JP7204954B2 - stationary inductor - Google Patents

Description

The present invention relates to stationary inducers.

Power lines are placed higher than the surrounding buildings. As a result, the transmission line is exposed to an environment that is subject to natural phenomena over long distances. When a transmission line is struck by lightning and an impulsive current (voltage) such as a lightning surge propagates through the transmission line, the impulsive current flows into a stationary inductor such as a transformer or reactor connected to the transmission line. There is

During normal operation, the potential of the coil has a uniform potential distribution proportional to the number of turns. However, when an impulsive current flows into a transformer or the like, an oscillation phenomenon occurs in the potential of the coil due to the relationship between the circuit constants of the transformer and the circuit breaker, resulting in uneven potential distribution. If the potential distribution of the coil becomes uneven, the potential of the coil becomes higher than in the case of normal operation, and dielectric breakdown is more likely to occur.

In order to avoid such dielectric breakdown of the coil, for example, Patent Document 1 and Patent Document 2 propose a method of arranging a shield between windings of a wound coil. By arranging the shield between the windings, the capacitance between the windings increases, and the potential distribution when the impact current flows is made uniform. Such a shield is called an inner shield.

Japanese Utility Model Laid-Open No. 55-112828 Japanese Utility Model Laid-Open No. 2-91324

However, in a stationary inductor with an inner shield, eddy currents may be generated in the inner shield as magnetic flux lines generated by current flowing through the coil pass through the inner shield. If an eddy current flows, the inner shield may generate heat.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stationary inductor that efficiently dissipates heat generated in an inner shield.

A stationary inductor according to the invention comprises an iron core, a coil group and a cooling fluid. The core extends in one direction. The coil group includes at least a first coil formed by a first winding wound around an iron core. A cooling fluid cools the coil groups. In the first coil, the inner shield portion is arranged between the first windings that are radially adjacent to each other in the first winding wound around the iron core. The inner shield portion is formed with a channel through which the cooling fluid flows along one direction.

According to the stationary inductor according to the present invention, in the first coil formed by the first winding wound around the iron core in the coil group, An inner shield portion is arranged between adjacent first windings, and a flow path is formed in the inner shield portion through which a cooling fluid flows along one direction. As a result, the heat generated by the eddy current generated in the inner shield portion by the leakage magnetic flux lines can be efficiently dissipated.

1 is a perspective view of a stationary inducer according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of the stationary inductor along the cross-sectional line II-II shown in FIG. 1 in the same embodiment; FIG. 3 is a partial cross-sectional view of the stationary inductor along the cross-sectional line III-III shown in FIG. 2 in the same embodiment; FIG. 3 is a partial cross-sectional view of the stationary inductor along the cross-sectional line IV-IV shown in FIG. 2 in the same embodiment; FIG. 4 is a partial cross-sectional perspective view showing a high-voltage coil group and a low-voltage coil group in the same embodiment; 6 is a partially enlarged cross-sectional perspective view showing the structure within the dotted line frame shown in FIG. 5 in the same embodiment. FIG. 7 is a partially enlarged cross-sectional perspective view showing the structure within the dotted line frame shown in FIG. 6 in the same embodiment. FIG. FIG. 4 is a partial cross-sectional perspective view showing a high-voltage coil group and a low-voltage coil group in a stationary inductor according to a comparative example; 9 is a partially enlarged cross-sectional perspective view showing the structure within the dotted line frame shown in FIG. 8. FIG. FIG. 4 is a diagram schematically showing lines of magnetic flux generated in a stationary inductor; FIG. 5 is a partially enlarged cross-sectional perspective view showing an eddy current generated in a high-voltage coil in a stationary inductor according to a comparative example; FIG. 5 is a diagram schematically showing the flow of insulating oil in a stationary inductor according to a comparative example; FIG. 4 is a partially enlarged cross-sectional perspective view showing an eddy current generated in a high-voltage coil in the same embodiment; FIG. 4 is a diagram schematically showing the flow of insulating oil in the same embodiment; FIG. 4 is a partial cross-sectional view showing the flow of insulating oil more specifically in the same embodiment. FIG. 4 is a diagram for explaining heat dissipation by insulating oil in the same embodiment; FIG. 10 is a partial cross-sectional perspective view showing a high-voltage coil group and a low-voltage coil group in the stationary inductor according to Embodiment 2; 18 is a partially enlarged cross-sectional perspective view showing the structure within the dotted line frame shown in FIG. 17 in the stationary inducer according to the first example in the same embodiment. FIG. FIG. 4 is a partial plan view of a stationary inducer according to a first example in the same embodiment; FIG. 4 is a diagram schematically showing the flow of insulating oil in the stationary inductor according to the first example in the same embodiment; 18 is a partially enlarged cross-sectional perspective view showing the structure within the dotted line frame shown in FIG. 17 in the stationary inducer according to the second example in the same embodiment. FIG. In the same embodiment, it is a partial plan view of a stationary inducer according to a second example. FIG. 10 is a diagram schematically showing a flow of insulating oil in a stationary inductor according to a second example in the same embodiment; FIG. 11 is a partial cross-sectional perspective view showing a high-voltage coil group and a low-voltage coil group in a stationary inductor according to Embodiment 3; FIG. 25 is a partially enlarged cross-sectional perspective view showing the structure within one dotted line frame shown in FIG. 24 in the same embodiment; 25 is a partially enlarged cross-sectional perspective view showing another structure within the dotted line frame shown in FIG. 24 in the same embodiment. FIG. FIG. 4 is a diagram schematically showing the flow of insulating oil in a stationary inductor in the same embodiment; FIG. 11 is a perspective view of a stationary inducer according to Embodiment 4;

