JP6984706B1 - Vacuum capacitor type instrument transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small capacitor type instrument transformer capable of shielding electromagnetic force and performing high-precision measurement. SOLUTION: A vacuum capacitor 2 constituting a main capacitor (or a part of the main capacitor) and a voltage dividing capacitor are provided, and a desired voltage measurement is performed by dividing the pressure of the vacuum capacitor 2 and the voltage dividing capacitor. The configuration is such that it is possible. In the vacuum capacitor 2, the insulating cylinder opening 4a on one side in the axial direction of the insulating cylinder 4 is closed by the high-voltage portion 5, and the insulating cylinder opening 4b on the other side in the axial direction is closed by the grounding portion 6. The vacuum vessel 20 is configured. A pressure dividing portion 8 is insulatedly supported at a position of the grounding portion 6 inside the vacuum vessel 20 facing the high pressure portion 5 via a tubular insulating support portion 7 extending in the axial direction. As a result, the high-voltage portion 5, the grounding portion 6, and the voltage dividing portion 8 of the vacuum capacitor 2 are insulated from each other, and the outer peripheral side of the voltage dividing portion 8 is covered by the high-voltage portion 5 and the grounding portion 6. [Selection diagram] Fig. 2

Description

The present invention relates to a transformer for a capacitor type measuring instrument capable of measuring a voltage by dividing a voltage between a main capacitor on the primary side and a voltage dividing capacitor on the secondary side.

As is well known, a voltage transformer (VT: Voltage Transformers) is used to convert a high voltage into a safe voltage by a voltage dividing circuit and input it to a measuring instrument such as a voltmeter or a protective relay. Several methods such as winding type, capacitor type, and resistance type are used for this instrument transformer.

A capacitor type voltage transformer (CVT) is defined as an instrument transformer that utilizes a capacitor voltage divider, and is defined as a main capacitor between the primary line side terminal and the voltage divider point (voltage divider), and the voltage divider and ground. It is equipped with a voltage dividing capacitor between the parts and is configured so that the voltage dividing voltage can be obtained by a CVT transformer (CVT transformer) used by connecting directly to the voltage dividing capacitor or through a resonance reactor and connecting them in parallel. ing. As for this capacitor type instrument transformer, for example, Patent Document 1 and Non-Patent Document 1 are known.

Japanese Patent No. 5476524

"Instrument transformer" JEC-1201-2007, Denki Shoin Co., Ltd., 2007, p. 75-76 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

Since the voltage dividing portion of the conventional capacitor-type instrument transformer is not covered with metal, for example, an electromagnetic wave from the outside may affect the voltage dividing portion, making high-precision measurement difficult. On the other hand, for high-precision measurement, for example, if the outer peripheral side of the voltage dividing portion is separately covered with metal, it may be difficult to achieve both miniaturization in the outer diameter direction and high withstand voltage.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a transformer for a capacitor type instrument that can shield electromagnetic force and perform high-precision measurement and contribute to miniaturization. ..

The capacitor-type voltage transformer according to the present invention can contribute to solving the above-mentioned problems, and one aspect thereof includes a vacuum capacitor on the primary side and a capacitor on the secondary side, and the voltage division of both capacitors is provided. It is a capacitor-type voltage transformer for measuring instruments that can measure voltage by means of.

The vacuum capacitor includes a vacuum vessel in which the opening of the insulating cylinder on one side in the axial direction of the insulating cylinder is closed by a high-pressure portion and the opening of the insulating cylinder on the other side in the axial direction is closed by a grounding portion. It has a pressure dividing portion supported by a tubular insulating support portion extending in the axial direction at a position facing the high pressure portion inside the vacuum vessel in the grounding portion.

The high-voltage portion extends from the inside of the vacuum container of the high-voltage terminal to the other side in the axial direction, and the inner peripheral side of the insulating cylinder is the axial center. It has a high voltage electrode that penetrates in the direction.

