JP7040297B2 - Vacuum capacitor type instrument transformer - Google Patents

Description

The present invention relates to a vacuum capacitor type instrument transformer. In particular, the present invention relates to a vacuum capacitor type instrument transformer equipped with a vacuum capacitor as a main capacitor provided between the primary line side terminal and the voltage dividing point.

The vacuum capacitor type instrument transformer can be made smaller than the conventional instrument transformer (VT) due to the high withstand voltage of the vacuum capacitor (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-054796

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

In the conventional transformer for capacitor type instrument, it is difficult to measure with high accuracy because the electromagnetic wave from the outside affects the voltage dividing part.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum capacitor type instrument transformer in which an external influence on the shared voltage of the capacitor provided in the vacuum capacitor type instrument transformer is reduced. It is supposed to be.

One aspect of the vacuum capacitor type instrument transformer of the present invention that achieves the above object is
A vacuum capacitor type instrument transformer including a main capacitor and a voltage dividing capacitor connected in series with the main capacitor.
Of the main capacitors, the capacitor directly connected to the voltage dividing capacitor is
Insulation tube and
A high-voltage terminal provided at one end of the insulating cylinder and sealing one end of the insulating cylinder,
A tubular high-voltage electrode extending from the high-voltage terminal to the inside of the insulating cylinder,
A grounding terminal provided at the other end of the insulating cylinder and sealing the other end of the insulating cylinder,
A cylindrical ground electrode extending from the ground terminal to the inside of the insulating cylinder,
A voltage dividing electrode provided at the end of the ground electrode via an internal insulating cylinder is provided.
The end portion of the ground electrode is provided so as to extend inside the high voltage electrode without being in contact with the high voltage electrode.
The electrode shaft of the voltage dividing electrode is characterized in that it is provided by inserting the inside of the internal insulating cylinder and the ground electrode.

Further, another aspect of the vacuum condenser type instrument transformer of the present invention that achieves the above object is the vacuum condenser type instrument transformer.
The voltage dividing electrode is characterized in that it is hemispherical.

Further, another aspect of the vacuum condenser type instrument transformer of the present invention that achieves the above object is the vacuum condenser type instrument transformer.
The tip of the high-voltage electrode is characterized in that it is formed in a ring shape or by bending the tip inward to form a round shape.

Further, another aspect of the vacuum condenser type instrument transformer of the present invention that achieves the above object is the vacuum condenser type instrument transformer.
It is characterized in that the high-voltage terminal, the high-voltage electrode, the ground terminal, and a part or all of the ground electrode are made of a magnetic material.

According to the above invention, the external influence on the shared voltage of the capacitor is reduced.

It is a schematic diagram of the vacuum capacitor type instrument transformer which concerns on embodiment of this invention. It is sectional drawing of the vacuum capacitor which constitutes the main capacitor.

The vacuum capacitor type instrument transformer according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the vacuum capacitor type voltage transformer 1 according to the embodiment of the present invention includes a vacuum capacitor 2 constituting a main capacitor (or a part of the main capacitor) and a voltage dividing capacitor 3.

The voltage dividing capacitor 3 is, for example, a vacuum capacitor, a film capacitor, or the like, and is provided in the housing 4. Further, the output terminal 5 is connected to the 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 provided in parallel with the voltage dividing capacitor 3, and a transformation device unit that converts these outputs into a required output form is provided.

As shown in FIG. 2, the vacuum condenser 2 includes a high-voltage portion 6 having a high-voltage terminal 6a and a high-voltage electrode 6b, a grounding portion 7 having a grounding terminal 7a and a grounding electrode 7b, and a voltage dividing electrode 8a and a voltage dividing terminal 8b. A voltage dividing unit 8 is provided. The high-voltage portion 6 and the grounding portion 7 are insulated by the insulating cylinder 9, and the grounding portion 7 and the pressure dividing portion 8 are insulated by the insulating cylinder 10. The insulating cylinders 9 and 10 are made of, for example, ceramic or the like.

In the vacuum capacitor 2, the high voltage portion 6 or the grounding portion 7 is brazed to each end of the insulating cylinder 9, and the grounding portion 7 or the voltage dividing portion is connected to each end of the insulating cylinder 10 provided inside the insulating cylinder 9. 8 is brazed and joined. As a result, the inside of the insulating cylinder 9 is in a vacuum state.

