GIS structure and method for assembling double buses without power failure and reserving maintenance operation interval

Abstract

The invention provides a GIS structure and method for reserving a maintenance operation interval through double-bus non-power-cut assembly. The GIS structure with the reserved interval assembled by the double buses without power failure comprises a first main bus isolating switch air chamber, a second main bus isolating switch air chamber, a transition air chamber and a port air chamber, the transition air chamber is arranged among the first main bus isolation switch air chamber, the second main bus isolation switch air chamber and the interface air chamber and is isolated from the air chambers through air isolation basin-type insulators, and the three air chambers except the transition air chamber are not connected with each other; the connecting conductors in the transition air chamber are respectively connected to the connecting conductors of the first main bus isolating switch air chamber, the second main bus isolating switch air chamber and the interface air chamber; the transition air chamber is of a three-way structure, and the connecting conductor in the transition air chamber is also of a three-way structure. And the GIS extension assembly is assembled at the interface air chamber at the double-bus uninterruptible maintenance operation interval. According to the invention, double-bus non-power-cut assembly and maintenance can be realized.

Description

Technical Field

[0001] The present invention relates to the field of GIS structures, and particularly to a GIS structure and method for assembling a reserved maintenance operation interval without power outage for a double busbar. Background Art

[0002] Currently, when assembling the reserved outgoing line interval of a double busbar GIS and opening the end cover of the interface gas chamber, it will cause at least one busbar disconnector gas chamber connected to the expansion interface to drop by about 1 / 2 of the rated pressure, or a group of busbar disconnectors to be in direct contact with the atmosphere; when the busbar disconnector gas chamber drops by about 1 / 2 of the rated pressure, it will cause the insulation margin of the disconnector contact to be insufficient, and the busbar needs to be powered off, so that only single busbar operation or double busbar shutdown for assembling the reserved interval can be carried out.

[0003] If the gas isolating pot-type insulator arrangement of the operation interval of the double busbar GIS is the same as that of the reserved outgoing line interval of the double busbar GIS mentioned above, the single busbar operation or double busbar shutdown can also be carried out only when overhauling the circuit breaker. In reality, the operation interval of the double busbar GIS usually has one less gas isolating pot-type insulator than the reserved outgoing line interval of the double busbar GIS in the same equipment area, so the single busbar operation or double busbar shutdown can also be carried out only when overhauling the circuit breaker, etc.

[0004] In order to meet the requirements of the double busbar GIS operation interval expansion assembly and the operation interval for overhauling the circuit breaker to maintain double busbar operation, and to reduce the impact on the power grid operation, it is urgent to design a GIS structure and method for assembling and overhauling a double busbar without power outage. Summary of the Invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present invention provides a GIS structure and method for assembling a reserved maintenance operation interval without power outage for a double busbar.

[0006] In a first aspect, the present invention provides a GIS structure for assembling a reserved interval without power outage for a double busbar, which is arranged between a first main busbar, a second main busbar and a GIS expansion component, and includes: a first main busbar disconnector gas chamber, a second main busbar disconnector gas chamber, a transition gas chamber, and an interface gas chamber; a first disconnector DS10 is arranged in the first main busbar disconnector gas chamber, and a second disconnector DS20 is arranged in the second main busbar disconnector gas chamber; The transition gas chamber is arranged between the first main busbar disconnector gas chamber, the second main busbar disconnector gas chamber and the interface gas chamber, and the connecting conductor in the transition gas chamber is connected to the connecting conductors of the first main busbar disconnector gas chamber, the second main busbar disconnector gas chamber and the interface gas chamber respectively through gas isolating pot-type insulators; the transition gas chamber has a tee structure, and the connecting conductor inside the transition gas chamber also has a tee structure; The interface gas chamber is provided with an expansion interface for assembling the GIS expansion component.

[0007] Furthermore, one end of the first main busbar isolating switch gas chamber is connected to the independent gas chamber where the first main busbar is located, and the connecting conductor in the first main busbar isolating switch gas chamber is connected to the first main busbar via an air-spaced basin-type insulator; the other end of the first main busbar isolating switch gas chamber is connected to one end of the transition gas chamber, and a branch of the connecting conductor in the transition gas chamber is connected to the connecting conductor in the first main busbar isolating switch gas chamber via an air-spaced basin-type insulator.