The grounding portion is connected coaxially with the insulating cylinder to the opening of the insulating cylinder on the other side, and surrounds the outer peripheral side of the tip end portion on the extension direction side of the high voltage electrode and the outer peripheral side of the voltage dividing portion. It has a grounding cylinder and a grounding terminal for closing the opening of the grounding cylinder on the other side in the axial direction of the grounding cylinder.

Then, the pressure dividing portion includes a pressure dividing electrode that closes the opening of the supporting portion on one side in the axial center direction of the insulating support portion, and extends from the pressure dividing electrode to the other side in the axial center direction. It is characterized by having a voltage dividing terminal that penetrates the inner peripheral side of the insulating support portion and the ground terminal in the axial direction.

Further, a tubular insulating cylinder side shield portion that surrounds both the outer peripheral side of the high voltage electrode and the outer peripheral side of the pressure dividing portion is provided, and the insulating cylinder side shield portion includes both of the above and the grounding cylinder. It may be characterized in that it is located between and supported by the insulating cylinder.

Further, the insulating cylinder has a multi-stage structure divided into a plurality of tubular bodies in the axial direction, and the insulating cylinder side shield portion is a support portion protruding from the insulating cylinder side shield portion to the outer peripheral side. The support portion may be characterized in that it is sandwiched between two adjacent tubular bodies in the insulating cylinder.

Further, two or more insulating cylinder-side shield portions having different diameters are arranged concentrically between the two and the grounding cylinder in a non-contact manner, and the insulating cylinder has the number of tubular bodies. It has a multi-stage structure having more than the shield portion on the insulating cylinder side, and may be characterized in that the support portion of each shield portion on the insulating cylinder side is sandwiched between different tubular bodies in the insulating cylinder.

Further, the tubular grounding cylinder side shield portion extending from one side of the grounding cylinder in the axial direction to one side in the axial direction along the inner peripheral surface of the insulating cylinder is the insulating cylinder. It may be characterized in that it is interposed with the shield portion on the insulating cylinder side in a non-contact manner.

Further, on the outer peripheral side of the voltage dividing portion inside the vacuum vessel in the grounding portion, a tubular pressure dividing portion side shield extending from the grounding portion to one side in the axial direction and surrounding the voltage dividing portion. It may be characterized in that the portion is provided.

Further, the other side of the shield portion on the insulating cylinder side in the axial direction may be characterized in that it is formed in a ring shape or in a shape in which the other side is bent toward the outer peripheral side.

As shown above, according to the present invention, it is possible to provide a small capacitor-type instrument transformer capable of shielding electromagnetic force and performing high-precision measurement.

Schematic external view of the schematic configuration of the vacuum capacitor type instrument transformer 1 according to the embodiment (external view with a cross section of the housing 30). A vertical cross-sectional view showing a schematic configuration of the vacuum condenser 2 (a vertical cross-sectional view in the axial direction of the vacuum vessel 20). An equivalent circuit diagram for explaining the vacuum capacitor type instrument transformer 1 (equivalent circuit diagram when the shield portion 91 on the insulating cylinder side is provided).

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

That is, the vacuum capacitor type instrument transformer of the present embodiment includes a vacuum capacitor on the primary side and a capacitor on the secondary side, and has a configuration capable of measuring voltage by dividing the voltage of both capacitors. In the vacuum capacitor, the opening of the insulating cylinder on one side (hereinafter, simply referred to as one side of the axial center) in the insulating cylinder in the axial center direction (hereinafter, simply referred to as the axial center direction) is closed by the high pressure portion. It is assumed that a vacuum vessel is provided in which the opening of the insulating cylinder on the other side in the axial direction (hereinafter, appropriately referred to as the other side of the axial center) is closed by the grounding portion. Then, the pressure dividing portion is insulated and supported via a cylindrical insulating support portion extending in the axial direction at a position facing the high pressure portion inside the vacuum vessel in the grounding portion.

According to the vacuum capacitor type instrument transformer having such a configuration, the high voltage part, the grounding 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 grounding part. It will be in a state of being. As a result, for example, the influence of electromagnetic waves that can enter from the outside of the vacuum container (hereinafter, simply referred to as external electromagnetic waves) (for example, the influence on the voltage dividing portion) can be suppressed, and high-precision measurement becomes possible.

