JPH0831656A - Winding wire of transformer - Google Patents

Abstract

PURPOSE:To provide a transformer winding wire which is restrained from being locally overheated and enhanced in cooling efficiency by a method wherein a pressure control member such as a corrugated board or the like is provided to an inlet-side vertical duct to enhance cooling medium in pressure loss so as to control it in flow rate toward a horizontal duct. CONSTITUTION:A coil 1 is arranged in an axial direction through the intermediary of horizontal ducts 2 (a to e), an inlet-side vertical duct 4 is formed between the coil 1 and an insulating cylinder 3, an outlet-side vertical duct 6 is formed between the coil 1 and an insulating cylinder 5, a deflecting plate 7 is disposed above the inlet-side vertical duct 4, a deflecting plate 8 is disposed below the outlet-side vertical duct 6, and a corrugated board 9 of insulating material such as FRP or press board is arranged between the coil 1 and the insulating cylinder 3. Cooling medium is enhanced in pressure loss by the corrugated board 9 provided to the inlet-side vertical duct 4 in a deflection zone, whereby it is restrained from drifting and controlled in flow rate to the horizontal duct 2, and the coil 1 is prevented from being locally overheated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding of a transformer,
In particular, the present invention relates to a cooling structure of a disk winding (disk coil) and a helical winding by a split-flow section method.

[0002]

2. Description of the Related Art There are many conventional winding methods for the windings of a transformer. Among them, a disk winding is a unit disk coil in which a conductor is wound in a radial direction. Pieces) are stacked in the axial direction. The helical winding is a spiral winding of a plurality of conductors stacked in the radial direction. In either case, a duct piece is sandwiched between coils (between turns in the case of a helical coil) to form a horizontal duct, and insulating cylinders are arranged on the inner and outer circumferences of the winding (coil). Axial spacers are circumferentially arranged between them at appropriate intervals to form a vertical duct that serves as a passage for the refrigerant.

In the above winding of the transformer, most of the refrigerant flowing from the lower part of the winding passes through the vertical duct and a small amount of refrigerant flows into the horizontal duct. Therefore, a structure called a split-flow system has been adopted. The split-flow zone method is a method of increasing the cooling effect of the winding by arranging the split-flow plates alternately at the predetermined positions in the vertical duct to change the flow of the cooling medium to the side of the horizontal duct and flowing it in zigzag. So, this method has been adopted.

FIG. 6 is a vertical cross-sectional view showing a main part of a conventional winding winding type transformer winding. In FIG. 6, a coil 21 is axially arranged via a horizontal duct 22 (a to e). Placed,
An inlet side vertical duct 24 is provided between the coil 21 and the insulating cylinder 23.
However, an outlet side vertical duct 26 is formed between the insulating cylinder 25 and the insulating cylinder 25. A flow diverter plate 27 is arranged above the inlet side vertical duct 24, and a flow fold plate 28 is arranged below the outlet side vertical duct 26 to change the flow direction of the refrigerant.

Refrigerant flows into the refrigerant inlet 29 from the outlet of the outlet side vertical duct of the flow break section in the preceding stage (not shown), and the inlet 2
9 flows into the vertical duct 24 on the inlet side of the current flow section, and branches into a to e of each horizontal duct 22. The split refrigerants merge in the outlet-side vertical duct 26, and pass through a flow path in which the refrigerant outlet 30 of the outlet-side vertical duct 26 of the current flow section flows into the inlet-side vertical duct of the next flow-flow section.

FIG. 7 shows each horizontal duct 2 of the transformer winding of FIG.
2 is a flow rate curve diagram of the refrigerant flow rate at the positions a to e, the horizontal duct 22e near the refrigerant outlet 30 of the outlet side vertical duct 26 of the mixed flow section has a flow rate of each horizontal duct as shown in FIG. At the maximum, the other horizontal ducts 22a to 22d are extremely small.

[0007]

In such a conventional structure, bending loss occurs at the portion where the refrigerant changes the flow from the inlet side vertical duct 24 to the horizontal duct 22. Therefore, most of the refrigerant goes straight through a to c of the inlet side vertical duct 24, and the flow rate is concentrated in the horizontal duct 22e near the outlet of the outlet side vertical duct 26 (see FIG. 7). A drift occurs in which the refrigerant hardly flows in the horizontal duct 22a near 29. Due to this uneven flow of the refrigerant, there is a high possibility that local overheating will occur in the coil located at a place where the refrigerant flow rate is extremely low.

