JPH0530617A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To provide a gas insulated switchgear in which an extensional unit can be installed for an existing bus disconnector without interrupting the operation of the gas insulated switchgear. CONSTITUTION:In a gas insulated switchgear comprising a main bus 1 for extension, a disconnector 3 for the main bus l, a gas section 9 for housing them 1, 3 and maintained at a rated gas pressure, an insulating spacer 8 fixed to the joint of the gas section 9, and a cover 11 fixed to the insulating spacer 8, a joint bus section 12 having independent gas section is disposed between the insulating spacer 8 and the cover 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear used in a substation, a switchgear, a private substation, or the like, and more particularly to a gas-insulated switchgear for the convenience of adding a gas-insulated switchgear. ..

[0002]

2. Description of the Related Art As a conventional gas-insulated switchgear of this type, for example, Mitsubishi Electric Technical Report, 63
Vol. 10, No. 10, p. 12, FIG. 6, and FIG. 2 shows this gas insulated switchgear. Therefore, a conventional gas-insulated switchgear will be described with reference to FIG. Figure 2
In the figure, 1 is the main busbar A, 2 is the main busbar B, 3 is a busbar disconnector used for the main busbar A, 4 is a busbar disconnector used for the main busbar B, 5 is a grounding switch, and 6 is a transformer current And 7 are circuit breakers, 8 is an insulating spacer, and 9 and 10 are gas sections whose insides are maintained at a rated gas pressure (for example, 4 Kg / cm ² G). In addition, FIG. 3 is a diagram showing the busbar disconnectors 3, 4 and the like installed in advance in case of installing units such as the current transformer 6 for the instrument and the circuit breaker 7 in the future. A cover 11 is attached to the insulating spacer 8.

When a conventional gas-insulated switchgear is added, the gas pressure in the gas section 9 of the busbar disconnector 3 and the main busbar 1 which has been installed in advance is reduced to near atmospheric pressure. After removing the cover 11 by the
Connect an extension unit such as circuit breaker 7. After the connection of the extension unit is completed, the pressure is increased by filling the gas section 9 of the busbar disconnector 3 and the main busbar A1 with gas to restore the rated gas pressure, and then the operation of the main busbar A1 is restarted. I was trying to do it. Such degassing and gas filling operations are performed by adding the insulating spacer 8 made of a casting insulator to the gas section 9 when the additional work is performed without the cover 11 alone without performing such operations. This is because it is damaged by the gas pressure and the safety of workers cannot be maintained.

[0004]

However, in the conventional gas-insulated switchgear, the busbar disconnectors 3 and 4 previously installed as described above have a structure in which the cover 10 is directly attached to the insulating spacer 8. When connecting the extension unit, the operation of the main bus 1 must be temporarily stopped as described above, during which the operating capacity of the gas insulated switchgear decreases and the power system of the substation, etc. There was a problem of reduced reliability.

The present invention has been made to solve the above problems, and an additional unit can be added to a previously installed busbar disconnector without stopping an operating gas-insulated switchgear. An object is to provide a gas insulated switchgear.

[0006]

DISCLOSURE OF THE INVENTION A gas insulated switchgear according to the present invention is an extension main bus, a bus disconnector used for the extension bus, and a gas in which both are housed and maintained at a rated gas pressure. A gas-insulated switchgear comprising a section, an insulating spacer attached to a connecting portion of the gas section, and a cover attached to the insulating spacer, the connection having an independent gas section between the insulating spacer and the cover. It is configured by interposing a busbar portion.

[0007]

According to the present invention, when the extension unit is connected to the bus bar disconnector, the gas pressure of the gas section of the connecting bus bar is kept at atmospheric pressure while the gas section of the bus bar disconnector is kept at the rated gas pressure. After lowering the cover to the vicinity and removing the cover, connecting the extension unit to the connecting busbar section, simply return the gas pressure of the gas section of the connecting busbar section to the rated gas pressure, without stopping the gas insulated switchgear. Can be added.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiment shown in FIG. 1 is a view showing an embodiment of the gas-insulated switchgear of the present invention and is a sectional view showing a preceding installation portion of the gas-insulated switchgear.

As shown in FIG. 1, the gas-insulated switchgear according to the present embodiment has a main bus bar 1 which is a preceding installation part having a future expansion plan, and a bus bar disconnector 3 used for the extension main bus bar 1
A gas section 9 in which both of these 1 and 3 are housed and held at a rated gas pressure, an insulating spacer 8 attached to the connecting portion of the gas section 9, and a cover 11 attached to the insulating spacer 8. Is configured.

