TW202213406A - Vacuum-capacitor-type voltage transformer - Google Patents

Abstract

The present invention comprises a vacuum capacitor (2) that constitutes a main capacitor (or a part of a main capacitor), and a voltage-dividing capacitor, a configuration being attained with which it is possible to perform a desired voltage measurement using the voltage division of the vacuum capacitor (2) and the voltage-dividing capacitor. In the vacuum capacitor (2), an insulated tube opening (4a) on one side in the axial center direction of an insulated tube (4) is closed by a high-voltage part (5), and the insulated tube opening (4b) on the other side in the axial center direction is closed by a ground part (6), and a vacuum container (20) is constituted. A voltage division part (8) is insulated and supported, by a tubular insulating support part (7) extended in the axial center direction, in a position facing the high-voltage part (5) on the inner side of the vacuum container (20) at the ground part (6). The high-voltage part (5), ground part (6), and voltage-division part (8) of the vacuum capacitor (2) are thereby insulated from each other, and the outer circumferential side of the voltage-division part (8) is covered by the high-voltage part (5) and the ground part (6).

Description

Vacuum Capacitor Voltage Comparator

The present invention relates to a capacitive voltage comparator capable of measuring voltage by dividing the voltage between the main capacitor on the primary side and the voltage dividing capacitor on the secondary side.

As is well known, voltage transformers (VT: Voltage Transformers) are used to convert a high voltage into a safe voltage by a voltage divider circuit and input it to a measuring device such as a voltmeter and a protective relay. For this voltage comparator, several methods such as coil type, capacitor type, and resistance type are used.

Capacitive voltage comparator (CVT) is defined as a voltage divider using capacitive voltage divider. The voltage-dividing capacitor is configured to obtain a voltage-divided voltage by connecting the voltage-dividing capacitor directly or through a resonant reactor in parallel with a CVT transformer (CVT transformer) used. Regarding this capacitance-type voltage comparator, for example, Patent Document 1 and Non-Patent Document 1 are known. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 5476524 [Non-patent literature]

[Non-Patent Document 1] "Ratio Converter" JEC-1201-2007, Electric Shoin Co., Ltd., 2007, p.75-76 [Non-Patent Document 2] P.Spolaore, G. Bisoffi, F. Cervellera, R. Pengo , F. Scarpa, The Large Gap Case for HV Insulation in Vacuum, IEEE Transactions on Dielectrics and Electrical Insulation Vol. 4 No. 4, August 1997

In the conventional capacitor-type voltage comparator, the voltage dividing part is not covered with metal, so for example, electromagnetic waves from the outside may affect the voltage dividing part, and it may be difficult to perform high-precision measurement. On the other hand, for high-precision measurement, for example, if the outer peripheral side of the voltage dividing portion is covered with another metal, it may be difficult to achieve both miniaturization in the outer diameter direction and higher withstand voltage.

The present invention has been made in order to solve such a conventional problem, and the problem to be solved is to provide a capacitive voltage comparator capable of shielding electromagnetic force, capable of performing high-precision measurement, and contributing to miniaturization.

The capacitance-type voltage comparator of the present invention can contribute to the solution of the above-mentioned problems. It has a vacuum capacitor on the primary side and a capacitor on the secondary side. Capacitive voltage comparator.

The vacuum capacitor has a vacuum container in which the opening of the insulating cylinder on one side in the axial direction of the insulating cylinder is closed by a high voltage portion, and the opening of the insulating cylinder on the other side in the axial direction of the insulating cylinder is closed by a ground portion, and The position where the inner side of the vacuum container of the grounding portion faces the high pressure portion is a pressure dividing portion supported by a cylindrical insulating support portion extending in the axial direction.

The high-voltage part includes a high-voltage terminal that closes the opening of the insulating cylinder on the one side, and a high-voltage terminal extending from the inside of the vacuum container of the high-voltage terminal to the other side in the axial center direction and penetrating the insulating cylinder in the axial center direction. High voltage electrode on the inner peripheral side.