[0008] Furthermore, one end of the second main busbar isolating switch gas chamber is connected to the independent gas chamber where the second main bus is located, and the connecting conductor in the second main busbar isolating switch gas chamber is connected to the second main bus via an air-spaced basin-type insulator; one end of the second main busbar isolating switch gas chamber is connected to one end of the transition gas chamber, and a branch of the connecting conductor in the transition gas chamber is connected to the connecting conductor in the second main busbar isolating switch gas chamber via an air-spaced basin-type insulator.

[0009] Furthermore, any one of the connecting conductor of the first main busbar disconnector gas chamber, the connecting conductor of the transition gas chamber, or the connecting conductor of the second main busbar disconnector gas chamber is connected to the grounding switch ES10.

[0010] In a second aspect, the present invention provides a GIS structure with a double-busbar non-stop maintenance interval. Based on the double-busbar non-stop assembly reserved interval GIS structure, a GIS expansion assembly is assembled at the interface air chamber. The GIS expansion assembly includes: a connecting conductor and contact seat for replacing the pressure-resistant shield cover in the interface air chamber, a number of current transformers, a cylinder, a circuit breaker, an outgoing line disconnector and grounding switch, a GIS overhead line outgoing bushing, and a power cable interface. The operating interval built in the first phase of the project is consistent with the GIS structure of the double-busbar non-stop maintenance operating interval.

[0011] In a third aspect, the present invention provides a method for assembling a double busbar without power outage, which is applied to the GIS structure with reserved spacing for assembling a double busbar without power outage, comprising: When expanding the GIS structure with reserved intervals for double-busbar non-stop power assembly, the first isolating switch DS10 and the second isolating switch DS20 of the GIS structure with reserved intervals for double-busbar non-stop power assembly are opened, and the grounding switch ES10 of the GIS structure with reserved intervals for double-busbar non-stop power assembly is closed and grounded, and part of the insulating gas in the transition gas chamber is recovered to reduce the insulating gas pressure of the transition gas chamber to about 1 / 2 of the rated pressure; the insulating gas in the interface gas chamber is recovered, the end cover of the interface gas chamber is opened, the interface gas chamber is exposed to the air, and the assembly work of the GIS expansion components is carried out.

[0012] Fourthly, the present invention provides a method for overhauling a double busbar without power interruption, which is applied to the GIS structure of the double busbar without power interruption overhaul operation interval, and includes: When overhauling the circuit breaker and current transformer in the GIS structure of the double busbar without power interruption overhaul operation interval, open the first disconnecting switch DS10 and the second disconnecting switch DS20 of the GIS structure of the double busbar without power interruption overhaul operation interval, close the grounding switch ES10 of the GIS structure of the double busbar without power interruption overhaul operation interval for grounding, recover part of the insulating gas in the transition gas chamber, and reduce the insulating gas pressure in the transition gas chamber to about 1 / 2 of the rated pressure; recover the insulating gas in each gas chamber between the transition gas chamber and the GIS overhead line bushing or the power cable joint according to the needs of the overhaul part, and carry out the overhaul work on the circuit breaker, current transformer, disconnecting switch and grounding switch on the outgoing line side, GIS overhead line bushing and power cable interface.

[0013] The above technical solutions provided by the embodiments of the present invention have the following advantages compared with the prior art: When the present invention expands the reserved interval of the GIS, the first disconnecting switch DS10 and the second disconnecting switch DS20 are all opened, the grounding switch ES10 is closed for grounding, part of the insulating gas in the transition gas chamber is recovered, and the insulating gas pressure in the transition gas chamber is reduced to about 1 / 2 of the rated pressure; the insulating gas in the interface gas chamber is recovered, and the end cover of the interface gas chamber is opened for assembly work. Through the above process, the pressure difference on both sides of the gas separation pot insulator between the transition gas chamber and the interface gas chamber will not be too large, thereby reducing the possibility of damage to the gas separation pot insulator during the expansion process and the harm to the operators. At the same time, the insulating gas pressure in the first main busbar disconnecting switch gas chamber and the second main busbar disconnecting switch gas chamber can remain unchanged, and the insulation margin of the first disconnecting switch DS10 and the second disconnecting switch DS20 remains unchanged, which can effectively ensure the insulation effect, so that the first main busbar and the second main busbar can be energized during the expansion construction.