In the gas-insulated switchgear, the connecting busbar portion 12 having an independent gas section is interposed between the insulating spacer 8 and the cover 11. When connecting an additional unit such as a current transformer 6 for a measuring instrument, a circuit breaker 7 (see FIG. 2), which is to be added, the cover 11 is removed and the connecting busbar 12 is connected. Others are configured similarly to the conventional one. In the gas-insulated switchgear of this embodiment, the main busbar is a three-phase batch type and the busbar disconnector and the subsequent ones are of the phase separation type, and the busbar disconnector is a dual gas line for each unit. It is of the bus bar type.

When connecting the extension unit to the gas-insulated switchgear of this embodiment, first, the busbar disconnecting switch 3 and the busbar disconnecting switch 4 which are already installed in advance are opened, and the grounding switch is connected. And close the conductor to ground the extension side conductor. In addition, the main bus A 1 and its bus disconnector 3 gas section 9 and main bus B 2
And the gas section 10 of the busbar disconnector 4 is maintained at the rated gas pressure as it is, and the main busbar A 1 and the main busbar B 2 are not stopped and the operating state is maintained. Next, the gas pressure in the gas section of the connecting bus bar 12 is lowered to near atmospheric pressure, and then the cover 1
The gas between 1 and the insulating spacer 8 is removed, and the cover 11 is removed from the insulating spacer 8. After removing the cover 11,
Extension units such as the current transformer 6 and the circuit breaker 7 are connected to the connecting bus bar 12. For the gas division of each added equipment, vacuum the equipment and fill the gas until the rated gas pressure is reached. Further, by filling the gas section of the connecting bus bar portion 12 with gas, the pressure is raised to return to the rated gas pressure. After that, various tests are performed on the expansion unit, and if it is confirmed that the expected function is exhibited, the test is terminated and the expansion unit starts operating.

As described above, according to the present embodiment, the connecting busbar portion 12 having the gas section through the insulating spacer 8 on the gas section 9 of the main busbar instep 1 previously installed for expansion.
Since the installation of the main unit allows the extension unit to be connected without stopping the main busbar A1 and the busbar disconnector 3 thereof, the operating capacity of the substation or the like can be reduced even during the extension work. Therefore, the reliability of substations can be improved.

In the above embodiment, the main busbar is a three-phase batch type, the busbar disconnector and the subsequent ones are the phase separation type, and the busbar disconnector is the same gas section for each unit. Although only the one described above, the present invention may be a single bus system, it can be similarly applied as long as the extension unit can be connected without stopping the only main bus, Not only the main bus, but also the busbar disconnector, current transformer for instrument, circuit breaker, lightning arrester, etc., excluding the drawer bushing, all three-phase all-in-one type gas insulated switchgear with double busbar system The same can be applied to any of the single bus system.

Further, the present invention can be applied to both the double bus system and the single bus system in the gas insulated switchgear in which all the components including the main bus are phase separation type. In addition, even in a busbar system other than the double busbar system and the single busbar system, by adding the connecting busbar part in the present invention to the part connected to the main busbar part that is installed in advance, the same operational effect as the present invention can be expected. it can.

[0015]

As described above, according to the present invention, the main bus for expansion installed in advance for future expansion, the bus disconnector used for the main bus for expansion, and both of them are stored. A gas-insulated switchgear provided with a gas section held at a rated gas pressure, an insulating spacer attached to a connecting portion of the gas section, and a cover attached to the insulating spacer, and between the insulating spacer and the cover. By interposing a connecting busbar section with an independent gas section,
It is possible to provide a gas-insulated switchgear capable of adding an additional unit to a busbar disconnector installed in advance without stopping the gas-insulated switchgear in the operating state.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a gas-insulated switchgear of the present invention, and is a cross-sectional view showing a preceding installation portion of the gas-insulated switchgear.

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

FIG. 3 is a view corresponding to FIG. 1 showing a preceding installation portion of a conventional gas insulated switchgear.