Embodiment 1.
As an example of the stationary inductor according to Embodiment 1, for example, a core-type transformer will be described. As shown in FIGS. 1, 2 and 3, the stationary inductor 1 comprises an iron core 3, a high voltage coil group 5, a low voltage coil group 21 and a tank 31. FIG. The iron core 3 is provided with a main leg portion 3a. A high voltage coil group 5 and a low voltage coil group 21 are each formed around the main leg 3a.

The iron core 3 , the high voltage coil group 5 and the low voltage coil group 21 are housed inside the tank 31 . The tank 31 is filled with insulating oil 33 as a cooling fluid. The insulating oil 33 also functions as a cooling medium. Mineral oil, ester oil, silicon oil, or the like, for example, is used as insulating oil 33 . The high voltage coil group 5 and the like are immersed in insulating oil 33 .

High-voltage coil group 5 is arranged between interlayer insulating plates 29 . In the high-voltage coil group 5, a plurality of high-voltage coils 7 including a high-voltage coil 7 as a first coil formed by a high-voltage winding 9 as a first winding wound around the main leg portion 3a. A plurality of them are arranged at intervals in the extending direction of the portion 3a.

An interlayer insulating spacer 27 is interposed between the high voltage coil group 5 and the interlayer insulating plate 29 at one circumferential position in the circumferential direction of the high voltage coil group 5 . An interlayer insulating spacer 27 is interposed between the high voltage coil group 5 and the interlayer insulating plate 29 .

At one circumferential position, an inter-coil insulating spacer 11 is arranged between one high-voltage coil 7 and another high-voltage coil 7 which are arranged in the extending direction of the main leg portion 3a with an interval therebetween. there is As shown in FIG. 4, at other circumferential positions in the circumferential direction of the high-voltage coil group 5, the interlayer insulating spacers 27 and the inter-coil insulating spacers 11 are not arranged, and the insulating oil 33 serving as the cooling fluid flow path. A space is formed.

In the high voltage coil group 5, the inner shield portion 13 is arranged between the high voltage windings 9 that are radially adjacent to each other in the high voltage windings 9 wound around the main leg portion 3a. The inner shield portion 13 will be described later. Note that the number and thickness of each of the interlayer insulating plates 29 and the interlayer insulating spacers 27 are merely an example. A spacer 27 is arranged.

The low voltage coil group 21 is arranged inside the high voltage coil group 5 . In the low-voltage coil group 21, a low-voltage coil 23 is formed by a low-voltage winding 25 wound around the main leg 3a. A plurality of low-voltage coils 23 are arranged at intervals in the extending direction of the main leg portion 3a. Low-voltage coil group 21 is arranged between interlayer insulating plates 29 . An interlayer insulating spacer 27 is interposed between the low voltage coil group 21 and the interlayer insulating plate 29 .