The grounding portion includes an opening portion of the insulating cylinder on the other side, which is continuously provided coaxially with the insulating cylinder, and surrounds the outer peripheral side of the front end portion on the extending direction side of the high-voltage electrode and the outer peripheral side of the voltage dividing portion. The grounding cylinder and the grounding terminal that blocks the opening of the grounding cylinder on the other side in the axial center direction of the grounding cylinder.

Then, the voltage dividing portion includes a voltage dividing electrode that blocks the opening of the support portion on one side of the axial center direction of the insulating support portion, and a voltage dividing electrode extending from the voltage dividing electrode to the other side in the axial center direction. a voltage dividing terminal penetrating through the inner peripheral side of the insulating support portion and the ground terminal in the axial direction.

In addition, a cylindrical insulating cylinder side shielding portion is provided which surrounds both the outer peripheral side of the high-voltage electrode and the outer peripheral side of the voltage dividing portion, and the insulating cylinder side shielding portion is located between the two and the grounding cylinder, It may be supported by the aforementioned insulating cylinder.

In addition, the insulating cylinder has a multi-stage structure divided into a plurality of cylindrical bodies with respect to the axial center direction; The part may be held between two adjacent cylindrical bodies of the insulating cylinder.

In addition, two or more of the shielding parts on the insulating cylinder side with different diameters are connected between the two and the grounding cylinder, and are arranged concentrically in a non-contact manner with each other; the insulating cylinder is an individual part of the cylindrical body. The number of multi-stage structures is greater than that of the shielding portions on the insulating cylinder side; the support portions of the shielding portions on the insulating cylinder side may be held between cylindrical bodies different from the insulating cylinders.

In addition, a cylindrical grounding cylinder side shielding portion extending from one side of the axial center direction of the grounding cylinder along the inner peripheral surface of the insulating cylinder to the one side of the axial center direction is interposed in the non-contact manner. It may be between the insulating cylinder and the shielding portion on the side of the insulating cylinder.

In addition, on the inner side of the vacuum container of the grounding portion, on the outer peripheral side of the partial pressure portion, there is provided a cylindrical shielding portion on the partial pressure portion side extending from the grounding portion to the one side in the axial center direction, and surrounding the partial pressure portion. Can.

Moreover, the other side of the said axial center direction of the said insulating cylinder side shielding part may be formed in a ring shape or the shape which curves the other side toward the outer peripheral side.

According to the present invention described above, it is possible to provide shielding electromagnetic force, to perform high-precision measurement, and to contribute to a miniaturized capacitive voltage comparator.

The vacuum capacitor type voltage comparator according to the embodiment of the present invention is, for example, completely different from the structure in which the outer peripheral side of the voltage dividing portion is covered only with another metal.

That is, the vacuum capacitor type voltage comparator of the present embodiment is provided with a vacuum capacitor on the primary side and a capacitor on the secondary side, and a voltage measurement can be performed by the voltage division between the two capacitors. In the vacuum capacitor, the opening portion of the insulating cylinder on one side (hereinafter only appropriately referred to as the axial side) of the insulating cylinder in the axial center direction (hereinafter referred to as the axial center direction) is blocked by the high voltage portion, and the axial center is blocked by the high voltage portion. A vacuum container in which the opening of the insulating cylinder on the other side of the direction (hereinafter, appropriately referred to as the other side of the axis) is closed by a ground portion. Then, at a position opposite to the high voltage part inside the vacuum container of the ground part, the pressure dividing part is insulated and supported through a cylindrical insulating support part extending in the axial direction.

According to the vacuum capacitor type voltage comparator of such a structure, the high voltage part, the ground part, and the voltage dividing part of the vacuum capacitor are insulated from each other, and the outer peripheral side of the voltage dividing part is covered by the high voltage part and the ground part. This makes it possible to suppress the influence of electromagnetic waves (hereinafter referred to as external electromagnetic waves, as appropriate) that can penetrate from the outside of the vacuum container (for example, the influence on the pressure divider), and to perform high-precision measurement.

