 through which an insulating oil, that is, a cooling medium, flows out of the tube 2 is provided in a portion of the side wall of the tube 2 which faces the uppermost winding block 4, and the insulating oil flowing into the block 4 through a passing hole 10 is made to flow in parallel through the ducts 6a-6e and discharged from the outlet 14 directly outside the tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] - The present invention relates to windings of stationary induction equipment such as transformers and reactors, and particularly relates to improving the cooling efficiency thereof.

[Prior art]

FIG. 1 is a cross-sectional view of a main part of a conventional static induction device winding, for example, a transformer winding. Lines 3a, 3b,
3c and 36 are stacked in the axial direction to form a winding blocker.

This winding blocker is a guide board! They are stacked in multiple stages via ja, kb, and kc.

A vertical duct 7 is formed between the horizontal insulating tubes and the disk windings 3a, Jb, 3c, and 3d, respectively. Information board ja,
jb and jc are provided alternately on the respective side walls of the inner insulating cylinder l and the outer insulating cylinder. And that information board
, jb, jC on the outer insulating tube λ side and the inner insulating tube/side,
A passage hole through which insulating oil as a cooling medium passes? , 10. /
J is formed respectively. In addition, /l
is a cylindrical winding, /2 is a cylindrical winding // and a disc winding Ja,
This is a holding plate that holds down Jb, Jc, and Jd from above.

Next, the cooling effect of the insulating oil on the transformer winding having the above configuration will be explained. The insulating oil flows from the passage hole D as shown by arrow A in Fig. 1, and flows into each horizontal duct) Aa, 4b, 6c,
4d, AelC1'Ej also flow in parallel in the axial direction of the outer insulating cylinder. This insulating oil merges near the passage hole 10, and flows from the passage hole 10 again to the winding block μ located at the top stage.
It will flow inside. In the uppermost winding block Hironai, the insulating oil is transferred again to the horizontal ducts Aa, 6b, Ac,
It flows parallel to the winding block in the previous stage along lines Ad and 4e in the opposite direction, and flows out of the outer insulating cylinder through the passage hole 13.

And the disc winding? a, ,? b1. ? c.
? The heat generated by d is caused by insulating oil in each horizontal duct Aa, 4b, 6c.
, Ad.

6θ and vertical duct)? , f to be removed when passing through K.

As a conventional stationary induction equipment winding, for example in the case of a transformer winding, each horizontal duct) Aa Ab, 4c.

As can be seen from Figure 2, the flow rate (v) of the insulating oil flowing through /-d and be is largest at the horizontal turf (4e) located at the innermost part of the winding block, and is near the passage holes 9 and 10K. It can be seen that the horizontal duct) 4a and Ab are smaller.

As a result, the disc windings Ja , 3b, 3c , ? The temperature (T) of d is low where the flow rate of the insulating oil is large, and high where the flow rate is low. The temperature of the disc winding 3d is low, and the temperature of the disc winding 3a near its entrance is high, causing the disc windings 3a, Jb in the winding block Hironai to
, 3c, and 3d are not uniform in temperature. Particularly in this case, the trap is that insulating oil heated in the lower winding block flows into the uppermost winding block, so the temperature of the uppermost winding block is lower than that of the other winding blocks. Due to the local temperature increase within the winding block, which is higher than that of the winding block, the disc windings 3a, 3b.

This had the disadvantage of deteriorating the insulating members of Jc and 3d and shortening the life of the transformer itself.

[Summary of the invention]

This invention was made for the purpose of eliminating the above-mentioned drawbacks, and the side wall K of the outer insulating cylinder facing the uppermost winding block has an outflow hole that allows the cooling medium to flow out of the outer insulating cylinder. Due to the simple configuration of forming the winding, the flow rate of the cooling medium passing through the winding block becomes uniform, and the winding units are also cooled uniformly, which prevents thermal deterioration of the insulating members of the winding units. It provides:

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a stationary induction device winding according to the present invention will be described below with reference to the drawings. FIG. 3 is a sectional view showing an embodiment of the present invention, and the same or corresponding parts as in FIG. 1 are designated by the same reference numerals, and the explanation thereof will be omitted. An outflow hole 1 is formed in the side wall of the outer insulating cylinder λ facing the uppermost winding block, through which insulating oil as a cooling medium can flow out of the outer insulating cylinder.

