JP2000208338A - Shell-form electromagnetic induction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the dimension of a transformer by lowering the electric field strength of an insulating medium layer constituting a coil unit forming a high-voltage coil, in such a way that the inner and outer edge sections of the unit facing the internal surface of a laminated iron core have clearances on the iron core side. SOLUTION: The high-voltage coil 41 of shell-form electromagnetic induction device is constituted by winding a shield 34 which relieves electric field concentration around the outer edge sections of a coil conductor 33 which is constituted by arranging a plurality of conductor stands 32 each of which is constituted by winding an insulating tape around a flat type conductor 32 a for an insulation 32b. The shield 34 is constituted by winding an insulating tape around a shield stand. A tying material 45 which ties the coil conductors 33 and shield 34 is composed of a high-tension thread-like tying material, and uses a material obtained by forming reinforced aramid fibers of about 0.5 mm in diameter in a thread-like shape as an insulating high-tension material. The coil conductors 33 and shield 34 are integrated over the whole periphery in such a way that the conductors 33 and shield 34 are tied with the tying material 45 at specific intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-type electromagnetic induction device such as a core-type transformer or a core-type shunt reactor for electric power installed in a substation or the like.

[0002]

2. Description of the Related Art FIG. 8 is a configuration diagram in which a part of a core-type transformer for electric power is cut away to show a cross section. 9 is a plan view of the high-voltage coil unit used in FIG. 8, and FIG. 10 is a partial cross-sectional view of a part of the high-voltage coil unit. In the figure,
1 is a high voltage coil composed of a plurality of units, 2 is a low voltage coil composed of a plurality of units, and an insulating member is superposed between the units of the high voltage coil 1 and the low voltage coil 2. A coil group 11 is formed. Reference numeral 3 denotes an iron core and 4 denotes a tank, which comprises a lower tank 4a and an upper tank 4b.

Reference numeral 5 denotes an insulating barrier, 6 denotes a tongue supporting the weight of the iron core 3 that is inserted between the flanges on the upper surface of the lower tank 4a and inserted into the window portion of the coil group 11 and laminated.
Reference numeral 7 denotes a tongue wedge which is the uppermost surface of the core 3 and is integrated with the coil group 11, and 8 denotes a core presser provided at a position corresponding to the upper surface of the laminated core 3 on the inner surface of the upper tank 4 b to press the core 3. . Reference numeral 9 denotes an insulating member disposed on the side of the insulating barrier 5 at the end of each phase coil. Reference numeral 10 denotes a member inserted between the insulating members 9 to mechanically integrate the coil groups 11 of each phase. It is a wedge.

A coil group 11 of a shell-type transformer is formed by superposing a plurality of high-voltage coil units 1a as shown in FIG. 9 with a similarly formed low-voltage coil unit and an insulating member in which an insulating medium flow path is formed. It is an integrated configuration.

As shown in FIG. 10, the high-voltage coil unit 1a is wound with a tape-shaped insulating paper in a state where a plurality of insulated rectangular conductor wires are arranged in parallel, and the coil conductor 1b is insulated. The coil conductor 1b is wound in a rectangular shape, and a shield 1s in which a conductor having a semicircular cross section for reducing electric field concentration is insulated is arranged on the inner edge and the outer edge to form a high voltage coil unit 1a. ing.
The low-voltage coil unit 2a is similarly formed without the shield of the high-voltage coil unit 1a. The inside of the tank 4 is filled with an insulating oil or an insulating gas that is both an insulating medium and a cooling medium.

The coil group 11 of the shell-type transformer constructed as shown in FIG. 8 is vertically inserted into the lower tank 4a in a vertical state, the iron core 3 is laminated on the window, and the inner edge of the coil group 11 and An insulating member is disposed between the outer edge and the iron core 3 to be structurally integrated, and a portion that becomes the inside of the iron core 3 is laminated with the electromagnetic mechanical force generated between the coil groups 11 of each phase when a short circuit occurs. It is supported by the iron core 3.