As a result, even if the outer peripheral side of the voltage dividing portion is not separately covered with metal, a small size and a large capacitance can be obtained, and the influence of high voltage electromagnetic rupture can be suppressed, and in this respect, the size is reduced. And high withstand voltage can be achieved at the same time.

In the vacuum capacitor type voltage transformer of the present embodiment, as described above, the high voltage portion, the grounding portion, and the voltage dividing portion of the vacuum capacitor are insulated from each other, and the outer peripheral side of the voltage dividing portion is covered by the high voltage portion and the grounding portion. Any aspect may be used as long as it is in a broken state, and technical common knowledge in various fields (for example, fields such as transformers, measuring instruments, protective relays, vacuum capacitors, etc.) is appropriately applied, and prior art documents and the like are appropriately referred to as necessary. It is possible to modify the design with reference to it, and the following examples can be given as an example. In FIGS. 1 to 3, detailed description will be omitted as appropriate by quoting the same reference numerals for the same contents.

<< Example >>
<Configuration example of vacuum capacitor type instrument transformer>
FIG. 1 illustrates a schematic configuration of a vacuum capacitor type instrument transformer 1 according to an embodiment. The vacuum capacitor type voltage transformer 1 includes a vacuum capacitor 2 constituting a main capacitor (or a part of the main capacitor) and a voltage dividing capacitor 3, and the vacuum capacitor 2 and the voltage dividing capacitor 3 are provided. By dividing the voltage, it is possible to measure the desired voltage.

The voltage dividing capacitor 3 is, for example, a vacuum capacitor, a film capacitor, or the like, and is provided in the housing 30. Further, an output terminal 31 is connected to a common connection point between the vacuum capacitor 2 and the voltage dividing capacitor 3. Although not shown, a resonance reactor, a transformer, or a voltage detection unit is appropriately equipped in parallel with the voltage dividing capacitor 3, and a transformation device unit that converts these outputs into a required output form is also appropriately equipped.

<Vacuum capacitor 2 configuration example>
FIG. 2 illustrates the schematic configuration of the vacuum capacitor 2. In the vacuum capacitor 2 of FIG. 2, the insulating cylinder opening 4a on one side of the shaft center of the insulating cylinder 4 is closed by the high pressure portion 5, and the insulating cylinder opening 4b on the other side of the shaft center is closed by the grounding portion 6 to form a vacuum. A vacuum vessel 20 capable of maintaining the state is configured.

In the case of the vacuum vessel 20 in the figure, the opening edge surface of the insulating cylinder opening 4b is joined to the reduced diameter portion 6a described later, whereby the diameter is gradually expanded from one side of the axis to the other side of the axis. It has the appearance shape that is being used.

In the case of the insulating cylinder 4 in the figure, it is divided into a plurality of tubular bodies 40 (two tubular bodies 40a and 40b in FIG. 2) in the axial direction, and each of the tubular bodies 40 is coaxial and has a shaft. It has a multi-stage structure that is connected in the direction of the center. As a result, the insulating cylinder side shield portion 91, which will be described later, can be sandwiched between the two adjacent tubular bodies 40.

The high-voltage portion 5 has a flat plate-shaped high-voltage terminal 51 that closes the insulating cylinder opening 4a, and a high-voltage electrode 52 that extends 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 configuration in which the inner peripheral side of the insulating cylinder 4 is penetrated in the axial direction, and the tip portion 52a on the extending direction side of the high-voltage electrode 52 protrudes from the inner peripheral side of the insulating cylinder 4. It has become. In the case of the tip portion 52a in the figure, the diameter of the high-voltage electrode 52 is larger than that of the tip portion 52a other than the tip portion 52a. In the high voltage terminal 51, for example, a bus or the like (not shown) is connected.

The grounding portion 6 is a flat plate-shaped grounding portion that closes the grounding cylinder 61 coaxially connected to the insulating cylinder 4 with respect to the insulating cylinder opening 4b and the grounding cylinder opening 6b on the other side of the axis of the grounding cylinder 61. It has a terminal 62 and. The grounding cylinder 61 is configured to surround (non-contactly surround) the outer peripheral side of the tip portion 52a of the high voltage electrode 52 and the outer peripheral side of the voltage dividing portion 8 described later.