Next, the inner shield portion 13 will be described in detail. As shown in FIG. 5 , the inner shield portion 13 is provided on the high-voltage coil 7 . FIG. 6 is an enlarged view of the structure within the dotted line frame E1 shown in FIG. Furthermore, FIG. 7 is an enlarged view of the structure within the dotted line frame E2 shown in FIG. As shown in FIG. 6, the inner shield portion 13 includes a first portion 9a of the high-voltage winding 9 positioned on the outermost periphery of the high-voltage winding 9 and a high-voltage winding positioned immediately inside the first portion 9a. 9 and the second portion 9b. As shown in FIG. 7, the inner shield portion 13 includes a first shield conductor portion 13a, a second shield conductor portion 13b, and an insulator 13c as a first insulator.

As shown in FIG. 7, the first shield conductor portion 13a is arranged on the inner peripheral surface side of the first portion 9a of the high-voltage winding 9. As shown in FIG. The second shield conductor portion 13b is arranged on the outer peripheral surface side of the second portion 9b of the high voltage winding 9 . An insulator 13c is interposed between the first shield conductor portion 13a and the second shield conductor portion 13b.

The first shield conductor portion 13a and the second shield conductor portion 13b are spaced apart in the radial direction by the insulator 13c, so that the distance between the first shield conductor portion 13a and the second shield conductor portion 13b is increased. A flow path 16 through which the insulating oil 33 flows is formed in. Since the insulating oil 33 flows through the flow path 16 in addition to the flow path 15, the heat generated by the eddy current generated in the inner shield portion 13 can be efficiently dissipated. This will be described in comparison with a stationary inducer according to a comparative example.

As shown in FIGS. 8 and 9 , in the static inductor 1 according to the comparative example, an inner shield 113 is provided between the high voltage windings 9 of the high voltage coil 7 . 9 is an enlarged view of the structure within the dotted line frame E2 shown in FIG. Also, the same reference numerals are given to the same configurations as those of the stationary inducer 1 according to Embodiment 1, and the description thereof will not be repeated unless necessary.

As described above, when an impulsive current (voltage) such as a lightning surge flows from a transmission line into a stationary inductor, the potential distribution of the high-voltage coil 7 of the high-voltage coil group 5 becomes uneven, and dielectric breakdown is likely to occur. Become. In order to prevent such dielectric breakdown, in the high-voltage winding 9, an inner shield 113 is provided between the first portion 9a of the outermost high-voltage winding 9 and the second portion 9b of the high-voltage winding 9 inside thereof. is provided. The inner shield 113 increases the capacitance between the high-voltage windings 9, makes the potential distribution of the high-voltage coil 7 uniform, and suppresses dielectric breakdown.

As shown in FIG. 10 , in the stationary inductor 1 , magnetic flux lines 41 generated by current flowing through the high-voltage coil group 5 and the like include leakage magnetic flux lines 41 a (component) passing through the inner shield 113 . As shown in FIG. 11, an eddy current 43 is generated in the inner shield 113 by this leakage magnetic flux line 41a. When the eddy current 43 flows, the inner shield 113 will generate heat.

As shown in FIG. 12, in the high voltage coil group 5 of the stationary inductor 1 according to the comparative example, a plurality of high voltage coils 7 are arranged along the direction in which the main leg portion 3a extends. In the plurality of high-voltage coils 7, a flow path 15 through which insulating oil flows is provided between one high-voltage coil 7 and another high-voltage coil 7 adjacent to each other in the extending direction.

In the stationary inductor 1 according to the comparative example, the high-voltage coil group 5 and the like are cooled by sequentially flowing insulating oil as a cooling medium through the flow path 15, but the heat generated in the inner shield 113 is dissipated. is assumed to be insufficient for

In contrast to the comparative example, as shown in FIG. 13, in the static inductor 1 according to Embodiment 1, the inner shield portion 13 includes a first shield conductor portion 13a, a second shield conductor portion 13b, and an insulator 13c. I have. The first shield conductor portion 13a and the second shield conductor portion 13b are radially spaced apart from each other by the insulator 13c. As a result, a channel 16 through which the insulating oil 33 flows is formed between the first shield conductor portion 13a and the second shield conductor portion 13b.