As a result, it is not necessary to cover the outer peripheral side of the voltage dividing portion with a separate metal, and a small and large electrostatic capacitance can be obtained, and the influence of high-voltage electromagnetic waves can be suppressed. From this viewpoint, miniaturization and high resistance can be compatible. voltage.

The vacuum capacitor type voltage comparator of the present embodiment is as described above, as long as the high voltage part, the ground part and the voltage dividing part of the vacuum capacitor are insulated from each other, and the outer periphery of the voltage dividing part is covered by the high voltage part and the ground part. The state of the side is sufficient, and the technical knowledge in various fields (such as transformers, measuring instruments, protective relays, vacuum capacitors, etc.) can be appropriately applied, and design changes can be made according to needs by referring to prior art documents, etc., As an example, the following Example is mentioned. In addition, in FIG. 1-FIG. 3, regarding mutually the same content, the same code|symbol is attached|subjected, and a detailed description is abbreviate|omitted suitably.

"Example" <Construction example of vacuum capacitor type voltage comparator> FIG. 1 illustrates a schematic configuration of a vacuum capacitor type voltage comparator 1 according to an embodiment. The vacuum capacitor type voltage comparator 1 includes a vacuum capacitor 2 and a voltage dividing capacitor 3 constituting a main capacitor (or a part of the main capacitor), and a desired voltage can be performed by the voltage division of the vacuum capacitor 2 and the voltage dividing capacitor 3 Voltage measurement.

The voltage dividing capacitor 3 is, for example, a vacuum capacitor, a film capacitor, or the like, and is provided in the casing 30 . Moreover, the output terminal 31 is connected to the common connection point of the vacuum capacitor 2 and the voltage dividing capacitor 3 . Although not shown in the drawings, a resonant reactor, a transformer, or a voltage detection unit is appropriately provided in parallel with the voltage dividing capacitor 3, and is also appropriately provided in the transformer unit that converts these outputs into a required output form.

<Structure example of vacuum capacitor 2> FIG. 2 illustrates a schematic structure of the vacuum capacitor 2 . In the vacuum capacitor 2 of FIG. 2, the insulating cylinder opening 4a on one side of the axis of the insulating cylinder 4 is closed by the high voltage part 5, and the insulating cylinder opening 4b on the other side of the axis is closed by the grounding part 6, so that the The vacuum container 20 is kept in a vacuum state.

In the state of the vacuum container 20 shown in the figure, the opening edge surface of the opening portion 4b of the insulating cylinder is joined to the diameter-reduced portion 6a, which will be described later, thereby increasing the diameter in a stepwise manner from one side of the axis to the other side of the axis. Appearance shape.

In the state of the insulating cylinder 4 in the figure, it is divided into a plurality of cylindrical bodies 40 (two cylindrical bodies 40 a and 40 b in FIG. 2 ) with respect to the axial center direction, and the cylindrical bodies 40 are connected coaxially. A multi-segment structure placed in the direction of the axis. Thereby, it becomes a structure which can hold|maintain the insulating cylinder side shielding part 91 mentioned later by between the adjacent two cylindrical bodies 40. As shown in FIG.

The high voltage part 5 has a flat high voltage terminal 51 which closes the opening 4a of the insulating cylinder, and a high voltage electrode 52 extending from the inside of the vacuum vessel 20 of the high voltage terminal 51 to the other side of the axis. The high voltage electrode 52 has a structure that penetrates through the inner peripheral side of the insulating cylinder 4 in the axial direction, and a front end portion 52a of the high voltage electrode 52 in the extending direction protrudes from the inner peripheral side of the insulating cylinder 4 . In the state of the front end portion 52 a in the figure, the high-voltage electrode 52 has a spherical shape with a larger diameter than those other than the front end portion 52 a of the high-voltage electrode 52 . The high-voltage terminal 51 is, for example, connected to a bus bar not shown in the figure.

