JPH06267756A - Winding of induction apparatus - Google Patents

Abstract

PURPOSE:To make effective cooling possible by increasing flow rate of a horizontal cooling path in a lower part wherein insulation fluid is hardest to flow in each cooling region. CONSTITUTION:In the induction apparatus winding, an inside blocking board 10a ranging an inside vertical cooling path 8 and a horizontal vertical cooling path 5 and an outside blocking board 11a ranging the horizontal cooling path 5 and an outside vertical cooling path 9 are provided alternately to each of a plurality of steps of a disc windings 3 to constitute one cooling region of a plurality of horizontal cooling paths 5, and insulation fluid is made to flow in zigzag. A blocking piece 13 is provided near an outside of the horizontal cooling path 5 wherein the inside blocking board 10 is installed and near an inside of the horizontal cooling path 5 wherein the outside blocking board 11a is installed to block one of the horizontal cooling paths 5, an a clearance is provided between the inside and outside blocking boards 10a, 11a and the blocking piece 13 to make insulation fluid flow well. Thereby, it is possible to reduce dispersion of flow rate distribution of each horizontal cooling path, to make possible effective cooling and to reduce size and weight of an electric apparatus body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a gas cooling type or liquid cooling type induction electric winding.

[0002]

2. Description of the Related Art In a conventional induction winding, for example, a disk winding of a transformer, a wire conductor is wound between an inner insulating cylinder 1 and an outer insulating cylinder 2 as shown in FIG. A plurality of disc windings 3 are stacked in the axial direction.

Between each of the disk windings 3, a plurality of horizontal spacing pieces 4 are radially arranged at equal intervals, and horizontal cooling passages 5 are formed in the radial direction of the disk windings 3. Outer insulation tube 1
And 2 and the disk winding 3 are each provided with a vertical spacing piece 6
And 7 are arranged on the inner and outer circumferences of the disk winding 3 corresponding to the horizontal spacing piece 4 to form an inner vertical cooling passage 8 and an outer vertical cooling passage 9, respectively. As shown in FIG. 4, in this winding, an inner vertical cooling path 8 and a horizontal cooling path 5 are provided for each plurality of stages of the disk winding 3 so that one cooling area is constituted by the plurality of horizontal cooling paths. An inner closing plate 10 and an outer closing plate 11 extending over the horizontal cooling path 5 and the outer vertical cooling path 9 are alternately provided over the entire circumference, and the inner insulating cylinder 1 and the disk winding 3 are provided.
And the vertical cooling paths 8 and 9 between the outer insulating cylinder 2 and the disk winding 3 are alternately closed so that the insulating fluid flows from the inner side to the outer side or vice versa.

Therefore, for example, an insulating fluid such as SF6 gas, insulating oil, perfluorocarbon and the like is inverted in the inlet and the outlet in each of the cooling areas, and flows in a zigzag shape between the disk windings 3. , The winding is being cooled.

[0005]

However, in the transformer winding having the above structure, the inner blocking plate 10 and the outer blocking plate are provided.
The flow of the insulating fluid diverted to each horizontal cooling passage 5 in a certain cooling area formed by 11 and 11 is not uniform, and the flow velocity in the lower horizontal cooling passage 5 which is generally near the inlet is near the outlet. The flow velocity in the upper horizontal cooling passage 5 is extremely small compared to the flow velocity in the upper horizontal cooling passage 5. That is, the flow velocity distribution 12 in each horizontal cooling passage 5 in this cooling area is in the state shown by the broken line arrow.

Therefore, there is a problem that the disk winding 3 arranged near the inlet is not sufficiently cooled as compared with the disk winding 3 arranged near the outlet. Therefore, even if the inner and outer blocking plates 10 and 11 are attached and the insulating fluid is passed through the winding in a zigzag manner, the expected uniform cooling effect of each disk winding 3 cannot be obtained. It is impossible to make the temperature rise of the winding uniform, and an excessive temperature rise occurs partially in each cooling area, which deteriorates the winding insulation.
The problem arises that the life of the transformer is shortened.

