JP2015050251A - Dry type stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry type transformer in which, by making flow rate of air passing through a V-phase coil equal to the flow rate passing through a U-phase coil and a W-phase coil, the V-phase coil secures cooling performance equal to that of the U-phase coil and the W-phase coil, and the V-phase coil is prevented from overheating.SOLUTION: In a dry type transformer, a V-phase air duct cross sectional area Sv of a V-phase air duct 14a between the internal wall surface of a V-phase air duct plate part 7a and the outer peripheral surface of a V-phase coil 5 is equal to a U-phase air duct cross sectional area Su of a U-phase air duct 14b between the internal wall surface of a U-phase air duct plate part 7b and the outer peripheral surface of a U-phase coil 4, and a W-phase air duct cross sectional area Sw of a W-phase air duct 14c between the internal wall surface of a W-phase air duct plate part 7c and the outer peripheral surface of a W-phase coil 6, and each flow rate of air passing through respective U-phase coil 4, V-phase coil 5 and W-phase coil 6 from an air tunnel 1 is equal.

Description

  The present invention relates to a dry static inductor in which an inductor body in which a U-phase coil, a V-phase coil, and a W-phase coil are sequentially arranged in a line is cooled by air having both functions of insulation and cooling.

Conventionally, a transformer body in which a U-phase coil, a V-phase coil, and a W-phase coil are sequentially arranged in a line;
A box-shaped wind tunnel surrounding the lower periphery of the transformer body, and a wind path plate provided around the entire circumference of the transformer body in the wind tunnel and guiding air from the wind tunnel to the transformer body. The U-phase coil, the V-phase coil and the W-phase coil each have a low voltage coil part and a high voltage coil part arranged concentrically with the low voltage coil part. A U-phase air passage plate portion surrounding the U-phase coil, a V-phase air passage plate portion surrounding the V-phase coil, and a W-phase air passage plate portion surrounding the W-phase coil are continuously connected to each other. There is known a dry-type transformer configured as described above (see, for example, Patent Documents 1 and 2).
In this dry transformer, a cooling fan attached to the side of the wind tunnel is driven, air is sucked into the wind tunnel, and the air sucked into the wind tunnel flows upward from the lower part of the transformer body. The blown air receives heat from the low voltage coil part and the high voltage coil part and is discharged to the outside as it is.

Japanese Patent Laid-Open No. 7-57940 JP 2009-76825 A

However, in this dry transformer, a U-phase coil, a V-phase coil, and a W-phase coil are sequentially arranged in a line, and the central V-phase coil is sandwiched between the U-phase coil and the W-phase coil. The air path on both sides of the phase coil side and the V phase coil side is narrow.
Accordingly, the flow rate of air passing through the V-phase coil is smaller than the flow rate passing through the U-phase coil and the W-phase coil, and the V-phase coil has cooling performance compared to the U-phase coil and the W-phase coil. It was bad and overheated.

  An object of the present invention is to solve such a problem, and by making the flow rate of air passing through the V-phase coil equal to the flow rate passing through the U-phase coil and the W-phase coil, The purpose of the coil is to obtain a dry static inductor in which the same cooling performance as that of the U-phase coil and W-phase coil is ensured and overheating of the V-phase coil is prevented.

A dry stationary inductor according to the present invention includes an inductor body in which a U-phase coil, a V-phase coil, and a W-phase coil are sequentially arranged in a line, a box-shaped wind tunnel that surrounds the lower periphery of the inductor body, A wind path plate that surrounds the entire circumference of the inductor body in the wind tunnel and guides air from the wind tunnel to the top of the inductor body, and
The U-phase coil, the V-phase coil, and the W-phase coil each have a low voltage coil portion, a high voltage coil portion that is disposed concentrically with the low voltage coil portion,
The air path plate includes a U phase air path plate portion surrounding the U phase coil, a V phase air path plate portion surrounding the V phase coil, and a W phase air path plate portion surrounding the W phase coil. Are connected in series,
The V-phase air passage cross-sectional area of the V-phase air passage between the inner wall surface of the V-phase air passage plate portion and the outer peripheral surface of the V-phase coil is the inner wall surface of the U-phase air passage plate portion and the U-phase coil. W-phase wind path breakage of the W-phase wind path between the inner wall surface of the W-phase wind path plate portion and the outer peripheral surface of the W-phase coil Equal to the area,
The flow rates of the air passing through the U-phase coil, the V-phase coil, and the W-phase coil from the wind tunnel are equal.