If the end of the coil group 11 above or below the laminated core 3 is simply surrounded by the insulating barrier 5, the electromagnetic mechanical force at the time of short circuit cannot be supported.
As shown in FIG. 11, between the coil groups 11 and between the coil groups 11 and the iron core holder 8 provided in the upper tank 4b so as to withstand the electromagnetic mechanical force in the direction of arrow A generated in the coil groups 11 at the time of short circuit. A spacer 9 made of an insulating material is arranged between the lower portion and the wall of the lower tank 4a, and a wedge 10 is driven into the lower portion to drive an electromagnetic mechanical force generated in the coil group 11 at the time of short-circuit.
Alternatively, it is configured to be supported by the tank wall of the lower tank 4a.

Further, since the inside of the coil group 11 has a temperature rise due to the load current, an insulating medium, which is also a cooling medium, flows so that the temperature rise value can be cooled below a specified value. FIG. 12 shows an example of a cross-sectional configuration of the high-voltage coil 1 of the coil group 11 of the actual shell-type transformer. In the drawing, 12 is an inner edge side connection portion of the high voltage coil unit 1a, 13 is an outer edge side connection portion of the high voltage coil unit 1a, 14 is an insulating member disposed around the inner edge side, 15
Is an insulating member arranged around the outer edge side; 16 is an insulating member between layers arranged between the high voltage coil units 1a;
Is an insulating barrier disposed on the inner edge side where the high voltage coil units 1a are arranged in parallel, 18 is an insulating member disposed on the inner edge of the high voltage coil unit 1a at the end, and 19 is an outer edge of the high voltage coil unit 1a at the end. It is an insulating member arranged in. Reference numeral 20 denotes an electrostatic plate for reducing local electric field concentration on the high voltage side of the high voltage coil unit 1a.

On the surface of the high-voltage coil unit 1a, a carder-like spacer is provided so that the electromagnetic mechanical force at the time of short circuit is supported by the laminated iron core 3 and the wall of the tank 4 and an insulating medium flow path is formed. The attached insulating member 16 is arranged. The high voltage coil units 1a are arranged so as to have a V-shaped cross section so that an insulation distance is secured according to the potential difference between the opposing parts. The coil group 11 includes an insulating member 14 at the inner edge 12 and an insulating member 15 at the outer edge 13 of the high-voltage coil unit 1a,
The insulation strength of each part of the insulation barrier 17 between the inner edge 12 and the iron core 3 is ensured.

An insulating member 18 is provided on the side of the inner edge of the high voltage coil unit 1a of the coil group 11 arranged in parallel.
An insulating member 19 is arranged on the side of the outer edge to ensure the dielectric strength of the high-voltage coil 1 and is mechanically supported by an iron core holder 8 provided in the tank 4.

As described above, the coil group 11 of the shell-type transformer secures the insulating medium flow path, and forms the high-voltage coil unit 1a and the insulating medium flow path so as not to be deformed by the electromagnetic mechanical force at the time of short circuit. The insulating structure around the high voltage coil unit 1a is a structure in which the insulating members and the insulating medium layers are alternately arranged. When a high voltage is applied to the high voltage coil 1, Since the dielectric constant of the insulating medium layer in the insulating medium flow path is smaller than the dielectric constant of the insulating member, and the respective voltage sharing is inversely proportional to the dielectric constant, the electric field strength of the insulating medium layer increases.

The high voltage coil 1 includes a high voltage coil unit 1a
Between the high-voltage coil unit and the adjacent high-voltage coil unit and between the high-voltage coil and the inner surface of the laminated core, so that the electric field strength of the insulating medium layer near the end of the The design is such that the insulation distance is determined.

Therefore, when an insulating member having a high relative dielectric constant exists near the inner edge and the outer edge of the high voltage coil unit 1a where the electric field is concentrated, the electric field strength of the insulating medium layer in that portion increases, and the high voltage coil unit The insulation distance between the high voltage coil unit and the adjacent high voltage coil unit and between the high voltage coil and the inner surface of the laminated core 3 is increased, and the external dimensions of the transformer are increased.

In particular, when the insulating medium is an insulating gas, the relative permittivity is 1 when the insulating medium portion where the insulating member is not disposed is the insulating gas, and the electric field is higher than when the insulating oil has a relative permittivity of 2.2. The strength increases, and the insulation distance needs to be increased.