The grounding portion 6 includes a grounding cylinder 61 coaxially and continuously provided with the insulating cylinder 4 for the insulating cylinder opening 4b, and a flat-shaped grounding terminal that closes the grounding cylinder opening 6b on the other side of the axial center of the grounding cylinder 61. 62. The grounding cylinder 61 is configured to surround (in a non-contact manner) the outer peripheral side of the front end portion 52 a of the high-voltage electrode 52 and the outer peripheral side of the pressure dividing portion 8 after the operation.

In the state of the grounding cylinder 61 shown in the figure, on one side of the axial center of the grounding cylinder 61, a diameter reduction is formed toward the inner side of the radial direction of the vacuum container 20 (the direction of tolerance with the axial center direction; hereinafter referred to as the radial direction as appropriate). The reduced diameter portion 6a. The diameter-reduced portion 6a and the insulating cylinder opening 4b are joined to block the insulating cylinder opening 4b.

A through hole 62a having a shape that can penetrate in the axial direction of the pressure dividing terminal 82 described later is provided at a position facing the high voltage portion 5 inside the vacuum container 20 of the ground terminal 62 . A cylindrical insulating support portion 7 extending in the axial direction is provided on the opening edge surface of the through hole 62a on the inner side of the vacuum container 20 coaxially with the through hole 62a. The voltage dividing portion 8 is insulated and supported inside the vacuum container 20 of the ground terminal 62 through the insulating support portion 7 .

The voltage dividing portion 8 includes a voltage dividing electrode 81 that closes the support portion opening 7a on one side of the axial center of the insulating support portion 7, and a voltage dividing terminal 82 extending from the voltage dividing electrode 81 to the other side of the axial center. The voltage dividing terminal 82 penetrates the inner peripheral side of the insulating support portion 7 and the through hole 62 a in the axial direction, protrudes toward the outer peripheral side of the vacuum vessel 20 , and is connectable to the voltage dividing capacitor 3 and the output terminal 31 .

The voltage dividing portion 8 is located at a position spaced apart from the high voltage electrode 52 of the high voltage portion 5 by a predetermined distance, and is thereby insulated from the high voltage portion 5 by vacuum. Then, between the high voltage portion 5 and the voltage dividing portion 8 , the main capacitor (main capacitor C1 in FIG. 3 described later) of the vacuum capacitor 2 is formed.

With the above-described vacuum capacitor 2 , the high-voltage portion 5 , the ground portion 6 , and the voltage dividing portion 8 can be isolated from each other, and the outer peripheral side of the voltage-dividing portion 8 can be covered by the high-voltage portion 5 and the ground portion 6 . . Thereby, the influence of the external electromagnetic wave on the voltage dividing part 8 can be suppressed.

<Structure example of various shielding parts> The breakdown voltage in the vacuum container 20 of the vacuum capacitor 2 depends on, for example, the distance between electrodes of the vacuum container 20 in addition to the electric field strength. When the inter-electrode distance is within a predetermined value range, the breakdown voltage varies in proportion to the inter-electrode distance.

However, when the inter-electrode distance exceeds the predetermined value range, the aforementioned proportional relationship cannot be maintained. That is, as the inter-electrode distance increases beyond a predetermined numerical range, it is known that the increase in the collapse voltage gradually decreases, and the collapse electric field strength tends to decrease (for example, see FIG. 3 of Non-Patent Document 2).

Therefore, in a situation of such a tendency, various shielding parts are appropriately arranged in the vacuum container 20, and the distance between electrodes is appropriately shortened, thereby improving the electric field characteristics. As an example, the insulating cylinder side shielding part 91, the earthing cylinder side shielding part 92, the voltage dividing part side shielding part 93, etc. as shown in FIG. 2 are provided.

The insulating cylinder-side shielding portion 91 of FIG. 2 has a cylindrical shape that surrounds both the outer peripheral side of the high-voltage electrode 52 and the outer peripheral side of the voltage dividing portion 8 (hereinafter only appropriately referred to as the high-voltage portion and the outer peripheral side of the voltage dividing portion), and is not The contact method is interposed between the high voltage part, the outer peripheral side of the voltage dividing part, and the grounding cylinder 61 , and is insulated and supported by the insulating cylinder 4 .

