JPH0599954A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To enable common constitution of sealed vessels regardless of attaching a voltage divider by providing a cover which is placed in a flange of the sealed vessel and is covering the flange part for sealing. CONSTITUTION:The voltage in a high voltage conductor 2 contained in a sealed vessel 10 for sealing insulation gas is divided with a capacitor in a voltage divider 5. The device 5 is fixed on a cover 30 covering a flange part at the front of the cylindrical vessel 10 for sealing. By this, the vessel 10 itself is to have a common constitution regardless of placing the device 5 and thus, standardization of the vessel 10 becomes possible. If the device 5 is to be placed in an existing gas insulation gate device having no device 5, only the cover 30 needs to be changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to measure the voltage of a high-voltage conductor contained in a hermetically sealed container. The present invention relates to a gas-insulated switchgear provided with a pressure device.

[0002]

2. Description of the Related Art A gas-insulated switchgear generally called GIS is composed of a hermetically sealed container having a circuit breaker, a disconnector, etc. housed therein, and a high-pressure insulating gas is enclosed in the hermetically sealed container. It is a thing. Sulfur hexafluoride, SF for short
_The insulating gas consisting of ₆ has a higher dielectric strength as the pressure becomes higher. Therefore, especially in the GIS for ultrahigh pressure, SF ₆ is filled with a high pressure of several atmospheres. Since the sealed container needs to be a high-pressure container that can withstand such a high pressure, it is manufactured in a combined shape of cylindrical steel plates.

A current transformer for a meter is housed for measuring the current of a high voltage lead housed in a hermetically sealed container, and a voltage dividing device for obtaining a low measured voltage by a capacitor partial pressure is provided for measuring a voltage. .. FIG. 2 is a partial cross-sectional view showing a portion provided with a conventional GIS voltage dividing device 4, which is provided at an end portion of a cylindrical hermetically sealed container 1 as shown so as not to interfere with other storage equipment. ing. In this figure,
An end portion on the left side of the figure of the cylindrical sealed container 1 has a flange structure, and a cover 3 is provided on the flange portion to cover the end portion and maintain airtightness. Illustration of packings and tightening bolts of the flange portion is omitted.

The voltage dividing device 4 includes a branch pipe 40, a condenser housing box 41, a voltage dividing condenser 42, a cover 43, and an airtight terminal 4.
4, a voltage dividing electrode 45, a voltage dividing electrode supporting insulator 46, and a connection lead without reference numeral. The tip of the high-voltage conductor 2 is rounded and protrudes from the cover 3 to a position separated by a predetermined insulation distance, and a cylindrical voltage dividing electrode 45 arranged coaxially with the high-voltage conductor 2 is provided near this tip. The voltage dividing electrode 45 is connected to the voltage dividing capacitor 42 via an airtight terminal 44 that penetrates a cover 43 attached to a flange portion at the tip of a branch pipe 40 provided in the sealed container 1, and this connection is made. The measurement voltage is taken out from the part by a lead (not shown), and the other end of the voltage dividing capacitor 42 is grounded. The voltage dividing capacitor 42 is a cover 4 as shown.
It is provided outside of 3, and this part is in the atmosphere,
The capacitor storage box 41 is for protecting the voltage dividing capacitor 42 and leads connected to these from moisture and rain.

FIG. 3 is a partial sectional view of the GIS at the same position as in FIG. 2 when the voltage dividing device is not provided in the same portion as FIG.
Since the branch pipe 40 of FIG. 2 is provided with the voltage dividing condenser 42, the sealed container 10 without the branch pipe 40 is used in FIG. 3 which does not require the voltage dividing device 40.

[0006]

As described above, there is a difference in the presence or absence of the branch pipe 40 between the sealed container 1 when the voltage dividing device 4 is provided and the sealed container 10 when not provided. There is a problem that there is a problem. Even if the voltage dividing device 4 is not provided, however, providing the branch pipe 40 not only raises the cost, but also causes a factor of gas leakage and lowers the reliability of the GIS. Further, if the voltage dividing device is to be attached to an existing GIS which is not provided with the voltage dividing device, there is a problem that the sealed container must be replaced and the cost required for adding the voltage dividing device is increased.

An object of the present invention is to solve such a problem and to provide a GIS in which a hermetically sealed container can be used in common regardless of whether or not a voltage dividing device is attached.

[0008]

In order to solve the above-mentioned problems, according to the present invention, there is provided a voltage dividing device for dividing the voltage of a high-voltage conductor, which is stored in a hermetically sealed container in which an insulating gas is hermetically sealed, into a capacitor. In this GIS, the voltage dividing device is attached to a flange provided on the sealed container and is provided on a cover that hermetically covers the flange portion, and the sealed container has a cylindrical shape. It is assumed that the voltage dividing device is attached to the cover attached to the flange portion provided on the cylindrical end portion.