The high-voltage terminal 6a is a plate-shaped member brazed and joined to one end of the insulating cylinder 9. A connecting portion 6c to which another vacuum capacitor constituting the main capacitor, a bus, or the like (not shown) is connected is provided in the central portion on the outside of the insulating cylinder 9 of the high voltage terminal 6a.

The high-voltage electrode 6b is provided inside the insulating cylinder 9 of the high-voltage terminal 6a. The high-voltage electrode 6b is, for example, a tubular electrode extending from the high-voltage terminal 6a to the inside of the insulating cylinder 9. The tip of the high voltage electrode 6b is formed in a ring shape. For example, the tip of the high-voltage electrode 6b is formed in a ring shape having a large thickness inward in the high-voltage electrode 6b. As a result, at the tip of the high-voltage electrode 6b, the distance between the inner peripheral surface of the high-voltage electrode 6b and the side surface of the ground electrode 7b inserted without contacting the high-voltage electrode 6b is shortened. Since the tip of the high-voltage electrode 6b may have a rounded tip and a convex shape inward, the tip of the high-voltage electrode 6b may be bent inward to form a rounded folded portion at the tip of the high-voltage electrode 6b. It may be formed.

The ground terminal 7a is a plate-shaped member that is brazed to the end of the insulating cylinder 9 on the side where the high voltage terminal 6a is not provided. A hole 7c through which the electrode shaft 8c of the voltage dividing portion 8 described in detail later is inserted is formed in the central portion of the ground terminal 7a.

The ground electrode 7b is a cylindrical electrode through which the electrode shaft 8c of the voltage dividing portion 8 can be inserted. The ground electrode 7b is provided, for example, inside the insulating cylinder 9 of the ground terminal 7a, and its tip extends into the high voltage electrode 6b without contacting the high voltage electrode 6b. An insulating cylinder 10 is provided at the end of the ground electrode 7b. The insulating cylinder 10 is erected at the end of the grounding electrode 7b so that its axis overlaps with the axis of the grounding electrode 7b, and the voltage dividing electrode 8a is brazed to the end of the insulating cylinder 10.

The voltage dividing electrode 8a is formed in a semicircular shape so as to cover the insulating cylinder 10, for example. One end of the electrode shaft 8c is joined to the inner surface of the insulating cylinder 10 of the voltage dividing electrode 8a. A voltage dividing terminal 8b is provided at the other end of the electrode shaft 8c. That is, the electrode shaft 8c is provided by inserting the insulating cylinder 10 and the ground electrode 7b, and the voltage dividing capacitor 3 and the output terminal 5 are connected to the voltage dividing terminal 8b drawn out to the outside of the vacuum capacitor 2.

According to the vacuum capacitor type instrument transformer 1 according to the embodiment of the present invention as described above, the voltage dividing electrode 8a of the pressure dividing section 8 is the grounding electrode 7b of the grounding section 7, and the high voltage electrode of the high voltage section 6. By covering with 6b, the invading portion of the electromagnetic wave coming from the outside can be reduced and the voltage dividing portion 8 can be shielded. Therefore, it is possible to prevent the influence of the electromagnetic wave on the voltage dividing portion 8 and perform high-precision measurement.

Further, by making the voltage dividing electrode 8a of the voltage dividing portion 8 covered with the high voltage electrode 6b at least hemispherical, the electric field strength applied when a high voltage is applied is reduced, and the diameters of the insulating cylinders 9 and 10 are reduced. be able to.

Further, by making the outer diameter of the ground electrode 7b smaller than the inner diameter of the tip portion of the high voltage electrode 6b, the diameter of the insulating cylinder 9 can be reduced and the vacuum capacitor 2 can be made smaller.

Further, the tip of the high-voltage electrode 6b is formed in a ring shape or the tip thereof is bent inward to form a round shape, and the tip of the ground electrode 7b is inserted into the tip of the high-voltage electrode 6b without contacting the high-voltage electrode 6b. The electric field strength between the high voltage electrode 6b and the ground electrode 7b becomes high. Then, by inserting the tip of the ground electrode 7b into the high voltage electrode 6b, a discharge arc can be generated between the high voltage electrode 6b and the ground electrode 7b, which are closer to each other during discharge. As a result, the voltage dividing unit 8 can be kept away from the discharge arc, and the voltage dividing unit 8 can be prevented from becoming a high voltage.