Although the above description has been given of a shell type transformer,
The armor-type shunt reactor, which is constituted only by the high-voltage coil and is configured to increase the magnetic resistance of the iron core, has the same structure as the armor-type transformer, and has the same structure as the armor-type transformer.

[0016]

As described above, the coil group 11 of the conventional shell-type transformer or shell-type shunt reactor is formed of the insulating medium layer near the inner edge or the outer edge of the high-voltage coil unit 1a. The insulation distance between the high-voltage coil units is set so that the electric field strength is equal to or lower than the electric field strength that the insulating medium can withstand. There was a problem of growing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is configured so that the electric field strength at the inner edge and the outer edge of the high-voltage coil unit is reduced to improve the insulation reliability and to reduce the voltage between the high-voltage coil units. It is an object of the present invention to provide a core-type electromagnetic induction device such as a core-type transformer or a core-type shunt reactor having a reduced external dimension as a configuration capable of reducing the insulation distance of the core.

[0018]

According to a first aspect of the present invention, there is provided a shell-type electromagnetic induction device in which a plurality of high-voltage coil units wound in a rectangular flat plate shape having a window at a central portion are arranged in parallel in a vertical direction. A high-voltage coil arranged and connected in series, an insulating medium flow path is formed, an insulating member disposed on a side surface of the high-voltage coil unit, and a shell-type electromagnetic induction including an iron core laminated on a window portion of the high-voltage coil. In this configuration, the coil conductors of the high-voltage coil unit of the device are bound with each other by a binding material, and a gap is formed on the side of the high-voltage coil unit.

According to a second aspect of the present invention, there is provided a shell-type electromagnetic induction device in which a plurality of high-voltage coil units wound in a rectangular flat plate shape having a window at a central portion are vertically arranged in parallel and connected in series. High-voltage coil, an insulating medium flow path is formed, an insulating member disposed on the side surface of the high-voltage coil unit, and a high-voltage coil unit of a shell-type electromagnetic induction device having an iron core laminated on a window portion of the high-voltage coil. The coil conductors are tightly bound by a binding material, and a gap is formed on each of the inner core portion and the outer edge portion facing the inner surface of the laminated core and on the side of the high-voltage coil unit.

According to a third aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the binding member for tightening the coil conductor of the high voltage coil unit according to the first or second aspect is formed of a high tension tape-shaped insulating material. It was done.

According to a fourth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the inner and outer edges of the high-voltage coil unit according to the first or second aspect are each formed of a thread-shaped binding member having several turns. It is a structure that was tied up.

According to a fifth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein a plurality of turns of the coil conductor of each of the inner edge and the outer edge of the high voltage coil unit according to the first or second aspect is tape-shaped. The structure was tied with wood.

According to a sixth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the binding member for binding the coil conductors of the high-voltage coil unit according to the first to fifth aspects is formed by winding the coil conductor. It is configured to be inserted so as to be folded and sewn from both sides every time.

According to a seventh aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the binding material for binding the coil conductor of the high voltage coil unit according to any one of the first to sixth aspects is a high-tensile aramid fiber. is there.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 In the first embodiment, the electric field strength at the inner edge and the outer edge facing the inner surface of the core laminated on the window portion of the high-voltage coil unit of the core-type electromagnetic induction device such as a core-type transformer or a core-type shunt reactor. To improve the reliability of the core-type electromagnetic induction device, shorten the insulation distance between the high-voltage coil units, and reduce the outer dimensions of the core-type electromagnetic induction device.

The case of a shell-type transformer of an electromagnetic induction device will be described below. FIG. 1 shows an analysis result of the electric field strength near the outer edge of the high-voltage coil unit of the shell-type transformer. FIG.
FIG. 1A shows a state of an electric field distribution in which an insulating member near a high-voltage coil is arranged in a conventional configuration, and FIG.
FIG. 1 shows the electric field strength when an insulating medium portion 29A without an insulating member is provided on the side of the high voltage coil unit.
(C) provides a gap 29B having a rectangular cross-section wider than the coil width on the outer peripheral portion of the outer edge of the high-voltage coil unit, and a gap 29C on a side portion between the high-voltage coil unit and an adjacent high-voltage coil unit. The strength was determined.

