WO2023166687A1 - Capacitor voltage-dividing type transformer and voltage transformation apparatus - Google Patents

Capacitor voltage-dividing type transformer and voltage transformation apparatus Download PDF

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Publication number
WO2023166687A1
WO2023166687A1 PCT/JP2022/009296 JP2022009296W WO2023166687A1 WO 2023166687 A1 WO2023166687 A1 WO 2023166687A1 JP 2022009296 W JP2022009296 W JP 2022009296W WO 2023166687 A1 WO2023166687 A1 WO 2023166687A1
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Prior art keywords
voltage
main circuit
intermediate electrode
transformer
capacitor
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PCT/JP2022/009296
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French (fr)
Japanese (ja)
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達也 影山
大輝 大脇
大輔 澁谷
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日新電機株式会社
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Priority to PCT/JP2022/009296 priority Critical patent/WO2023166687A1/en
Publication of WO2023166687A1 publication Critical patent/WO2023166687A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/24—Voltage transformers

Definitions

  • the present invention relates to a capacitor voltage dividing transformer and a voltage transformation device including the capacitor voltage dividing transformer.
  • Patent Document 1 discloses a capacitor voltage dividing transformer that divides and outputs the main circuit voltage according to a predetermined transformation ratio.
  • a capacitor voltage dividing transformer that divides and outputs the main circuit voltage according to a predetermined transformation ratio.
  • a high voltage side capacitor including the main circuit conductor and the voltage dividing electrode and a low voltage side capacitor including the voltage dividing electrode and the ground are formed between the main circuit conductor and the ground. .
  • the voltage of the main circuit conductor is divided by each capacitor and output.
  • An object of one aspect of the present invention is to realize a capacitor voltage dividing transformer or the like in which the low-voltage side capacitance can be easily adjusted during manufacturing.
  • a capacitor voltage dividing transformer includes a main circuit conductor to which a high voltage is applied and which extends in the axial direction; At least one of an insulator cylinder having a cylindrical shape arranged coaxially with a circuit conductor, an intermediate electrode covering at least a part of an outer side of the insulator cylinder, an insulating film covering the intermediate electrode, and the insulating film. and a ground electrode covering the portion.
  • FIG. 4 is a circuit diagram showing an example of voltage transformation by the voltage transformation device according to Embodiment 1;
  • FIG. 1 is a cross-sectional view showing the configuration of a voltage transformer according to Embodiment 1;
  • FIG. 1 is a diagram showing the configuration of a main part of a capacitor voltage dividing transformer according to Embodiment 1;
  • FIG. 10 is a diagram showing the configuration of a main part of a voltage transformer according to Embodiment 2;
  • FIG. 10 is a diagram showing the configuration of the main part of the voltage transformer according to Embodiment 3;
  • FIG. 1 is a circuit diagram showing an example of voltage transformation by a voltage transformation device 1.
  • the voltage transformer 1 comprises capacitors 111 and 112 connected in series with each other.
  • the capacitance of the capacitor 111 on the high voltage side is C1.
  • the capacitance of capacitor 112 on the low voltage side is C2.
  • the opposite side of the capacitor 111 to the capacitor 112 is connected to the AC power supply 120 .
  • the opposite side of the capacitor 112 to the capacitor 111 is grounded.
  • a resistor 130 is connected in parallel with the capacitor 112 .
  • the resistance value of resistor 130 is R.
  • a voltage V1 is applied to the voltage transformer 1 by the AC power supply 120 .
  • Voltage V1 is divided by capacitor 111, capacitor 112 and resistor 130 according to capacitances C1 and C2 and resistance value R, respectively.
  • the voltage V2 applied to resistor 130 is equal to the divided voltage applied to capacitor 112 .
  • the voltage V1 is transformed into the voltage V2.
  • FIG. 2 is a cross-sectional view showing the configuration of the voltage transformer 1.
  • the voltage transformer 1 includes a capacitor voltage dividing transformer 10 and a container 20 that accommodates the capacitor voltage dividing transformer 10 .
  • the voltage transformer 1 comprises one capacitor voltage dividing transformer 10 .
  • the number of capacitor voltage dividing transformers 10 included in the voltage transformer 1 is not limited to this.
  • the interior of container 20 is filled with a liquid or gas insulator.
  • the container 20 has, for example, a structure that can be divided into two.
  • the two divided containers 20 may be combined so as to cover the capacitor voltage dividing transformer 10 .
  • FIG. 3 is a diagram showing the configuration of the main part of the capacitor voltage dividing transformer 10. As shown in FIG. FIG. 3 also shows the container 20 .
  • reference numeral 301 is a cross-sectional view of the voltage transformer 1 taken along a plane perpendicular to the axial direction of the main circuit conductor 11 .
  • Reference numeral 302 is a sectional view taken along the line AA in the sectional view indicated by reference numeral 301.
  • the capacitor voltage dividing transformer 10 comprises a main circuit conductor 11, an insulator cylinder 12, an intermediate electrode 13, an insulating film 14, and a ground electrode 15.
  • Capacitor voltage divider transformer 10 also includes wiring (not shown) electrically connected to each of main circuit conductor 11 , intermediate electrode 13 , and ground electrode 15 .
  • the main circuit conductor 11 is a conductor connected to an AC power supply 120 (see FIG. 1) and to which a high voltage is applied.
  • the main circuit conductor 11 has a shape extending in the axial direction.
  • the main circuit conductor 11 has, for example, a cylindrical shape or a columnar shape.
  • the axial direction of the main circuit conductor 11 is defined as the X-axis direction, and two directions perpendicular to the X-axis direction and perpendicular to each other are defined as the Y-axis direction and the Z-axis direction.
  • any known conductor can be used without particular limitation.
  • the main circuit conductor 11 is fixed relative to the container 20 .
  • the insulator cylinder 12 is a structure having a cylindrical shape.
  • the insulator cylinder 12 is arranged coaxially with the main circuit conductor 11 .
  • the insulator forming the insulator cylinder 12 is, for example, epoxy resin.
  • the intermediate electrode 13 covers at least part of the outside of the insulator cylinder 12 .
  • the intermediate electrode 13 is a metal foil wrapped around the insulator cylinder 12 .
  • An example of the material of the metal foil that forms the intermediate electrode 13 is copper.
  • Main circuit conductor 11, insulator cylinder 12 and intermediate electrode 13 constitute capacitor 111 shown in FIG.
  • the insulating film 14 covers the intermediate electrode 13 .
  • the insulating film 14 is an insulating film wrapped around the intermediate electrode 13 so as to cover the outside thereof. Examples of insulators include polyester.
  • the insulating film 14 electrically insulates the intermediate electrode 13 and the ground electrode 15 .
  • the ground electrode 15 covers at least part of the insulating film 14 .
  • the ground electrode 15 is a metal foil wrapped around the outside of the insulating film 14 .
  • An example of the material of the metal foil forming the ground electrode 15 is copper, like the material of the metal foil forming the intermediate electrode 13 .
  • Intermediate electrode 13, insulating film 14 and ground electrode 15 constitute capacitor 112 shown in FIG.
  • the voltage transformer 1 further includes a mounting plate 21 .
  • the mounting plate 21 is a structure for fixing the insulator cylinder 12 to the container 20 .
  • the mounting plates 21 are positioned at both ends of the insulator cylinder 12 in the axial direction of the main circuit conductor 11 when the insulator cylinder 12 is coaxially attached to the main circuit conductor 11 .
  • the material of the mounting plate 21 is not particularly limited as long as it has rigidity, and may be aluminum or epoxy resin, for example.
  • the mounting plate 21 may be formed integrally with the insulator cylinder 12 .
  • the insulator cylinder 12 is fixed to the container 20 by attaching the mounting plate 21 to the container 20 . Thereby, the capacitor voltage dividing transformer 10 can be fixed to the container 20 without being brought into direct contact with the container 20 .
  • the mounting plate 21 has a flat plate shape extending in the radial direction.
  • the container 20 has two axial contact portions 20a that contact the mounting plate 21 from the outer side of the main circuit conductor 11 in the axial direction.
  • the outer side in the axial direction refers to the opposite side of each mounting plate 21 from the other mounting plate 21 in the axial direction.
  • the mounting plate 21 can be attached to the container 20 in a state where the position of the mounting plate 21 in the axial direction is fixed by sandwiching the mounting plate 21 between the two axial contact portions 20a.
  • the container 20 further has radial contact portions 20b that contact the mounting plate 21 from the outside in the radial direction at two locations in the axial direction.
  • the radial contact portion 20b is provided, for example, over the entire circumferential direction at a position corresponding to the position of the mounting plate 21 in the axial direction.
  • the radial contact portion 20b contacts the mounting plate 21 from the outside in the radial direction, so that the mounting plate 21 can be attached to the container 20 while the position of the mounting plate 21 in the radial direction is fixed.
  • the radial contact portion 20b does not necessarily have to be provided over the entire circumferential direction.
  • the position, number and size of the radial contact portions 20b may be appropriately determined so that the position of the mounting plate 21 in the radial direction can be fixed.
  • the structure for attaching the mounting plate 21 to the container 20 is not limited to the above example.
  • the container 20 may have portions that contact the two mounting plates 21 from the inner side or the outer side in the axial direction.
  • the voltage transformer 1 further includes a shield 22 .
  • the shield 22 reduces the electric field between the insulator cylinder 12 and the region of the main circuit conductor 11 not facing the insulator cylinder 12 .
  • any known material capable of alleviating an electric field can be used without particular limitation.
  • the shield 22 is arranged outside the two mounting plates 21 in the axial direction of the main circuit conductor 11 .