In the stationary inductor 1, leakage magnetic flux lines 41a (components) passing through the inner shield portion 13 among the magnetic flux lines 41 generated by current flowing through the high-voltage coil group 5 and the like cause eddy currents in the first shield conductor portion 13a. 43a is generated, and an eddy current 43b is generated in the second shield conductor portion 13b. The first shield conductor portion 13a generates heat due to the eddy current 43a, and the second shield conductor portion 13b generates heat due to the eddy current 43b.

As shown in FIGS. 14 and 15, the insulating oil 33 (see FIG. 1) flows through the flow path 15 between one high-voltage coil 7 and the other adjacent high-voltage coil 7, and also flows through the first shield conductor portion 13a. and the second shield conductor portion 13b.

Therefore, the amount of heat Q also moves between the first shield conductor portion 13 a and the like and the insulating oil 33 . Here, for example, FIG. 16 schematically shows the partial temperature distribution of the structure within the dotted line frame E4 shown in FIG. As shown in FIG. 16, the amount of heat Q is given by (T1-T2)/R obtained by dividing the temperature difference between the temperature T1 of the second shield conductor 13b and the temperature T2 of the insulating oil by the thermal resistance R. Note that R is given by 1/(h·A) obtained by dividing the reciprocal of the heat transfer coefficient h by the contact area A between the second shield conductor portion 13 b and the like and the insulating oil 33 .

As the amount of heat Q moves from the second shield conductor portion 13b to the insulating oil 33, the temperature of the second shield conductor portion 13b also decreases. As for the first shield conductor portion 13a, heat is transferred from the first shield conductor portion 13a to the insulating oil 33 in the same manner as the second shield conductor portion 13b.

Accordingly, compared to the stationary inductor 1 according to the comparative example in which the insulating oil 33 flows only through the flow path 15, in the stationary inductor 1 according to Embodiment 1, the insulating oil 33 is By flowing through the flow path 16 between the first shield conductor portion 13a and the second shield conductor portion 13b, the inner shield portion 13 can be cooled more efficiently.

In addition, when an eddy current is generated, a loss due to the eddy current is generated, and the efficiency of power conversion is lowered. As shown in FIGS. 13 and 11, in the stationary inductor 1 according to the first embodiment, the insulator 13c is interposed between the first shield conductor portion 13a and the second shield conductor portion 13b, so that leakage magnetic flux The cross-sectional areas of the first shield conductor portion 13a and the second shield conductor portion 13b through which the line 41a passes are smaller than the cross-sectional area of the inner shield 113 through which the leakage magnetic flux line 41a passes in the stationary inductor 1 according to the comparative example.

That is, in the stationary inductor 1 according to the comparative example, the cross-sectional area S1 of the inner shield 113 through which the leakage magnetic flux lines 41a pass, whereas in the stationary inductor 1 according to the first embodiment, the inner shield portion through which the leakage magnetic flux lines 41a pass. The cross-sectional area of 13 is the sum of the cross-sectional area S2 of the first shield conductor portion 13a and the cross-sectional area S3 of the second shield conductor portion 13b.

Each of the cross-sectional area S2 and the cross-sectional area S3 is smaller than the cross-sectional area S1, and the eddy current (current i2) generated in the first shield conductor 13a and the eddy current (current i3 ) is lower than the eddy current (current i1) generated in the inner shield 113 . As a result, loss associated with eddy currents can be reduced, and as a result, efficiency of power conversion can be improved.

In particular, when the flow path 16 formed between the first shield conductor portion 13a and the second shield conductor portion 13b is substantially parallel to the direction of the leakage magnetic flux line 41a, the efficiency of power conversion is most improved. can be done. In addition, the inner shield portion 13 increases the capacitance between the high-voltage windings 9, so that the high-voltage windings 9 can have high insulation.

Embodiment 2.
Variations of the inner shield portion will be described as the stationary inductor according to the second embodiment. As shown in FIG. 17, the inner shield portion 13 of the stationary inductor 1 is arranged between the high voltage winding 9 located on the outermost periphery and the high voltage winding 9 located immediately inside thereof. First, the inner shield portion 13 of the stationary inducer according to the first example will be described. The same reference numerals are given to the same configurations as those of the stationary inducer 1 shown in FIG. 2 and the like, and the description thereof will not be repeated unless necessary.