In the state of the shielding portion 91 on the side of the insulating cylinder in the figure, on one side of the axis of the shielding portion 91 on the insulating cylinder side, a support portion 91a having a shape protruding outward in the diameter direction is provided. The supporting portion 91a is sandwiched between the two adjacent cylindrical bodies, and the shielding portion 91 on the insulating cylinder side is insulated and supported.

In the case where the insulating cylinder side shielding portion 91 is provided, the distance between the electrodes of the high voltage portion, the outer peripheral side of the voltage dividing portion, and the ground cylinder 61 can be shortened, and the same as that obtained when the insulating cylinder side shielding portion 91 is not provided. Electric field strength.

In the vacuum capacitor type voltage comparator 1 when the insulating cylinder side shielding portion 91 is provided, for example, an equivalent circuit as shown in FIG. 3 is configured. As shown in FIG. 3 , the main capacitor C1 of the vacuum capacitor 2 is formed between the high voltage portion 5 and the voltage dividing portion 8 . In addition, in the shielding portion 91 on the insulating cylinder side, in addition to the electrostatic capacitances C2 , C3 , and C4 formed between the high voltage portion 5 , the ground portion 6 , and the voltage dividing portion 8 , respectively, a space electrostatic capacitance C0 is also formed.

Here, in the shielding portion 91 on the insulating cylinder side, the voltage is divided by the electrostatic capacitances C2 and C3 between the high-voltage portion 5 and the ground portion 6 , and becomes an intermediate potential. Therefore, by setting the electrostatic capacitances C2 and C3 to be larger than the space electrostatic capacitance C0, the influence of external electromagnetic waves can be suppressed, which can contribute to the realization of high-precision measurement.

Next, the shielding portion 92 on the grounding cylinder side has a cylindrical shape extending from the diameter-reduced portion 6a on the axial center side of the grounding cylinder 61 to the axial center side along the inner peripheral surface of the insulating cylinder 4, and is formed in a non-contacting manner. A structure in which the insulating cylinder 4 and the shielding portion 91 on the insulating cylinder side are interposed.

When the shielding portion 92 on the side of the ground cylinder is provided, the influence of the external electromagnetic wave on the shielding portion 91 on the insulating cylinder side can be suppressed, which can contribute to the realization of higher-precision measurement.

Next, the shielding portion 93 on the pressure dividing portion side has a cylindrical structure extending from the inner side of the vacuum container 20 of the ground terminal 62 toward the axial center side and surrounding the outer peripheral side of the pressure dividing portion 8 . The shielding portion 93 on the voltage dividing portion side is inserted into the inner peripheral side of the shielding portion 91 on the insulating cylinder side on one side of the axial center of the shielding portion 93 on the dividing portion side, and overlaps with each other in the axial center direction in a non-contact manner. .

The provision of the shielding portion 93 on the voltage dividing portion side can reduce the electrostatic capacitance between the voltage dividing portion 8 and the shielding portion 91 on the insulating cylinder side, thereby contributing to the realization of a more accurate measurement.

In each of the shielding parts 91 to 93 as described above, the vacuum capacitor type voltage comparator 1 according to the purpose (for example, according to the voltage of the high voltage part 5 ) can be applied in various ways, for example, the various shielding parts 91 can be added or omitted. Any of ~93, or suitable for various shapes.

As a specific example, a plurality of insulating cylinder-side shielding portions 91 having different diameters may be arranged concentrically in a non-contact manner with each other between the high-voltage portion, the outer peripheral side of the voltage dividing portion, and the grounding cylinder 61 .

At this time, the insulating cylinder 4 has a multi-stage structure in which the number of the cylindrical bodies 40 is larger than that of the insulating cylinder side shielding portion 91 . As a result, there is a space between two adjacent cylindrical bodies 40 (more than the number of insulating cylinder side shielding portions 91 ), and each insulating cylinder side shield can be sandwiched between the different cylindrical bodies 40 . Part of the support part for insulation support.