  • the electric field between the region of the main circuit conductor 11 not facing the insulator cylinder 12 and the insulator cylinder 12 increases the capacitance of the capacitor 111 . Therefore, an error occurs in the capacitance of the capacitor 111 due to the electric field. As a result, an error occurs in the capacitance ratio of the capacitors 111 and 112 and also in the voltage division of the capacitor 112 . By alleviating the electric field with the shield 22, the voltage division error of the capacitor 112 can be reduced.
  • the shield 22 is not essential in the voltage transformer 1 and may be omitted.
  • a method of manufacturing the voltage transformer 1 is as follows. First, the insulator cylinder 12 is formed.
  • the intermediate electrode 13 is formed by cutting a metal foil, which is the material of the intermediate electrode 13 , into a width equal to the length of the intermediate electrode 13 in the axial direction and winding it around the insulator cylinder 12 .
  • the insulating film 14 is formed on the intermediate electrode 13 by cutting an insulating film, which is the material of the insulating film 14, into a width equal to the length of the insulating film 14 in the axial direction and winding it.
  • the ground electrode 15 is formed by cutting a metal foil, which is the material of the ground electrode 15, into a width equal to the length of the ground electrode 15 in the axial direction and winding it on the insulating film 14.
  • a mounting plate 21 and a shield 22 are attached to the insulator cylinder 12 .
  • a main circuit conductor is inserted into the insulator cylinder 12 .
  • the mounting plate 21 attached to the insulator cylinder 12 and the main circuit conductor 11 are each fixed to the container 20 .
  • the container 20 is filled with a liquid or gas insulator.
  • the voltage transformer 1 is manufactured by the above steps.
  • the intermediate electrode 13, the insulating film 14, and the ground electrode 15 are formed on the insulator cylinder 12 without using casting or the like. Therefore, the design specifications of the intermediate electrode 13, the insulating film 14, and the ground electrode 15 can be easily changed. For example, in the capacitor voltage dividing transformer 10, the material (dielectric constant) and thickness of the insulator forming the insulating film 14, and/or the number of films can be arbitrarily changed according to the required performance. Therefore, the capacitance of the capacitor 112 can be easily adjusted when the capacitor voltage dividing transformer 10 is manufactured.
  • the metal foil forming the intermediate electrode 13 and the ground electrode 15 is preferably manufactured by an electrolytic method or a rolling method.
  • metal foils produced by electrolysis or rolling have less residual stress than metal foils produced by other methods. Therefore, even if the residual stress changes due to the passage of time after manufacturing the metal foil or environmental changes such as temperature changes, the change in the shape of the metal foil is small. Therefore, the change in shape of the intermediate electrode 13 and the ground electrode 15 formed of the metal foil is small. That is, fluctuations in the capacitance of the capacitors 111 and 112 due to passage of time or environmental changes such as temperature changes are reduced. Therefore, errors in voltage transformation by the voltage transformer 1 caused by variations in the capacitance ratio of the capacitors 111 and 112 are reduced.
  • the intermediate electrode 13 and the ground electrode 15 from metal foil, the weight can be reduced as compared with the case of forming by deforming and welding a metal plate, for example.
  • the metal foil which is the material of the intermediate electrode 13 and the ground electrode 15, may be heat-treated before manufacturing the voltage transformer 1, the metal foil, which is the material of the intermediate electrode 13 and the ground electrode 15, may be heat-treated. By performing the heat treatment, the residual stress of the metal foil is further reduced. Forming the intermediate electrode 13 and the ground electrode 15 from such a metal foil further reduces changes in the shape of the intermediate electrode 13 and the ground electrode 15 due to the passage of time or environmental changes such as temperature changes. That is, the fluctuations in the capacitance of the capacitors 111 and 112 due to passage of time or environmental changes such as temperature changes are further reduced. Therefore, errors in the voltage transformation by the voltage transformer 1 caused by variations in the capacitance ratio of the capacitors 111 and 112 are further reduced.
  • the length of the ground electrode 15 in the axial direction of the main circuit conductor 11 is preferably longer than the length of the intermediate electrode 13 in the axial direction.
  • Such a ground electrode 15 functions as a shield electrode that mitigates the electric field on the intermediate electrode 13 and contributes to the equalization of the electric field between the main circuit conductor 11 and the intermediate electrode 13 .
  • the ground electrode 15 suppresses an electric field to the end of the intermediate electrode 13 and an electric field to the surface of the intermediate electrode 13 on the insulating film 14 side. This can reduce the amount of change in the capacitance C1 of the capacitor 111 when the temperature of a part or the whole of the capacitor voltage dividing transformer 10 changes and the intermediate electrode 13 deforms due to the temperature change.
  • the temperature of a part or the whole of the capacitor voltage dividing transformer 10 may change due to changes in the ambient temperature after the voltage transformer 1 is manufactured or during use, or due to current flowing through the main circuit conductor 11 . Heat generation of the conductor 11 or heat generation of peripheral devices can be mentioned. At the same time, the calculation accuracy of the capacitance C1 when designing the capacitor voltage dividing transformer 10 is also improved.
  • the metal forming the intermediate electrode 13 Since the metal forming the intermediate electrode 13 has a positive coefficient of thermal expansion, it expands as the temperature rises. As a result, the surface area of the intermediate electrode 13 increases with increasing temperature.
  • the dielectric constant of the insulator forming the insulator cylinder 12 may decrease or increase as the temperature rises, depending on the type of insulator. When the temperature drops, the surface area of the intermediate electrode 13 and the dielectric constant of the insulator forming the insulator cylinder 12 change opposite to when the temperature rises.
  • the intermediate electrode 13 and the insulator cylinder 12 will not be affected by the temperature fluctuations of the capacitor 111. They act to change the capacitance in opposite directions. Therefore, the variation of the capacitance with respect to the temperature variation of the capacitor 111 is determined by the balance between the influence of the variation of the surface area of the intermediate electrode 13 and the variation of the dielectric constant of the insulator forming the insulator cylinder 12. .
  • the material of the insulator cylinder 12 is selected so that the influence of variations in the surface area of the intermediate electrode 13 and the influence of variations in the dielectric constant of the insulator forming the insulator cylinder 12 cancel each other out with respect to temperature changes. It is preferable to select according to the material of the electrode 13 . By selecting the material of the insulator cylinder 12 in this way, the capacitance of the capacitor 111 can be made substantially constant with respect to the temperature fluctuation of the capacitor 111 .
  • the capacitor voltage dividing transformer 10 by changing the size of the insulator cylinder 12 in the radial direction, the insulation distance from the main circuit conductor 11 can be secured. Therefore, the applicable voltage class of the capacitor voltage dividing transformer 10 can be easily expanded.
  • the size of the insulator cylinder 12 in the axial direction of the main circuit conductor 11 is enlarged, and the intermediate electrode 13, the insulating film 14, and the ground electrode 15 are added. can easily be increased in number of capacitor voltage divider transformers 10 that share . If the voltage transformer device 1 comprises a plurality of capacitive divider transformers 10 axially adjacent to the main circuit conductors 11, the capacitive divider transformers 10 share a single main circuit conductor 11. . Further, in the voltage transformer 1, by changing the length of the intermediate electrode 13 in the axial direction of the main circuit conductor 11, the voltage division ratio can be easily adjusted.
  • FIG. 4 is a diagram showing the configuration of the main part of the voltage transformer 2 according to Embodiment 2. As shown in FIG. FIG. 4 shows a capacitor voltage dividing transformer 10A and a container 20 included in the voltage transformer 2. As shown in FIG. 4 , reference numeral 401 is a cross-sectional view of the voltage transformer 2 taken along a plane perpendicular to the axial direction of the main circuit conductor 11 . Reference numeral 402 is a cross-sectional view taken along the line BB in the cross-sectional view indicated by reference numeral 401. FIG.
  • the voltage transforming device 2 differs from the voltage transforming device 1 in that it includes a capacitor voltage dividing transformer 10A instead of the capacitor voltage dividing transformer 10.
  • the capacitor voltage dividing transformer 10A differs from the capacitor voltage dividing transformer 10 in that an intermediate electrode 23 is provided instead of the intermediate electrode 13 .
  • the capacitor voltage dividing transformer 10A includes a main circuit conductor 11, an insulator cylinder 12, an insulating film 14, and a ground electrode 15, similar to the capacitor voltage dividing transformer 10.
  • the insulator cylinder 12, the insulator film 14 and the ground electrode 15 are omitted in order to make the shape of the intermediate electrode 23 easier to see.
  • the voltage transformer 2 also includes a mounting plate 21 and a shield 22, similar to the voltage transformer 1. As shown in FIG. The mounting plate 21 and the shield 22 are also omitted in FIG.
  • the length of the intermediate electrode 23 in the circumferential direction of the main circuit conductor 11 is shorter than the length of the insulator cylinder 12 in the circumferential direction of the main circuit conductor 11 . Therefore, as shown in FIG. 4, a gap 23a is formed between one end and the other end of the intermediate electrode 23 in the circumferential direction of the main circuit conductor 11 . Since the gap 23 a is formed in the intermediate electrode 23 , a current that circulates around the main circuit conductor 11 in the circumferential direction does not flow in the intermediate electrode 23 . Therefore, in the voltage transformer 2, the induced current and the induced electromotive force generated in the intermediate electrode 23 when a voltage is applied to the main circuit conductor 11 are reduced.
  • the width of the gap 23a may be appropriately determined so that the induced current and the induced electromotive force are sufficiently small, and may be, for example, 1 mm or more and 3 mm or less.
  • the voltage in the capacitor 112 fluctuates. Due to this variation, the voltage V2 transformed by the voltage transformer 2 also varies. That is, it causes an error in voltage transformation by the voltage transformation device 2 . By reducing the induced electromotive force, the voltage transformation error in the voltage transformer 2 is reduced.
  • the method of manufacturing the voltage transformer 2 differs from the method of manufacturing the voltage transformer 1 only in the process of forming the intermediate electrode 23 .