In the figure, reference numeral 21 denotes a high-voltage coil unit, a plurality of which are arranged in parallel. FIG.
In FIG. 1, (b) is an insulating member disposed portion, and (c) is an insulating member disposed portion in FIG. 1 (c), which is indicated by hatching in each drawing. 29a
Is an insulating medium portion in FIG. 1A, 29b is an insulating medium portion in FIG. 1B, and 29c is an insulating medium portion in FIG. 1C, which are indicated by a white background in each drawing.

In the conventional configuration shown in FIG. 1A, the periphery of the outer edge of the high-voltage coil unit 21 is densely filled with an insulating member having an insulating medium flow path as described in the section of the prior art. In this state, the insulating medium layer and the insulating member of the insulating medium flow path are formed alternately, and an insulating medium having a high dielectric constant exists near the insulating medium layer at the outer edge of the high-voltage coil unit 21. The electric field intensity at the point P of the insulating medium layer at the outer edge of the unit 21 is the highest, and the electric field intensity at the point P is 100%.

In the case of FIG. 1B, a gap 29A is provided on the side of the high voltage coil unit 21, and the electric field at point P of the insulating medium layer at the outer edge of the high voltage coil unit 21 at which the maximum electric field intensity is obtained. The intensity is 81% of the electric field intensity at point P in FIG. 1A of the conventional configuration.

In the case of FIG. 1C, the high-voltage coil unit 2
1, a gap 29C having a width greater than the width of the high-voltage coil unit 21 and a gap 29C provided between the high-voltage coil 21 arranged in parallel with the high-voltage coil unit 21. The electric field intensity at the point P of the insulating medium layer at the outer edge of the high-voltage coil unit 21 as shown in FIG.
This is 61% of the electric field intensity at point P in FIG. The same electric field intensity can be obtained by making the inner edge of the high-voltage coil unit 21 the same as that shown in FIG.

From the results of the electric field analysis, in the case of FIG. 2B in which a gap is provided on the side of the high voltage coil unit 21, the electric field strength of the insulating medium layer at the outer edge of the high voltage coil unit 21 is 81% of the conventional configuration. , Thus the high voltage coil unit 2
By providing an insulating medium layer on which no insulating member is provided on the side of the first member, the reliability of insulation can be improved. Further, as shown in FIG. 1C, a gap having a width larger than the high-voltage coil width is provided on the outer peripheral portion of the high-voltage coil unit, and a gap is provided on the side of the high-voltage coil unit 21. In this case, the electric field strength of the insulating medium layer at the outer edge of the high-voltage coil unit 21 is reduced to 61%, and the reliability of insulation can be greatly improved.

Based on the analysis results of the electric field strength shown in FIG. 1, the insulation between the high voltage coil units 21 is made such that the electric field strength of the insulating medium layer at the outer edge of the high voltage coil unit 21 becomes almost the same as the electric field strength of the conventional configuration. FIG. 2 shows an analysis result of the electric field intensity when the distance is set to 60% of the conventional case. FIG. 2 (a)
2 shows a configuration of a corresponding portion of the related art, and FIG. 2B is a partial configuration diagram of a high voltage coil portion formed based on the electric field analysis result shown in FIG. In the drawing, reference numeral 21 denotes a conventional high-voltage coil unit, and reference numeral 28a denotes an arrangement portion of the insulating member in FIG. 2A, which is indicated by hatching in the drawing. 29a
Indicates an insulating medium portion in FIG. 2A, which is a white background portion in the drawing.

In FIG. 2B, reference numeral 31 denotes a high-voltage coil unit arranged in parallel, and reference numeral 28b denotes a portion where the insulating member is disposed in FIG. 2B, which is a hatched portion in the drawing. Reference numeral 29b denotes an insulating medium arrangement portion in FIG. 2B, which is a white background portion in the drawing. The configuration shown in FIG. 2B is reduced to about 60% of the insulation distance D between the conventional high-voltage coil unit 21 and the adjacent high-voltage coil unit 21 shown in FIG. An insulating medium portion 29D in which no insulating member is disposed and an insulating medium portion 29E in which no insulating member is disposed are provided between the high-voltage coil unit 31 and the insulating medium portion 29D.