In addition, the front end portion on the other side of the axial center of the insulating cylinder side shielding portion 91 may be a ring shape or a shape in which the other side (front end portion) is curved radially outward (arc curved).

As described above, when the distal end portion on the other side of the axis of the shielding portion 91 on the insulating cylinder side is formed into a ring shape, etc., the electric field intensity becomes high, and a discharge arc is generated in the shielding portion 91 on the insulating cylinder side and the ground portion 6 during discharge. , to keep the discharge arc away from the voltage divider 8 to avoid high voltage.

＜Other＞ The materials and bonding structures of the components of the vacuum capacitor 2 can be applied in various forms, and are not particularly limited. For example, among the respective constituent elements, suitable joining by welding or the like can be mentioned. For the insulating cylinder 4 and the insulating support portion 7 , materials having insulating properties, such as ceramic materials, etc., are suitable.

Furthermore, by making some or all of the components of the high voltage portion 5, the ground portion 6, and the voltage dividing portion 8 as magnetic bodies, stronger electromagnetic countermeasures can be performed. For example, a sufficient magnetic shielding effect can be obtained by forming part or all of the high voltage portion 5 , the ground portion 6 , and the voltage dividing portion 8 with a known soft magnetic material such as iron, stainless steel, and nickel alloy.

For example, the magnetic shielding effect can be further enhanced by forming the high-voltage portion 5 , the ground portion 6 , and a part or the whole of the voltage dividing portion 8 with a soft magnetic material with low electrical resistance. Furthermore, the same effects can be obtained by forming thin films of these magnetic bodies on the high voltage portion 5, the ground portion 6, and the voltage dividing portion 8 by electroplating or the like.

In the above, in the present invention, only the specific examples described are described in detail. However, it is obvious that those skilled in the art to which the present invention pertains can make various changes within the scope of the technical idea of the present invention. Such changes, of course, fall within the scope of the patent application.

1: Vacuum capacitor type voltage comparator 2: Vacuum capacitors 3: Voltage divider capacitor 4: Insulation cylinder 4a: Opening of insulating cylinder 4b: Opening of insulating cylinder 5: High Voltage Department 6: Grounding part 6a: Reduced diameter part 6b: Grounding cylinder opening 7: Insulation support part 7a: Support part opening 8: Partial pressure part 20: Vacuum container 30: Frame 31: Output terminal 40: Cylindrical body 40a: cylindrical body 40b: Cylindrical body 51: High voltage terminal 52: High voltage electrode 52a: front end 61: Grounding barrel 62: Ground terminal 62a: Through hole 81: Voltage divider electrode 82: Voltage divider terminal 91: Insulation cylinder side shield 91a: Department of Support 92: Grounding cylinder side shield 93: Pressure dividing part side shielding part C0: space electrostatic capacitance C1: Main capacitor C2: electrostatic capacitance C3: electrostatic capacitance C4: electrostatic capacitance

1 is a schematic external view (an external view showing a cross-section of the frame body 30 ) showing the schematic structure of the vacuum capacitor type voltage comparator 1 according to the embodiment. [ Fig. 2] Fig. 2 is a longitudinal sectional view (a longitudinal sectional view in the axial direction of the vacuum container 20) showing a schematic structure of the vacuum capacitor 2. [Fig. 3 is an equivalent circuit diagram for explaining the vacuum capacitor type voltage comparator 1 (equivalent circuit diagram when the insulating cylinder side shielding portion 91 is provided).