  • the metal foil, which is the material of the intermediate electrode 23 is cut shorter than the length of the insulator cylinder 12 in the circumferential direction of the main circuit conductor 11 by the width of the gap 23a. It wraps around the insulator cylinder 12 on top.
  • the capacitor voltage dividing transformer 10A includes the insulator cylinder 12, the insulator film 14, and the ground electrode 15.
  • the shape of the insulator cylinder 12, the insulating film 14, and the ground electrode 15 may be as described in the first embodiment. That is, these components need not have shapes corresponding to the intermediate electrode 23 .
  • the shape of the intermediate electrode 23 is not necessarily limited to one in which the gap 23a is formed.
  • the intermediate electrode 23 need not include a closed loop that circulates in the circumferential direction of the main circuit conductor 11 .
  • the intermediate electrode 23 may have a structure in which one end side and the other end side in the circumferential direction of the axis of the main circuit conductor 11 are separated from each other in the radial direction of the main circuit conductor 11 . Even if the intermediate electrode 23 has such a shape, the induced current and induced electromotive force generated in the intermediate electrode 23 when a high voltage is applied to the main circuit conductor 11 are reduced. Therefore, the voltage transformation error in the voltage transformer 2 is reduced.
  • FIG. 5 is a diagram showing the configuration of the main part of the voltage transformer 3 according to Embodiment 3. As shown in FIG. FIG. 5 shows a capacitor voltage dividing transformer 10 and a container 20 included in the voltage transformer 3. As shown in FIG. 5 , reference numeral 501 is a cross-sectional view of the voltage transformer 3 in a plane perpendicular to the axial direction of the main circuit conductor 11 . Reference numeral 502 is a sectional view taken along line CC of the sectional view indicated by reference numeral 501. FIG.
  • the voltage transformer 3 is a voltage transformer that can handle three-phase AC power.
  • the voltage transformer 3 differs from the voltage transformer 1 in that it comprises three capacitive divider transformers 10 whose main circuit conductors 11 are separate from each other.
  • a container 20 houses three capacitor voltage divider transformers 10 .
  • the voltage transformer device 3 may comprise a common mounting plate 21 corresponding to the three insulator cylinders 12 of the three capacitive voltage divider transformers 10 .
  • the three capacitor voltage dividing transformers 10 respectively correspond to three-phase AC power.
  • Such a voltage transformer 3 also has the same effects as the voltage transformer 1 .
  • a capacitor voltage dividing transformer comprises an axially extending main circuit conductor to which a high voltage is applied; an insulator cylinder having a cylindrical shape; an intermediate electrode covering at least a portion of the outside of the insulator cylinder; an insulating film covering the intermediate electrode; and a ground electrode covering at least a portion of the insulating film.
  • the low-voltage side capacitance can be easily adjusted when manufacturing the capacitor voltage dividing transformer.
  • the intermediate electrode does not include a closed loop that circulates in the circumferential direction of the main circuit conductor.
  • the length of the intermediate electrode in the circumferential direction is shorter than the length of the insulator cylinder in the circumferential direction.
  • a gap is formed in a part of the intermediate electrode in the circumferential direction of the main circuit conductor. Therefore, the current that circulates around the main circuit conductor in the circumferential direction does not flow.
  • the length of the ground electrode in the axial direction is longer than the length of the intermediate electrode in the axial direction.
  • the ground electrode suppresses the electric field to the end of the intermediate electrode and the electric field to the insulating film side surface of the intermediate electrode. Therefore, it is possible to reduce the amount of change in capacitance of the high-voltage side capacitor when the intermediate electrode is deformed due to temperature change. Furthermore, the calculation accuracy of the capacitance of the high-voltage side capacitor is improved when designing the capacitor voltage dividing transformer.
  • a voltage transformer according to aspect 5 of the present invention includes the capacitor voltage dividing transformer according to any one of the above aspects, and a container housing the capacitor voltage dividing transformer.
  • a voltage transformation device comprises three capacitor voltage dividing transformers in which the main circuit conductors are separate from each other, and the container houses the three capacitor voltage dividing transformers. good too.
  • the voltage transformer according to aspect 7 of the present invention further includes mounting plates fixed to both ends of the insulator cylinder in the axial direction, and the insulator cylinder is attached to the container by attaching the mounting plates to the container. is preferably fixed to
  • the capacitor voltage dividing transformer can be fixed to the container without direct contact with the container.
  • the present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.
  • Reference Signs List 1 2, 3 voltage transformer 10, 10A capacitor voltage dividing transformer 11 main circuit conductor 12 insulator cylinder 13, 23 intermediate electrode 14 insulating film 15 ground electrode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

Provided is a capacitor voltage-dividing type transformer which can easily adjust low-voltage side capacitance. A capacitor voltage dividing type transformer (10) comprises: a main circuit conductor (11) to which a high voltage is applied and which extends in the axial direction; an insulator cylinder (12) which has a cylindrical shape and is disposed coaxially with the main circuit conductor at the outside of the main circuit conductor; an intermediate electrode (13) that covers at least a part of the outside of the insulator cylinder; an insulating film (14) that covers the intermediate electrode; and a grounding electrode (15) that covers at least a part of the insulating film.

Description

コンデンサ分圧形変成器および電圧変成装置Capacitor voltage divider transformer and voltage transformer
　本発明は、コンデンサ分圧形変成器、および当該コンデンサ分圧形変成器を備える電圧変成装置に関する。 The present invention relates to a capacitor voltage dividing transformer and a voltage transformation device including the capacitor voltage dividing transformer.
　特許文献１には、主回路電圧を所定の変圧比に応じ分圧して出力するコンデンサ分圧形変成器が開示されている。当該コンデンサ分圧形変成器においては、主回路導体と大地との間に、主回路導体及び分圧電極を含む高圧側コンデンサと、分圧電極及び大地を含む低圧側コンデンサとが形成されている。主回路導体の電圧が、各コンデンサにより分圧されて出力される。 Patent Document 1 discloses a capacitor voltage dividing transformer that divides and outputs the main circuit voltage according to a predetermined transformation ratio. In the capacitor voltage dividing transformer, a high voltage side capacitor including the main circuit conductor and the voltage dividing electrode and a low voltage side capacitor including the voltage dividing electrode and the ground are formed between the main circuit conductor and the ground. . The voltage of the main circuit conductor is divided by each capacitor and output.
日本国特開２００４－１２８３０４号Japanese Patent Application Laid-Open No. 2004-128304
　コンデンサ分圧形変成器の製造時には、要求される性能に応じて、低圧側静電容量を調整する必要がある。本発明の一態様は、製造時に低圧側静電容量を容易に調整できるコンデンサ分圧形変成器などを実現することを目的とする。 　When manufacturing a capacitor voltage dividing transformer, it is necessary to adjust the low-voltage side capacitance according to the required performance. An object of one aspect of the present invention is to realize a capacitor voltage dividing transformer or the like in which the low-voltage side capacitance can be easily adjusted during manufacturing.
　上記の課題を解決するため、本発明の一態様に係るコンデンサ分圧形変成器は、高電圧が印加される、軸方向に延伸する主回路導体と、前記主回路導体の外側に、前記主回路導体と同軸に配される、円筒形状を有する絶縁体円筒と、前記絶縁体円筒の外側の少なくとも一部を被覆する中間電極と、前記中間電極を覆う絶縁膜と、前記絶縁膜の少なくとも一部を覆う接地電極と、を備える。 In order to solve the above problems, a capacitor voltage dividing transformer according to an aspect of the present invention includes a main circuit conductor to which a high voltage is applied and which extends in the axial direction; At least one of an insulator cylinder having a cylindrical shape arranged coaxially with a circuit conductor, an intermediate electrode covering at least a part of an outer side of the insulator cylinder, an insulating film covering the intermediate electrode, and the insulating film. and a ground electrode covering the portion.
　本発明の一態様によれば、製造時に低圧側静電容量を容易に調整できるコンデンサ分圧形変成器などを実現できる。 According to one aspect of the present invention, it is possible to realize a capacitor voltage dividing transformer or the like that can easily adjust the low-voltage side capacitance during manufacturing.
実施形態１に係る電圧変成装置による電圧変成の例を示す回路図である。4 is a circuit diagram showing an example of voltage transformation by the voltage transformation device according to Embodiment 1; FIG. 実施形態１に係る電圧変成装置の構成を示す断面図である。1 is a cross-sectional view showing the configuration of a voltage transformer according to Embodiment 1; FIG. 実施形態１に係るコンデンサ分圧形変成器の主要部の構成を示す図である。1 is a diagram showing the configuration of a main part of a capacitor voltage dividing transformer according to Embodiment 1; FIG. 実施形態２に係る電圧変成装置の、要部の構成を示す図である。FIG. 10 is a diagram showing the configuration of a main part of a voltage transformer according to Embodiment 2; 実施形態３に係る電圧変成装置の、要部の構成を示す図である。FIG. 10 is a diagram showing the configuration of the main part of the voltage transformer according to Embodiment 3;
　〔実施形態１〕
　以下、本発明の一実施形態について、詳細に説明する。 [Embodiment 1]
An embodiment of the present invention will be described in detail below.
　（電圧変成）
　図１は、電圧変成装置１による電圧変成の例を示す回路図である。図１に示す例では、電圧変成装置１は、互いに直列に接続されたコンデンサ１１１，１１２を備える。高圧側のコンデンサ１１１の静電容量はＣ１である。低圧側のコンデンサ１１２の静電容量はＣ２である。コンデンサ１１１の、コンデンサ１１２とは逆側は、交流電源１２０に接続されている。コンデンサ１１２の、コンデンサ１１１とは逆側は、接地されている。コンデンサ１１２と並列に、抵抗１３０が接続されている。抵抗１３０の抵抗値はＲである。 (voltage transformation)
FIG. 1 is a circuit diagram showing an example of voltage transformation by a voltage transformation device 1. As shown in FIG. In the example shown in FIG. 1, the voltage transformer 1 comprises capacitors 111 and 112 connected in series with each other. The capacitance of the capacitor 111 on the high voltage side is C1. The capacitance of capacitor 112 on the low voltage side is C2. The opposite side of the capacitor 111 to the capacitor 112 is connected to the AC power supply 120 . The opposite side of the capacitor 112 to the capacitor 111 is grounded. A resistor 130 is connected in parallel with the capacitor 112 . The resistance value of resistor 130 is R.