The present invention has been made in view of the above points, and a pressure adjusting member such as a corrugated corrugated board or a pipe is installed in a vertical duct on the inlet side of a flow break section to increase pressure loss. An object of the present invention is to provide a transformer in which the refrigerant flow rate to the horizontal duct is adjusted to suppress the occurrence of local overheating of the winding and to improve the cooling efficiency.

[0009]

Means for Solving the Problems In the present invention, a means for solving the above-mentioned problems is to provide a coil of a vertical duct on the inlet side of a diversion section in a transformer winding having a cooling structure of a diversion section type. A pressure adjusting member made of an insulating material is provided between the insulating cylinders to increase the pressure loss and adjust the flow rate of the refrigerant to the horizontal duct to suppress the local overheating of the winding.

It is preferable that this pressure adjusting member is constructed by a combination of one or two of a corrugated corrugated pipe, a square pipe or a round pipe.

Further, the ratio of the pressure adjusting member arranged in the inlet side vertical duct to the vertical duct cross-sectional area is gradually increased from the refrigerant inlet side to the outlet side to uniformize the flow distribution ratio of the refrigerant to the horizontal duct for cooling. Increase efficiency.

As a means for adjusting the ratio of the pressure adjusting member to the cross-sectional area of the vertical duct, a corrugated corrugator having different corrugation roughness and a pipe having different opening ratio of the pipe are used. Adjust the aperture ratio of.

[0013]

In the structure of the present invention, a pressure adjusting member such as a corrugated corrugated board or a pipe is installed in the vertical duct on the inlet side of the flow diversion section to increase pressure loss, thereby suppressing uneven flow and preventing the refrigerant from flowing into the horizontal duct. It regulates the flow rate, suppresses the occurrence of local overheating, and enhances the cooling efficiency of the transformer winding.

[0014]

Embodiments of the transformer winding of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an essential part of a first embodiment of a transformer winding of the present invention, and FIG. 2 is a lateral sectional view of an essential part taken along the line AA 'of FIG. In, the coil 1 is arranged in the axial direction via the horizontal ducts 2 (2a to 2e), the inlet side (upstream side) vertical duct 4 is provided between the coil 1 and the insulating tube 3, and the insulating tube 5 is provided. The outlet side vertical duct 6 is formed. A flow fold plate 7 is arranged above the inlet-side vertical duct 4, and a flow fold plate 8 is arranged below the outlet-side (downstream) vertical duct 6. A pressure adjusting member made of an insulating material such as a press board or FRP is provided between the coil 1 and the insulating cylinder 3.

The pressure adjusting member in this embodiment is composed of a corrugated board 9 having a wave shape (wave shape is semicircular, triangular wave, square wave, sine wave, etc.). In addition, 10 is a duct piece for forming the horizontal duct 2, 11 is a refrigerant inlet, 12 is a refrigerant outlet, and at the same time,
It will be the refrigerant inlet for the next break-up area. In FIG. 2, the cross section of the fold flow section when the inlet side vertical duct 4 is provided on the outside is shown, but the fold flow section alternates between the inlet side vertical duct 4 and the outlet side vertical duct 6 inside and outside the coil 1. Since the inlet side vertical duct 4 is inside the coil 1,
A corrugated corrugated board 9 is arranged inside the coil 1.

The refrigerant flows from the refrigerant inlet 11 into the inlet-side vertical duct 4 and splits into the horizontal ducts 2a to 2e. The separated refrigerant merges in the outlet-side vertical duct 6, and the refrigerant outlet 12
Through the flow path that flows into the vertical duct on the inlet side of the next fold section. Then, the corrugated corrugated board 9 acts as a resistance against the flow of the refrigerant in the inlet-side vertical duct 4 between the coil 1 and the insulating cylinder 3, and the refrigerant is easily split into the horizontal ducts 2a to 2e. As a result, it is possible to suppress uneven flow, adjust the flow rate of the refrigerant to the horizontal duct, suppress the occurrence of local overheating, and enhance the cooling efficiency of the transformer windings to make the device compact.

FIG. 3 is a flow rate curve diagram showing the refrigerant flow rate at the positions of the horizontal ducts 2a to 2e of the first embodiment of the transformer winding of the present invention. As shown in FIG. 3, the flow rate of each horizontal duct is , Becomes almost constant.