[0014] When overhauling the GIS structure of the operating interval of the double busbar without power outage, the first disconnecting switch DS10 and the second disconnecting switch DS20 are fully opened, the grounding switch ES10 of this interval is closed for grounding, and part of the insulating gas in the transition gas chamber is recovered, so that the insulating gas pressure in the transition gas chamber is reduced to about 1 / 2 of the rated pressure; the insulating gas in each gas chamber between the transition gas chamber and the GIS outgoing line bushing or the power cable joint is recovered as needed according to the overhaul position, and the overhaul work of the circuit breaker, current transformer, outgoing side disconnecting switch and grounding switch, GIS overhead line outgoing line bushing and power cable interface is carried out. Through the above process, the pressure difference on both sides of the gas separation pot insulator between the transition gas chamber and the interface gas chamber will not be too large, thereby reducing the possibility of damage to the gas separation pot insulator during the overhaul process and the harm to the operators. At the same time, the insulating gas pressure in the first main busbar disconnecting switch gas chamber and the second main busbar disconnecting switch gas chamber can remain unchanged, and the insulation margin of the first disconnecting switch DS10 and the second disconnecting switch DS20 remains unchanged, which can effectively ensure the insulation effect, so that when the circuit breaker and current transformer are overhauled, the first main busbar and the second main busbar can be energized and operated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of a GIS structure with a double busbar without power outage for assembling a reserved interval provided by an embodiment of the present invention; Figure 2 is a schematic diagram of another GIS structure with a double busbar without power outage for assembling a reserved interval provided by an embodiment of the present invention; Figure 3 is based on an example provided by an embodiment of the present invention Figure 1 a schematic diagram of a GIS structure for overhauling the operating interval of a double busbar without power outage; Figure 4 is based on an example provided by an embodiment of the present invention Figure 1 a schematic diagram of another GIS structure for overhauling the operating interval of a double busbar without power outage; Figure 5 is based on an example provided by an embodiment of the present invention Figure 2 a schematic diagram of a GIS structure for overhauling the operating interval of a double busbar without power outage; Figure 6 is another schematic diagram of the GIS structure of the double-busbar non-stop maintenance operation interval provided by the embodiments of the present invention based on Figure 2 the example; Figure 7 is the flowchart of the double-busbar non-stop assembly provided by the embodiments of the present invention; Figure 8 is the flowchart of the double-busbar non-stop maintenance provided by the embodiments of the present invention.

[0018] The reference numerals and their meanings in the figure are as follows: 10. The first main busbar; 20. The second main busbar; 30. The first busbar disconnector chamber; 40. The second busbar disconnector chamber; 50. The transition chamber; 60. The interface chamber. Specific embodiments

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that in this document, the terms "include", "comprise" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0021] Embodiment 1 Referring to the attached Figure 1 As shown, the technical solution of the present invention realizes a GIS structure with a reserved interval for double-busbar non-stop assembly, which is arranged between the first main busbar 10, the second main busbar 20 and the GIS expansion component. Among them, the first main busbar 10 and the second main busbar 20 are in independent gas chambers. It includes: the first busbar disconnector chamber 30 and the second busbar disconnector chamber 40; a transition chamber 50 with a tee structure is arranged between the first busbar disconnector chamber 30 and the second busbar disconnector chamber 40.