The electric field strength in the case of the configuration shown in FIG. 2B is reduced by the conventional high voltage coil unit 21 shown in FIG.
Assuming that the electric field strength of the insulating medium layer at the outer edge of the high voltage coil unit 31 is 100%, the electric field strength of each part is expressed as a percentage, and the electric field strength of the insulating medium layer at the outer edge of the high voltage coil unit 31 is 90%. Has become. Thus, even if the insulation distance between the high voltage coil units is reduced to 60% of that of the conventional configuration, the electric field strength of the insulating medium layer at the outer edge of the high voltage coil unit 31 becomes about 90%, which is equivalent to or higher than the conventional configuration. Is obtained.

If a gap is provided near the inner edge and the outer edge of the high-voltage coil unit 31 of the shell-type transformer as described above, the dielectric strength is greatly improved, but the electromagnetic machine generated when a short circuit occurs Since the insulating member for supporting the force is not provided, the configuration in which the inner edge and the outer edge of the high-voltage coil unit 31 are simply wound as in the related art cannot withstand the electromagnetic mechanical force at the time of the short circuit, and the coil conductor The transformer can be broken by deformation or buckling, and a practical transformer cannot be constructed.

Therefore, in the core-type transformer of the core-type electromagnetic induction device of the first embodiment, the inner and outer edges of the high-voltage coil unit 31 are not provided with an insulating member for supporting the electromagnetic mechanical force at the time of short-circuit. Are also configured to withstand electromagnetic mechanical force.

FIG. 3 shows a partial configuration of the high-voltage coil according to the first embodiment. The high-voltage coil unit of the shell-type transformer is configured as shown in FIG. 9 shown in the section of the prior art, and FIG. 3 is a diagram showing the outer edge of the portion arranged inside the laminated core of the high-voltage coil unit. It is the partial block diagram which showed a part by cross section.

FIG. 3A is a partial cross-sectional view of the outer edge of the high-voltage coil unit, and FIG. 3B is an explanatory view of a method of binding conductors. In the figure, 41 is a high voltage coil unit,
Wrap an insulating tape around the surface of the rectangular conductor 32a to insulate the conductor.
A plurality of the conductor wires 32 subjected to 2b are arranged in parallel to form a coil conductor 33. The coil conductor 33 is wound into the shape shown in FIG. 9, and a shield 34 for reducing the electric field concentration of the coil conductor 33 is wound around the outer edge. The shield 34 has a structure in which an insulating tape is wound around a shield wire to provide shield insulation. Reference numeral 45 denotes a high-tensile thread-like binding material that binds the coil conductor 33 and the shield 34. As a material having an insulating property to obtain a high tension, for example, 0.5
A material in which aramid reinforcing fibers of about mm are formed in a thread shape is used.

The coil conductor 33 of the high voltage coil unit 41
And the shield 34 are fixed at predetermined intervals over the entire circumference.
This is a configuration in which the unit is integrated by being bound by 5. As shown in FIG. 3 (b), the binding method is as follows.
From the inner edge portion, the binding material 45 is inserted and wound around the coil conductor 33 so as to be sewn back and forth between the coil conductors 33 from right and left every time the winding is performed, and the binding is performed including the outer edge shield 34, and the binding material 45 is unwound. By fixing so as not to be, a structure in which the mechanical strength is enhanced by being integrated as the high voltage coil unit 31 is obtained.

As described above, the coil conductor 33 and the shield 34
When the high-voltage coil unit 41 is wound, it is possible to easily perform the tightening work when the high-voltage coil unit 41 is wound.
The high-voltage coil unit 41 having enhanced mechanical strength has a structure in which a gap is provided on the outer peripheral portion of the outer edge as shown in FIG. A shell-type transformer with reduced external dimensions that can withstand the force can be configured.