As measures against such a problem, the cross-sectional area of the wire conductor forming the disk winding 3 is increased to reduce the current density, and the minimum flow velocity of the insulating fluid in the horizontal cooling passage 5 is used as a reference. It is conceivable to design the windings as described above, but in either case, there is a drawback that the transformer is made large.

The present invention eliminates the above-mentioned drawbacks of the prior art,
It is an object of the present invention to obtain an induction electric winding capable of effectively cooling by increasing the flow velocity of the horizontal cooling path in which the insulating fluid is most difficult to flow in each cooling zone.

[0009]

In order to achieve the above object, the present invention has an inner vertical cooling for each of a plurality of stages of a disk winding so that a plurality of horizontal cooling paths constitutes one cooling area. By alternately providing an inner closing plate extending over the passage and the horizontal cooling passage, and an outer closing plate extending over the horizontal cooling passage and the outer vertical cooling passage,
In the induction coil winding that causes the insulating fluid to flow in a zigzag manner, install blocking pieces near the outside of the horizontal cooling passage with the inner closing plate and near the inside of the horizontal cooling passage with the outer closing plate. One of them is closed, and a gap is provided between the inner and outer closing plates and the closing piece so that the insulating fluid sufficiently flows.

As a result, the insulating fluid flowing through the horizontal cooling passage above the cooling zone having a high flow velocity is guided as it is to the horizontal cooling passage below the cooling zone having a low flow velocity, and an excessive temperature rise is partially suppressed. , It is possible to reduce the variation in the flow velocity distribution of each horizontal cooling path and perform effective cooling.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding portions. In a transformer winding including a disc winding, a plurality of stages of disc winding 3 formed by winding a wire conductor between an inner insulating cylinder 1 and an outer insulating cylinder 2 are stacked in the axial direction. Has been done. A plurality of horizontal spacing pieces are radially arranged at equal intervals between each of the disc windings 3 to form a horizontal cooling path 5 in the radial direction of the disc winding 3, and further the inner and outer insulating cylinders 1 and 2 are formed. And the disk winding 3 are arranged on the inner and outer circumferences of the disk winding 3 corresponding to the horizontal spacing pieces, and the inner vertical cooling path 8
And the outer vertical cooling channels 9 are formed. In the horizontal cooling path 5, the inner vertical cooling path 8 and the outer vertical cooling path 9 thus configured, one of the plurality of horizontal cooling paths is provided.
An inner closing plate extending over the inner vertical cooling path 8 and the horizontal cooling path 5 for each of the plurality of disk windings 3 so as to form one cooling area.
10a, and outer closing plates 11a extending over the horizontal cooling passages 5 and the outer vertical cooling passages 9 are alternately provided over the entire circumference. The vertical cooling passages 8 and 9 are alternately closed.

At this time, the inner closing plate 10a and the outer closing plate
The length of 11a in the horizontal direction is shortened so as to cover the inner vertical cooling passage 8 and the horizontal cooling passage 5 halfway, and the outer vertical cooling passage and the horizontal cooling passage 5 halfway, respectively. Further, a blocking piece 13 is installed near the outside of the horizontal cooling path 5 in which the inner blocking plate 10a is installed and near the inside of the horizontal cooling path 5 in which the outer blocking plate 11a is installed to close one of the horizontal cooling paths. .

When the insulating fluid is circulated through the transformer winding having the cooling passages thus constructed, the fluid flowing through the upper horizontal cooling passage, which is most likely to flow in each cooling zone, is directly located on the insulating fluid. In the cooling area, the horizontal cooling path at the bottom, which is the most difficult to flow, is reversed. For this reason, the flow velocity distribution 12a in each horizontal cooling passage in each cooling area can flow the insulating fluid at a considerable flow velocity also in the lower horizontal cooling passage in each cooling area, as indicated by a dashed arrow. Therefore, it is possible to suppress the temperature rise in the lower disk winding in each cooling zone where the temperature is expected to be the most severe.