[0022] One end of the first main busbar isolating switch gas chamber 30 is connected to the independent gas chamber where the first main busbar 10 is located, and the connecting conductor in the first main busbar isolating switch gas chamber 30 is connected to the first main busbar 10 via an air-spaced basin insulator; one end of the first main busbar isolating switch gas chamber 30 is connected to one end of the transition gas chamber 50, and a branch of the connecting conductor in the transition gas chamber 50 is connected to the connecting conductor in the first main busbar isolating switch gas chamber 30 via an air-spaced basin insulator; a first isolating switch DS10 is arranged on the connecting conductor in the first main busbar isolating switch gas chamber 30.

[0023] One end of the second main busbar isolating switch gas chamber 40 is connected to the independent gas chamber where the second main busbar 20 is located, and the connecting conductor in the second main busbar isolating switch gas chamber 40 is connected to the second main busbar 20 via an air-spaced basin insulator; one end of the second main busbar isolating switch gas chamber 40 is connected to one end of the transition gas chamber 50, and a branch of the connecting conductor in the transition gas chamber 50 is connected to the connecting conductor in the second main busbar isolating switch gas chamber 40 via an air-spaced basin insulator; a second isolating switch DS20 is arranged on the connecting conductor in the second main busbar isolating switch gas chamber 40.

[0024] Figure 1 In the example, the connecting conductor of the first main busbar disconnector chamber 30 is connected to the grounding switch ES10.

[0025] Assemble the GIS expansion components at the interface air chamber, which include: connecting conductors and contact holders that replace the pressure-resistant shielding cover of the interface air chamber 60 li, several current transformers, cylinders, circuit breakers, outgoing line side disconnectors and earthing switches, GIS overhead line outgoing bushings and power cable interfaces.

[0026] Example 2 exist Figure 2 In the present invention, a double busbar GIS structure with reserved spacing for non-stop assembly is provided, wherein the connecting conductor of the transition chamber 50 is connected to the grounding switch ES10. The rest of the structure is the same as that of the first embodiment.

[0027] Example 3 like Figure 5 As shown, a double busbar non-stop power supply assembly method is applied to assembling GIS expansion components in a GIS structure with reserved intervals for double busbar non-stop power supply assembly, comprising: When expanding the GIS structure with reserved intervals for double-busbar non-stop power assembly, the first disconnector DS10 and the second disconnector DS20 of the GIS structure with reserved intervals for double-busbar non-stop power assembly are opened; the grounding switch ES10 of the GIS structure with reserved intervals for double-busbar non-stop power assembly is closed and grounded; part of the insulating gas in the transition gas chamber is recovered to reduce the insulating gas pressure in the transition gas chamber to about 1 / 2 of the rated pressure; the insulating gas in the interface gas chamber is recovered; the end cover of the interface gas chamber is opened, the interface gas chamber is exposed to the air, and the assembly work of the GIS expansion components is carried out. The GIS expansion components include: replacing the connecting conductors and contact seats of the pressure-resistant shielding cover of the interface gas chamber 60 li, several current transformers, cylinders, circuit breakers, outgoing side disconnectors and grounding switches, GIS overhead line outgoing bushings and power cable interfaces.

[0028] There are two requirements for the assembly of GIS expansion components. First, the interface air chamber 60 needs to be opened, which requires that the air pressure difference between the transition air chamber 50 and the opened interface air chamber 60, between the transition air chamber and the first main busbar disconnector air chamber, and between the transition air chamber and the second main busbar disconnector air chamber is small to ensure safety; second, the insulating gas pressure of the first main busbar disconnector air chamber and the second main busbar disconnector air chamber where the first disconnector DS10 and the second disconnector DS20 are located needs to remain unchanged to ensure that the insulation margin of the first disconnector DS10 and the second disconnector DS20 remains unchanged.

[0029] Through the above process, the pressure difference on both sides of the air-spaced basin insulator between the transition air chamber and the interface air chamber will not be too large, thereby reducing the possibility of damage to the air-spaced basin insulator during the expansion process and harm to workers. At the same time, while the insulating gas pressure in the first main busbar disconnector air chamber and the second main busbar disconnector air chamber remains unchanged, the pressure difference between the transition air chamber and the first main busbar disconnector air chamber, and between the transition air chamber and the second main busbar disconnector air chamber, is small. This ensures that the insulation margin of the first disconnector DS10 and the second disconnector DS20 remains unchanged, effectively guaranteeing the insulation effect, allowing the first and second main busbars to operate under power during expansion construction, and ensuring that the corresponding insulators are not damaged.