　交流電源１２０により、電圧変成装置１に電圧Ｖ１が印加される。電圧Ｖ１は、コンデンサ１１１と、コンデンサ１１２および抵抗１３０とのそれぞれに、静電容量Ｃ１，Ｃ２および抵抗値Ｒに応じて分圧される。抵抗１３０に印加される電圧Ｖ２は、コンデンサ１１２に印加される分圧に等しくなる。これにより、電圧Ｖ１が電圧Ｖ２に変成される。 A voltage V1 is applied to the voltage transformer 1 by the AC power supply 120 . Voltage V1 is divided by capacitor 111, capacitor 112 and resistor 130 according to capacitances C1 and C2 and resistance value R, respectively. The voltage V2 applied to resistor 130 is equal to the divided voltage applied to capacitor 112 . As a result, the voltage V1 is transformed into the voltage V2.
　（電圧変成装置１の構成）
　図２は、電圧変成装置１の構成を示す断面図である。図２に示すように、電圧変成装置１は、コンデンサ分圧形変成器１０と、コンデンサ分圧形変成器１０を収容する容器２０とを備える。図２においては、電圧変成装置１は、コンデンサ分圧形変成器１０を１つ備える。ただし、電圧変成装置１が備えるコンデンサ分圧形変成器１０の数はこれに限らない。容器２０の内部には液体または気体の絶縁体が充填されている。 (Configuration of voltage transformer 1)
FIG. 2 is a cross-sectional view showing the configuration of the voltage transformer 1. As shown in FIG. As shown in FIG. 2, the voltage transformer 1 includes a capacitor voltage dividing transformer 10 and a container 20 that accommodates the capacitor voltage dividing transformer 10 . In FIG. 2, the voltage transformer 1 comprises one capacitor voltage dividing transformer 10 . However, the number of capacitor voltage dividing transformers 10 included in the voltage transformer 1 is not limited to this. The interior of container 20 is filled with a liquid or gas insulator.
　容器２０は、例えば２つに分割可能な構造を有している。このような構造を有する容器２０にコンデンサ分圧形変成器１０を収容するときには、２つに分割した容器２０を、コンデンサ分圧形変成器１０を覆うように結合させればよい。 The container 20 has, for example, a structure that can be divided into two. When the capacitor voltage dividing transformer 10 is housed in the container 20 having such a structure, the two divided containers 20 may be combined so as to cover the capacitor voltage dividing transformer 10 .
　図３は、コンデンサ分圧形変成器１０の主要部の構成を示す図である。図３には、容器２０についても合わせて示している。図３において、符号３０１は、主回路導体１１の軸方向に垂直な面における電圧変成装置１の断面図である。符号３０２は、符号３０１に示した断面図におけるＡ－Ａ線断面図である。図３に示すように、コンデンサ分圧形変成器１０は、主回路導体１１、絶縁体円筒１２、中間電極１３、絶縁膜１４、および接地電極１５を備える。また、コンデンサ分圧形変成器１０は、主回路導体１１、中間電極１３、および接地電極１５のそれぞれに電気的に接続された配線（不図示）を備える。 FIG. 3 is a diagram showing the configuration of the main part of the capacitor voltage dividing transformer 10. As shown in FIG. FIG. 3 also shows the container 20 . In FIG. 3 , reference numeral 301 is a cross-sectional view of the voltage transformer 1 taken along a plane perpendicular to the axial direction of the main circuit conductor 11 . Reference numeral 302 is a sectional view taken along the line AA in the sectional view indicated by reference numeral 301. FIG. As shown in FIG. 3, the capacitor voltage dividing transformer 10 comprises a main circuit conductor 11, an insulator cylinder 12, an intermediate electrode 13, an insulating film 14, and a ground electrode 15. Capacitor voltage divider transformer 10 also includes wiring (not shown) electrically connected to each of main circuit conductor 11 , intermediate electrode 13 , and ground electrode 15 .
　主回路導体１１は、交流電源１２０（図１参照）に接続され、高電圧が印加される導体である。主回路導体１１は、軸方向に延伸する形状を有する。主回路導体１１は、例えば円筒形状、または円柱形状を有する。座標軸を示している図面では、主回路導体１１の軸方向をＸ軸方向とし、Ｘ軸方向に垂直かつ互いに直交する２方向をＹ軸方向およびＺ軸方向としている。主回路導体１１の材料としては、公知の導体を特に制限されず用いることができる。主回路導体１１は容器２０に対して固定されている。 The main circuit conductor 11 is a conductor connected to an AC power supply 120 (see FIG. 1) and to which a high voltage is applied. The main circuit conductor 11 has a shape extending in the axial direction. The main circuit conductor 11 has, for example, a cylindrical shape or a columnar shape. In the drawings showing coordinate axes, the axial direction of the main circuit conductor 11 is defined as the X-axis direction, and two directions perpendicular to the X-axis direction and perpendicular to each other are defined as the Y-axis direction and the Z-axis direction. As the material of the main circuit conductor 11, any known conductor can be used without particular limitation. The main circuit conductor 11 is fixed relative to the container 20 .
　絶縁体円筒１２は、円筒形状を有する構造物である。絶縁体円筒１２は、主回路導体１１と同軸に配される。絶縁体円筒１２を形成する絶縁体は、例えばエポキシ樹脂である。 The insulator cylinder 12 is a structure having a cylindrical shape. The insulator cylinder 12 is arranged coaxially with the main circuit conductor 11 . The insulator forming the insulator cylinder 12 is, for example, epoxy resin.
　中間電極１３は、絶縁体円筒１２の外側の少なくとも一部を被覆する。中間電極１３は、絶縁体円筒１２に巻き付けられる金属箔である。中間電極１３を形成する金属箔の材料の例としては銅が挙げられる。主回路導体１１、絶縁体円筒１２および中間電極１３が、図１に示したコンデンサ１１１を構成する。 The intermediate electrode 13 covers at least part of the outside of the insulator cylinder 12 . The intermediate electrode 13 is a metal foil wrapped around the insulator cylinder 12 . An example of the material of the metal foil that forms the intermediate electrode 13 is copper. Main circuit conductor 11, insulator cylinder 12 and intermediate electrode 13 constitute capacitor 111 shown in FIG.
　絶縁膜１４は、中間電極１３を覆う。絶縁膜１４は、中間電極１３の外側を覆うように巻き付けられる絶縁体のフィルムである。絶縁体の例としてはポリエステルが挙げられる。絶縁膜１４は、中間電極１３と接地電極１５とを電気的に絶縁する。 The insulating film 14 covers the intermediate electrode 13 . The insulating film 14 is an insulating film wrapped around the intermediate electrode 13 so as to cover the outside thereof. Examples of insulators include polyester. The insulating film 14 electrically insulates the intermediate electrode 13 and the ground electrode 15 .
　接地電極１５は、絶縁膜１４の少なくとも一部を覆う。接地電極１５は、絶縁膜１４の外側に巻き付けられる金属箔である。接地電極１５を形成する金属箔の材料の例としては、中間電極１３を形成する金属箔の材料と同様に、銅が挙げられる。中間電極１３、絶縁膜１４および接地電極１５が、図１に示したコンデンサ１１２を構成する。 The ground electrode 15 covers at least part of the insulating film 14 . The ground electrode 15 is a metal foil wrapped around the outside of the insulating film 14 . An example of the material of the metal foil forming the ground electrode 15 is copper, like the material of the metal foil forming the intermediate electrode 13 . Intermediate electrode 13, insulating film 14 and ground electrode 15 constitute capacitor 112 shown in FIG.
　図２に戻って、電圧変成装置１は、取付板２１をさらに備える。取付板２１は、絶縁体円筒１２を容器２０に固定するための構造物である。取付板２１は、絶縁体円筒１２が主回路導体１１と同軸に取り付けられた状態において、主回路導体１１の軸方向における絶縁体円筒１２の両端に位置する。取付板２１の材料は、剛性を有する材料であれば特に制限されず、例えばアルミニウムまたはエポキシ樹脂であってよい。取付板２１は、絶縁体円筒１２と一体に形成されてもよい。取付板２１が容器２０に取り付けられることで、絶縁体円筒１２が容器２０に固定される。これにより、コンデンサ分圧形変成器１０を、容器２０に直接接触させることなく容器２０に固定できる。 Returning to FIG. 2 , the voltage transformer 1 further includes a mounting plate 21 . The mounting plate 21 is a structure for fixing the insulator cylinder 12 to the container 20 . The mounting plates 21 are positioned at both ends of the insulator cylinder 12 in the axial direction of the main circuit conductor 11 when the insulator cylinder 12 is coaxially attached to the main circuit conductor 11 . The material of the mounting plate 21 is not particularly limited as long as it has rigidity, and may be aluminum or epoxy resin, for example. The mounting plate 21 may be formed integrally with the insulator cylinder 12 . The insulator cylinder 12 is fixed to the container 20 by attaching the mounting plate 21 to the container 20 . Thereby, the capacitor voltage dividing transformer 10 can be fixed to the container 20 without being brought into direct contact with the container 20 .