(first example)
As shown in FIGS. 18 and 19, in the stationary inductor 1 according to the first example, an inner shield portion 13 having a wire mesh-like conductor portion 13d as a shield conductor portion is arranged. The wire mesh-like conductor portion 13d is formed in a tubular shape. 18 is an enlarged view of the structure within the dotted line frame E5 shown in FIG.

In the cylindrical wire-mesh-like conductor portion 13d, the mesh becomes the channel 16 through which the insulating oil 33 (see FIG. 1) flows. Therefore, the insulating oil 33 can flow from the outer region to the inner region of the tubular wire mesh conductor 13d, and the inner region to the outer region of the tubular wire mesh conductor 13d. Insulating oil 33 can be circulated.

As a result, in the stationary inductor 1 according to the first example, as shown in FIGS. As it flows, it flows through the meshes of the cylindrical wire-mesh conductor portion 13d as the channel 16 (see arrows 51 and 53). As a result, it is possible to efficiently dissipate heat generated by eddy currents generated in the wire-mesh conductor portion 13d by leakage magnetic flux lines, and to efficiently cool the high-voltage coil group 5 and the like including the wire-mesh conductor portion 13d.

(Second example)
As shown in FIGS. 21 and 22, in the stationary inductor 1 according to the second example, an inner shield portion 13 having a cylindrical conductor portion 13e as a shield conductor portion is arranged. The cylindrical conductor portion 13e is arranged between the high-voltage windings 9 adjacent to each other in the radial direction. An opening 14 is formed in a side portion of the cylindrical conductor portion 13e. 21 is an enlarged view of the structure within the dotted line frame E5 shown in FIG.

In the cylindrical conductor portion 13e, the opening 14 formed in the side portion of the cylindrical conductor portion 13e serves as the flow path 16 through which the insulating oil 33 flows. Therefore, the insulating oil 33 can be circulated from the outer region to the inner region of the tubular conductor portion 13e, and the insulating oil 33 can be circulated from the inner region to the outer region of the tubular conductor portion 13e. be able to.

As a result, in the stationary inductor 1 according to the second example, as shown in FIGS. As it flows, it flows through the opening 14 of the tubular conductor 13e as the flow path 16 (see arrows 51 and 53). As a result, the heat generated by the eddy current generated in the cylindrical conductor portion 13e by the leakage magnetic flux lines can be efficiently dissipated, and the high-voltage coil group 5 and the like including the cylindrical conductor portion 13e can be efficiently cooled.

Embodiment 3.
A stationary inducer according to Embodiment 3 will be described. As shown in FIG. 24 , in the static inductor 1 , the inner shield portion 13 is arranged in the high voltage coil 7 as the first coil arranged at a position close to the high voltage winding end 8 . On the other hand, an insulating spacer 17 as a second insulator is arranged in the high voltage coil 7 as the second coil, which is arranged at a position relatively distant from the high voltage winding end 8 in the extending direction of the main leg portion 3a. ing.

FIG. 25 is an enlarged view of the structure within the dotted line frame E6 shown in FIG. As shown in FIG. 25, the inner shield portion 13 includes a first portion 9a of the high-voltage winding 9 as the first winding, which is located on the outermost periphery closest to the high-voltage winding end 8, It is arranged between the second portion 9b of the high-voltage winding 9 positioned immediately inside it. A gap serving as a flow path 16 is provided between the first shield conductor portion 13a and the second shield conductor portion 13b. In order to provide the flow path 16, for example, an insulator 13c (see FIG. 7) may be interposed between the first shield conductor portion 13a and the second shield conductor portion 13b.

FIG. 26 is an enlarged view of the structure within the dotted line frame E7 shown in FIG. As shown in FIG. 26, the insulating spacer 17 is formed between the first portion 9a of the high-voltage winding 9 positioned on the outermost circumference of the high-voltage winding 9 as the second winding and the high-voltage winding positioned immediately inside the first portion 9a. 9 and the second portion 9b. No shield conductor is arranged between the high-voltage windings 9 with the insulating spacer 17 interposed therebetween. The same reference numerals are given to the same configurations as those of the stationary inducer 1 shown in FIG. 2 and the like, and the description thereof will not be repeated unless necessary.

