Compact underground GIS for high voltage gas insulated substations (GIS), busbars and pipelines (GIL)

Abstract

This invention relates to a modular, compact arrangement (200) of three phases (A, B, C) of a gas-insulated device (100) suitable for placement in a tunnel or pipe (106) or other confined space. According to the invention, the three phases (A, B, C) are arranged in a triangular or side-by-side configuration on mounting components (103, 104) comprising a roller system (105; 105a, 105b, 105c, 105d). This allows the insertion of such a three-phase assembly (100) into a confined space, such as a pipe or tunnel (106), without the need for workers or machinery to enter. Furthermore, the invention relates to a method for assembling and installing such a three-phase arrangement (100) into a confined space (106).

Description

Technical Field

[0001] This disclosure relates to the fields of high-voltage and medium-voltage gas-insulated switchgear (GIS), gas-insulated busbars, and gas-insulated wires (GIL). A modular, compact arrangement of three phases of a gas-insulated device is disclosed, suitable for placement in tunnels, pipelines, or other confined spaces. Furthermore, this disclosure relates to methods for assembling and installing such a three-phase arrangement into confined spaces. Background Technology

[0002] JP9121437A2 was first disclosed on May 6, 1997, under the name of Hitachi Ltd. It relates to a gas-insulated line (GIL) for use in a large circular tunnel. Two linearly arranged three-phase single-phase encapsulated gas-insulated line GILs are fixedly installed in the tunnel. A trench is provided in the center of the tunnel floor. The trench provides workspace for personnel and storage space for equipment. It also prevents water from seeping into equipment within the tunnel, can be used to store or install additional gas-insulated line GILs, and can accommodate exhaust pipes and water supply pipes. A transfer carriage for mounting the gas-insulated line GIL housings is movable on the floor above the trench.

[0003] JP51685, first published in 1976, also discloses a large, accessible circular tunnel for installing and housing cables. The tunnel contains multiple three-phase delta cable systems arranged in two vertical stacks. The tunnel is cooled via hoses connected to a cooling system.

[0004] CN106207812A was first published on December 7, 2016, in the name of China Western Electric Co. It relates to a method for installing a rigid gas-insulated transmission line (GIL) in a large semi-circular tunnel having tracks for moving transport vehicles and installation vehicles equipped with support arms for supporting and moving the GIL. During installation, the wheels provide relative movement between the transport and installation vehicles and the transfer vehicle, as well as between the transfer vehicle and the gas-insulated pipeline GIL. These wheels are obstructed during the transport of a gas-insulated switchgear (GIS) on the transport and installation vehicles through the tunnel.

[0005] CN203933009U was first published on November 5, 2014, under the name of National Grid Corporation of China, etc. It relates to an AC ultra-high voltage (UHV) cross-river transmission system in a large, accessible tunnel. The gas-insulated pipeline (GIL) can be installed as a straight line or a vertical V-shaped line. In the V-shaped line, the two sections of the gas-insulated pipeline GIL are connected by a bend. The gas-insulated pipeline GIL is filled with SF6 gas or an SF6 / N2 gas mixture or compressed air. The transmission pipeline is located on both banks of the waterway and can be in the form of a vertical or inclined shaft.

[0006] In known tunnel installations, these three phases can be placed on either side of the tunnel (vertically); at the bottom of the tunnel (e.g., above or below the road surface); or at the top of the tunnel (allowing access for people or machinery on the ground), providing additional space for personnel within the tunnel. Therefore, a significant amount of space is required, increasing the cost of tunnel construction, which increases with the square of the tunnel diameter. Rectangular tunnels can be used for side-by-side arrangements of the three phases. Similarly, during the installation, maintenance, or repair of gas-insulated pipelines, substantial space is required to provide equal access to each phase for personnel. Summary of the Invention

[0007] Therefore, the object of the present invention is to provide an improved gas-insulated pipeline or its line-segment module, which is particularly suitable for installation in tunnels and allows the space required for accessibility, assembly, disassembly and maintenance of the gas-insulated pipeline to be kept to a minimum.

[0008] These objectives are achieved through the subject matter of the independent claims. Further improvements are provided by some embodiments given in the dependent claims and combinations of claims.

[0009] According to the present invention, a gas-insulated pipeline has a longitudinal axis, includes phases having single-phase housings aligned parallel to each other, and is divided into segments having a length, wherein at least one of the segments includes: at least one fixing device arranged at at least one longitudinal position of the segment for fixing the single-phase housings of the segment relative to each other, thereby mounting the single-phase housings of the segment together and forming a unitary line-segment module.

