KR830000283Y1 - Voltage detector for gas or liquid insulated high voltage switchgear - Google Patents

Abstract

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Description

Voltage detector for gas or liquid insulated high voltage switchgear

1 is an exemplary embodiment of a voltage detecting device according to the present invention attached to a flat plate as an insulating plate.

2 is another embodiment of the voltage detection device having a funnel-shaped insulating plate.

3 is an enlarged view illustrating main parts of FIG. 1.

The present invention relates to a voltage detection device for a gas or liquid insulated high voltage switchgear having a high voltage conductor disposed in a grounded metal box, and a voltage divider and a voltage drop inside the metal box.

In the voltage detection devices (DE-OS 2125297, 2325448, 2409595) already known in this field, a divider composed of a vertical voltage capacitor serves as a capacity divider. The upper voltage capacitor sometimes has a high voltage conductor as the high voltage electrode, and the low voltage electrode has a conductor attached to the insulator. The lower voltage capacitor, together with the first coating, is made of a wider coating on an insulator or metal box, or sometimes a hoisting capacitor in an insulator. The voltage drop caused by the current connection of the high and low voltage capacitors is provided with an amplifier placed outside the grounded metal box.

Conventional voltage detectors with capacity dividers function well in terms of weighing technology, but the required capacity must be relatively large, so the internal volume must be relatively large.

Therefore, the present invention is based on the problem of suggesting a voltage detection device for gas or liquid insulated high voltage switchgear in which a voltage divider is put in a metal box, which can be manufactured with a relatively low volume and can be manufactured at low cost.

In order to solve this problem, in the above-described voltage detection device, a voltage divider is used as a resistance voltage divider according to the present invention, and is made of a film made of a resistance material attached on one side of an insulator placed between a high voltage conductor and a grounded metal box. The film extends from the high-voltage conductor to the metal box and is blocked near the metal box of the mill where the voltage drop is formed.

The essential advantage of the voltage detection device according to the present invention is that only a film made of a resist material is inserted to assemble the resistor voltage divider on a very thin insulator, so that space requirements in the front and rear axes of the switchgear are very small.

Therefore, it is no longer necessary to use a cylinder body extending not only to the upper voltage capacitor in the longitudinal direction of the switchgear but also to the lower voltage capacitor in some cases. do. In addition, the fabrication of the resistive voltage divider is relatively simple because only one side of the insulator inserts a film made of a resistive material, and the fallout needs to be insulated only once to form a voltage drop. On the other hand, in the known voltage divider of a voltage detecting device, a conductive film is attached to the inner and outer surfaces of the insulator, a conductive film is attached to the inner surface, and a hoisting capacitor is attached to the inner surface, for example.

Another advantage of the voltage detection device according to the present invention is that the dielectric constant of the resistance voltage divider is very small, which has a favorable influence on the precision measurement as well as the pressure distribution during the stroke.

The voltage detection device according to the present invention is particularly advantageous in that the insulator is made of an insulating plate, so that the space requirement is small. This formation itself has a particular advantage, because the high voltage conductor pin insulators commonly used in the high-voltage switchgear in the metal box can be used as the insulating plate. In addition, since only a pin insulator with a resistive film is attached to one side of the voltage divider, there is no need to insert an auxiliary insulator into a grounded metal box when making a voltage divider.

In the voltage detection device according to the present invention, it is particularly advantageous to use a high voltage conductor pin insulator made of a funnel as an insulating plate in order to extend the film of the resistance material.

In the voltage detecting device according to the present invention in which an insulating plate is attached as an insulator, a film made of a resistor is not attached to one side. However, this is advantageous because an advantageous structure can be achieved according to this method in that it avoids non-linear voltage distribution during stroke with respect to dielectric constant formation rather than inconsistency.

The voltage drop next to the resistor divider can be made in various ways, for example, it can be put as a kind of wire strategy between the two areas of the film. However, it is made of a ring made of a material with good electrical conductivity existing on the side of the insulating plate of the voltage drop in that the field distribution is as uniform as possible within the metal box in the region of the resistance voltage divider. It is defective and advantageously with the coating.

