JPH0357602B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to windings of stationary induction devices such as transformers and reactors, and more specifically, the present invention relates to windings of stationary induction devices such as transformers and reactors, and more specifically, the present invention relates to windings of stationary induction devices such as transformers and reactors. The present invention relates to a stationary induction machine winding having cooling guides for varying the flow of cooling medium between coil blocks configured to flow.

[Conventional technology]

FIG. 8 is a sectional view of a main part of a conventional static induction winding, for example, a transformer winding.
are stacked in multiple stages with insulating spacers (not shown) interposed therebetween. With this insulating spacer, the coil disc 3
An inter-disc duct 4 through which insulating oil as a cooling medium flows is formed between the coil discs 3 and an insulating spacer (not shown) extending in the axial direction.
Also formed on the outer circumferential side are an inner circumferential duct 5 and an outer circumferential duct 6, which extend in the axial direction and serve as passages for insulating oil. First and second cooling guides 7 and 8 that change the flow of insulating oil in the inter-disk duct 4 are provided in one of the plurality of inter-disk ducts 4. ing.

The first and second cooling guides 7 and 8 are shown in FIG.
As shown in Figure 0, it is annular and has different inner and outer diameters. The first cooling guide 7 with an inner diameter dimension of A and a width dimension of C is an inner insulating cylinder 1.
A second cooling guide 8 having an inner diameter of B and a width of D is attached to the outer insulating cylinder 2.

In the conventional static induction device winding configured as described above, the coil block 11 defined by the first cooling guide 7 and the second cooling guide 8 is connected from the inlet 9 of the inner duct 5. The insulating oil that has flowed into the interdisc duct 4 flows in parallel in the radially outward direction.
Subsequently, this insulating oil flows into the adjacent coil block 11 from the inlet portion 10 of the outer duct 6, and
The current flows in parallel in the radially inward direction within the inter-disc duct 4. In this way, the flow direction of the insulating oil differs in each coil block 11, and the insulating oil forms a zigzag flow. The flow velocity of the insulating oil in each inter-disc duct 4 is large in the lower part of the coil block 11 and small in the upper part of the coil block 11, as shown in FIG. 11, due to flow resistance.

[Problem that the invention seeks to solve]

The conventional stationary induction device winding is constructed as described above, and the flow velocity of the insulating oil flowing into the upper inter-disc duct 4 in the coil block 11 is low.
As shown in FIG. 12, the cooling efficiency of the insulating oil of the coil disk 3 in the vicinity is poor, resulting in the problem of localized overheating.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a stationary induction device winding that can suppress the occurrence of local overheating phenomena.

[Means for solving problems]

The stationary induction device winding according to the present invention includes cooling guides in the shape of a broken ring that are divided in the circumferential direction and are adjacent to each other with steps in the circumferential direction.

[Effect]

In this invention, the direction of parallel flow of the cooling medium flowing into each inter-disc duct changes at the cooling guide having a broken annular shape, and the flow velocity of the cooling medium flowing into each inter-disc duct is averaged.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, FIG. 1 is a sectional view taken along the line - in FIG. 3, and FIG. 2 is a sectional view taken along the line - in FIG. 3. In this cross-sectional view, the same or corresponding parts as in FIG. 8 are given the same reference numerals, and their explanation will be omitted. Insulating spacers 12a, 12b, 12 are provided between the coil discs 3.
c... are arranged at equal intervals in the circumferential direction. In the area narrowed between the insulating spacer 12a and the insulating spacer 12b, a fan-shaped first cooling guide 13 having an inner diameter of A and a width of C shown in FIG. A fan-shaped second cooling guide 14 having an inner diameter of B and a width of D as shown in FIG. 5 is attached to each of the outer insulating tubes 2 as shown in FIG. 1. In the space between the adjacent insulating spacers 12b and 12c, the first cooling guide 13 and the second cooling guide 14 are arranged as shown in FIG. 1, as shown in FIG. It is attached between the coil disks 3 with a step. The first cooling guide 13 and the second cooling guide 14 are alternately and repeatedly provided between predetermined coil disks 3 over the entire circumference for each insulating spacer 12a, 12b, .

In the static induction device winding configured as described above, even within the inter-disk duct 4 on the same plane, the first cooling guide 13 and the second cooling guide 13 and Another insulating spacer 1 is located in the middle with the cooling guide 14.
Since the area between the two cooling guides is located near the first cooling guide 13 or the second cooling guide 14, the flow velocity of the insulating oil differs even within the inter-disc duct 4 on the same plane. Figure 6 shows − in Figure 3.
The figure shows the flow velocity of the insulating oil in each inter-disc duct 4 at each cross section along the line and - line, and the average flow velocity of the insulating oil therebetween. From this figure, it can be seen that the flow velocity of the insulating oil between each inter-disk duct 4 in the height direction of the coil disk 3 is averaged.
Further, from this, as shown in FIG. 7, the temperature rise of the coil disk 3 over the entire height direction of the coil disk 3 is averaged, and local overheating of the coil disk 3 is suppressed.

In the above embodiments, two types of fan-shaped cooling guides 13 and 14 are used as cooling guides, but three or more types of cooling guides may be provided alternately in the circumferential direction between the coil disks 3. good.
Further, the shape of the cooling guide is not limited to a fan shape, but may be any shape as long as it is a broken ring.

〔Effect of the invention〕

As described above, according to the present invention, since the cooling guides in the form of annular rings adjacent to each other in the circumferential direction are provided in the inter-disc duct between the annular coil discs with a difference in level from each other, each circular The flow velocity of the cooling medium flowing in the interplate ducts is averaged, so that local overheating of the coil discs is prevented.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, FIG. 3 is a plan view of the main part, and FIG.
2 is a sectional view taken along the - line in FIG. 3, FIG. 4 is a plan view of the first cooling guide, and FIG. 5 is a plan view of the second cooling guide. Plan view, Figure 6 is a coolant flow velocity distribution diagram in the winding,
FIG. 7 is a temperature distribution diagram within the winding. Figures 8 to 12 show an example of a conventional transformer, with Figure 8 being a sectional view of the main parts, Figure 9 being a plan view of the first cooling guide, and Figure 10 being a plan view of the second cooling guide. Figure, 1st
FIG. 1 is a coolant flow velocity distribution diagram within the winding, and FIG. 12 is a temperature distribution diagram within the winding. 3...Coil disc, 4...Duct between discs, 11
...Coil block, 13...First cooling guide, 14...Second cooling guide. In addition, in each figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A stationary induction system in which coil blocks, in which a cooling medium flows in parallel through each inter-disk duct formed between annular coil disks, are stacked in multiple stages via cooling guides that change the flow of the cooling medium. A stationary induction device winding, characterized in that the device winding is provided with the cooling guide in the shape of a broken ring that is divided in the circumferential direction and adjacent to each other with steps in the circumferential direction.