JP7499727B2 - Static induction equipment - Google Patents

Description

This disclosure relates to stationary induction devices.

JP 2014-7298 A (Patent Document 1) is a prior document that discloses the configuration of an oil-filled stationary induction electric appliance. The oil-filled stationary induction electric appliance described in Patent Document 1 includes a multi-stage disk winding, an inner insulating tube, an outer insulating tube, and a spacing ring. The multi-stage disk winding has horizontal flow paths for insulating oil formed between each stage along the axial direction. The inner insulating tube is installed coaxially on the inner side of the multi-stage disk winding, and a vertical flow path for insulating oil is formed between the innermost winding and the tube wall surface. The outer insulating tube is installed coaxially on the outer side of the multi-stage disk winding, and a vertical flow path for insulating oil is formed between the outermost winding and the tube wall surface. The spacing ring is disposed between at least one of the innermost and outermost windings of the disk winding and the winding adjacent to that winding. In the spacing ring, insulating spacing pieces that ensure vertical flow paths for insulating oil between the windings are scattered along the circumferential direction of the ring-shaped shield conductor.

JP 2014-7298 A

The stationary induction machine described in Patent Document 1 has room for improving the cooling efficiency of the refrigerant.

This disclosure was made in consideration of the above problems, and aims to provide a stationary induction device that can improve the cooling efficiency of the refrigerant.

The stationary induction machine according to the present disclosure includes an iron core, a first cylindrical winding, a second cylindrical winding, an insulating tube, and an insulating barrier. The first cylindrical winding is wound around the iron core. The second cylindrical winding is wound around the iron core and is located outside the first cylindrical winding. The insulating tube is disposed between the first cylindrical winding and the second cylindrical winding. The insulating barrier is disposed on the outer circumferential side of the insulating tube. A first vertical flow path is formed between the insulating tube and the second cylindrical winding, extending vertically and through which a refrigerant flows. The second cylindrical winding is formed with a plurality of horizontal flow paths that are spaced apart from each other in the vertical direction and are continuous with the first vertical flow path and extend horizontally through which a refrigerant flows. The second cylindrical winding includes a first winding section and a second winding section. Only a plurality of horizontal flow paths are formed in the first winding section. The second winding section is spaced apart from the first winding section in the vertical direction. The second winding section is formed with a plurality of horizontal flow paths and a second vertical flow path that extends vertically and through which the coolant flows. The insulating barrier covers the upper surface and the inner peripheral side of the second winding section. The plurality of horizontal flow paths include a first horizontal flow path and a second horizontal flow path that is higher than the height of the first horizontal flow path. The second horizontal flow path is located at the boundary between the first winding section and the second winding section and is continuous with the second vertical flow path.

According to the present disclosure, by making the height of the second horizontal flow passage that is continuous with the second vertical flow passage formed inside the second cylindrical winding higher than the height of the first horizontal flow passage that is not continuous with the second vertical flow passage, and thereby increasing the flow passage area of the second horizontal flow passage, it is possible to ensure the flow rate of the refrigerant flowing through the second vertical flow passage and improve the cooling efficiency of the refrigerant.

1 is a perspective view showing a configuration of a stationary induction device according to an embodiment; FIG. 2 is an enlarged partial cross-sectional view of a portion II in FIG. 1 . FIG. 4 is a partial cross-sectional view showing a coolant flow path provided around the second cylindrical winding. 4 is a partial cross-sectional view taken along the line IV-IV in FIG. 3 . 4 is a partial cross-sectional view taken along the line VV in FIG. 3 . FIG. 11 is a partial cross-sectional view showing a second insulating spacer according to a modified example.

A static induction device according to one embodiment will be described below with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings will be given the same reference numerals, and the description will not be repeated. Note that in the following embodiment, a core-type transformer will be described as an example of a static induction device, but the static induction device is not limited to a core-type transformer, and may also include, for example, a reactor.

Figure 1 is a perspective view showing the configuration of a stationary induction device according to one embodiment. In Figure 1, one of the three windings is cut in stages to explain the winding configuration. Figure 2 is an enlarged partial cross-sectional view of part II in Figure 1.

As shown in Figures 1 and 2, the stationary induction device 100 according to one embodiment includes an iron core 110, a first cylindrical winding 121, a second cylindrical winding 122, an insulating cylinder, and an insulating barrier 127. The stationary induction device 100 according to this embodiment is a so-called core-type transformer.