When an impulsive current such as a lightning surge flows into the stationary inductor 1, the potential distribution of the high-voltage winding 9 of the high-voltage coil 7 closest to the high-voltage winding end 8 in the high-voltage coil group 5 is most likely to become uneven. As the distance from the high voltage winding end 8 increases, the potential distribution of the high voltage winding 9 approaches a uniform state.

Therefore, it is necessary to arrange an inner shield part in the high-voltage winding 9 of the high-voltage coil 7 closest to the high-voltage winding end 8 . The high-voltage winding 9 does not necessarily need to be provided with an inner shield. However, from the viewpoint of efficiently cooling the stationary inductor 1, it is desirable to additionally provide a flow path for the insulating oil to flow.

In the static inductor 1 described above, from such a point of view, the inner shield part 13 is arranged in the high voltage winding 9 of the high voltage coil 7 closest to the high voltage winding end 8, and the inner shield part 13 is arranged at a position away from the high voltage winding end 8. The high-voltage winding 9 of the high-voltage coil 7 has only the insulating spacer 17 as a second insulator for securing the flow path 16 without arranging the first shield conductor and the second shield conductor. are placed.

Here, the number of stages in which the high-voltage coils 7 are stacked along the direction in which the main leg portion 3a of the iron core 3 extends is defined as Nn stages (N1, N2, . . . Nn) (see FIG. 27). The high-voltage coil 7 arranged at a position distant from the high-voltage winding end 8 corresponds to, for example, the high-voltage coil 7 of the 2×Nn/3th stage or higher. As the insulating spacer 17, for example, insulating paper or polyethylene terephthalate (PET), which is generally used as an insulating material inside the transformer, is applied.

Thereby, as shown in FIGS. 25, 26 and 27, the insulating oil 33 flows through the flow paths 16 provided in the respective high voltage coils 7 of the high voltage coil group 5 in addition to the flow paths 15. (See arrows 51, 53). As a result, the inner shield portion 13 can be cooled more efficiently, and the high-voltage coil group 5 and the like can be efficiently cooled.

Further, by arranging the inner shield part 13 in the high-voltage coil 7 closest to the high-voltage winding end 8 where the potential distribution is most uneven, the potential oscillation can be suppressed, and the insulation performance of the static inductor 1 can be improved. can be improved.

Furthermore, by arranging only the insulating spacer 17 for securing the flow path 16 in the high-voltage winding 9 of the high-voltage coil 7 arranged at a position away from the high-voltage winding end 8, the first shield conductor portion In addition, since the second shield conductor is not arranged, the production cost of the stationary inductor 1 can be reduced. An inner shield portion (not shown) may be arranged in the high-voltage winding 9 in the high-voltage coil (not shown) closest to the other high-voltage winding end (not shown) of the high-voltage winding 9 . desirable.

Embodiment 4.
A modified example of the cooling medium will be described as the stationary inductor according to the fourth embodiment. As shown in FIG. 28 , in stationary inductor 1 , tank 31 is filled with, for example, sulfur hexafluoride (SF ₆ ) gas 35 as a cooling medium. Other than this, the configuration including the flow path 16 formed in the inner shield portion 13 arranged in the high-voltage coil group 5 is the configuration of the static inductor 1 described in the first embodiment (FIGS. 2 to 4). 4, etc.), the same reference numerals are given to the same members, and the description thereof will not be repeated unless necessary.

In the stationary inductor 1 described above, even when the tank 31 is filled with sulfur hexafluoride gas 35 as a cooling medium, the direction of the leakage magnetic flux lines is the same as that when the insulating oil 33 is filled. Same as orientation. Between the high-voltage windings 9 of the high-voltage coil group 5 through which the leakage magnetic flux lines pass, a flow path 16 (see FIG. 13, etc.) through which the sulfur hexafluoride gas 35 flows is formed.

As a result, as described in each embodiment, the sulfur hexafluoride gas 35 flows through the flow path 15 between one high-pressure coil 7 and the other adjacent high-pressure coil 7, and also flows through each high-pressure coil. 7 (see FIGS. 13 and 14, etc.). As a result, the heat generated in the inner shield portion 13 can be efficiently dissipated to cool the high-voltage coil group 5 and the like.

In addition, since the cross-sectional area of the inner shield portion 13 (see FIG. 13) through which the leakage magnetic flux lines pass becomes smaller than the cross-sectional area of the inner shield portion (see FIG. 11) of the stationary inductor 1 according to the comparative example, the eddy current It is possible to reduce the loss associated with this, and improve the efficiency of power conversion.