　例えば、取付板２１は、径方向に延伸する平板状の形状を有する。一方、容器２０は、取付板２１に対して主回路導体１１の軸方向における外側から当接する軸方向当接部２０ａを、軸方向における２箇所に有する。ここでいう軸方向における外側とは、それぞれの取付板２１の、軸方向における他方の取付板２１とは逆側を指す。２箇所の軸方向当接部２０ａの間に取付板２１を挟持する形で、軸方向における取付板２１の位置を固定した状態で、容器２０に取付板２１を取り付けることができる。 For example, the mounting plate 21 has a flat plate shape extending in the radial direction. On the other hand, the container 20 has two axial contact portions 20a that contact the mounting plate 21 from the outer side of the main circuit conductor 11 in the axial direction. Here, the outer side in the axial direction refers to the opposite side of each mounting plate 21 from the other mounting plate 21 in the axial direction. The mounting plate 21 can be attached to the container 20 in a state where the position of the mounting plate 21 in the axial direction is fixed by sandwiching the mounting plate 21 between the two axial contact portions 20a.
　また、容器２０はさらに、取付板２１に対して径方向における外側から当接する径方向当接部２０ｂを、軸方向における２箇所に有する。径方向当接部２０ｂは、軸方向における取付板２１の位置に対応する位置において、例えば周方向における全体にわたって設けられる。径方向当接部２０ｂが取付板２１に対して径方向における外側から当接することで、径方向における取付板２１の位置を固定した状態で、容器２０に取付板２１を取り付けることができる。ただし、径方向当接部２０ｂは、必ずしも周方向における全体にわたって設けられる必要はない。径方向当接部２０ｂの位置、数およびサイズは、径方向における取付板２１の位置を固定できるように、適宜決定されてよい。 In addition, the container 20 further has radial contact portions 20b that contact the mounting plate 21 from the outside in the radial direction at two locations in the axial direction. The radial contact portion 20b is provided, for example, over the entire circumferential direction at a position corresponding to the position of the mounting plate 21 in the axial direction. The radial contact portion 20b contacts the mounting plate 21 from the outside in the radial direction, so that the mounting plate 21 can be attached to the container 20 while the position of the mounting plate 21 in the radial direction is fixed. However, the radial contact portion 20b does not necessarily have to be provided over the entire circumferential direction. The position, number and size of the radial contact portions 20b may be appropriately determined so that the position of the mounting plate 21 in the radial direction can be fixed.
　ただし、容器２０に取付板２１を取り付ける構造は、上記の例に限定されない。例えば容器２０は、軸方向当接部２０ａの代わりに、２枚の取付板２１のそれぞれに軸方向における内側または外側から当接する部位を有していてもよい。 However, the structure for attaching the mounting plate 21 to the container 20 is not limited to the above example. For example, instead of the axial contact portion 20a, the container 20 may have portions that contact the two mounting plates 21 from the inner side or the outer side in the axial direction.
　電圧変成装置１は、シールド２２をさらに備える。シールド２２は、絶縁体円筒１２に対向していない主回路導体１１の領域と、絶縁体円筒１２との間の電界を緩和する。シールド２２の材料としては、電界を緩和することが可能な公知の材料を、特に制限されず用いることができる。シールド２２は、主回路導体１１の軸方向における２枚の取付板２１の外側に配置される。 The voltage transformer 1 further includes a shield 22 . The shield 22 reduces the electric field between the insulator cylinder 12 and the region of the main circuit conductor 11 not facing the insulator cylinder 12 . As the material of the shield 22, any known material capable of alleviating an electric field can be used without particular limitation. The shield 22 is arranged outside the two mounting plates 21 in the axial direction of the main circuit conductor 11 .
　絶縁体円筒１２に対向していない主回路導体１１の領域と、絶縁体円筒１２との間の電界は、コンデンサ１１１の静電容量を増加させる。このため、当該電界に起因して、コンデンサ１１１の静電容量に誤差が生じる。その結果、コンデンサ１１１，１１２の静電容量の比率、さらにはコンデンサ１１２の分圧に誤差が生じる。シールド２２により電界を緩和することで、コンデンサ１１２の分圧の誤差を小さくすることができる。ただし、電圧変成装置１においてシールド２２は必須ではなく、省略されてもよい。 The electric field between the region of the main circuit conductor 11 not facing the insulator cylinder 12 and the insulator cylinder 12 increases the capacitance of the capacitor 111 . Therefore, an error occurs in the capacitance of the capacitor 111 due to the electric field. As a result, an error occurs in the capacitance ratio of the capacitors 111 and 112 and also in the voltage division of the capacitor 112 . By alleviating the electric field with the shield 22, the voltage division error of the capacitor 112 can be reduced. However, the shield 22 is not essential in the voltage transformer 1 and may be omitted.
　（電圧変成装置１の製造方法）
　電圧変成装置１の製造方法は以下のとおりである。まず、絶縁体円筒１２を形成する。絶縁体円筒１２に、中間電極１３の材料である金属箔を、軸方向における中間電極１３の長さに等しい幅に切断した上で巻き付けることで、中間電極１３を形成する。中間電極１３の上に、絶縁膜１４の材料である絶縁体のフィルムを、軸方向における絶縁膜１４の長さに等しい幅に切断した上で巻き付けることで、絶縁膜１４を形成する。さらに、絶縁膜１４の上に、接地電極１５の材料である金属箔を、軸方向における接地電極１５の長さに等しい幅に切断した上で巻き付けることで、接地電極１５を形成する。 (Manufacturing method of voltage transformer 1)
A method of manufacturing the voltage transformer 1 is as follows. First, the insulator cylinder 12 is formed. The intermediate electrode 13 is formed by cutting a metal foil, which is the material of the intermediate electrode 13 , into a width equal to the length of the intermediate electrode 13 in the axial direction and winding it around the insulator cylinder 12 . The insulating film 14 is formed on the intermediate electrode 13 by cutting an insulating film, which is the material of the insulating film 14, into a width equal to the length of the insulating film 14 in the axial direction and winding it. Further, the ground electrode 15 is formed by cutting a metal foil, which is the material of the ground electrode 15, into a width equal to the length of the ground electrode 15 in the axial direction and winding it on the insulating film 14. FIG.
　絶縁体円筒１２に、取付板２１およびシールド２２を取り付ける。絶縁体円筒１２に主回路導体を挿入する。さらに、絶縁体円筒１２に取り付けられた状態の取付板２１、および主回路導体１１を、それぞれ容器２０に固定する。その後、容器２０内に液体または気体の絶縁体を充填する。以上の工程により、電圧変成装置１が製造される。 A mounting plate 21 and a shield 22 are attached to the insulator cylinder 12 . A main circuit conductor is inserted into the insulator cylinder 12 . Furthermore, the mounting plate 21 attached to the insulator cylinder 12 and the main circuit conductor 11 are each fixed to the container 20 . After that, the container 20 is filled with a liquid or gas insulator. The voltage transformer 1 is manufactured by the above steps.
　（コンデンサ分圧形変成器１０の効果）
　上述したとおり、コンデンサ分圧形変成器１０においては、絶縁体円筒１２に、中間電極１３、絶縁膜１４、および接地電極１５を、注型等を用いることなく形成する。このため、中間電極１３、絶縁膜１４、および接地電極１５の設計諸元を容易に変更できる。例えばコンデンサ分圧形変成器１０においては、要求性能に応じて、絶縁膜１４を形成する絶縁体の材質（誘電率）、厚さ、および／または当該フィルムの枚数を任意に変更できる。したがって、コンデンサ分圧形変成器１０の製造時に、コンデンサ１１２の静電容量を容易に調整できる。 (Effect of Capacitor Voltage Division Transformer 10)
As described above, in the capacitor voltage dividing transformer 10, the intermediate electrode 13, the insulating film 14, and the ground electrode 15 are formed on the insulator cylinder 12 without using casting or the like. Therefore, the design specifications of the intermediate electrode 13, the insulating film 14, and the ground electrode 15 can be easily changed. For example, in the capacitor voltage dividing transformer 10, the material (dielectric constant) and thickness of the insulator forming the insulating film 14, and/or the number of films can be arbitrarily changed according to the required performance. Therefore, the capacitance of the capacitor 112 can be easily adjusted when the capacitor voltage dividing transformer 10 is manufactured.
　中間電極１３および接地電極１５を形成する金属箔は、電解法または圧延法により製造されたものであることが好ましい。一般的に、電解法または圧延法により製造された金属箔は、他の方法で製造された金属箔と比較して残留応力が小さい。このため、金属箔を製造してからの時間経過、または、温度変化などの環境変化に伴い残留応力に変化が生じても、当該変化に伴う金属箔の形状の変化が小さい。したがって、当該金属箔により形成された中間電極１３および接地電極１５の、形状の変化が小さい。すなわち、コンデンサ１１１，１１２の静電容量の、時間経過、または、温度変化などの環境変化による変動が小さくなる。したがって、コンデンサ１１１，１１２の静電容量が変動して当該静電容量の比率が変動することに起因する、電圧変成装置１による電圧の変成の誤差が低減される。また、中間電極１３および接地電極１５を金属箔により形成することで、例えば金属板を変形させ、溶接することで形成する場合と比較して軽量化できる。 The metal foil forming the intermediate electrode 13 and the ground electrode 15 is preferably manufactured by an electrolytic method or a rolling method. In general, metal foils produced by electrolysis or rolling have less residual stress than metal foils produced by other methods. Therefore, even if the residual stress changes due to the passage of time after manufacturing the metal foil or environmental changes such as temperature changes, the change in the shape of the metal foil is small. Therefore, the change in shape of the intermediate electrode 13 and the ground electrode 15 formed of the metal foil is small. That is, fluctuations in the capacitance of the capacitors 111 and 112 due to passage of time or environmental changes such as temperature changes are reduced. Therefore, errors in voltage transformation by the voltage transformer 1 caused by variations in the capacitance ratio of the capacitors 111 and 112 are reduced. In addition, by forming the intermediate electrode 13 and the ground electrode 15 from metal foil, the weight can be reduced as compared with the case of forming by deforming and welding a metal plate, for example.