[0030] Example 4 like Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, an embodiment of the present invention provides a GIS structure with a double-busbar non-stop maintenance operation interval, which is assembled based on the GIS structure with a reserved interval for double-busbar non-stop assembly. During the specific implementation process, the GIS extension component is assembled at the interface air chamber 60. The GIS extension component includes: connecting conductors and contact seats that replace the pressure-resistant shielding cover in the interface air chamber 60, several current transformers, cylinders, circuit breakers, outgoing line side disconnectors and grounding switches, GIS overhead line outgoing bushings and power cable interfaces. Figure 3 and Figure 5 In the process, the original interface air chamber 60 is further assembled by connecting the conductor and the contact seat, cylinder and circuit breaker to complete the GIS expansion component. Figure 4 and Figure 6 The original interface air chamber 60 is further assembled to complete the GIS expansion component by connecting the conductor and contact base, cylinder, current transformer and circuit breaker.

[0031] The operating interval built in the first phase of the GIS renovation project is consistent with the GIS structure of the double-busbar non-stop maintenance operating interval.

[0032] Example 5 like Figure 6 As shown, the present invention provides a double busbar non-stop maintenance method, which is applied to the GIS structure with double busbar non-stop maintenance operation interval, comprising: When inspecting the circuit breakers and current transformers in the GIS structure of the double-busbar non-stop maintenance operation interval, the first disconnector DS10 and the second disconnector DS20 of the GIS structure of the double-busbar non-stop maintenance operation interval shall be opened, and the grounding switch ES10 of the GIS structure of the double-busbar non-stop maintenance operation interval shall be closed and grounded, and part of the insulating gas in the transition gas chamber shall be recovered to reduce the insulating gas pressure of the transition gas chamber to about 1 / 2 of the rated pressure; the insulating gas of each gas chamber between the transition gas chamber and the overhead outgoing bushing or power cable joint shall be recovered according to the needs of the inspection location, and the circuit breaker, current transformer, outgoing line side disconnector and grounding switch equipment inspection work shall be carried out.

[0033] Through the above process, the pressure difference on both sides of the air-spaced basin insulator between the transition air chamber and the interface air chamber will not be too large, thereby reducing the possibility of damage to the air-spaced basin insulator during the expansion process and harm to workers. At the same time, while the insulating gas pressure in the first main busbar disconnector air chamber and the second main busbar disconnector air chamber remains unchanged, the pressure difference between the transition air chamber and the first main busbar disconnector air chamber, and between the transition air chamber and the second main busbar disconnector air chamber, is small. This ensures that the insulation margin of the first disconnector DS10 and the second disconnector DS20 remains unchanged, effectively guaranteeing the insulation effect, allowing the first and second main busbars to operate under power during expansion construction, and ensuring that the corresponding insulators are not damaged.

[0034] In the embodiments provided by the present invention, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the structures or units can be in electrical, mechanical, or other forms.

[0035] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0036] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0037] The above are only specific implementation manners of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A GIS structure for assembling a reserved interval without power outage of a double busbar is arranged between a first main busbar (10), a second main busbar (20) and a GIS expansion component, and is characterized in that, Comprising: The first main bus disconnector gas chamber (30), the second main bus disconnector gas chamber (40), the transition gas chamber (50), and the interface gas chamber (60); a first disconnector DS10 is arranged in the first main bus disconnector gas chamber (30), and a second disconnector DS20 is arranged in the second main bus disconnector gas chamber (40); The transition gas chamber (50) is arranged between the first main bus disconnector gas chamber (30), the second main bus disconnector gas chamber (40), and the interface gas chamber (60). The connecting conductor in the transition gas chamber (50) is connected to the connecting conductors of the first main bus disconnector gas chamber (30), the second main bus disconnector gas chamber (40), and the interface gas chamber (60) respectively through gas compartment pot-type insulators. The transition gas chamber (50) has a tee structure, and the connecting conductor inside the transition gas chamber (50) also has a tee structure; The interface gas chamber (60) is provided with an expansion interface for the GIS expansion component.