According to the dry static induction apparatus of the present invention, the V-phase airway cross-sectional area is equal to the U-phase airway cross-sectional area and the W-phase airway cross-sectional area, so the flow rate of the air passing through the V-phase coil is U It becomes equal to the flow volume which passes a phase coil and a W phase coil.
Therefore, the V-phase coil has the same cooling performance as the U-phase coil and W-phase coil, and the V-phase coil is prevented from overheating.

It is a top view which shows the dry type transformer by Embodiment 1 of this invention. It is a top view which shows the wind tunnel of FIG. It is arrow sectional drawing along the III-III line of FIG. It is arrow sectional drawing along the VI-IV line of FIG. It is a top view which shows the dry type transformer by Embodiment 2 of this invention. It is a top view which shows the wind tunnel of FIG. It is arrow sectional drawing along the VII-VII line of FIG. It is arrow sectional drawing along the VIII-VIII line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a plan view of a dry transformer according to Embodiment 1 of the present invention, FIG. 2 is a plan view of the wind tunnel 1 of FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1.
A dry-type static induction device, for example, a dry-type transformer installed in a basement, is a box-shaped wind tunnel 1 whose wall surface is made of an iron plate, and extends vertically in the wind tunnel 1 and supports two upper and lower portions. 2, a U-phase coil 4, a V-phase coil 5, and a W-phase coil 6 that are sequentially arranged along the longitudinal direction on the wind tunnel 1, and a U-phase coil whose lower end surface is fixed to the wind tunnel 1. 4. Corresponding to the U-phase coil 4, V-phase coil 5, and W-phase coil 6 on the side surface of the wind path plate 7 surrounding the outer periphery of the V-phase coil 5 and W-phase coil 6 and the wind tunnel 1, respectively, and facing each other And a cooling fan 13 that guides the outside air to the wind tunnel 1.

The iron core 3 includes leg portions 8 extending along central axes of the U-phase coil 4, the V-phase coil 5, and the W-phase coil 6, and a yoke portion 9 that connects the upper and lower portions of the leg portions 8, respectively. Have.
The U-phase coil 4, the V-phase coil 5 and the W-phase coil 6 are each provided with a low voltage coil portion 10 concentric with the leg portion 8, and outside the low voltage coil portion 10 and concentrically with the leg portion 8. High-voltage coil unit 11.
The dimensions of the iron core 3 are, for example, 2.5 m in height, 3 m in width, and 0.2 m in width. Each of the U-phase coil 4, V-phase coil 5, and W-phase coil 6 has an outer diameter of 0. .9m, height 1m
It is.

The air passage plate 7 is made of a material such as insulating paper.
The air passage plate 7 surrounds the entire circumference of the transformer body, which is an inductor body composed of the U-phase coil 4, the V-phase coil 5, and the W-phase coil 6.
The air passage plate 7 includes a V-phase air passage plate portion 7 a concentric with the V-phase coil 5, a U-phase air passage plate portion 7 b eccentric to the V-phase coil 5 side with respect to the central axis of the U-phase coil 4, and W A W-phase air passage plate portion 7c eccentric to the V-phase coil 5 side with respect to the center axis of the phase coil 6 is continuously connected.
As can be seen from FIGS. 3 and 4, the air passage width A between the outer peripheral surface of the high-voltage coil portion 11 of the V-phase coil 5 and the inner wall surface of the V-phase air passage plate portion 7 a is the high-voltage coil of the W-phase coil 6. It is larger than the air passage width B between the outer peripheral surface of the portion 11 and the inner wall surface of the W-phase air passage plate portion 7c.