[0010] Compared to known systems, such gas-insulated pipelines offer a variety of advantages. Very compact modules can be created by forming line-segment modules directly from the fixture and three single-phase housings. These line-segment modules can reduce lateral or radial space requirements and can be easily installed in narrow, confined spaces such as pipes or tunnels. Furthermore, the availability of modular line-segment modules allows for the creation of individually maneuverable and movable units, for example, on-site or within pipe or tunnel installations. Modular line-segment modules are mechanically stable when pushed into or pulled out of pipes or tunnels, particularly along their length. This significantly simplifies the construction of gas-insulated pipelines and their installation in confined spaces such as underground pipes or tunnels. Moreover, the size of the confined space can be reduced, requiring less foundation work time and cost.

[0011] By providing a first fixing device at a first longitudinal position of the line segment for fixing the single-phase housings of the line segment relative to each other at the first longitudinal position, and a second fixing device at a second longitudinal position of the line segment for fixing the single-phase housings of the line segment relative to each other at the second longitudinal position, the single-phase housings of the line segment can be assembled together to form a unitary line-segment module, achieving excellent results. This further improves the mechanical stability of the unitary line-segment module.

[0012] Excellent results can be achieved by providing a moving device for the line-segment module to facilitate its movement (particularly by applying a pushing or dragging force to the line-segment module at its longitudinal end position). Specifically, the moving device includes or is used for supporting and moving, particularly pushing or dragging, the line-segment module.

[0013] In an embodiment, the mobile device may be arranged in each fixed device and / or adapted to support and allow the rolling of the line segment module in confined spaces, particularly confined spaces that are inaccessible to or cannot be accessed by personnel in a vertical position.

[0014] In an embodiment, a moving device, particularly a roller, may be installed in each fixed device such that the outer contour of the moving device conforms to the bottom of the confined space, particularly to the round bottom of a pipe or the flat bottom of a tunnel.

[0015] In an embodiment, the moving device, particularly the first and second rollers in each fixed device, can be permanently mounted on the line segment module. Additionally, the moving device can be configured to: insert the line segment module into a confined space during installation, and / or remove the line segment module from the confined space for maintenance or repair, and / or compensate for the thermal expansion of the gas-insulated pipeline during operation.

[0016] In an embodiment, the gas-insulated pipeline may include three phases having a single-phase housing, wherein fixing devices, particularly first and second fixing devices, fix the three phases in a triangular arrangement.

[0017] In an embodiment, the gas-insulated pipeline may include three phases having single-phase housings, and fixing devices, particularly first and second fixing devices, to fix the three phases in a triangular arrangement.

[0018] In an embodiment, each single-phase housing of the gas-insulated pipeline may include a first housing tube and a second housing tube, and a connection between them. Both the first and second housing tubes have a longitudinal axis and a radial thickness. The connection provides an airtight connection between a first end of the first housing tube and a second end of the second housing tube. The connection seals a gas discharge path airtightly by providing a sealing element between the first and second ends. The gas discharge path is formed between the first and second ends and begins inside the first and second housing tubes and ends outside the first and second housing tubes. The gas discharge path has a first segment whose extension direction has a directional component parallel to the longitudinal axis, and the sealing element is disposed in the first segment.

[0019] This design allows for an extended gas venting path between the ends of the housing tubes, or a gas venting path that is minimized in the radial direction (when viewed in the center-length section of the housing), thereby improving the seal without increasing the radial range of the integrated flange design. Additionally, the partial axial direction of the gas venting path allows for multiple sealing rings to be continuously installed along the gas venting path.

[0020] In an embodiment, the thermal expansion of the gas-insulated pipeline, particularly during operation, can be compensated by providing: fixing the gas-insulated pipeline to a first reference location at a first longitudinal fixed position, particularly at a first end position; fixing the gas-insulated pipeline to a second reference location at a second longitudinal fixed position, particularly at a second end position; providing a length compensation element between the first and second longitudinal fixed positions in the gas-insulated pipeline, particularly between two line-segment modules; and arranging an unobstructed movement device, particularly rollers, for the line-segment modules between the first and second longitudinal fixed positions to allow movement due to thermal expansion or contraction of the gas-insulated pipeline between the first and second longitudinal fixed positions.

[0021] In the embodiments, flexible angle units are present in the gas-insulated pipeline, particularly between two line-segment modules, to provide a non-linear gas-insulated pipeline.