In the static inductor 1 described above, the sulfur hexafluoride gas 35 was used as the cooling fluid, but air may be used as the cooling fluid.

In addition, in the stationary inductor 1 according to each of the above-described embodiments, the inner shield portion 13 includes the first portion 9a of the high-voltage winding 9 located on the outermost periphery and the high-voltage winding located immediately inside the first portion 9a. The case where it is arranged between the second portion 9b of the line 9 has been described. The position at which the inner shield portion 13 is arranged is not limited to between the first portion 9a and the second portion 9b, and may be between one high-voltage winding 9 and another high-voltage winding 9 that are radially adjacent to each other as necessary. may be placed between

It should be noted that the stationary inducer 1 described in each embodiment can be combined in various ways as required.

The embodiment disclosed this time is an example and is not limited to this. The present invention is defined by the scope of the claims rather than the scope described above, and is intended to include all changes within the meaning and scope equivalent to the scope of the claims.

INDUSTRIAL APPLICABILITY The present invention is effectively used for stationary inductors such as transformers or reactors having windings wound around an iron core.

1 stationary inductor 3 iron core 3a main leg 5 high voltage coil group 7 high voltage coil 8 high voltage winding end 9 high voltage winding 9a first part 9b second part 11 intercoil insulating spacer 13 Inner shield part 13a First shield conductor part 13b Second shield conductor part 13c Insulator 13d Wire mesh conductor part 13e Cylindrical conductor part 14 Opening 15, 16 Flow path 17 Insulating spacer 21 Low voltage coil group, 23 low-voltage coil, 25 low-voltage winding, 27 interlayer insulating spacer, 29 interlayer insulating plate, 31 tank, 33 insulating oil, 35 sulfur hexafluoride gas, 41 magnetic flux line, 41a magnetic flux line, 43a, 43b eddy current, 51, 53 arrows, E1-E5 dotted frames.

Claims (10)

an iron core extending in one direction;
a coil group including at least a first coil formed by a first winding wound around the iron core;
a cooling fluid that cools the coil group;
In the first coil, an inner shield portion is arranged between the first windings that are radially adjacent to each other in the first winding wound around the iron core,
The stationary inductor, wherein the inner shield portion is formed with a flow path through which the cooling fluid flows along the one direction. 2. The stationary inductor according to claim 1, wherein said flow path is formed along a direction of leakage magnetic flux passing through said first coil among magnetic fluxes formed by said coil group. The inner shield part is
a first shield conductor;
a second shield conductor positioned inside the first shield conductor with a first distance therebetween;
a first insulator interposed between the first shield conductor and the second shield conductor;
3. The static induction device according to claim 1, wherein said flow path is formed between said first shield conductor and said second shield conductor separated by said first insulator at said first distance. vessel. 3. The stationary inductor according to claim 1, wherein said inner shield portion includes a shield conductor portion formed with an opening as said flow path. The shield conductor portion has a wire mesh shape,
5. The stationary inductor according to claim 4, wherein the mesh of said metal mesh-like shield conductor is used as said opening. The shield conductor is formed in a cylindrical shape along the first winding,
5. The stationary inductor according to claim 4, wherein said opening is formed in a side portion of said tubular shield conductor. The inner shield portion includes a first portion of the first winding positioned on the outermost circumference of the first winding and a second portion of the first winding positioned immediately inside the first portion. A stationary inducer according to any one of claims 1 to 6, arranged between The coil group includes a second coil spaced from the first coil in the one direction and formed by a second winding wound around the iron core;
the first winding and the second winding are part of windings forming the coil group;
The second coil is arranged at a position farther from the winding ends of the winding than the first coil,
In the second coil,
A second insulator is disposed between the second windings that are radially adjacent to each other in the second winding wound around the iron core,
A second flow path is formed between said radially adjacent second windings separated by a second distance by said second insulator. A stationary inductor according to any one of the preceding claims. A stationary inductor according to any preceding claim, wherein the cooling fluid is insulating oil. A stationary inductor according to any one of claims 1 to 8, wherein the cooling fluid is a gas selected from sulfur hexafluoride gas and air.

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