The V-phase air passage cross-sectional area Sv of the V-phase air passage 14a between the inner wall surface of the V-phase air passage plate portion 7a and the outer peripheral surface of the V-phase coil 5 is equal to the inner wall surface of the U-phase air passage plate portion 7b and the U-phase. The U-phase air passage cross section Su of the U-phase air passage 14 b with the outer peripheral surface of the coil 4, and the W-phase air passage 14 c between the inner wall surface of the W-phase air passage plate portion 7 c and the outer peripheral surface of the W-phase coil 6. Equal to the W-phase airway cross-sectional area Sw.
Therefore, the flow rate of air passing through the U-phase coil 4, the V-phase coil 5, and the W-phase coil 6 from the wind tunnel 1 is equal.

In the dry transformer having the above-described configuration, the cooling fan 13 is driven during normal operation of the transformer, and air having both functions of insulation and cooling is sucked into the wind tunnel 1.
The air sucked into the wind tunnel 1 passes through the U-phase coil 4, the V-phase coil 5, and the W-phase coil 6 from the wind tunnel 1, and the air passes through the low-pressure coil unit 10 and the high-pressure coil unit 11. It receives heat from the heat and is released as it is.
By this air, the temperature of the low voltage coil unit 10 and the high voltage coil unit 11 is suppressed to about 100 ° C., which is the heat resistant upper limit temperature of the air passage plate 7.

In this embodiment, the center V-phase coil 5 is sandwiched between the U-phase coil 4 and the W-phase coil 6, and the air path on the U-phase coil side and the V-phase coil side of the V-phase coil 5. However, the center axis of each of the U-phase wind path plate 7b and the W-phase wind path plate 7c is V with respect to the center axes of the U-phase coil 4 and the W-phase coil 6, respectively. The V-phase air passage 14a is arranged so as to be biased toward the center axis of the phase coil 5, and the V-phase air passage cross section Sv of the V-phase air passage 14a is the U-phase air passage cross-section Su of the U-phase air passage 14b and the W-phase air passage 14c It is equal to the W-phase airway cross-sectional area Sw.
Therefore, the flow rate of the air passing through the V-phase coil 5 is increased without increasing the cost of the material due to the increase in material and the cost of transportation due to the increase in weight. The flow rate passing through the coil 4 and the W-phase coil 6 can be made equal.
Therefore, the V-phase coil 5 has the same cooling performance as the U-phase coil 4 and the W-phase coil 6, and the V-phase coil 5 is prevented from overheating.

  Moreover, since the cooling fan 13 which guides outside air into the wind tunnel 1 corresponding to each of the U-phase coil 4, the V-phase coil 5 and the W-phase coil 6 is provided on the side surface of the wind tunnel 1, It flows equally to each of the U-phase coil 4, the V-phase coil 5, and the W-phase coil 6, thereby preventing flow rate variations.

Embodiment 2. FIG.
5 is a plan view of a dry transformer according to Embodiment 2 of the present invention, FIG. 6 is a plan view of the wind tunnel 1 of FIG. 5, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 6 is a cross-sectional view taken along line VIII-VIII in FIG. 5.
In this embodiment, the width dimension (reference numeral C in FIG. 7) of the V-phase air passage 14a between the inner wall surface of the V-phase air passage plate portion 7a and the outer peripheral surface of the V-phase coil 5 is the U-phase air passage plate. The width dimension of the U-phase air passage 14b between the inner wall surface of the portion 7b and the outer peripheral surface of the U-phase coil 4, and the W-phase between the inner wall surface of the W-phase air passage plate portion 7c and the outer peripheral surface of the W-phase coil 4 It is larger than the width dimension of the air passage 14c (symbol D in FIG. 8). The width dimension of the W-phase air path 14c is the same as the width dimension of the U-phase air path 14a.
The V-phase airway cross-sectional area Sv of the V-phase airway 14a is equal to the U-phase airway cross-sectional area Su of the U-phase airway 14b and the W-phase airway cross-sectional area Sw of the W-phase airway 14c.
Other configurations are the same as those of the dry transformer of the first embodiment.