[0022] The present invention also relates to a line-segment module for gas-insulated pipelines, particularly for gas-insulated pipelines disclosed herein, the line-segment module having a segment length and comprising: a phase encapsulated by single-phase housings aligned with each other; and at least one fixing device arranged at at least one longitudinal position of the line-segment module for fixing the single-phase housings of the line segment relative to each other, thereby mounting the single-phase housings together to form a unitary line-segment module.

[0023] In an embodiment of the line-segment module, the fixing device may be or include: a first fixing device located at a first longitudinal position of the line-segment module for fixing the single-phase housings of the line segments relative to each other at the first longitudinal position; and a second fixing device located at a second longitudinal position of the line-segment module for fixing the single-phase housings of the line segments relative to each other at the second longitudinal position, thereby mounting the single-phase housings of the line segments together to form a unit-type line-segment module.

[0024] In embodiments, the line-segment module may include, or at least one of, the following: gas-insulated busbars; gas-insulated connecting elements; gas-insulated switchgear (GIS), such as disconnectors, circuit breakers; or other electrical components.

[0025] In another aspect, the present invention relates to a system comprising: a gas-insulated pipeline having line-segment modules, particularly the gas-insulated pipeline disclosed herein; and a confined space providing a volume for accommodating said gas-insulated pipeline.

[0026] In embodiments of the system, the confined space is connected to at least one manhole, which is accessible to personnel for the installation, maintenance, and / or removal of line segment modules.

[0027] In an embodiment of the system, the at least one inspection well is located at the beginning, end, and / or middle position of the gas-insulated pipeline and has an inspection well length greater than the segment length of the line-segment module, particularly an inspection well length greater than 6m, 8m, or 10m.

[0028] In embodiments of the system, the gas-insulated pipelines are arranged in a phased polygonal configuration, preferably a three-phase star-triangle configuration, particularly as disclosed in this invention, and the confined space has a clear cross-section having at least a partially approximately circular shape (e.g., an arched tunnel) or at least a partially circular shape (e.g., a circular pipe).

[0029] In other embodiments of the system, the gas-insulated pipelines are arranged linearly in at least three phases, particularly the linear arrangement of the three phases and optionally a spare phase disclosed in this invention, and the confined space has a clear cross-section with a flat bottom.

[0030] In embodiments of the system, the first critical lateral dimension of the clearly defined cross-section of the confined space, particularly the inner diameter, inner height, or inner width, is less than 50%, preferably less than 30%, more preferably less than 20%, and most preferably less than 10% larger than the second critical lateral dimension of the cross-section of the gas-insulated pipeline, particularly the outer diameter, outer height, or outer width, of the gas-insulated module. Specifically, the first critical lateral dimension of the confined space, particularly the inner diameter, is approximately 0.5 meters for a 100kV gas-insulated pipeline and approximately 1.2 meters for a 550kV gas-insulated pipeline.

[0031] In another aspect, the present invention relates to a method for installing a gas-insulated pipeline in a confined space, particularly a gas-insulated pipeline disclosed herein, the gas-insulated pipeline having a longitudinal axis, including a phase having a single-phase housing, and being divided into segments, the method comprising the following steps:

[0032] a. Align the three single-phase shells of the line segment.

[0033] b. By means of at least one fixing device, particularly by means of a first fixing device located at a first longitudinal position of the line segment and a second fixing device located at a second longitudinal position of the line segment, three single-phase housings are fixed together to form a unitary line-segment module, and

[0034] c. Connect the line segment module to one end of an assembled portion of a gas-insulated pipeline located in a confined space, such as a pipe or tunnel.

[0035] In the embodiment, method element c includes method elements d and e:

[0036] d. Insert the molded or machined end of the line-segment module into the molded or machined end of the assembled portion of the gas-insulated pipeline to provide a flange connection, and

[0037] e. The flange connection is secured by a bracket that can be flexibly opened and closed, and optionally by a fixing rod and / or heat shrink tubing.

[0038] In this embodiment, the method includes the following method elements:

[0039] f. Filling the gas volume of three single-phase housings with insulating gas under elevated gas pressure, particularly with air, SF6, alternative gases, or gas mixtures or combinations thereof under overpressures in the range of 3 bar to 8 bar.

[0040] In an embodiment, the method includes the following steps:

[0041] g. A supply pipe is arranged at the top of the online segment module and connected to the mating end of the supply pipe of the assembled section of the gas-insulated pipeline, and / or

[0042] h. Provide a movable device, in particular a roller, that is permanently mounted on the at least one fixed device.