Further, by using a magnetic material for a part or the whole component of the high voltage portion 6 and the grounding portion 7, stronger electromagnetic countermeasures can be taken. For example, a sufficient magnetic shielding effect can be obtained by forming a part or the whole part of the high-voltage portion 6 and the grounding portion 7 with a known soft magnetic material such as iron, stainless steel, and nickel alloy. Further, by forming a part or the whole component of the high voltage portion 6 and the grounding portion 7 with a soft magnetic material and a material having a 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-voltage portion 6 and the grounding portion 7 by plating or the like.

When the voltage dividing part is not covered with metal with respect to the outer surface like the conventional capacitor type instrument transformer, the electromagnetic wave from the outside affects the voltage dividing part, and it is difficult to measure with high accuracy. In the vacuum capacitor type instrument transformer 1 of the present invention, more accurate measurement can be performed by taking the above-mentioned electromagnetic countermeasures.

In particular, by applying the vacuum capacitor type instrument transformer 1 according to the embodiment of the present invention to a high voltage instrument transformer, high-precision measurement that cuts off electromagnetic force can be performed, and a small size and larger capacitance can be obtained. Capacity is obtained. Further, when a high voltage enters the voltage transformer 1 for a vacuum capacitor type instrument, it can be prevented from entering the voltage dividing unit 8.

Further, since the vacuum capacitor type instrument transformer 1 according to the embodiment of the present invention has a high electromagnetic countermeasure effect, it is particularly used outside the panel where a larger electromagnetic force (particularly magnetic force) acts than inside the panel. It can be suitably used for instrument transformers.

Although the transformer for the vacuum condenser type instrument of the present invention has been described above by showing a specific embodiment, the transformer for the vacuum condenser type instrument of the present invention is not limited to the embodiment, and its features are described. The design can be changed as appropriate within a range that does not impair, and the design change also belongs to the technical scope of the present invention.

1 ... Vacuum capacitor type instrument transformer 2 ... Vacuum capacitor (main capacitor)
3 ... Pressure dividing capacitor 4 ... Housing 5 ... Output terminal 6 ... High voltage part, 6a ... High voltage terminal, 6b ... High voltage electrode, 6c ... Connection part 7 ... Grounding part, 7a ... Grounding terminal, 7b ... Grounding electrode, 7c ... Hole 8 ... Pressure dividing unit, 8a ... Pressure dividing electrode, 8b ... Pressure dividing terminal, 8c ... Electrode shaft 9 ... Insulated cylinder 10 ... Insulated cylinder (internal insulating cylinder)

Claims (4)

A vacuum capacitor type instrument transformer including a main capacitor and a voltage dividing capacitor connected in series with the main capacitor.
Of the main capacitors, the capacitor directly connected to the voltage dividing capacitor is
Insulation tube and
A high-voltage terminal provided at one end of the insulating cylinder and sealing one end of the insulating cylinder,
A tubular high-voltage electrode extending from the high-voltage terminal to the inside of the insulating cylinder,
A grounding terminal provided at the other end of the insulating cylinder and sealing the other end of the insulating cylinder,
A cylindrical ground electrode extending from the ground terminal to the inside of the insulating cylinder,
A voltage dividing electrode provided inside the high-voltage electrode without being in contact with the high-voltage electrode is provided via an internal insulating cylinder provided at the end of the ground electrode.
The end portion of the ground electrode is provided so as to extend inside the high voltage electrode without being in contact with the high voltage electrode.
A vacuum capacitor type instrument transformer characterized in that the electrode shaft of the voltage dividing electrode is provided by inserting the inside of the internal insulating cylinder and the ground electrode. The vacuum capacitor type instrument transformer according to claim 1, wherein the voltage dividing electrode is hemispherical. The vacuum capacitor type instrument transformer according to claim 1 or 2, wherein the tip portion of the high voltage electrode is formed in a ring shape or by bending the tip portion inward to be round. The vacuum according to any one of claims 1 to 3, wherein the high-voltage terminal, the high-voltage electrode, the ground terminal, and a part or all of the ground electrode are made of a magnetic material. Condenser type instrument transformer.

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