In the case of the dry type transformer of this embodiment, for example, unlike the dry type transformer of the first embodiment, there is a margin dimension for expanding the V phase air path 14 a between the V phase air path 14 a and the side surface of the wind tunnel 1. Applies to
That is, by making the width dimension of the V-phase air path 14a larger than the width dimension of the U-phase air path 14b and the width dimension of the W-phase air path 14c, the V-phase air path cross-sectional area Sv of the V-phase air path 14a is The U-phase air passage cross section Su of the U-phase air passage 14b and the W-phase air passage cross-section Sw of the W-phase air passage 14c are equal to each other, and the flow rate of the air passing through the V-phase coil 5 is U It becomes equal to the flow rate which passes through phase coil 4 and W phase coil 6.
Therefore, the V-phase coil 5 has the same cooling performance as that of the U-phase coil 4 and the W-phase coil 6, and the V-phase coil 5 is prevented from overheating.
Compared with the dry transformer of the first embodiment, the V-phase wind path cross-sectional area Sv, the U-phase wind path cross-sectional area Su, and the W-phase wind path cross-sectional area Sw are large, and the V-phase coil 5 and the U-phase coil are correspondingly larger. The cooling performance of the 4 and W phase coils 6 is high.

In each of the above embodiments, the case of a dry transformer as a dry static inductor has been described. However, the present invention can also be applied to a dry reactor.
Alternatively, a dry static inductor that cools the V-phase coil, the U-phase coil, and the W-phase coil with air generated by natural convection without using the cooling fan 13 that forcibly flows air into the wind tunnel 1 may be used.
Furthermore, it may be a static inductor in which a low voltage coil is disposed concentrically with the high voltage coil on the outer periphery of the high voltage coil.

  DESCRIPTION OF SYMBOLS 1 Wind tunnel, 2 Support tool, 3 Iron core, 4 U phase coil, 5 V phase coil, 6 W phase coil, 7 Air path board, 7a V phase air path board part, 7b U phase air path board part, 7c W phase wind Road plate part, 8 leg part, 9 yoke part, 10 low voltage coil part, 11 high voltage coil part, 13 cooling fan, 14a V phase air path, 14b U phase air path, 14c W phase air path, Su U phase air path Cross-sectional area, Sv V-phase airway cross-sectional area, Sw W-phase airway cross-sectional area.

Claims (5)

An inductor body in which a U-phase coil, a V-phase coil, and a W-phase coil are sequentially arranged in a line;
A box-shaped wind tunnel surrounding the lower periphery of the inductor body,
A wind path plate that surrounds the entire circumference of the inductor body in the wind tunnel and guides air from the wind tunnel to the top of the inductor body, and
The U-phase coil, the V-phase coil, and the W-phase coil each have a low voltage coil portion, a high voltage coil portion that is disposed concentrically with the low voltage coil portion,
The air path plate includes a U phase air path plate portion surrounding the U phase coil, a V phase air path plate portion surrounding the V phase coil, and a W phase air path plate portion surrounding the W phase coil. Are connected in series,
The V-phase air passage cross-sectional area of the V-phase air passage between the inner wall surface of the V-phase air passage plate portion and the outer peripheral surface of the V-phase coil is the inner wall surface of the U-phase air passage plate portion and the U-phase coil. W-phase wind path breakage of the W-phase wind path between the inner wall surface of the W-phase wind path plate portion and the outer peripheral surface of the W-phase coil Equal to the area,
Each of the air flows through the U-phase coil, the V-phase coil, and the W-phase coil from the wind tunnel has the same flow rate.   The U-phase air passage plate portion and the W-phase air passage plate portion are arranged such that their respective central axes are on the side of the central axis of the V-phase coil with respect to the central axes of the U-phase coil and the W-phase coil. The dry static induction device according to claim 1, wherein the dry static induction device is arranged so as to be biased.   2. The dry static induction machine according to claim 1, wherein a width dimension of the V-phase air path is larger than a width dimension of the U-phase air path and a width dimension of the W-phase air path.   4. The cooling fan according to claim 1, wherein a cooling fan is provided on a side surface of the wind tunnel to guide the outside air into the wind tunnel corresponding to the U-phase coil, the V-phase coil, and the W-phase coil. A dry static induction device according to claim 1.   The dry static inductor according to any one of claims 1 to 4, wherein the dry static inductor is a transformer.

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