[0043] In this embodiment, the method includes the following method elements:

[0044] i. By pushing or pulling, the gas-insulated pipeline (100) with the connected line-segment module (102) is moved or rolled into the confined space (106), and particularly

[0045] j. Repeat steps a. to i.

[0046] In an embodiment, the method may further include removing the gas-insulated pipeline (e.g., by performing method elements a to i in the reverse manner).

[0047] In embodiments of the method, the moving device, particularly the rollers, is used for at least one of the following: inserting the line segment module into a confined space during installation, removing the line segment module from the confined space for maintenance or repair, and compensating for thermal expansion of the gas-insulated pipeline after installation or during operation.

[0048] In this invention, the terms “radial,” “axial,” “center length section,” and “circumference” refer to the longitudinal axis z of the outer shell, or the basic cylindrical shape or symmetry of the outer shell.

[0049] It should be understood that the foregoing general description and the following detailed description present embodiments with optional features and are intended to provide an overview or framework for understanding the nature and features of the invention. The accompanying drawings are provided to provide a further understanding and are incorporated into and constitute a part of this specification.

[0050] The accompanying drawings illustrate various embodiments and, together with the specification, serve to explain by example the principles and operation of the disclosed concepts. Attached Figure Description

[0051] The contents of this invention will be more fully understood from the following detailed description and accompanying drawings, which should not be construed as limiting the invention as described in the appended claims. Various embodiments are illustrated in the drawings, wherein:

[0052] Figure 1 A cross-sectional length view of a system comprising gas-insulated pipelines arranged in underground conduits, the gas-insulated pipelines being arranged in a phase polygonal, particularly triangular, arrangement.

[0053] Figure 2 A cross-sectional view showing a triangular arrangement of three single-phase encapsulated gas-insulated lines and a supply pipe arranged in a tube;

[0054] Figure 3 A perspective view of a triangular fixing device with three-phase fixing elements and rollers is shown;

[0055] Figure 4 Show Figure 3 A front view of an embodiment in a tube;

[0056] Figure 5 A front view of a triangular fixing device with three-phase fixing elements and spring-loaded rollers is shown.

[0057] Figure 6 A cross-sectional length view of a system comprising gas-insulated pipelines arranged linearly within an underground rectangular tunnel is shown.

[0058] Figure 7 A cross-sectional view showing the linear arrangement of three single-phase encapsulated gas-insulated pipelines in the tunnel;

[0059] Figure 8 A perspective view of a linear fixing device with three-phase fixing elements and rollers is shown;

[0060] Figure 9 Detailed views showing partial cross-sectional length views of the integrated flange design; and

[0061] Figure 10 A cross-sectional length view of the length compensation element is shown. Detailed Implementation

[0062] Detailed reference numerals will now be used to describe certain embodiments, examples of which are illustrated in the accompanying drawings, showing some, but not all, features. The embodiments disclosed in this invention may be embodied in many different forms and should not be construed as limiting; rather, these embodiments are provided to enable the invention to meet applicable legal requirements. Similar reference numerals will be used to denote similar parts or components whenever possible.

[0063] Figure 1 The diagram shows a longitudinal cross-sectional overview of system 200, which includes a single-phase enclosed gas-insulated conduit 100, particularly a straight busbar 100, arranged within a tunnel or conduit 106. The gas-insulated conduit 100, or generally a gas-insulated device 100, has a single-phase housing, which may be arranged in a polygonal configuration, for example… Figure 2 The three phases A, B, and C shown are arranged in a triangular star shape 101A, 101B, and 101C, or alternatively, in a quadrilateral arrangement (not shown) including the three (active) phases A, B, and C and a spare phase, or in a pentagonal arrangement (not shown) including the three (active) phases A, B, and C, a spare phase, and additional space for a supply pipe for receiving other media.

[0064] In embodiments, even more phases are possible, such as in a dual-bus configuration, and can be arranged in the tunnel or duct 106. For example, six or seven phases (including, for example, spare phases) can be arranged in a pentagon or hexagon (i.e., generally a circle) and / or have an additional phase at the center for installation in the duct. Alternatively, six or seven phases can be arranged in a linear side-by-side arrangement or two triangular arrangements side-by-side in a flatter tunnel.

[0065] Now combine Figure 2 To elaborate Figure 1 The single-phase housings 101A, 101B, and 101C are hermetically sealed and preferably made of metal. Each housing 101A, 101B, and 101C houses a central conductor 12 suspended in an insulating gas chamber 13.