Embodiment 2 In the second embodiment, as shown in FIG. 4, a tape-shaped binding member for the coil conductor of the high-voltage coil unit in the configuration of the shell-type transformer of the first embodiment is used. FIG. 4A is a configuration diagram of a high-voltage coil unit in which a part of an outer edge of the high-voltage coil unit is shown in cross section, and FIG. 4B is a diagram of one of the binding members for binding the coil conductor of the high-voltage coil unit. FIG. 4C is a diagram illustrating an insertion direction, and FIG. 4C is a diagram illustrating an insertion direction of another binding material. In the drawing, a coil conductor 33 and a shield 34 are the same as those in the configuration of FIG. 3 of the first embodiment, 51 is a high-voltage coil unit, and 55a and 55b are insulating high tension members that bind the coil conductor 33 and the shield 34. It is a tape-shaped binding material. As the binding material, a material in which a high-tensile aramid fiber is formed in a tape shape is used.

In this configuration, the binding members 55a and 55b are in a tape shape, and the binding positions are shifted from both the left and right sides so that the binding members 55a and 55b are folded and sewn between the coil conductors 33 for each winding, and are bound from the left side. The material 55a is alternately folded back from the right with the binding members 55b, and the winding start portion and the winding end portion are fixed with an adhesive or the like and bound to form an integrated high voltage coil unit 51.

When the high-voltage coil unit is made of a tape-shaped binding material, the tension of the binding material can be increased, so that the number of places to be bound can be smaller than in the case of a thread-shaped binding material, and the high-voltage coil unit 51 can be manufactured in a short working time. it can.

The high-voltage coil unit 51 integrated in this manner is assembled into a shell-type transformer in the same manner as in the first embodiment, and short-circuiting can be performed without disposing an insulating member near the outer edge of the high-voltage coil unit 51. The electric field strength of the insulating medium layers at the inner edge and the outer edge that withstands the electromagnetic mechanical force at the time is alleviated, so that a shell-type transformer with high insulation reliability and reduced size can be obtained.

Embodiment 3 In the third embodiment, the binding position of the coil conductor is limited to a portion where the insulating member is not arranged, and the coil conductor is bound by a thread-like binding material. FIG. 5 is a view showing a range in which the coil conductors of the high-voltage coil unit are tightened, 61 indicates a high-voltage coil unit, and 66 indicates a range in which the coil conductors are tightened. Are limited to the inner edge and the outer edge. FIG. 6 is a partial configuration diagram showing a part of an outer edge of the high-voltage coil unit 61 in a cross section. In the figure, a coil conductor 33 and a shield 34 are the same as those in FIG. 65 is a thread-like binding material.

The binding range 66 shown in FIG. 5 of several turns of the inner edge and the outer edge of the high-voltage coil unit 61 is defined as the binding range, and is performed at predetermined intervals at several turns of the inner edge at the beginning of winding of the high-voltage coil unit 61. As in the case of the first embodiment, each time the coil conductor 32 is wound, the thread-like binding material 65 is folded from the left and right and inserted so as to be sewn together, and fixed at the position of the binding range 66 in FIG. . Further, the winding is continued, and a thread-like binding material 65 is again folded and inserted between the coil conductors 33 from the left and right at the position of the outer edge portion in the range 66 shown in FIG. And so that there is no rewind.

By limiting the range in which the high-voltage coil unit 61 is tightened, the winding operation time of the high-voltage coil unit 61 is shorter than in the second embodiment, and the manufacturing cost of the high-voltage coil unit 61 is reduced. .

In the high voltage coil unit 61 integrated as described above, as in the first and second embodiments, by assembling as a shell-type transformer, even if an insulating member is not arranged on the outer edge, a short circuit at the time of short circuit can be achieved. A highly reliable outer-core-type transformer with reduced external dimensions in which the electric field strength at the inner and outer edges that withstands the electromagnetic mechanical force is reduced.