As a result, it is possible to increase the flow velocity of the horizontal cooling path below each cooling zone where the flow velocity is small in the conventional winding structure, and to suppress the temperature rise of the disc winding, which is the most severe in terms of temperature, to be small. Cooling is possible. Therefore, increase the minimum value of the flow velocity of each horizontal cooling path,
It is possible to eliminate the inconvenience that the temperature rise of the winding is partially excessive. This makes it possible to reduce the cross-sectional area of the wire conductor and increase the current density, and it is possible to obtain a transformer having an excellent cooling effect and a small and lightweight transformer.

By the way, it is possible to integrate the inner and outer closing plates and the closing piece. For example, as shown in FIG. 2, the closing pieces 13a are arranged on the outer peripheral side of the inner closing plate 10b and the inner peripheral side of the outer closing plate 11b, and one or a plurality of holes 14 are provided in the vicinity thereof so that the insulating fluid can flow sufficiently. Even with an open structure, the fluid that has flowed through the upper horizontal cooling passage that is most likely to flow in each cooling area should be reversed to the lower horizontal cooling passage that is the most difficult to flow in the cooling area above it. Therefore, a similar effect is expected.

[0016]

As described above, according to the present invention, the flow velocity of the lower horizontal cooling passage in which the insulating fluid does not flow most is increased in each cooling zone, so that the induction machine can be cooled effectively. The winding is obtained, and as a result, the size and weight of the electric device body can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a plan view showing a conventional induction winding.

FIG. 4 is a cross-sectional view taken along the line II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner insulating cylinder 2 ... Outer insulating cylinder 3 ... Disc winding 4 ... Horizontal spacing piece 5 ... Horizontal cooling passage 6 ... Inner vertical spacing piece 7 ... Outer vertical spacing piece 8 ... Inner vertical cooling passage 9 ... Outer vertical cooling passage 10, 10a, 10b ... Inner closing plate 11, 11a, 11b ... Outer closing plate 12, 12a ... Velocity distribution 13, 13a ... Closing piece 14 ... Hole

Claims (2)

[Claims] 1. A plurality of disc windings are arranged between the inner and outer insulating cylinders, and a plurality of horizontal cooling passages are radially formed by interposing a plurality of horizontal spacing pieces between each of the disc windings. Then, a plurality of vertical spacing pieces are interposed between the inner / outer insulating cylinder and the disk winding to communicate the horizontal cooling passages to form a plurality of inner / outer vertical cooling passages. 1 in the cooling path
An inner closing plate extending over the inner vertical cooling passage and the horizontal cooling passage, and an outer closing plate extending over the horizontal cooling passage and the outer vertical cooling passage are alternately arranged over the entire circumference for each of the plurality of stages of the disk winding so as to form one cooling zone. Provided, in the induction electric winding that makes the insulating fluid flow in a zigzag manner, install blocking pieces near the outside of the horizontal cooling path where the inner blocking plate is installed and near the inside of the horizontal cooling path where the outer blocking plate is installed. An inductor winding, wherein one of the horizontal coolers is closed, and a gap is provided between the inner and outer closing plates and the closing piece so that a sufficient insulating fluid flows. 2. A plurality of disc windings are arranged between the inner and outer insulating cylinders and a plurality of horizontal cooling passages are radially formed by interposing a plurality of horizontal spacing pieces between each of the disc windings. Then, a plurality of vertical spacing pieces are interposed between the inner / outer insulating cylinder and the disk winding to communicate the horizontal cooling passages to form a plurality of inner / outer vertical cooling passages. 1 in the cooling path
An inner closing plate extending over the inner vertical cooling passage and the horizontal cooling passage, and an outer closing plate extending over the horizontal cooling passage and the outer vertical cooling passage are alternately arranged over the entire circumference for each of the plurality of stages of the disk winding so as to form one cooling zone. Provided, in the induction electric winding for flowing the insulating fluid in a zigzag manner, the inner and outer closing plates have the same thickness as the horizontal spacing piece on the outer peripheral side of the inner closing plate and the inner peripheral side of the outer closing plate. An induction winding, which has the same effect as that of a blocking piece, and is provided with one or more holes in the vicinity thereof to allow sufficient insulating fluid to flow.