[0009]

In the structure of the present invention, the pressure dividing device is attached to the flange provided on the sealed container and is provided on the cover that hermetically covers the flange portion, so that whether the sealed container itself is provided with the voltage dividing device or not. It has a common structure that does not matter. Further, when the voltage dividing device is provided by attaching the voltage dividing device to the cover attached to the flange portion provided at the end of the cylindrical hermetic container, only the cover needs to be changed. The same sealed container may be common.

[0010]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a partial sectional view of a GIS showing an embodiment of the present invention. The same members as those in FIGS. In this figure, the voltage dividing device 5 includes a voltage dividing device attached to the cover 30 via an insulating plate 53, an airtight terminal 54 penetrating the cover 0A, a voltage dividing capacitor 52 attached to the atmosphere side of the cover 30, and It comprises a capacitor housing box 51 for accommodating the voltage condenser 52, a connection lead for not electrically connecting the voltage dividing electrode 55 and the voltage dividing capacitor 52, and a ground lead for grounding one end of the voltage dividing capacitor 52.

The cover 30 is a modification of the cover 3 shown in FIGS. 2 and 3, and the structure for attaching it to the sealed container 10 is the same as that of the cover 3 shown in FIGS. Therefore, the sealed container 1
0 is the same as that of FIG. The voltage dividing electrode 55 has a cylindrical shape coaxial with the high voltage conductor 2 like the voltage dividing device 45 of FIG. 2, and the capacitance between the voltage dividing electrode 55 and the high voltage conductor 2 forms the capacitance on the high voltage side of the capacitor voltage division. The capacitance of the voltage dividing capacitor 52 serves as a low-voltage side capacitance, and the voltage of the voltage dividing electrode 55 taken out through the airtight terminal 54 is the measured voltage. Predetermined electrical processing such as amplification is performed and displayed on the display, or input to the protective relay. These points are the same as those of the conventional voltage dividing device 4 shown in FIG.

Since all the voltage dividers 5 are attached to the cover 30, the replacement of the cover 30 with the detachable cover 3 results in the same operation as in FIG. 3, and it is not necessary to change the sealed container 10 at all. Therefore, regardless of the presence or absence of the voltage dividing device 5, the structure of the hermetically sealed container 10 is common and can be standardized. In addition, as shown in FIG. 3, when modifying the existing GIS without the voltage dividing device, the cover 3 is removed and each component of the voltage dividing device 5 is modified so that the hermetically sealed container 10 is replaced. Modification is easily completed by installing. In this case, the cover 3 to which the voltage dividing device 5 is attached may be prepared in advance and replaced with the cover 3 instead of removing and modifying the cover 3.

In FIGS. 2 and 3 which are conventional examples and FIG. 1 which is an example, the sealed container 1 or 10 has a cylindrical shape. Such a cylindrical sealed container is filled with high pressure SF _6. It is applied to a gas insulated switchgear for ultra high voltage. On the other hand, the GIS of relatively low voltage is also a cubicle type (abbreviated as CGIS). In such a case, it is necessary to use a work handhole or manhole to divide the voltage into one of these covers. By mounting the device, it is possible to obtain the same effect as the above-described embodiment.

[0014]

As described above, the present invention includes the voltage dividing device,
By providing the cover that covers the flange provided on the hermetically sealed container in an airtight manner, the hermetically sealed container itself has a common structure regardless of whether or not a voltage dividing device is provided, and the effect that standardization of the hermetically sealed container can be achieved can be obtained. .. Furthermore, when modifying the existing gas-insulated switchgear without a voltage divider to install the voltage divider, it is only necessary to modify the cover and attach the voltage divider, and no need to modify or replace the sealed container. There is also an effect that the remodeling can be performed at low cost. Further, when the voltage dividing device is provided by attaching the voltage dividing device to the cover attached to the flange portion provided at the end of the cylindrical hermetic container, only the cover needs to be changed. The same sealed container may be common.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a gas insulated switchgear showing an embodiment of the present invention.

FIG. 2 is a partial sectional view of a conventional gas-insulated switchgear.

FIG. 3 is a partial cross-sectional view of the gas-insulated switchgear at the same position as in FIG. 2 when the voltage dividing device is not provided.

[Explanation of symbols]

 1 Sealed Container 10 Sealed Container 2 High Voltage Conductor 3 Cover 30 Cover 4 Voltage Divider 40 Branch Pipe 41 Capacitor Storage Box 42 Voltage Dividing Capacitor 43 Cover 44 Airtight Terminal 45 Voltage Dividing Electrode 46 Insulating Support 5 Voltage Divider 51 Capacitor Storage Box 52 Voltage dividing capacitor 53 Insulating plate 54 Airtight terminal 55 Voltage dividing electrode 56 Insulating support

Claims (2)

[Claims] 1. A gas-insulated switchgear comprising a voltage divider for dividing the voltage of a high-voltage conductor, which is housed in a hermetically sealed container in which an insulating gas is hermetically sealed, into the hermetically sealed container. A gas-insulated switchgear provided on a cover that hermetically covers the formed flange. 2. A gas-insulated switchgear according to claim 1, wherein the hermetically sealed container has a cylindrical shape, and the cover attached to the flange portion of the cylindrical end portion is provided with a voltage dividing device. apparatus.