JPH0530628A - High voltage electric machinery - Google Patents

Abstract

PURPOSE:To prevent charging of insulators employed in high voltage electric machinery. CONSTITUTION:A high voltage conductor 2 is arranged in the axial direction in an enclosed container 1 at the central part thereof. The high voltage conductor 2 is supported in the enclosed container 1 by means of an insulating cone spacer 3 and an insulating post spacer 4. Insulating gas 5 added with alcohol is also encapsulated in the enclosed container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage electric device used in a substation or a switching station, and more particularly, to a high-voltage electric device having an improved insulating gas structure in order to prevent electrification of an insulator. It is about.

[0002]

2. Description of the Related Art Various high-voltage electric devices are used in substations, switchyards, etc. Among them, a gas-insulated switchgear or a gas-insulated transformer adopting a gas insulation system is used as a central device in the substation. Widely used. Hereinafter, a gas-insulated switchgear will be described as an example of the high-voltage electrical equipment.

The gas-insulated switchgear accommodates a disconnector, a circuit breaker, a grounding device, an instrument transformer, a lightning arrester, etc., which are necessary for opening and closing operations in a substation, etc., in a sealed container and also in a surrounding gas space. SF ₆ gas is charged under pressure and has excellent electrical properties such as insulation and arc extinguishing ability. These devices are connected to each other by high voltage conductors,
The high voltage part is supported and fixed by an insulating support called a spacer.

Such a gas-insulated switchgear has a number of excellent features such as easy switching operation with high voltage and high power, high reliability, high safety, compact size and excellent harmony with the environment. It has features and is widely used.

[0005]

By the way, in recent years, high-voltage electric equipment such as a gas-insulated switchgear and a gas-insulated transformer is required to have high reliability as the quality of electric power is improved. In addition, since it is particularly difficult to acquire a land in the center of the city, there is an increasing demand for compact equipment. As described above, in order to further improve reliability or achieve compactness of equipment, insulating spacers supporting high-voltage conductors are required to have further excellent insulating characteristics.

However, when the disconnecting switch or the circuit breaker is opened, a DC voltage remains on the load side busbar connected to them. In such a case, the insulating spacer may be charged, and in some cases, the insulating performance may be deteriorated.

Further, when the insulating spacer is charged, metal foreign matters and the like, which are harmful to insulation, easily adhere to the surface of the insulating spacer. In such a case, there is a problem that the flashover voltage of the insulating spacer is significantly reduced.

[0008] Since such a phenomenon becomes a great hindrance in achieving further improvement in reliability and compactness of the high-voltage electric equipment, a solution thereof has been earnestly desired.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to prevent charging of an insulator used in a high-voltage electric device and to improve reliability. It is to provide a high-voltage electric device with improved performance.

[0010]

According to the present invention, in a high-voltage electric device in which a high-voltage device is placed in a hermetically sealed container and an insulating gas is enclosed in a surrounding space, alcohol is added to the insulating gas. It is characterized by that.

[0011]

According to the high-voltage electric equipment of the present invention, the charging of the insulator can be prevented even if the DC voltage remains on the high-voltage conductor by the charge removing action of the alcohol added to the insulating gas. It is possible to prevent deterioration of the insulating property of the insulating material.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the present invention is applied to a gas-insulated bus bar. That is, in the closed container 1 for accommodating the high-voltage conductor, the high-voltage conductor 2 is arranged in the axial direction of the central portion thereof.
Are arranged. The high voltage conductor 2 is supported in the closed container by a cone type insulating spacer 3 and a post type insulating spacer 4. In addition, an insulating gas 5 to which alcohol is added is enclosed in the closed container 1.

As described below, in the high-voltage equipment in which the insulating gas to which alcohol is added is sealed, as described below,
It is possible to prevent the insulator from being charged.

Generally, a DC voltage is generated on the load side bus bar with the opening operation of a disconnector or a circuit breaker. It is known that this DC voltage causes charging of the insulator used. There is. On the other hand, alcohol is known to have a function of removing the charge of the insulator.

The present inventors have paid attention to the above-mentioned action of removing the charge of alcohol, and have found that the addition of alcohol to the insulating gas has the effect of preventing the charge of the insulator. Moreover, since the insulator can be prevented from being charged in advance, it is possible to avoid deterioration of the insulation performance of the insulator and improve the reliability of the high-voltage device. Furthermore, even if a metal foreign substance that deteriorates the insulation performance is mixed in the high-voltage electric device, it is possible to prevent the metal foreign substance from adhering to an insulating material such as an insulating spacer.

As described above, according to this embodiment, since the insulator can be prevented from being charged in advance, deterioration of the insulating performance of the insulator can be avoided and the reliability of the high-voltage equipment can be improved.
Moreover, since it becomes possible to improve the insulation performance of the insulator, it becomes possible to provide a more compact high-voltage electric device.

The present invention is not limited to the above-described embodiments, and is not limited to gas-insulated busbars, but other high-voltage electrical equipment, such as insulating rods used in gas-insulated switchgear. Needless to say, the same effect can be obtained by applying it to a transformer, a lightning arrester or the like using a gas insulation method.

[0019]

As described above, according to the present invention, by adding alcohol to the insulating gas, it is possible to prevent the insulator used in the high-voltage electric equipment from being charged, and to improve the reliability. It is possible to provide an improved high-voltage electric device.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a gas insulated busbar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... High voltage conductor 3 ... Cone type insulating spacer 4 ... Post type insulating spacer 5 ... Insulating gas to which alcohol is added

Claims (1)

Claim: What is claimed is: 1. A high-voltage electric device in which a high-voltage device is placed in a hermetically sealed container, and an insulating gas is enclosed in a surrounding space, wherein alcohol is added to the insulating gas. Characteristic high voltage electrical equipment.