2: Vacuum capacitors

4: Insulation cylinder

4a: Opening of insulating cylinder

4b: Opening of insulating cylinder

5: High Voltage Department

6: Grounding part

6a: Reduced diameter part

7: Insulation support part

7a: Support part opening

8: Partial pressure part

20: Vacuum container

40a: cylindrical body

40b: Cylindrical body

51: High voltage terminal

52: High voltage electrode

52a: front end

61: Grounding barrel

62: Ground terminal

62a: Through hole

81: Voltage divider electrode

82: Voltage divider terminal

91: Insulation cylinder side shield

91a: Department of Support

92: Grounding cylinder side shield

93: Pressure dividing part side shielding part

Claims (7)

A vacuum capacitor type voltage comparator is a capacitor type voltage comparator which has a vacuum capacitor on the primary side and a capacitor on the secondary side, and can measure the voltage by the voltage division of the two capacitors, and is characterized by: Vacuum capacitors, which have: A vacuum container, in which the opening of the insulating cylinder on one side in the axial direction of the insulating cylinder is blocked by the high voltage portion, and the opening of the insulating cylinder on the other side in the axial direction is blocked by the ground portion; and The pressure dividing part is located at a position opposite to the high pressure part inside the vacuum container of the grounding part, and is supported by a cylindrical insulating support part extending in the axial direction; The aforesaid high-pressure part has: The high-voltage terminal blocks the opening of the insulating cylinder on the one side; and The high-voltage electrode extends from the inner side of the vacuum container of the high-voltage terminal to the other side of the axial center direction, and penetrates the inner peripheral side of the insulating cylinder in the axial center direction; The aforementioned grounding part has: A grounding cylinder is provided coaxially and continuously with the insulating cylinder with respect to the opening of the insulating cylinder on the other side, and surrounds the outer peripheral side of the front end portion on the extending direction side of the high-voltage electrode and the outer peripheral side of the voltage dividing portion; and The ground terminal blocks the opening of the ground cylinder on the other side in the axial direction of the ground cylinder; The aforementioned partial pressure part has: a voltage dividing electrode, which blocks the opening of the support part on one side of the axial center direction of the insulating support part; and The voltage dividing terminal extends from the voltage dividing electrode to the other side in the axial center direction, and penetrates the inner peripheral side of the insulating support portion and the ground terminal in the axial center direction. The vacuum capacitor type voltage comparator as described in claim 1, which has: The cylindrical insulating cylinder side shielding portion surrounds both the outer peripheral side of the high-voltage electrode and the outer peripheral side of the voltage dividing portion; The shielding portion on the side of the insulating cylinder is located between the two and the grounding cylinder, and is supported by the insulating cylinder. The vacuum capacitor type voltage comparator as described in claim 2, wherein, The above-mentioned insulating cylinder is a multi-segment structure divided into a plurality of cylindrical bodies with respect to the above-mentioned axial direction; The insulating cylinder side shielding portion has a supporting portion protruding from the insulating cylinder side shielding portion to the outer peripheral side, and the supporting portion is sandwiched between two adjacent cylindrical bodies of the insulating cylinder. The vacuum capacitor type voltage comparator as described in claim 3, wherein, Two or more of the insulating cylinder side shielding parts with different diameters are connected between the two and the grounding cylinder, and are arranged concentrically in a non-contact manner with each other; The above-mentioned insulating cylinder is a multi-stage structure in which the number of the above-mentioned cylindrical bodies is larger than that of the shielding portion on the side of the insulating cylinder; The support portions of the shielding portions on the side of each insulating cylinder are respectively held between cylindrical bodies different from the aforementioned insulating cylinders. The vacuum capacitor type voltage comparator as described in any one of claims 1 to 4, wherein, A cylindrical grounding cylinder side shielding portion extending from one side of the axial center direction of the grounding cylinder along the inner peripheral surface of the insulating cylinder to the one side of the axial center direction is inserted into the insulating cylinder in a non-contact manner. between the shielding part on the insulating cylinder side. The vacuum capacitor type voltage comparator as described in any one of claims 1 to 5, wherein, Inside the vacuum container of the ground portion, on the outer peripheral side of the partial pressure portion, there is provided a cylindrical partial pressure portion side shield extending from the ground portion to one side in the axial center direction and surrounding the partial pressure portion. The vacuum capacitor type voltage comparator as described in any one of claims 1 to 6, wherein, The other side in the axial center direction of the shielding portion on the insulating cylinder side is formed in a ring shape or a shape in which the other side is curved toward the outer peripheral side.

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