FIG. 4 is a cross-sectional view showing the essential parts of a second embodiment of the transformer winding of the present invention, in which an inlet side vertical duct 4 and an insulating cylinder 5 are provided between the coil 1 and the insulating cylinder 3. An outlet side vertical duct 6 is arranged in between. And the coil 1 and the insulating tube 3
Between them, a rectangular pipe 13 made of an insulating material such as a press board or FRP is arranged as a pressure adjusting member.
In addition, 10 is a duct piece. The effect is similar to that when the corrugated corrugated board of the first embodiment is used.

FIG. 5 is a cross-sectional view showing an essential part of a third embodiment of the transformer winding of the present invention. An inlet side vertical duct 4 is provided between the coil 1 and the insulating tube 3 and an insulating tube 5 is provided. An outlet side vertical duct 6 is arranged in between. And the coil 1 and the insulating tube 3
A circular pipe 14 made of an insulating material such as a press board or FRP is arranged as a pressure adjusting member.
In addition, 10 is a duct piece. The effect is similar to that when the corrugated corrugated board of the first embodiment is used.

As described above, according to the present invention, by providing the pressure adjusting member for the inlet side vertical duct of the transformer winding and adjusting the pressure loss of the inlet side vertical duct, the branching of the refrigerant to the horizontal duct is improved. Therefore, if the ratio of the pressure adjusting member arranged in the inlet side vertical duct to the vertical duct cross-sectional area is gradually increased from the refrigerant inlet side to the outlet side, the flow distribution ratio of the refrigerant to the horizontal duct is increased. Are homogenized.

As a means for adjusting the ratio of the pressure adjusting member to the cross-sectional area of the vertical duct, in the case of using a corrugated corrugate, different corrugation roughness is used to adjust the opening ratio of each vertical duct. In the case of a mold pipe or a round pipe, it can be realized by arranging pipes having different opening ratios in vertical ducts and adjusting the pipes, and further by one or a combination of two or more of them.

[0023]

As described above, according to the transformer winding of the present invention, (1) a corrugated corrugated board, a pipe, or the like is provided in the inlet-side vertical duct of the transformer winding having the cooling structure of the split-flow type. It is possible to suppress uneven flow by increasing the pressure loss by installing the pressure adjusting member of (3), improve the flow of the refrigerant to the horizontal duct, suppress uneven flow of the refrigerant, and improve the cooling efficiency.

(2) The occurrence of local overheating of the winding can be suppressed.

(3) As a result, it is possible to provide a compact transformer with few failures.

Excellent effects such as the above can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of a first embodiment of a transformer winding of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a refrigerant flow rate curve diagram at the position of the horizontal duct of the first embodiment of the transformer winding of the present invention.

FIG. 4 is a transverse cross-sectional view of the essential parts of a second embodiment of the transformer winding of the present invention.

FIG. 5 is a transverse cross-sectional view of the essential parts of a third embodiment of the transformer winding of the present invention.

FIG. 6 is a partial vertical cross-sectional view of a main part of a conventional winding winding type transformer winding.

FIG. 7 is a refrigerant flow rate curve diagram at a position of a horizontal duct of a conventional winding-flow-type transformer winding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Coil 2 (a-e) ... Horizontal duct 3, 5 ... Insulation cylinder 4 ... Entrance side vertical duct 6 ... Exit side vertical duct 7, 8 ... Folding plate 9 ... Corrugated corrugated board 10 ... Duct piece 11 ... Refrigerant inlet 12 ... Refrigerant outlet 13 ... Square pipe 14 ... Round pipe

Claims (4)

[Claims] 1. In a transformer winding having a cooling structure of a mixed flow system, a pressure adjusting member made of an insulating material is provided between the coil of the vertical duct on the inlet side of the distributed flow region and the insulating cylinder to increase the pressure loss. A transformer winding, wherein the flow rate of the refrigerant to the horizontal duct is adjusted to suppress the occurrence of local overheating of the winding. 2. The transformer winding according to claim 1, wherein the pressure adjusting member is constituted by a combination of one or two corrugated corrugated pipes or pipes (square or round). 3. The ratio of the pressure adjusting member arranged in the inlet-side vertical duct to the vertical duct cross-sectional area is gradually increased from the refrigerant inlet side to the outlet side to equalize the distribution ratio of the refrigerant to the horizontal duct. The transformer winding according to claim 1 or 2, characterized in that. 4. The vertical duct using a corrugated corrugation having different corrugation roughness and a pipe having different opening ratio of the pipe as a means for adjusting the ratio of the pressure adjusting member to the vertical duct cross-sectional area. 4. The transformer winding according to claim 3, wherein the opening of the transformer winding is adjusted.