[0066] The gas-insulated pipeline 100 may have a longitudinal axis z, which may be straight or may include certain bends in the horizontal and / or vertical directions, depending on the needs or shape of the tunnel or pipeline 106. The gas-insulated pipeline 100 may include three electrical phases A, B, and C having single-phase housings 101A, 101B, and 101C, which are aligned parallel to each other and divided into segments 101 having a segment length 101L. At least one, and preferably each segment 101, may include at least one fixing device 103, 104, arranged at longitudinal positions 103z, 104z of the segment 101 for securing the single-phase housings 101A, 101B, and 101C of the segment 101 relative to each other. Preferably, the first fixing device 103 can be arranged at the first longitudinal position 103z of the line segment, for fixing the single-phase housings 101A, 101B, and 101C of the line segment 101 relative to each other at the first longitudinal position 103z, and the second fixing device 104 can be arranged at the second longitudinal position 104z of the line segment 101, for fixing the single-phase housings 101A, 101B, and 101C of the line segment 101 relative to each other at the second longitudinal position 104z. In this way, the single-phase housings 101A, 101B, and 101C of the line segment 101 can be installed together to form a unit-type line-segment module 102.

[0067] The single-phase housings 101A, 101B, and 101C are preferably made of metal and are respectively hermetically sealed and longitudinally segmented. Each housing 101A, 101B, and 101C houses a central conductor 12 suspended in an insulating gas chamber 13.

[0068] Therefore, each line-segment module 102 forms a fully functional segment of the gas-insulated conduit 100. The gas chamber 13, enclosed by housings 101A, 101B, and 101C, is filled with insulating gas under elevated pressure. Specifically, technical air (80% N2, 20% O2) can be used as the insulating gas. Typical insulating gas pressures are in the range of 3 bar to 10 bar.

[0069] like Figure 2 As shown, the three phases A, B, and C can be arranged in a triangular configuration, and preferably at the same distance z from the center of the pipe 106. The pipe diameter is slightly larger than the outer diameter of the three phases A, B, and C arranged in a triangle.

[0070] like Figures 2 to 5 As shown, each fixing device 103, 104, particularly the first fixing device 103 and the second fixing device 104, may include a triangular fixing element 108, particularly a triangular fixing plate 108, which is shaped and arranged to fit in an intermediate volume between single-phase housings 101A, 101B, 101C, and provides a mounting device 108a for mounting the phase fixing element 109 and / or the moving device 105 thereon.

[0071] In an embodiment, the fixing element 108 may be star-shaped, having a connection with the single-phase housings 101A, 101B, 101C (or as shown in the example). Figure 9 , 10 The cutouts of the outer diameter of the housing 1 or housing tubes 2, 3 shown are matched. The fixing element 108 can be placed at the center of the pipe 106. The phase fixing element or band 110 can be wrapped around each single-phase housing 101A, 101B, 101C or housing 1 or housing tubes 2, 3 and fixed to the triangular fixing element 108. The phase fixing element 109 can have a partially annular shape for surrounding and fixing the single-phase housing 101A, 101B, 101C and for installation, particularly threaded connection, to the triangular fixing element 108.

[0072] In the embodiment, the fixing devices 103, 104, particularly the first and second fixing devices 103 and 104, preferably the triangular fixing element 108, can fix the three single-phase housings 101A, 101B, 101C into a triangle, wherein the third phase C or its single-phase housing 101C can be placed at the center of the base of the triangle (e.g., with an angular tolerance of, for example, ±15°), and the first phase A or its single-phase housing 101A and the second phase B or its single-phase housing 101B are placed laterally above the third phase C or its single-phase housing 101C.

[0073] In its embodiment, the first and second fixing devices 103, 104, particularly the triangular fixing element 108, can fix the three single-phase housings 101A, 101B, 101C into a triangle. When the triangle is inscribed in a circle with a apex of 0°, it can have a first phase A at an angular position, for example, between 285° and 310° and preferably at about 300°; a second phase B at an angular position, for example, between 50° and 75° and preferably at about 60°; and a third phase C at an angular position, for example, between 170° and 190° and preferably at about 180°. The advantage of widening the distance or angle between the phase housings 101A and 101B is that it provides more space for the optional supply conduit 114.

[0074] In an embodiment, the supply conduit 114 can be arranged in free space, preferably above and / or between the single-phase housings 101A, 101B, and 101C, and can be adapted to receive at least one of the following: power cables, network cables, fiber optic cables, gas pressure supply conduits, other medium supply lines, and other low-voltage cables. Therefore, the supply conduit 114 can be placed in the gap between the top phase housings 101A and 101B and secured to the triangular fixing element 108, and can extend parallel to the gas-insulated conduit 100.