2. The GIS structure with reserved intervals for double-busbar power-off assembly according to claim 1, characterized in that, One end of the first main bus disconnector gas chamber (30) is butted against the independent gas chamber where the first main bus (10) is located, and the connecting conductor in the first main bus disconnector gas chamber (30) is connected to the first main bus (10) through a gas compartment pot-type insulator; the other end of the first main bus disconnector gas chamber (30) is butted against one end of the transition gas chamber (50), and one branch of the connecting conductor in the transition gas chamber (50) is connected to the connecting conductor in the first main bus disconnector gas chamber (30) through a gas compartment pot-type insulator.

3. The GIS structure with a reserved interval for live installation of the double busbar according to claim 1, characterized in that, One end of the second main bus disconnector gas chamber (40) is butted against the independent gas chamber where the second main bus (20) is located, and the connecting conductor in the second main bus disconnector gas chamber (40) is connected to the second main bus (20) through a gas compartment pot-type insulator; one end of the second main bus disconnector gas chamber (40) is butted against one end of the transition gas chamber (50), and one branch of the connecting conductor in the transition gas chamber (50) is connected to the connecting conductor in the second main bus disconnector gas chamber (40) through a gas compartment pot-type insulator.

4. The GIS structure with a reserved interval for live assembly of a double busbar according to claim 1, characterized in that, Any one of the connecting conductors of the first main bus disconnector gas chamber (30), the connecting conductor of the transition gas chamber (50), or the connecting conductor of the second main bus disconnector gas chamber (40) is connected to a grounding switch ES10.

5. A GIS structure for the maintenance of an operating interval of a double busbar without power interruption, based on the GIS structure of the double busbar without power interruption and assembled with a reserved interval according to claims 1-4, characterized in that, The GIS expansion component is assembled at the interface gas chamber (60). The GIS expansion component includes: a connecting conductor and a contact seat for replacing the voltage withstand shielding cover in the interface gas chamber (60), several current transformers, a cylinder body, a circuit breaker, an outgoing side disconnector and a grounding switch, a GIS overhead line outgoing bushing, and a power cable interface; The operation interval built in the first phase of the project is consistent with the GIS structure of the double-bus non-stop maintenance operation interval.

6. A method for assembling a double busbar without power interruption, which is applied to the GIS structure with reserved intervals for assembling a double busbar without power interruption as described in any one of claims 1-4, characterized in that, Comprising: When expanding the GIS structure of the reserved interval for live installation of double busbars, open the first disconnector DS10 and the second disconnector DS20 of the GIS structure of the reserved interval for live installation of double busbars, close and ground the earthing switch ES10 of the GIS structure of the reserved interval for live installation of double busbars, recover part of the insulating gas in the transition gas chamber to reduce the insulating gas pressure in the transition gas chamber to about 1 / 2 of the rated pressure; recover the insulating gas in the interface gas chamber, open the end cover of the interface gas chamber, expose the interface gas chamber to the air, and carry out the assembly work of the GIS expansion components.

7. A method for overhauling a double busbar without power outage, which is applied to the GIS structure of the double busbar overhaul operation interval without power outage described in claim 5, and is characterized in that, Including: When overhauling the circuit breaker and current transformer in the GIS structure of the maintenance operation interval of double busbars without power interruption, open the first disconnector DS10 and the second disconnector DS20 of the GIS structure of the maintenance operation interval of double busbars without power interruption, close and ground the earthing switch ES10 of the GIS structure of the maintenance operation interval of double busbars without power interruption, recover part of the insulating gas in the transition gas chamber to reduce the insulating gas pressure in the transition gas chamber to about 1 / 2 of the rated pressure; recover the insulating gas in each gas chamber between the transition gas chamber and the overhead outgoing bushing or the power cable joint according to the needs of the overhaul site, and carry out the overhaul work of the circuit breaker, current transformer, outgoing side disconnector and earthing switch, GIS overhead line outgoing bushing and power cable interface.

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