Insulating oil that has flowed into the winding block through the passage hole /θ in each horizontal duct Aa
, Ab, Ac, Ad, and Ae can flow in parallel and directly flow out of the outer insulating cylinder λ from the outflow hole /4' as shown by arrow B. The amount of insulating oil passing through the vertical duct is
It is only the insulation hydraulic pressure that passed through some horizontal ducts 6. Therefore, the fluid resistance in the vertical duct)f is small compared to the conventional case where the insulating oil joins the vertical duct)f between the disk windings Ja, 3b, 3c, 3a and the outer insulating tube. As shown in FIG. 7, the flow rate (V) distribution of the insulating oil in the uppermost winding block 9 becomes uniform, and the disk winding, ? a, J
The temperature (T) distribution among b, Jc, and Jd is also made uniform.

In this way, by equalizing the temperature among the disk windings 3a, jb, 3c, 3a in the highest winding block 9, which has the highest temperature, some of the disk windings 3a, 3b, 3c,
It is possible to prevent overheating of 3 tl and suppress thermal deterioration of the insulating member.

In addition, in the case of the above embodiment, since the flow rate of the insulating oil passing through the horizontal duct 6 and merging near the passage hole 3 is small, the fluid resistance of the insulating oil flowing between the cylindrical turns ml/3 is reduced, and the cylindrical turns 1
Increase the flow rate of insulating oil flowing between w77, cylindrical winding /
/ is also efficiently cooled.

In addition, when the transformer windings are arranged in parallel as shown in FIG.
By providing the outer insulating tube λ so as not to face the outer insulating tube λ, the outer insulating tube λ acts as an insulation barrier between adjacent transformer windings, so that the gap between the transformer windings can be reduced.

Further, as shown in FIG. 6, disk windings 3a and 3b.

,? Even if the outflow holes 17 are formed in each of the outer insulating cylinders/6 of the transformer winding in which C and 3d are arranged in the inner and outer layers in the radial direction, the same effect as in the above embodiment can be obtained.

Furthermore, although insulating oil was used as the cooling medium in the above embodiment, for example, non-condensable gas air, 8F.

It may also be gas or the like.

Also, disk winding as a winding unit? a...? b...? c.
.

3d is used, but the present invention is not limited thereto, and may be a winding having a cooling medium passage in the radial direction, such as a helical winding.

Furthermore, in the above embodiments, the static induction device winding is a transformer winding, but the present invention is not limited to this, and may be a reactor, an induced voltage adjuster, etc., for example.

〔Effect of the invention〕

As explained above, the stationary induction device winding of the present invention has a simple structure in which an outflow hole is formed in the side wall of the outer insulating cylinder facing the uppermost winding block to allow the cooling medium to flow out. As a result, the flow rate of the cooling medium passing through the uppermost winding block is made uniform, the winding units are also uniformly cooled, and thermal deterioration of the insulating members of the winding units can be prevented.

[Brief explanation of drawings]

FIG. 7 is a cross-sectional view of a conventional transformer winding, FIG. 2 is a diagram showing the flow rate distribution of the cooling medium passing through the horizontal duct of FIG. 1 and the temperature distribution of each winding, and FIG. A cross-sectional view showing one embodiment; Fig. 3 is a diagram showing the flow rate distribution of the cooling medium passing through the horizontal duct of Fig. 3 and the temperature distribution of each winding;
FIG. S is a partly omitted plan view when the transformer windings of the present invention are used in parallel arrangement, and FIG. 6 is a sectional view showing another embodiment of the present invention. /・・Inner insulation tube, K, /A・・Outer insulation tube, 3a, J
b, Jc,...? d-- Disk winding (winding unit) d-- Winding block, S... Guide plate, /'7, /k. /7...Outflow hole. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 3: Figure 5

Claims (1)

[Claims] (1) A winding block consisting of stacked winding units is stacked in multiple stages with a guide plate interposed between the inner insulating cylinder and the outer insulating cylinder so that the cooling medium flows in parallel between the winding units. In the stationary induction equipment winding, the guide plate is configured to apply an opposite pressure to the flow direction of the cooling medium flowing in the adjacent winding blocks, an outer insulating cylinder facing the uppermost winding block. A stationary induction equipment winding characterized in that a side wall of the winding is formed with an outflow hole that allows the cooling medium to flow out of the outer insulating cylinder. (g) The stationary induction device winding according to claim 7, wherein the outflow hole is formed at a position that does not face the outer insulating cylinder of the adjacent stationary induction device winding.