In the case of the grounding cylinder 61 in the figure, the diameter is reduced to the inside of the vacuum vessel 20 in the radial direction (the direction tolerate the axial center direction; hereinafter, simply referred to as the radial direction) on one side of the axial center of the grounding cylinder 61. A reduced diameter portion 6a is formed. The reduced diameter portion 6a and the insulating cylinder opening 4b are joined to close the insulating cylinder opening 4b.

A through hole 62a having a shape capable of penetrating the voltage dividing terminal 82 described later in the axial direction is provided at a position of the ground terminal 62 inside the vacuum vessel 20 facing the high voltage portion 5. On the opening edge surface inside the vacuum vessel 20 in the through hole 62a, a tubular insulating support portion 7 extending in the axial direction is provided coaxially with the through hole 62a. The pressure dividing portion 8 is insulatedly supported inside the vacuum vessel 20 in the ground terminal 62 via the insulating support portion 7.

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

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

The high-voltage section 5, the grounding section 6, and the voltage dividing section 8 are insulated from each other by the vacuum capacitor 2 as described above, and the outer peripheral side of the voltage dividing section 8 is covered by the high-voltage section 5 and the grounding section 6. be able to. As a result, the influence of the external electromagnetic wave on the voltage dividing portion 8 can be suppressed.

<Configuration examples of various shields>
The breakdown voltage in the vacuum vessel 20 of the vacuum capacitor 2 depends on, for example, the distance between the electrodes in the vacuum vessel 20 in addition to the electric field strength. When the distance between the electrodes is within a predetermined numerical range, the breakdown voltage is assumed to change in proportion to the distance between the electrodes.

However, when the distance between the electrodes exceeds a predetermined numerical range, the proportional relationship cannot be maintained. That is, it is known that as the distance between electrodes increases beyond a predetermined numerical range, the degree of increase in the dielectric breakdown voltage gradually decreases, and the dielectric breakdown electric field strength tends to decrease (for example, non-patented). See FIG. 3 of Document 2).

Therefore, when there is such a tendency, various shield portions may be appropriately arranged in the vacuum vessel 20 to appropriately shorten the distance between the electrodes to improve the electric field characteristics. As an example thereof, the insulating cylinder side shield portion 91, the grounding cylinder side shield portion 92, the voltage dividing portion side shield portion 93, and the like as shown in FIG. 2 may be provided.

The shield portion 91 on the insulating cylinder side in FIG. 2 has a tubular 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, simply referred to as the high voltage portion and the outer peripheral side of the voltage dividing portion). Therefore, the high-voltage portion / partial pressure portion is interposed between the outer peripheral side and the grounding cylinder 61 in a non-contact manner, and is insulated and supported by the insulating cylinder 4.

In the case of the insulating cylinder side shield portion 91 in the figure, a support portion 91a having a shape protruding outward in the radial direction is provided on one side of the axis of the insulating cylinder side shield portion 91. By sandwiching the support portion 91a between two adjacent tubular bodies, the insulating cylinder side shield portion 91 is insulatedly supported.

When such an insulating cylinder side shield portion 91 is provided, the distance between the electrodes related to both the high voltage portion / voltage dividing portion outer peripheral side and the grounding cylinder 61 can be shortened, and the insulating cylinder side shield portion 91 is not provided. It is possible to obtain the same electric field strength.

In the vacuum capacitor type instrument transformer 1 when the insulating cylinder side shield 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. Further, in the shield portion 91 on the insulating cylinder side, the capacitances C2, C3, and C4 are formed between the high voltage portion 5, the ground contact portion 6, and the voltage dividing portion 8, respectively, and the space capacitance C0 is formed. Will be done.