[0075] In the embodiment, the fixing devices 103, 104, particularly the first and second fixing devices 103, 104, and preferably their triangular fixing element 108, can each be fixed to a first roller 105a placed in the gap on the left side of the third phase C or its single-phase housing 101C and a second roller 105b placed in the gap on the right side of the third phase C or its single-phase housing 101C, wherein the height of the first roller 105a and the second roller 105b is selected to be suitable for carrying the weight of the segment or line-to-segment module 102 of the gas-insulated pipeline 100, particularly suitable for contacting the inner surface of the pipe 106.

[0076] In an embodiment, the first and second fixing devices 103 and 104 may each include a first moving device 105a, particularly a first roller 105a, which, when inscribed in a circle with a top of 0°, is arranged in the range of, for example, 110° to 135° and preferably at an angular position of about 120°, and a second moving device 105b, particularly a second roller 105b, which is arranged in the range of, for example, 225° to 250° and preferably at an angular position of about 240°.

[0077] like Figure 2 and Figure 5As shown, the moving device 105, particularly the first rollers 105a and 105c fixed to the first fixing device 103 and the second rollers 105b and 105d fixed to the second fixing device 104, can be equipped with a spring mechanism 107 to provide elastic suspension for the line segment module 102. Alternatively or further, the moving device 105 or the rollers 105a, 105c, 105b, 105d can have an elastic surface layer, for example, with a thickness of 4 mm or more, which also provides or contributes to the elastic suspension of the line segment module 102. Therefore, the spring 107 and / or each roller 105a, 105b (and...) Figures 7 to 8 The elastic surface layer (similar to 105c, 105d) can balance the weight of the line segment module 102 on the two rollers 105a, 105b and compensate for unevenness, obstacles, etc. at the bottom. The elastic force in the normal position can be selected as half the weight of the line segment module 102.

[0078] like Figures 6 to 8 As shown, the gas-insulated pipeline 100 or its line-segment module 102 may include three phases A, B, and C having single-phase housings 101A, 101B, and 101C, wherein fixing devices 103 and 104, particularly the first and second fixing devices 103 and 104, fix the three phases A, B, and C in a linear arrangement, preferably side-by-side. Furthermore, at least a fourth phase, such as a spare phase, may be arranged in the line-segment module 102 and may be fixed in a linear arrangement by the (first and second) fixing devices 103 and 104.

[0079] like Figures 7 to 8 As shown, each fixing device 103, 104, particularly the first and second fixing devices 103, 104, may include three phase fixing elements 110 fixed side by side to each other. In an embodiment, each phase fixing element 110 may include a partially circular upper fixing ring 110a and a partially circular lower fixing ring 110b for surrounding and thereby fixing the single-phase housings 101A, 101B, 101C of the corresponding phases A, B, C.

[0080] Each fixing device 103, 104 may include a moving device 105, particularly rollers 105c, 105d, which are respectively installed at the lateral end positions and / or the middle positions between the phase fixing elements 109 of each fixing device 103, 104.

[0081] Combination Figure 1 or Figure 6The system 200 will be further and exemplary described in detail below. As shown, each line segment module 102 and the gas-insulated conduit 106 assembled therefrom can be abutted against rollers 105a, 105b; 105c, 105d as a whole. Rollers 105a, 105b; 105c, 105d can be placed along the gas-insulated conduit 100 at a certain interval, for example, evenly spaced. A preferred interval may be every few meters.

[0082] In an embodiment of the system 200, the confined space 106 is inaccessible or impassable to personnel in a vertical position. Preferably, the confined space 106 may be connected to at least one manhole 201, which is accessible to personnel for the installation, maintenance, and / or removal of the line segment module 102.

[0083] The conduit 106 (or tunnel or other laterally confined space 106) may be laid above or below the ground 106 along the planned path of the gas-insulated conduit 100. The conduit 106 may be sealed and connected to a manhole 201 at each end. Additional manholes (not shown) may be used along the gas-insulated conduit 100, every few 100 meters or at each bend. The manhole 201 at each end is used to connect the gas-insulated conduit 100 via a sleeve 204 and / or a vertical gas-insulated conduit segment 203 to, for example, an air-insulated wire 205, or via a cable terminal (not shown) to other switchgear components or a substation, or to a high-voltage cable. The conduit 106 is preferably clean and watertight internally. The system 200 as a whole may be an energy transmission and distribution system 200.