　また、電圧変成装置１の製造前に、中間電極１３および接地電極１５の材料である金属箔に熱処理を実施してもよい。熱処理を実施することで、金属箔の残留応力がさらに小さくなる。このような金属箔により中間電極１３および接地電極１５を形成することで、時間経過、または、温度変化などの環境変化による中間電極１３および接地電極１５の形状の変化がさらに小さくなる。すなわち、コンデンサ１１１，１１２の静電容量の、時間経過、または、温度変化などの環境変化による変動がさらに小さくなる。したがって、コンデンサ１１１，１１２の静電容量が変動して当該静電容量の比率が変動することに起因する、電圧変成装置１による電圧の変成の誤差が、より低減される。 Also, before manufacturing the voltage transformer 1, the metal foil, which is the material of the intermediate electrode 13 and the ground electrode 15, may be heat-treated. By performing the heat treatment, the residual stress of the metal foil is further reduced. Forming the intermediate electrode 13 and the ground electrode 15 from such a metal foil further reduces changes in the shape of the intermediate electrode 13 and the ground electrode 15 due to the passage of time or environmental changes such as temperature changes. That is, the fluctuations in the capacitance of the capacitors 111 and 112 due to passage of time or environmental changes such as temperature changes are further reduced. Therefore, errors in the voltage transformation by the voltage transformer 1 caused by variations in the capacitance ratio of the capacitors 111 and 112 are further reduced.
　主回路導体１１の軸方向における接地電極１５の長さは、当該軸方向における中間電極１３の長さよりも長いことが好ましい。このような接地電極１５は、中間電極１３に対する電界を緩和するシールド電極として機能し、主回路導体１１と中間電極１３との間の電界の平等化に寄与する。具体的には、接地電極１５は、中間電極１３の端部への電界、および中間電極１３の絶縁膜１４側の面への電界を抑制する。これにより、コンデンサ分圧形変成器１０の一部または全体の温度が変化し、中間電極１３が温度変化により変形した場合における、コンデンサ１１１の静電容量Ｃ１の変化量を低減できる。コンデンサ分圧形変成器１０の一部または全体の温度が変化する原因としては、電圧変成装置１の製造後または使用中における周囲温度の変化、主回路導体１１へ通電電流が流れることによる主回路導体１１の発熱、または周辺の機器の発熱が挙げられる。同時に、コンデンサ分圧形変成器１０の設計時における、静電容量Ｃ１の計算精度も向上する。 The length of the ground electrode 15 in the axial direction of the main circuit conductor 11 is preferably longer than the length of the intermediate electrode 13 in the axial direction. Such a ground electrode 15 functions as a shield electrode that mitigates the electric field on the intermediate electrode 13 and contributes to the equalization of the electric field between the main circuit conductor 11 and the intermediate electrode 13 . Specifically, the ground electrode 15 suppresses an electric field to the end of the intermediate electrode 13 and an electric field to the surface of the intermediate electrode 13 on the insulating film 14 side. This can reduce the amount of change in the capacitance C1 of the capacitor 111 when the temperature of a part or the whole of the capacitor voltage dividing transformer 10 changes and the intermediate electrode 13 deforms due to the temperature change. The temperature of a part or the whole of the capacitor voltage dividing transformer 10 may change due to changes in the ambient temperature after the voltage transformer 1 is manufactured or during use, or due to current flowing through the main circuit conductor 11 . Heat generation of the conductor 11 or heat generation of peripheral devices can be mentioned. At the same time, the calculation accuracy of the capacitance C1 when designing the capacitor voltage dividing transformer 10 is also improved.
　（絶縁体円筒１２について）
　中間電極１３を形成する金属は、正の熱膨張係数を有するため、温度の上昇により膨張する。その結果、中間電極１３の表面積は、温度の上昇により増大する。一方、絶縁体円筒１２を形成する絶縁体の誘電率は、絶縁体の種類に応じて温度の上昇により低下する場合も増大する場合もある。温度が下降した場合、中間電極１３の表面積および絶縁体円筒１２を形成する絶縁体の誘電率は、温度が上昇した場合とは逆に変化する。絶縁体円筒１２を形成する絶縁体として温度の上昇により誘電率が低下する材料を選定すれば、中間電極１３および絶縁体円筒１２は、コンデンサ１１１の温度の変動に対して、コンデンサ１１１の静電容量を互いに逆方向に変化させるように作用する。したがって、コンデンサ１１１の温度の変動に対する静電容量の変動は、中間電極１３の表面積の変動による影響と、絶縁体円筒１２を形成する絶縁体の誘電率の変動による影響とのバランスにより決定される。 (Regarding insulator cylinder 12)
Since the metal forming the intermediate electrode 13 has a positive coefficient of thermal expansion, it expands as the temperature rises. As a result, the surface area of the intermediate electrode 13 increases with increasing temperature. On the other hand, the dielectric constant of the insulator forming the insulator cylinder 12 may decrease or increase as the temperature rises, depending on the type of insulator. When the temperature drops, the surface area of the intermediate electrode 13 and the dielectric constant of the insulator forming the insulator cylinder 12 change opposite to when the temperature rises. If a material whose dielectric constant decreases with an increase in temperature is selected as the insulator forming the insulator cylinder 12, the intermediate electrode 13 and the insulator cylinder 12 will not be affected by the temperature fluctuations of the capacitor 111. They act to change the capacitance in opposite directions. Therefore, the variation of the capacitance with respect to the temperature variation of the capacitor 111 is determined by the balance between the influence of the variation of the surface area of the intermediate electrode 13 and the variation of the dielectric constant of the insulator forming the insulator cylinder 12. .
　絶縁体円筒１２の材料は、温度変化に対して、中間電極１３の表面積の変動による影響と、絶縁体円筒１２を形成する絶縁体の誘電率の変動による影響とが互いに打ち消し合うように、中間電極１３の材料に応じて選択されることが好ましい。このように絶縁体円筒１２の材料を選択することで、コンデンサ１１１の静電容量を、コンデンサ１１１の温度の変動に対して略一定にすることができる。 The material of the insulator cylinder 12 is selected so that the influence of variations in the surface area of the intermediate electrode 13 and the influence of variations in the dielectric constant of the insulator forming the insulator cylinder 12 cancel each other out with respect to temperature changes. It is preferable to select according to the material of the electrode 13 . By selecting the material of the insulator cylinder 12 in this way, the capacitance of the capacitor 111 can be made substantially constant with respect to the temperature fluctuation of the capacitor 111 .
　また、コンデンサ分圧形変成器１０においては、径方向における絶縁体円筒１２の大きさを変更することで、主回路導体１１との絶縁距離を確保できる。したがって、コンデンサ分圧形変成器１０の適用電圧クラスを容易に拡大できる。 Also, in the capacitor voltage dividing transformer 10, by changing the size of the insulator cylinder 12 in the radial direction, the insulation distance from the main circuit conductor 11 can be secured. Therefore, the applicable voltage class of the capacitor voltage dividing transformer 10 can be easily expanded.
　また、電圧変成装置１においては、主回路導体１１の軸方向における絶縁体円筒１２の大きさを拡大し、中間電極１３、絶縁膜１４、および接地電極１５を追加することで、主回路導体１１を共有するコンデンサ分圧形変成器１０の数量を容易に増加させることができる。電圧変成装置１が、主回路導体１１の軸方向に隣接する複数のコンデンサ分圧形変成器１０を備える場合、それらのコンデンサ分圧形変成器１０は、単一の主回路導体１１を共有する。また、電圧変成装置１においては、主回路導体１１の軸方向における中間電極１３の長さを変更することで、分圧比の調整を容易に行うことができる。 Further, in the voltage transformer 1, the size of the insulator cylinder 12 in the axial direction of the main circuit conductor 11 is enlarged, and the intermediate electrode 13, the insulating film 14, and the ground electrode 15 are added. can easily be increased in number of capacitor voltage divider transformers 10 that share . If the voltage transformer device 1 comprises a plurality of capacitive divider transformers 10 axially adjacent to the main circuit conductors 11, the capacitive divider transformers 10 share a single main circuit conductor 11. . Further, in the voltage transformer 1, by changing the length of the intermediate electrode 13 in the axial direction of the main circuit conductor 11, the voltage division ratio can be easily adjusted.
　〔実施形態２〕
　本発明の他の実施形態について、以下に説明する。なお、説明の便宜上、上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。 [Embodiment 2]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.
　図４は、実施形態２に係る電圧変成装置２の、要部の構成を示す図である。図４には、電圧変成装置２が備えるコンデンサ分圧形変成器１０Ａおよび容器２０が示されている。図４において、符号４０１は、主回路導体１１の軸方向に垂直な面における電圧変成装置２の断面図である。符号４０２は、符号４０１に示した断面図におけるＢ－Ｂ線断面図である。 FIG. 4 is a diagram showing the configuration of the main part of the voltage transformer 2 according to Embodiment 2. As shown in FIG. FIG. 4 shows a capacitor voltage dividing transformer 10A and a container 20 included in the voltage transformer 2. As shown in FIG. In FIG. 4 , reference numeral 401 is a cross-sectional view of the voltage transformer 2 taken along a plane perpendicular to the axial direction of the main circuit conductor 11 . Reference numeral 402 is a cross-sectional view taken along the line BB in the cross-sectional view indicated by reference numeral 401. FIG.