Embodiment 4 Embodiment 4 is a configuration in which the binding material of the high-voltage coil unit is tape-shaped and limited to necessary portions of the inner edge and the outer edge of the high-voltage coil unit. FIG. 7 shows the configuration of the high-voltage coil unit. FIG. 7A is a configuration diagram of the high-voltage coil unit in which a part of the outer edge of the high-voltage coil unit is shown in cross section. FIG.
FIG. 7B is a view showing a method of inserting one of the binding members for binding the coil conductor of the high-voltage coil unit, and FIG.
(C) is a figure which shows the insertion situation of the other one binding material.
In the figure, a coil conductor 33 and a shield 34 are the same as those in FIG. 4, and 71 is a high-voltage coil unit, 75a,
Reference numeral 75b is a binding member formed in a tape shape having a high tension and an insulating property for binding the coil conductor 33 and the shield 34.

In this configuration, similarly to the second embodiment, the binding members 75a and 75b are tape-shaped, and the binding position is limited to the binding range 66 shown in FIG. After a few turns, the binding material is fixed with an adhesive or the like so as not to rewind in the same manner as in the second embodiment, and the winding is further continued. It is inserted and tightened in the same manner as in the second embodiment, and an integrated structure is formed by bonding and fixing with an adhesive or the like including the outer edge shield.

Also in this configuration, the tape-shaped binding member can take a high tension of the binding member, so that the number of locations to be bound can be smaller than in the case of a thread-shaped binding material. The working time for creating the unit 71 is further reduced, and the unit 71 can be configured at a low cost.

The high voltage coil unit 71 thus integrated is assembled into a transformer in the same manner as in the first to third embodiments, and an insulating member is provided on the inner surface side of the laminated core at the outer edge of the high voltage coil unit 71. A shell-type transformer with reduced external dimensions, which withstands the electromagnetic mechanical force at the time of a short circuit, reduces the electric field strength of the insulating medium layers at the inner and outer edges, even if it is provided with an unfilled part. Is obtained.

[0053]

According to the first aspect of the present invention, there is provided a core-type electromagnetic induction device, wherein a gap is provided between each of the inner edge and the outer edge of the coil unit forming the high voltage coil, which faces the inner surface of the laminated core. With the configuration provided, the electric field strength of the insulating medium layer at the inner edge portion and the outer edge portion facing the inner surface of the laminated core of the high voltage coil unit is reduced, and the insulation distance between the high voltage coil units is shortened. The size of the transformer can be reduced.

According to a second aspect of the present invention, there is provided a core-type electromagnetic induction device, wherein an inner edge portion and an outer edge portion facing the inner surface of the laminated core of the coil unit forming the high-voltage coil have respective iron core sides and the high-voltage coil unit. Since the gaps are provided between each other, the electric field strength of the insulating medium layers at the inner edge and the outer edge facing the inner surface of the laminated core of the high voltage coil unit is further reduced, and the high voltage coil unit and the low voltage By further shortening the insulation distance between the coil unit and the coil unit, it is possible to greatly reduce the size of the transformer.

According to a third aspect of the present invention, in the shell-type electromagnetic induction device, the binding member for binding the coil conductor of the high voltage coil unit according to the first or second aspect is formed of a high-tensile tape-shaped insulating material. Therefore, the number of binding positions can be reduced as compared with the case of a thread-like binding material.

According to a fourth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the high-voltage coil unit according to the first or second aspect has a thread-shaped binding member formed by winding several turns of the coil conductor at each of the inner edge and the outer edge. In this case, the winding operation time of the high-voltage coil is shortened, and the strength required for the high-voltage coil unit is sufficiently obtained.

According to a fifth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein a plurality of turns of the coil conductor of each of the inner edge and the outer edge of the high voltage coil unit according to the first or second aspect are tape-shaped. Since the structure was tied with wood,
The required strength of the high-voltage coil can be obtained with few tightening points.

According to a sixth aspect of the present invention, there is provided a shell-type electromagnetic induction device, wherein the binding member for binding the coil conductors of the high voltage coil unit according to any one of the first to fifth aspects is formed by winding the coil conductor. Since the method is alternately folded from both sides and inserted and sewn each time, the workability of tying is good, and the tying force of the coil conductor can be increased.