The iron core 110 is constructed by laminating multiple silicon steel plates. Since the stationary induction device 100 according to this embodiment is a three-phase transformer, the iron core 110 has three legs. A cylindrical winding is arranged on each leg of the iron core 110, with the leg as the central axis.

The first cylindrical winding 121 is wound around the legs of the iron core 110. The second cylindrical winding 122 is wound around the legs of the iron core 110 and is located outside the first cylindrical winding 121. In each of the first cylindrical winding 121 and the second cylindrical winding 122, a coated conductor wire is wound in a disk shape or a spiral shape.

A first insulating tube 123 made of an insulating material such as pressboard or epoxy resin is disposed between the legs of the iron core 110 and the first cylindrical winding 121. A second insulating tube 124 made of an insulating material such as pressboard or epoxy resin is disposed between the first cylindrical winding 121 and the second cylindrical winding 122. A third insulating tube 125 made of an insulating material such as pressboard or epoxy resin is disposed on the outside of the second cylindrical winding 122.

Between the first cylindrical winding 121 and the first insulating cylinder 123, multiple electrically insulating rectangular column-shaped first spacers 131 are arranged at equal intervals in the circumferential direction of the first cylindrical winding 121.

The first spacer 131 is sandwiched between the first cylindrical winding 121 and the first insulating cylinder 123, and the first spacer 131 ensures a gap between the first cylindrical winding 121 and the first insulating cylinder 123. In this embodiment, the first spacer 131 is made of an insulating material such as epoxy resin.

Between the first cylindrical winding 121 and the second insulating cylinder 124, multiple electrically insulating rectangular column-shaped second spacers 132 are arranged at equal intervals in the circumferential direction of the first cylindrical winding 121.

The second spacer 132 is sandwiched between the first cylindrical winding 121 and the second insulating cylinder 124, and the second spacer 132 ensures a gap between the first cylindrical winding 121 and the second insulating cylinder 124. In this embodiment, the second spacer 132 is made of an insulating material such as epoxy resin.

Between the second cylindrical winding 122 and the second insulating cylinder 124, multiple electrically insulating rectangular prism-shaped third spacers 133 are arranged at equal intervals in the circumferential direction of the second cylindrical winding 122.

The third spacer 133 is sandwiched between the second cylindrical winding 122 and the second insulating cylinder 124, and the third spacer 133 ensures a gap between the second cylindrical winding 122 and the second insulating cylinder 124. In this embodiment, the third spacer 133 is made of an insulating material such as epoxy resin.

A circular pressboard 126 is arranged to face both vertical ends of the second cylindrical winding 122. An electrostatic shield (not shown) is arranged between the pressboard 126 and the second cylindrical winding 122.

The insulating barrier 127 is disposed on the outer periphery of the second insulating cylinder 124. The insulating barrier 127 is made of angle pressboard. The insulating barrier 127 is disposed so as to cover the high electric field portion HV of the second cylindrical winding 122 shown in FIG. 2.

In this embodiment, the stationary induction device 100 is provided with insulating oil as a refrigerant. Note that the refrigerant is not limited to insulating oil and may be insulating gas. The refrigerant circulates inside the stationary induction device 100 by natural convection.

Figure 3 is a partial cross-sectional view showing the refrigerant flow path provided around the second cylindrical winding. In Figure 3, the arrows indicate the flow of refrigerant by natural convection. As shown in Figures 2 and 3, a first vertical flow path D21 is formed between the second insulating cylinder 124 and the second cylindrical winding 122, extending vertically and through which the refrigerant flows. The first vertical flow path D21 is secured by the third spacer 133.

The second cylindrical winding 122 has a plurality of horizontal flow paths that are arranged vertically at intervals from one another, extend horizontally while continuing with the first vertical flow path D21, and through which the refrigerant flows. The horizontal flow paths include a plurality of first horizontal flow paths D11 and a second horizontal flow path D12. The height H2 of the second horizontal flow path D12 is higher than the height H1 of each of the plurality of first horizontal flow paths D11.

The second cylindrical winding 122 includes a first winding section 122a and a second winding section 122b. The first winding section 122a has only a plurality of first horizontal flow paths D11. The second winding section 122b has a plurality of first horizontal flow paths D11 and a second vertical flow path D22 that extends vertically and through which the refrigerant flows.

The second winding section 122b is aligned vertically with a gap between it and the first winding section 122a. The second horizontal flow path D12 is located at the boundary between the first winding section 122a and the second winding section 122b, and is continuous with the second vertical flow path D22.