The ground end of the potentiometer, ie the end of the coating of the resistive material away from the high-conductor conductor to the grounded metal box, for example, can be connected by means of an electric wire. However, as a more advantageous method here, there may be another ring made of electrically conductive material and electrically connected to the grounded metal box.

In order to achieve a complete improved technical relationship, it would be advantageous to not connect the ground end of the potentiometer to a grounded metal box, but to pull it out to insulate it from the metal box and to connect it to a clearly defined earth potential. As a result, when performing the high pressure test that can be performed as the voltage detection device according to the present invention, the accuracy thereof can be improved.

Next, the contents of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a voltage detecting device according to the present invention with a flat plate as an insulator, while FIG. 2 shows another embodiment of a voltage detecting device with a funnel-shaped insulating plate, while FIG. The main part of the figure is enlarged.

In the embodiment according to FIG. 1, the high-voltage conductor 3 is arranged inside the metal box 1 of the high-pressure switching device 2.

The high voltage conductor 3 is surrounded by a flat insulating plate 4, the outer side of which is adjacent to the metal box 1.

The insulating plate 4 has a coating 6 made of a resistance material on one side 5 thereof, which is cut off for the formation of the voltage drop 7 near the metal box 1. Accordingly, there is a voltage in the voltage drop unit 7, and this voltage causes a small amount of voltage to the high voltage conductor 3 due to the resistance relationship of the coating 6 region on both sides of the break point.

One input 10 of the amplifier 11 is connected with the voltage drop 7 on the lead 8 penetrated out by the communication hole 9 in the metal box 1, and the other input of the amplifier is connected. 12 is grounded. The voltage dropping in the voltage drop section 7 is amplified in the amplifier 11, and the differential resistor 13 dependent thereon generates a voltage, which represents the amount of high voltage in the high voltage conductor 3.

The embodiment according to FIG. 2 is surrounded by an insulating plate 20 made of a funnel shape, which is supported by the metal box 1 of the high-voltage switchgear from the outside again. It differs from an Example in figure.

The funnel-shaped insulating plate 20 has a coating 6 of resistance material on its side 21 on the side of the high-voltage conductor 3, which is located near the metal box 1. Blocked in circles In the blocking region, both regions of the coating 6 are electrically connected to each other under the formation point of the voltage drop portion 7, and the amplifier 11 is connected thereto in the same manner as described with reference to FIG. It is. At this time, a voltage is generated in the resistor 13, which is proportional to the high voltage present in the high voltage conductor 3.

The detail A according to FIG. 1 described in FIG. 3 shows a ring 30 made of a conductive material on one side surface 5 of the insulating plate 4 on the outer side of the film 6 made of a resist material. This ring is adjacent to both regions of the film 6 made of a resist material and is thereby connected to both regions in a current manner. A lead 8 is connected to a ring 30 of a material with good conductivity, which extends by means of a communication hole 9 to an amplifier, not shown here, in the manner described in connection with FIG.

The insulating plate 4 is attached to another ring 31 of conductive material near its metal box 1, which is in contact with the outer region of the coating 6. The current is connected to the area. The second ring 31 is connected to the metal box 1 which is grounded on the conductive wire 32, so that the second ring 31 is finally grounded.

A ring made of a conductive material can be attached to the insulating plate 20 made in the shape of a funnel according to FIG. 2 or to the coating 6 attached to the insulating plate in the same manner as described with reference to FIG.

The present invention is to obtain a voltage detection device for gas or liquid insulated high pressure switch with good metering technical characteristics because of low space consumption, easy manufacturing, and low dielectric constant.

Claims (1)

A voltage detecting device for gas or liquid insulated high voltage switchgear having a high voltage conductor including a voltage divider and a voltage divider disposed in a grounded metal enclosure, the voltage divider being a resistive voltage divider. 3) and a film 6 made of a resistance material attached on one side 5 of the insulating plate 4 lying between the grounded metal box 1, which is formed from the high-voltage conductor 3; A voltage detection device for a gas or liquid insulated high voltage switchgear, which extends to the metal box (1) and is cut off under the point of formation of the voltage drop (7) near the metal box (1).