In the core-type electromagnetic induction device according to claim 7 of the present invention, the binding material for binding the coil conductor of the high-voltage coil unit according to any one of claims 1 to 6 is a high-tensile aramid fiber. The required insulation is obtained, and the binding strength is also sufficiently obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an electric field analysis result of an edge of a high voltage coil unit according to the present invention.

FIG. 2 is a diagram showing an electric field analysis result when the insulation distance of the high voltage coil unit is shortened based on the electric field analysis result of FIG.

FIG. 3 is a diagram illustrating a method of binding the high-voltage coil unit according to the first embodiment.

FIG. 4 is a diagram illustrating a method of binding a high-voltage coil unit according to a second embodiment.

FIG. 5 is a view showing a range in which the high-voltage coil unit is tightened.

FIG. 6 is a diagram illustrating a method of binding a high-voltage coil unit according to a third embodiment.

FIG. 7 is a diagram illustrating a method of binding a high-voltage coil unit according to a fourth embodiment.

FIG. 8 is a perspective view showing a configuration of a shell-type transformer.

FIG. 9 is a configuration diagram of a high-voltage coil unit.

FIG. 10 is a partial sectional view of a high-voltage coil unit.

FIG. 11 is a diagram showing a method of mechanical force when a core-type transformer is short-circuited.

FIG. 12 is a cross-sectional view of a high-voltage coil of a conventional shell-type transformer.

[Explanation of symbols]

21 high-voltage coil unit, 28 insulating member arrangement part,
29 Insulation medium part, 31 High voltage coil unit, 33
Coil conductor, 34 shield, 38 insulating member arrangement part, 39 insulating medium part, 41 high voltage coil unit,
45 binding material, 51 high-voltage coil unit, 55a, 5
5b binding material, 61 high-voltage coil unit, 65 binding material, 66 range to be bound, 71 high-voltage coil unit,
75a, 75b Binding material.

Claims (7)

[Claims] A high-voltage coil in which a plurality of high-voltage coil units in which an insulated coil conductor having a rectangular cross section is wound in the shape of a rectangular flat plate having a window at the center is arranged in parallel in a vertical direction and connected in series, In a shell-type electromagnetic induction device having a medium flow path formed therein and an insulating member disposed on a side surface of the high-voltage coil unit and an iron core laminated on a window portion of the high-voltage coil, the coil conductor of the high-voltage coil unit Characterized in that gaps are formed between the inner edge and the outer edge of the high-voltage coil unit facing the inner surface of the laminated iron core, respectively. . 2. A high-voltage coil in which a plurality of high-voltage coil units in which an insulated coil conductor having a rectangular cross section is wound in the shape of a rectangular flat plate having a window at a central portion are arranged in parallel in a vertical direction and connected in series. In a shell-type electromagnetic induction device having a medium flow path formed therein and an insulating member disposed on a side surface of the high-voltage coil unit and an iron core laminated on a window portion of the high-voltage coil, the coil conductor of the high-voltage coil unit Characterized in that a gap is formed between each of the inner and outer edges of the high-voltage coil unit facing the inner surface of the laminated iron core, and a gap is formed between each of the iron cores and the side thereof. Type electromagnetic induction equipment. 3. A core-type electromagnetic induction device according to claim 1, wherein the binding member for binding between the coil conductors of the high-voltage coil unit is a high-tensile tape-shaped insulating material. . 4. The outer iron-type electromagnetic induction device according to claim 1, wherein the coil conductor of several turns at each of the inner edge portion and the outer edge portion of the high-voltage coil unit is bound by a string-shaped binding member. 5. A shell-type electromagnetic induction device according to claim 1, wherein the coil conductor of several turns at each of the inner edge and the outer edge of the high-voltage coil unit is bound by a tape-shaped binding member. . 6. The high-voltage coil unit according to claim 1, wherein the binding member for binding between the coil conductors is inserted and sewn from both sides so as to be folded and stitched each time the coil conductor is wound. 5. The shell-type electromagnetic induction device according to any one of 5. 7. The outer iron-type electromagnetic induction device according to claim 1, wherein the binding member for binding the conductor strand of the high-voltage coil unit is a high-tensile aramid fiber.