　電圧変成装置２は、コンデンサ分圧形変成器１０の代わりにコンデンサ分圧形変成器１０Ａを備える点で電圧変成装置１と相違する。コンデンサ分圧形変成器１０Ａは、中間電極１３の代わりに中間電極２３を備える点でコンデンサ分圧形変成器１０と相違する。 The voltage transforming device 2 differs from the voltage transforming device 1 in that it includes a capacitor voltage dividing transformer 10A instead of the capacitor voltage dividing transformer 10. The capacitor voltage dividing transformer 10A differs from the capacitor voltage dividing transformer 10 in that an intermediate electrode 23 is provided instead of the intermediate electrode 13 .
　また、コンデンサ分圧形変成器１０Ａは、コンデンサ分圧形変成器１０と同様に、主回路導体１１絶縁体円筒１２、絶縁膜１４、および接地電極１５を備える。ただし、中間電極２３の形状を視認しやすくするため、図４においては、絶縁体円筒１２、絶縁膜１４および接地電極１５を省略している。また、電圧変成装置２は、電圧変成装置１と同様に、取付板２１およびシールド２２を備える。取付板２１およびシールド２２についても図４では省略している。 Also, the capacitor voltage dividing transformer 10A includes a main circuit conductor 11, an insulator cylinder 12, an insulating film 14, and a ground electrode 15, similar to the capacitor voltage dividing transformer 10. However, in FIG. 4, the insulator cylinder 12, the insulator film 14 and the ground electrode 15 are omitted in order to make the shape of the intermediate electrode 23 easier to see. The voltage transformer 2 also includes a mounting plate 21 and a shield 22, similar to the voltage transformer 1. As shown in FIG. The mounting plate 21 and the shield 22 are also omitted in FIG.
　主回路導体１１の周方向における中間電極２３の長さは、主回路導体１１の周方向における絶縁体円筒１２の長さよりも短い。このため、図４に示すように、主回路導体１１の周方向における中間電極２３の一端と他端との間にギャップ２３ａが形成されている。中間電極２３にギャップ２３ａが形成されていることで、中間電極２３においては、主回路導体１１を周方向に周回する電流が流れない。したがって、電圧変成装置２においては、主回路導体１１に電圧を印加した場合に中間電極２３に発生する誘導電流および誘導起電力が小さくなる。ギャップ２３ａの幅は、上記の誘導電流および誘導起電力が十分に小さくなるように適宜決定されればよく、例えば１ｍｍ以上３ｍｍ以下としてよい。 The length of the intermediate electrode 23 in the circumferential direction of the main circuit conductor 11 is shorter than the length of the insulator cylinder 12 in the circumferential direction of the main circuit conductor 11 . Therefore, as shown in FIG. 4, a gap 23a is formed between one end and the other end of the intermediate electrode 23 in the circumferential direction of the main circuit conductor 11 . Since the gap 23 a is formed in the intermediate electrode 23 , a current that circulates around the main circuit conductor 11 in the circumferential direction does not flow in the intermediate electrode 23 . Therefore, in the voltage transformer 2, the induced current and the induced electromotive force generated in the intermediate electrode 23 when a voltage is applied to the main circuit conductor 11 are reduced. The width of the gap 23a may be appropriately determined so that the induced current and the induced electromotive force are sufficiently small, and may be, for example, 1 mm or more and 3 mm or less.
　中間電極２３に誘導起電力が発生すると、コンデンサ１１２（図１参照）における電圧に変動が生じる。当該変動により、電圧変成装置２により変成される電圧Ｖ２にも変動が生じる。すなわち、電圧変成装置２による電圧の変成に誤差が生じる原因となる。誘導起電力を小さくすることで、電圧変成装置２における電圧の変成の誤差が低減される。 When an induced electromotive force is generated in the intermediate electrode 23, the voltage in the capacitor 112 (see FIG. 1) fluctuates. Due to this variation, the voltage V2 transformed by the voltage transformer 2 also varies. That is, it causes an error in voltage transformation by the voltage transformation device 2 . By reducing the induced electromotive force, the voltage transformation error in the voltage transformer 2 is reduced.
　電圧変成装置２の製造方法は、中間電極２３を形成する工程についてのみ、電圧変成装置１の製造方法と相違する。具体的には、中間電極２３を形成する工程において、中間電極２３の材料である金属箔を、主回路導体１１の周方向における絶縁体円筒１２の長さよりも、ギャップ２３ａの幅だけ短く切り取った上で絶縁体円筒１２に巻き付ける。 The method of manufacturing the voltage transformer 2 differs from the method of manufacturing the voltage transformer 1 only in the process of forming the intermediate electrode 23 . Specifically, in the step of forming the intermediate electrode 23, the metal foil, which is the material of the intermediate electrode 23, is cut shorter than the length of the insulator cylinder 12 in the circumferential direction of the main circuit conductor 11 by the width of the gap 23a. It wraps around the insulator cylinder 12 on top.
　なお、上述したとおり、コンデンサ分圧形変成器１０Ａは、絶縁体円筒１２、絶縁膜１４、および接地電極１５を備える。絶縁体円筒１２、絶縁膜１４、および接地電極１５の形状は、実施形態１において説明したとおりであってよい。すなわち、これらの構成要素は、中間電極２３に対応した形状を有する必要はない。 As described above, the capacitor voltage dividing transformer 10A includes the insulator cylinder 12, the insulator film 14, and the ground electrode 15. The shape of the insulator cylinder 12, the insulating film 14, and the ground electrode 15 may be as described in the first embodiment. That is, these components need not have shapes corresponding to the intermediate electrode 23 .
　また、中間電極２３の形状は、必ずしもギャップ２３ａが形成されるものに限定されない。中間電極２３は、主回路導体１１の周方向に周回する閉ループを含まなければよい。例えば、主回路導体１１の周方向における中間電極２３の長さが、主回路導体１１の周方向における絶縁体円筒１２の長さよりも長い場合を考える。この場合において、中間電極２３は、主回路導体１１の軸の周方向における一端側と他端側とが主回路導体１１の径方向に互いに離隔する構造を有していてもよい。中間電極２３がこのような形状を有する場合であっても、主回路導体１１に高電圧を印加した場合に中間電極２３に発生する誘導電流および誘導起電力が小さくなる。したがって、電圧変成装置２における電圧の変成の誤差が低減される。 Also, the shape of the intermediate electrode 23 is not necessarily limited to one in which the gap 23a is formed. The intermediate electrode 23 need not include a closed loop that circulates in the circumferential direction of the main circuit conductor 11 . For example, consider a case where the length of the intermediate electrode 23 in the circumferential direction of the main circuit conductor 11 is longer than the length of the insulator cylinder 12 in the circumferential direction of the main circuit conductor 11 . In this case, the intermediate electrode 23 may have a structure in which one end side and the other end side in the circumferential direction of the axis of the main circuit conductor 11 are separated from each other in the radial direction of the main circuit conductor 11 . Even if the intermediate electrode 23 has such a shape, the induced current and induced electromotive force generated in the intermediate electrode 23 when a high voltage is applied to the main circuit conductor 11 are reduced. Therefore, the voltage transformation error in the voltage transformer 2 is reduced.
　〔実施形態３〕
　本発明の他の実施形態について、以下に説明する。なお、説明の便宜上、上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。 [Embodiment 3]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.
　図５は、実施形態３に係る電圧変成装置３の、要部の構成を示す図である。図５には、電圧変成装置３が備えるコンデンサ分圧形変成器１０および容器２０が示されている。図５において、符号５０１は、主回路導体１１の軸方向に垂直な面における電圧変成装置３の断面図である。符号５０２は、符号５０１に示した断面図におけるＣ－Ｃ線断面図である。 FIG. 5 is a diagram showing the configuration of the main part of the voltage transformer 3 according to Embodiment 3. As shown in FIG. FIG. 5 shows a capacitor voltage dividing transformer 10 and a container 20 included in the voltage transformer 3. As shown in FIG. In FIG. 5 , reference numeral 501 is a cross-sectional view of the voltage transformer 3 in a plane perpendicular to the axial direction of the main circuit conductor 11 . Reference numeral 502 is a sectional view taken along line CC of the sectional view indicated by reference numeral 501. FIG.
　電圧変成装置３は、３相交流電力に対応可能な電圧変成装置である。電圧変成装置３は、主回路導体１１が互いに別個である３つのコンデンサ分圧形変成器１０を備える点で、電圧変成装置１と相違する。容器２０は、３つのコンデンサ分圧形変成器１０を収容する。電圧変成装置３は、３つのコンデンサ分圧形変成器１０が備える３つの絶縁体円筒１２に対応する、共通の取付板２１を備えてよい。３つのコンデンサ分圧形変成器１０はそれぞれ、３相の交流電力のそれぞれに対応する。このような電圧変成装置３も、電圧変成装置１と同様の効果を奏する。 The voltage transformer 3 is a voltage transformer that can handle three-phase AC power. The voltage transformer 3 differs from the voltage transformer 1 in that it comprises three capacitive divider transformers 10 whose main circuit conductors 11 are separate from each other. A container 20 houses three capacitor voltage divider transformers 10 . The voltage transformer device 3 may comprise a common mounting plate 21 corresponding to the three insulator cylinders 12 of the three capacitive voltage divider transformers 10 . The three capacitor voltage dividing transformers 10 respectively correspond to three-phase AC power. Such a voltage transformer 3 also has the same effects as the voltage transformer 1 .
　〔まとめ〕
　本発明の態様１に係るコンデンサ分圧形変成器は、高電圧が印加される、軸方向に延伸する主回路導体と、前記主回路導体の外側に、前記主回路導体と同軸に配される、円筒形状を有する絶縁体円筒と、前記絶縁体円筒の外側の少なくとも一部を被覆する中間電極と、前記中間電極を覆う絶縁膜と、前記絶縁膜の少なくとも一部を覆う接地電極と、を備える。 〔summary〕
A capacitor voltage dividing transformer according to aspect 1 of the present invention comprises an axially extending main circuit conductor to which a high voltage is applied; an insulator cylinder having a cylindrical shape; an intermediate electrode covering at least a portion of the outside of the insulator cylinder; an insulating film covering the intermediate electrode; and a ground electrode covering at least a portion of the insulating film. Prepare.