The insulating barrier 127 covers the upper surface and inner peripheral side of the second winding section 122b. The vertically extending portion of the insulating barrier 127 is located between the second insulating tube 124 and the second cylindrical winding 122. The horizontally extending portion of the insulating barrier 127 is located between the electrostatic shield and the second cylindrical winding 122. The insulating barrier 127 increases the dielectric strength between the first cylindrical winding 121 and the second cylindrical winding 122.

The width of the portion of the first vertical flow path D21 where the insulating barrier 127 is not arranged is W1. The width of the first vertical flow path D21a located between the insulating barrier 127 and the second winding section 122b in the portion of the first vertical flow path D21 where the insulating barrier 127 is arranged is W1a. The width W1a of the first vertical flow path D21a is smaller than the width W1 of the first vertical flow path D21. The first vertical flow path D21a is secured by an electrically insulating spacer (not shown) that is sandwiched between the insulating barrier 127 and the second winding section 122b.

Figure 4 is a partial cross-sectional view taken along the line IV-IV in Figure 3. As shown in Figure 4, the first horizontal flow path D11 is ensured by a plurality of first insulating spacers 140 spaced apart from one another in the circumferential direction in each of the first winding section 122a and the second winding section 122b.

The first insulating spacer 140 has a generally rectangular parallelepiped shape. The first insulating spacer 140 is made of an insulating material such as epoxy resin. The first insulating spacer 140 engages with each of the third spacer 133 and the fourth spacer 134. Specifically, the first insulating spacer 140 has two recesses formed therein that engage with the third spacer 133 and the fourth spacer 134, respectively.

The fourth spacer 134 is sandwiched between the second cylindrical winding 122 and the third insulating cylinder 125, and has a rectangular prism shape. The multiple fourth spacers 134 are arranged at equal intervals in the circumferential direction of the second cylindrical winding 122. The fourth spacer 134 is made of an insulating material such as epoxy resin.

The second vertical flow path D22 is ensured by disposing electrically insulating spacers (not shown) between the turns of the second winding section 122b. The width of the second vertical flow path D22 is W2. The width W2 of the second vertical flow path D22 is greater than the width W1a of the first vertical flow path D21a.

Figure 5 is a partial cross-sectional view taken along the V-V line in Figure 3. As shown in Figure 5, the stationary induction device 100 further includes a plurality of second insulating spacers 150 sandwiched between the first winding section 122a and the second winding section 122b to ensure a second horizontal flow path D12.

The thickness of the second insulating spacer 150 is greater than the thickness of the first insulating spacer 140. As a result, the height H2 of the second horizontal flow path D12 is greater than the height H1 of each of the multiple first horizontal flow paths D11.

Each of the multiple second insulating spacers 150 has a fan-like shape in which the circumferential length of the second cylindrical winding 122 increases from the inner side to the outer side of the second cylindrical winding 122 when viewed vertically. As a result, the width L2 of the outer end of the second horizontal flow path D12 shown in FIG. 5 is smaller than the width L1 of the outer end of the first horizontal flow path D11 shown in FIG. 4. The second insulating spacer 150 has two recesses that engage with the third spacer 133 and the fourth spacer 134, respectively.

In the stationary induction device 100 according to this embodiment, the second horizontal flow path D12, which has a height H2 higher than the height H1 of each of the multiple first horizontal flow paths D11, is located at the boundary between the first winding section 122a and the second winding section 122b, and is continuous with the second vertical flow path D22. This allows a large amount of refrigerant to be introduced into the second vertical flow path D22. As a result, the second vertical flow path D22 can compensate for the narrow first vertical flow path D21a and supply refrigerant to the first horizontal flow path D11 of the second winding section 122b at a sufficient flow rate, thereby improving the cooling efficiency of the refrigerant.

In addition, by arranging an insulating barrier 127 to cover the high electric field portion HV of the second cylindrical winding 122, the dielectric strength between the first cylindrical winding 121 and the second cylindrical winding 122 can be increased.

In the stationary induction device 100 according to this embodiment, each of the second insulating spacers 150 has a fan-like shape in which the circumferential length of the second cylindrical winding 122 increases from the inner periphery to the outer periphery of the second cylindrical winding 122 when viewed vertically. This makes it possible to make the width L2 of the outer periphery end of the second horizontal flow path D12 smaller than the width L1 of the outer periphery end of the first horizontal flow path D11 when viewed vertically, so that more refrigerant can be introduced into the second vertical flow path D22 than when the first insulating spacer 140 is disposed. As a result, the second winding section 122b can be effectively cooled.