Here, in the shield portion 91 on the insulating cylinder side, the voltage is divided by the capacitances C2 and C3 between the high voltage portion 5 and the grounding portion 6, and the potential becomes an intermediate potential. Therefore, by making the capacitances C2 and C3 larger than the spatial capacitance C0, the influence of external electromagnetic waves can be suppressed, which can contribute to the realization of highly accurate measurement.

Next, the grounding cylinder side shield portion 92 has a tubular shape extending from the diameter-reduced portion 6a on one side of the shaft center of the grounding cylinder 61 to one side of the shaft center along the inner peripheral surface of the insulating cylinder 4. It is configured to be interposed between the insulating cylinder 4 and the shield portion 91 on the insulating cylinder side in a non-contact manner.

When such a grounding cylinder side shield portion 92 is provided, it is possible to suppress the influence of external electromagnetic waves on the insulating cylinder side shield portion 91 and contribute to the realization of more accurate measurement.

Next, the pressure dividing portion side shield portion 93 has a tubular structure that extends from the inside of the vacuum container 20 in the ground terminal 62 to one side of the axis and surrounds the outer peripheral side of the pressure dividing portion 8. In the pressure dividing portion side shield portion 93, one side of the shaft center of the pressure dividing portion side shield portion 93 is inserted into the inner peripheral side of the other side of the shaft center of the insulating cylinder side shield portion 91, and the shield portion 93 is not in contact with each other and is in the axial center direction. It is superimposed on.

When such a pressure dividing portion side shield portion 93 is provided, the capacitance between the pressure dividing portion 8 and the insulating cylinder side shield portion 91 can be reduced, which can contribute to the realization of higher accuracy measurement. Will be.

Each of the shield portions 91 to 93 as described above can be applied in various modes depending on the target vacuum capacitor type instrument transformer 1 (for example, depending on the voltage of the high voltage portion 5). For example, any of the various shield portions 91 to 93 can be added or omitted, and various shapes can be applied.

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

In this case, the insulating cylinder 4 has a multi-stage structure in which the number of tubular bodies 40 is larger than that of the insulating cylinder side shield portion 91. As a result, there are a plurality of adjacent two tubular bodies 40 (more than the number of the insulating cylinder side shield portions 91), and the support portions of the insulating cylinder side shield portions are supported by different tubular bodies 40. It can be sandwiched and supported by insulation.

Further, the tip portion on the other side of the axis of the shield portion 91 on the insulating cylinder side may have a ring shape or a shape in which the other side (tip portion) is bent (bent and rounded) outward in the radial direction.

When the tip of the shield portion 91 on the insulating cylinder side on the other side of the axis is ring-shaped or the like as described above, the electric field strength becomes high, and the discharge arc is applied to the shield 91 on the insulating cylinder side and the grounding portion 6 at the time of discharge. By generating it and keeping the discharge arc away from the voltage dividing unit 8, it is possible to prevent the high voltage from becoming high.

<Others>
Various aspects can be applied to the material and the joining configuration of each component of the vacuum capacitor 2, and the material is not particularly limited. For example, each component may be appropriately joined by brazing or the like. In the insulating cylinder 4 and the insulating support portion 7, an insulating material such as a ceramic material may be applied.

Further, by using a magnetic material for a part or the whole component of the high-voltage portion 5, the grounding portion 6, and the voltage dividing portion 8, stronger electromagnetic countermeasures can be taken. For example, a sufficient magnetic shielding effect can be obtained by forming a part or all of the high-pressure portion 5, the ground portion 6, and the partial pressure division 8 with a known soft magnetic material such as iron, stainless steel, and nickel alloy. Can be done.

Further, by forming a part or the whole component of the high voltage portion 5, the grounding portion 6, and the voltage dividing portion 8 with a soft magnetic material and a material having low electric resistance, the magnetic shielding effect is further improved. The same effect can be obtained by forming a thin film of these magnetic materials on the high-pressure portion 5, the ground contact portion 6, and the pressure-dividing portion 8 by plating or the like.

Although the above description has been made in detail only for the specific examples described in the present invention, it is clear to those skilled in the art that various changes and the like can be made within the scope of the technical idea of the present invention. It goes without saying that such changes belong to the scope of claims.