　上記の構成によれば、コンデンサ分圧形変成器が要求される仕様に応じて、中間電極、絶縁膜、および接地電極の設計諸元を容易に変更できる。したがって、コンデンサ分圧形変成器の製造時に低圧側静電容量を容易に調整できる。 According to the above configuration, it is possible to easily change the design specifications of the intermediate electrode, the insulating film, and the ground electrode according to the specifications required for the capacitor voltage dividing transformer. Therefore, the low-voltage side capacitance can be easily adjusted when manufacturing the capacitor voltage dividing transformer.
　本発明の態様２に係るコンデンサ分圧形変成器において、前記中間電極は、前記主回路導体の周方向に周回する閉ループを含まないことが好ましい。 In the capacitor voltage dividing transformer according to aspect 2 of the present invention, it is preferable that the intermediate electrode does not include a closed loop that circulates in the circumferential direction of the main circuit conductor.
　上記の構成によれば、中間電極において、主回路導体を周方向に周回する電流が流れない。このため、主回路導体に電圧を印加した場合に中間電極に発生する誘導電流および誘導起電力が小さくなる。したがって、電圧変成装置における電圧の変成の誤差が低減される。 According to the above configuration, no current flows around the main circuit conductor in the circumferential direction in the intermediate electrode. Therefore, when a voltage is applied to the main circuit conductor, the induced current and induced electromotive force generated in the intermediate electrode are reduced. Therefore, the voltage transformation error in the voltage transformer is reduced.
　本発明の態様３に係るコンデンサ分圧形変成器において、前記周方向における前記中間電極の長さは、前記周方向における前記絶縁体円筒の長さよりも短いことが好ましい。 In the capacitor voltage dividing transformer according to aspect 3 of the present invention, it is preferable that the length of the intermediate electrode in the circumferential direction is shorter than the length of the insulator cylinder in the circumferential direction.
　上記の構成によれば、主回路導体の周方向における中間電極の一部にギャップが形成される。したがって、主回路導体を周方向に周回する電流が流れなくなる。 According to the above configuration, a gap is formed in a part of the intermediate electrode in the circumferential direction of the main circuit conductor. Therefore, the current that circulates around the main circuit conductor in the circumferential direction does not flow.
　本発明の態様４に係るコンデンサ分圧形変成器において、前記軸方向における前記接地電極の長さは、前記軸方向における前記中間電極の長さよりも長いことが好ましい。 In the capacitor voltage dividing transformer according to aspect 4 of the present invention, it is preferable that the length of the ground electrode in the axial direction is longer than the length of the intermediate electrode in the axial direction.
　上記の構成によれば、中間電極の端部への電界、および中間電極の絶縁膜側の面への電界を接地電極が抑制する。したがって、中間電極が温度変化により変形した場合における、高圧側コンデンサの静電容量の変化量を低減できる。さらに、コンデンサ分圧形変成器の設計時における、高圧側コンデンサの静電容量の計算精度が向上する。 According to the above configuration, the ground electrode suppresses the electric field to the end of the intermediate electrode and the electric field to the insulating film side surface of the intermediate electrode. Therefore, it is possible to reduce the amount of change in capacitance of the high-voltage side capacitor when the intermediate electrode is deformed due to temperature change. Furthermore, the calculation accuracy of the capacitance of the high-voltage side capacitor is improved when designing the capacitor voltage dividing transformer.
　本発明の態様５に係る電圧変成装置は、上記のいずれかの態様のコンデンサ分圧形変成器と、前記コンデンサ分圧形変成器を収容する容器とを備える。 A voltage transformer according to aspect 5 of the present invention includes the capacitor voltage dividing transformer according to any one of the above aspects, and a container housing the capacitor voltage dividing transformer.
　上記の構成によれば、上記のいずれかの態様と同様の効果を奏する。 According to the above configuration, the same effect as any of the above aspects can be obtained.
　本発明の態様６に係る電圧変成装置は、前記主回路導体が互いに別個である３つの前記コンデンサ分圧形変成器を備え、前記容器は、３つの前記コンデンサ分圧形変成器を収容してもよい。 A voltage transformation device according to aspect 6 of the present invention comprises three capacitor voltage dividing transformers in which the main circuit conductors are separate from each other, and the container houses the three capacitor voltage dividing transformers. good too.
　上記の構成によれば、３つのコンデンサ分圧形変成器を３相の交流電力に対応させることで、３相交流電力に対応可能な電圧変成装置を実現できる。 According to the above configuration, by making the three capacitor voltage dividing transformers compatible with 3-phase AC power, it is possible to realize a voltage transformation device compatible with 3-phase AC power.
　本発明の態様７に係る電圧変成装置は、前記軸方向における前記絶縁体円筒の両端に固定される取付板をさらに備え、前記取付板が前記容器に取り付けられることで前記絶縁体円筒が前記容器に固定されることが好ましい。 The voltage transformer according to aspect 7 of the present invention further includes mounting plates fixed to both ends of the insulator cylinder in the axial direction, and the insulator cylinder is attached to the container by attaching the mounting plates to the container. is preferably fixed to
　上記の構成によれば、コンデンサ分圧形変成器を、容器に直接接触させることなく容器に固定できる。 According to the above configuration, the capacitor voltage dividing transformer can be fixed to the container without direct contact with the container.
　本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。 The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.
　１，２，３　電圧変成装置
　１０，１０Ａ　コンデンサ分圧形変成器
　１１　主回路導体
　１２　絶縁体円筒
　１３，２３　中間電極
　１４　絶縁膜
　１５　接地電極

  Reference Signs List 1, 2, 3 voltage transformer 10, 10A capacitor voltage dividing transformer 11 main circuit conductor 12 insulator cylinder 13, 23 intermediate electrode 14 insulating film 15 ground electrode

Claims (7)

  1. 　高電圧が印加される、軸方向に延伸する主回路導体と、
    　前記主回路導体の外側に、前記主回路導体と同軸に配される、円筒形状を有する絶縁体円筒と、
    　前記絶縁体円筒の外側の少なくとも一部を被覆する中間電極と、
    　前記中間電極を覆う絶縁膜と、
    　前記絶縁膜の少なくとも一部を覆う接地電極と、を備えるコンデンサ分圧形変成器。     an axially extending main circuit conductor to which a high voltage is applied;
    an insulator cylinder having a cylindrical shape disposed outside the main circuit conductor and coaxial with the main circuit conductor;
    an intermediate electrode covering at least a portion of the outside of the insulator cylinder;
    an insulating film covering the intermediate electrode;
    and a ground electrode covering at least part of the insulating film.
  2. 　前記中間電極は、前記主回路導体の周方向に周回する閉ループを含まない請求項１に記載のコンデンサ分圧形変成器。 The capacitor voltage dividing transformer according to claim 1, wherein the intermediate electrode does not include a closed loop that circulates in the circumferential direction of the main circuit conductor.
  3. 　前記周方向における前記中間電極の長さは、前記周方向における前記絶縁体円筒の長さよりも短い請求項２に記載のコンデンサ分圧形変成器。 The capacitor voltage dividing transformer according to claim 2, wherein the length of the intermediate electrode in the circumferential direction is shorter than the length of the insulator cylinder in the circumferential direction.
  4. 　前記軸方向における前記接地電極の長さは、前記軸方向における前記中間電極の長さよりも長い請求項１から３のいずれか１項に記載のコンデンサ分圧形変成器。 The capacitor voltage dividing transformer according to any one of claims 1 to 3, wherein the length of the ground electrode in the axial direction is longer than the length of the intermediate electrode in the axial direction.
  5. 　請求項１から４のいずれか１項に記載のコンデンサ分圧形変成器と、
    　前記コンデンサ分圧形変成器を収容する容器とを備える電圧変成装置。     a capacitor voltage dividing transformer according to any one of claims 1 to 4;
    and a vessel containing the capacitor voltage divider transformer.
  6. 　前記主回路導体が互いに別個である３つの前記コンデンサ分圧形変成器を備え、
    　前記容器は、３つの前記コンデンサ分圧形変成器を収容する請求項５に記載の電圧変成装置。     three said capacitor voltage divider transformers, wherein said main circuit conductors are separate from each other;
    6. A voltage transformer as claimed in claim 5, wherein said container houses three said capacitor voltage divider transformers.
  7. 　前記軸方向における前記絶縁体円筒の両端に固定される取付板をさらに備え、
    　前記取付板が前記容器に取り付けられることで前記絶縁体円筒が前記容器に固定される請求項５または６に記載の電圧変成装置。     further comprising a mounting plate fixed to both ends of the insulator cylinder in the axial direction;
    7. A voltage transformer according to claim 5, wherein said insulator cylinder is fixed to said container by attaching said mounting plate to said container.
PCT/JP2022/009296 2022-03-04 2022-03-04 Capacitor voltage-dividing type transformer and voltage transformation apparatus WO2023166687A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0282166A (en) * 1988-09-20 1990-03-22 Matsushita Electric Ind Co Ltd Voltage divider
JPH02115770A (en) * 1988-10-26 1990-04-27 Toshiba Corp Voltage detector for three-phase collective type gas insulated electric apparatus
JPH06258353A (en) * 1993-03-03 1994-09-16 Toshiba Corp Transformer for meter in application of optics

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0282166A (en) * 1988-09-20 1990-03-22 Matsushita Electric Ind Co Ltd Voltage divider
JPH02115770A (en) * 1988-10-26 1990-04-27 Toshiba Corp Voltage detector for three-phase collective type gas insulated electric apparatus
JPH06258353A (en) * 1993-03-03 1994-09-16 Toshiba Corp Transformer for meter in application of optics

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