[0084] The inspection well 201 is used to assemble gas-insulated pipelines 100 in segments or sections 101, particularly in line-segment modules 102. For example, according to Figure 2Each segment or section 101 or line-segment module 102 of the pre-assembled three-phase gas-insulated pipeline 100 can be several meters long and is lowered into the manhole 201. The pre-assembly or assembly of the line-segment module 102 disclosed in this invention can also be completed within the manhole 201. Rollers 105a, 105b are then placed inside the pipe 106, and the gas-insulated pipeline segment 101 or line-segment module 102 is rolled into the pipe 106 until the end reaches the pipe inlet. At this point, the next gas-insulated pipeline segment or line-segment module 102 is lowered into the manhole 201, and all three phases A, B, C and optional supply pipes 114 are connected to the previous line-segment module 102. The assembly is then pushed further into the pipe 106, and this process is repeated. For this process, the length 201L of the manhole 201 can be selected to be longer than the length 101L of the gas-insulated pipeline segment 101 or line-segment module 102. The length of the inspection well can be selected, for example, from 6m to 14m, preferably from 6m to 8m, and the length of the module 101L can be selected, for example, from 2m to 12m, preferably from 4m to 10m.

[0085] In an embodiment of the system 200, the confined space 106 may be selected, for example, from: pipe 106, existing unused pipes, water pipes, sewage pipes, tunnel 106, underground tunnels, tunnels in the soil, tunnels under the road surface, and combinations thereof.

[0086] The at least one inspection well 201 may be equipped with inspection well equipment 202, for example, selected from the group consisting of: an installation unit for the line-segment module 102, a disassembly unit for the line-segment module 102, a connection unit for connecting the line-segment modules 102 together and / or connecting them with the length compensation element 111 and / or with the flexible angle element 113, a gas filling device, a monitoring device for monitoring the gas-insulated pipeline 100 during operation, air cooling and blowing equipment, and combinations thereof.

[0087] Compact flange design

[0088] International application PCT / EP2020 / 070540, filed by the same applicant on the same date, is hereby incorporated in its entirety by reference. The aforementioned application relates to a compact integrated flange design. The entire contents of the general specification and all other relevant documents are incorporated herein by reference. Figures 1 to 6 The related descriptions and all claims, which are incorporated herein by reference as clauses.

[0089] Compact flange design 4 Figure 9The following is an exemplary illustration. Each single-phase housing 101A, 101B, 101C of the gas-insulated conduit 100 may include a first housing tube 2 and a second housing tube 3, and a connection 4 between them. The first housing tube 2 and the second housing tube 3 each have a longitudinal axis z and a radial thickness d. The connection 4 is used to provide an airtight connection between a first end 20 of the first housing tube 2 and a second end 30 of the second housing tube 3. The connection 4 provides sealing elements 5; 5a, 5b between the first end 20 and the second end 30 to airtightly seal a gas discharge path L. The gas discharge path L is formed between the first end 20 and the second end 30 and begins inside the first and second housing tubes 2, 3 at 6 and ends outside the first and second housing tubes 2, 3 at 7. The gas discharge path L has a first segment L1, the extension direction of which has a directional component parallel to the longitudinal axis z, and the sealing elements 5; 5a, 5b are disposed in the first segment L1. In an embodiment, the first end 20 may include a first connecting surface 21, the second end 30 may include a matching second connecting surface 31, and a gas discharge path L is formed between the first connecting surface 21 and the second connecting surface 31.

[0090] In another aspect of the integrated flange design 4, each single-phase housing 101A, 101B, 101C of the gas-insulated pipeline 100 may include a first housing tube 2 and a second housing tube 3 and a connection portion 4 between them. The first housing tube 2 and the second housing tube 3 both have a longitudinal axis z and a radial thickness d. The connection portion 4 is used to provide an airtight connection between a first end 20 of the first housing tube 2 and a second end 30 of the second housing tube 3. A first connection surface 21, in particular a first protrusion 22 and / or a first recess 23, is formed or machined in the first end 20, and a second connection surface 31, in particular a second protrusion 32 and / or a second recess 33, is formed or machined in the second end 30.

[0091] In an embodiment of the integrated flange design 4, before forming or machining the first connecting surface 21 and the second connecting surface 31, the first end 20 has the same inner and outer diameters as the first outer casing tube 2; and / or the second end 20 has the same inner and outer diameters as the second outer casing tube 3; and / or the first end 20 and the second end 30 have the same inner and outer diameters. Specifically, the first outer casing tube 2 and the second outer casing tube 3 can be made of metal, with a thickness of several mm, preferably in the range of 6 mm to 15 mm, and more preferably 8 mm to 12 mm.