[Explanation of symbols]

 1 Main Busbar A 3 Busbar Disconnector 8 Insulation Spacer 9 Gas Section 11 Cover 12 Connection Busbar

[Procedure amendment]

[Submission date] November 8, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION This invention is, substation, switching station, own house
Gas insulated switchgear used in use receiving substation facilities, and more particularly relates to a gas insulated switchgear which aimed the convenience of the extension of the gas insulated switchgear.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art As a conventional gas-insulated switchgear of this type, for example, Mitsubishi Electric Technical Report, 63
Vol. 10, No. 10, p. 12, FIG. 6, and FIG. 2 shows this gas insulated switchgear. Therefore, a conventional gas-insulated switchgear will be described with reference to FIG. Figure 2
In the figure, 1 is the main busbar A, 2 is the main busbar B, 3 is a busbar disconnector used for the main busbar A, 4 is a busbar disconnector used for the main busbar B, 5 is a grounding switch, and 6 is a transformer current And 7 are circuit breakers, 8 is an insulating spacer, and 9 and 10 are gas sections whose insides are maintained at rated gas pressures (for example, 4 kg / cm ² G). In addition, FIG. 3 is a diagram showing the busbar disconnectors 3, 4 and the like installed in advance in case of installing units such as the current transformer 6 for the instrument and the circuit breaker 7 in the future. A cover 11 is attached to the insulating spacer 8.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

When a conventional gas-insulated switchgear is added, the gas pressure in the gas section 9 of the busbar disconnector 3 and the main busbar 1 which has been installed in advance is reduced to near atmospheric pressure. After removing the cover 11 by the
Connect an extension unit such as circuit breaker 7. After the connection of the extension unit is completed, the pressure is increased by filling the gas section 9 of the busbar disconnector 3 and the main busbar A1 with gas to restore the rated gas pressure, and then the operation of the main busbar A1 is restarted. I was trying to do it. Such degassing and gas filling operations are performed by adding the insulating spacer 8 made of a casting insulator to the gas section 9 when the additional work is performed without the cover 11 alone without performing such operations. damaged by the gas pressure, which is either found may be the case ing not maintain the safety of the workers.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

However, in the conventional gas-insulated switchgear, the busbar disconnectors 3 and 4 previously installed as described above have a structure in which the cover 11 is directly attached to the insulating spacer 8. When connecting the extension unit, the operation of the main bus 1 must be temporarily stopped as described above, during which the operating capacity of the gas insulated switchgear decreases and the power system of the substation, etc. There was a problem of reduced reliability.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

According to the present invention, when the extension unit is connected to the bus bar disconnector, the gas pressure of the gas section of the connecting bus bar is kept at atmospheric pressure while the gas section of the bus bar disconnector is kept at the rated gas pressure. Remove the cover under clogs state to near, after connecting the expansion unit to the connection bus unit, the gas pressure of the gas section of the connection bus unit only returned to the rated gas pressure, it added without stopping the gas insulated switchgear Units can be added.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

When connecting the extension unit to the gas-insulated switchgear of this embodiment, first, the busbar disconnecting switch 3 and the busbar disconnecting switch 4 which are already installed in advance are opened, and the grounding switch is connected. And close the conductor to ground the extension side conductor. In addition, the main bus A 1 and its bus disconnector 3 gas section 9 and main bus B 2
And the gas section 10 of the busbar disconnector 4 is maintained at the rated gas pressure as it is, and the main busbar A 1 and the main busbar B 2 are not stopped and the operating state is maintained. Next, the gas pressure in the gas section of the connecting bus bar 12 is lowered to near atmospheric pressure, and then the cover 1
The gas between 1 and the insulating spacer 8 is removed, and the cover 11 is removed from the insulating spacer 8. After removing the cover 11,
Extension units such as the current transformer 6 and the circuit breaker 7 are connected to the connecting bus bar 12. Regarding the gas classification of each added equipment, after vacuuming each, fill the gas until the rated gas pressure is reached. Further, by filling the gas section of the connecting bus bar portion 12 with gas, the pressure is raised to return to the rated gas pressure. After that, various tests are performed on the expansion unit, and if it is confirmed that the expected function is exhibited, the test is terminated and the expansion unit starts operating.

Claims (1)

Claims: 1. A main bus bar for expansion, a bus bar disconnector used for the main bus bar for expansion, a gas section in which both are housed and maintained at a rated gas pressure, and a gas section In a gas-insulated switchgear including an insulating spacer attached to a connecting portion and a cover attached to the insulating spacer, a connecting busbar portion having an independent gas section is interposed between the insulating spacer and the cover. A gas insulated switchgear characterized by the above.