Figure 6 is a partial cross-sectional view showing a second insulating spacer according to a modified example. In Figure 6, the cross-sectional view is the same as in Figure 5.

As shown in FIG. 6, in the static induction device according to the modified example, each of the second insulating spacers 150a has a diamond shape when viewed from the vertical direction. The second insulating spacer 150a has two recesses formed therein that engage with the third spacer 133 and the fourth spacer 134, respectively.

The second horizontal flow path D12 has a narrowed portion N where the width L3 is narrowest on the outer periphery of the connection point with the second vertical flow path D22 when viewed from the vertical direction. This allows more refrigerant to be introduced into the second vertical flow path D22. In addition, the width of the second horizontal flow path D12 is wider on the outer periphery of the narrowed portion N when viewed from the vertical direction, so the contact area between the refrigerant flowing through the second horizontal flow path D12 and the second cylindrical winding 122 can be increased. As a result, each of the first winding section 122a and the second winding section 122b can be effectively cooled.

The above disclosed embodiments are illustrative in all respects and are not intended to be a basis for restrictive interpretation. Therefore, the technical scope of this disclosure is not interpreted solely by the above described embodiments, but is defined based on the claims. It also includes all modifications that are equivalent in meaning to and within the scope of the claims.

100 Stationary induction machine, 110 Iron core, 121 First cylindrical winding, 122 Second cylindrical winding, 122a First winding section, 122b Second winding section, 123 First insulating tube, 124 Second insulating tube, 125 Third insulating tube, 126 Pressboard, 127 Insulating barrier, 131 First spacer, 132 Second spacer, 133 Third spacer, 134 Fourth spacer, 140 First insulating spacer, 150, 150a Second insulating spacer, D11 First horizontal flow path, D12 Second horizontal flow path, D21a, D21 First vertical flow path, D22 Second vertical flow path, HV High electric field section, N Narrowing section.

Claims (3)

With iron core,
a first cylindrical winding wound around the iron core;
a second cylindrical winding wound around the iron core and positioned outside the first cylindrical winding;
an insulating cylinder disposed between the first cylindrical winding and the second cylindrical winding;
an insulating barrier disposed on an outer circumferential side of the insulating cylinder;
a first vertical flow passage extending vertically and through which a refrigerant flows is formed between the insulating cylinder and the second cylindrical winding;
the second cylindrical winding is provided with a plurality of horizontal flow passages arranged at intervals in a vertical direction, extending horizontally while being continuous with the first vertical flow passage, through which the refrigerant flows;
The second cylindrical winding is
a first winding section in which only the plurality of horizontal flow paths are formed;
a second winding section aligned with the first winding section in a vertical direction and spaced apart from the first winding section, in which the horizontal flow paths and second vertical flow paths extending in the vertical direction and through which the coolant flows are formed,
the insulating barrier covers a top surface and an inner peripheral side of the second winding section;
The plurality of horizontal flow paths include a first horizontal flow path and a second horizontal flow path that is higher than the height of the first horizontal flow path,
the second horizontal flow passage is located at a boundary between the first winding section and the second winding section and is continuous with the second vertical flow passage ;
a flow area of the second horizontal flow path is increased by making a height of the second horizontal flow path, which is continuous with the second vertical flow path formed inside the second cylindrical winding, higher than a height of the first horizontal flow path, which is not continuous with the second vertical flow path, thereby ensuring a flow rate of the refrigerant flowing through the second vertical flow path . a plurality of insulating spacers sandwiched between the first winding section and the second winding section to define the second horizontal flow path;
2. The stationary induction device according to claim 1, wherein each of the plurality of insulating spacers has a sector shape, when viewed in a vertical direction, in which a circumferential length of the second cylindrical winding increases from an inner periphery side to an outer periphery side of the second cylindrical winding. a plurality of insulating spacers sandwiched between the first winding section and the second winding section to define the second horizontal flow path;
Each of the plurality of insulating spacers has a diamond shape when viewed in a vertical direction,
The stationary induction device according to claim 1 , wherein the second horizontal flow path has a narrowed portion, the narrowest in width on an outer circumferential side of a connection point with the second vertical flow path, as viewed in the vertical direction.

Images