1 ... Vacuum capacitor type Instrument transformer 2 ... Vacuum capacitor 20 ... Vacuum container 3 ... Pressure dividing capacitor 4 ... Insulation cylinder 5 ... High voltage part 6 ... Grounding part 7 ... Insulating support part 8 ... Pressure dividing part 91-93 ... Shield Department

Claims (7)

It is a capacitor-type measuring instrument transformer that has a vacuum capacitor on the primary side and a capacitor on the secondary side and can measure voltage by dividing the voltage of both capacitors.
The vacuum condenser is
A vacuum vessel in which the opening of the insulating cylinder on one side in the axial direction of the insulating cylinder is closed by the high-pressure portion and the opening of the insulating cylinder on the other side in the axial direction is closed by the grounding portion.
The grounded portion has a pressure dividing portion supported by a tubular insulating support portion extending in the axial direction at a position facing the high pressure portion inside the vacuum vessel.
The high pressure part is
A high-voltage terminal that closes the opening of the insulating cylinder on one side,
It has a high-voltage electrode extending from the inside of the vacuum vessel of the high-voltage terminal to the other side in the axial direction and penetrating the inner peripheral side of the insulating cylinder in the axial direction.
The grounding part is
A grounding cylinder that is connected coaxially with the insulating cylinder to the opening of the insulating cylinder on the other side and surrounds the outer peripheral side of the tip end portion on the extension direction side of the high voltage electrode and the outer peripheral side of the voltage dividing portion. When,
It has a grounding terminal that closes the opening of the grounding cylinder on the other side in the axial direction of the grounding cylinder.
The pressure dividing part is
A voltage dividing electrode that closes the opening of the support portion on one side in the axial direction of the insulating support portion, and a pressure dividing electrode.
It has a voltage dividing terminal extending from the voltage dividing electrode to the other side in the axial center direction and penetrating the inner peripheral side of the insulating support portion and the grounding terminal in the axial center direction. A featured vacuum capacitor type instrument transformer. It is provided with a cylindrical insulating cylinder-side shield portion that surrounds both the outer peripheral side of the high-voltage electrode and the outer peripheral side of the voltage dividing portion.
The vacuum capacitor type instrument transformer according to claim 1, wherein the shield portion on the insulating cylinder side is located between the two and the grounding cylinder and is supported by the insulating cylinder. The insulating cylinder has a multi-stage structure divided into a plurality of tubular bodies in the axial direction.
The insulating cylinder side shield portion has a support portion protruding from the insulating cylinder side shield portion to the outer peripheral side, and the support portion is sandwiched between two adjacent tubular bodies in the insulating cylinder. The vacuum capacitor type instrument transformer according to claim 2. Two or more shields on the insulating cylinder side having different diameters are arranged concentrically with each other in a non-contact manner between the two and the grounding cylinder.
The insulating cylinder has a multi-stage structure in which the number of tubular bodies is larger than that of the shield portion on the insulating cylinder side.
The vacuum capacitor type instrument transformer according to claim 3, wherein the support portion of each insulating cylinder side shield portion is sandwiched between different tubular bodies in the insulating cylinder. The tubular grounding cylinder side shield portion extending from one side of the grounding cylinder in the axial direction to one side in the axial direction along the inner peripheral surface of the insulating cylinder is the insulating cylinder and the insulating cylinder. The transformer for a vacuum capacitor type instrument according to any one of claims 2 to 4, wherein the transformer is interposed with the side shield portion in a non-contact manner. The invention according to any one of claims 2 to 5 , wherein the other side of the shield portion on the insulating cylinder side in the axial direction is formed in a ring shape or a shape in which the other side is bent toward the outer peripheral side. Vacuum capacitor type instrument transformer. Inside the vacuum vessel in the grounding portion, on the outer peripheral side of the voltage dividing portion, there is a tubular pressure dividing portion side shield portion extending from the grounding portion to one side in the axial direction and surrounding the voltage dividing portion. The vacuum capacitor type instrument transformer according to any one of claims 1 to 6, wherein the transformer is provided.

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