[0092] In one embodiment, the connecting portion 4 includes brackets 9, 9' surrounding the first end 20 and the second end 30 for providing axial fixing force to fix the first end 20 and the second end 30 together.

[0093] The embodiments of the gas-insulated pipeline 100 disclosed in this invention also relate to a length compensation element or unit 111. Thermal expansion of the gas-insulated pipeline 100 during operation can be compensated by providing: fixing the gas-insulated pipeline 100 to a first reference location at a first longitudinal fixed position 100f, particularly at a first end position 100f; fixing the gas-insulated pipeline 100 to a second reference location at a second longitudinal fixed position 100g, particularly at a second end position 100g; arranging the length compensation element 111 between the first and second longitudinal fixed positions in the gas-insulated pipeline 100, particularly between the two line-segment modules 102; and arranging unobstructed moving devices 105, particularly rollers 105a, 105b; 105c, 105d, for the unobstructed movement of the line-segment modules 102 between the first and second longitudinal fixed positions 100f and 100g to allow for small movements due to thermal expansion or contraction of the gas-insulated pipeline 100 between the first and second longitudinal fixed positions 100f and 100g.

[0094] In an embodiment, each single-phase housing 101A, 101B, 101C may include at least one length compensation element 111, which is arranged at one of the connection portions 4 of the first and second housing tubes 2, 3. A first segment L1 of the gas discharge path L extends parallel to the longitudinal axis z of the single-phase housing 101A, 101B, 101C, and axial expansion gaps 112 are provided at both ends of the first segment L1 to allow relative movement between the first end 20 of the first housing tube 2 and the second end 30 of the second housing tube 3, specifically compensating for thermal expansion or contraction or axial length tolerances of the first and / or second housing tubes 2, 3, without affecting the airtight seal between the first end 2 and the second end 3. Advantageously, the moving devices or rollers 105; 105a, 105b, 105c, 105d are permanently installed and remain unobstructed throughout the entire service life of the gas-insulated line 100, particularly for compensating for thermal expansion after installation or during operation of the gas-insulated line 100.

[0095] Figure Labels

[0096] 100 Gas-insulated pipelines and gas-insulated devices

[0097] Diameter, outer diameter, and envelope diameter of a 100d gas-insulated pipeline

[0098] Height, outer height, and maximum height of a 100-hour gas-insulated pipeline

[0099] Width, outer width, and maximum width of a 100W gas-insulated pipeline

[0100] 101 line segment

[0101] 101A, 101B, 101C Single-Phase Enclosures

[0102] 101L line segment length, line segment module length

[0103] 102 line-segment module

[0104] Longitudinal end position of the 102e line-segment module

[0105] 103 First Fixing Device

[0106] 103z First vertical position

[0107] 104 Second fixing device

[0108] 104z Second vertical position

[0109] 105 Mobile devices

[0110] 105a First moving device, first roller

[0111] 105b Second moving device, second roller

[0112] 105c moving device, rollers

[0113] 105d mobile device, rollers

[0114] 106 Confined spaces, pipelines, tunnels

[0115] Diameter, inner diameter, and minimum diameter of a 106d confined space

[0116] Height, internal height, and minimum height of the 106h confined space

[0117] Width, internal width, and minimum width of a 106w confined space

[0118] Spring mechanism of 107 line segment module

[0119] 108 Triangular fixing elements

[0120] 108a Installation device

[0121] 109 Phase fixing element

[0122] 110 Phase fixing element

[0123] 110a Partially circular upper fixing ring

[0124] 110b Partially circular lower fixing ring

[0125] 111 Length compensation element or unit

[0126] 112 Axial expansion clearance

[0127] 113 Flexible angular element or unit

[0128] 114 Supply Pipe

[0129] 13 Insulating gas compartments

[0130] 200 includes systems with gas-insulated pipelines arranged in confined spaces.

[0131] 201 Inspection Well

[0132] 201L inspection well length

[0133] 202 Inspection Well Equipment

[0134] 203 Vertical gas-insulated pipeline segmentation

[0135] 204 casing

[0136] 205 High-voltage or medium-voltage lines (gas-insulated or air-insulated)

[0137] 206 Ground

[0138] Phases A, B, and C, single-package phase

[0139] x, y: Radial direction of the casing or medium- or high-pressure device

[0140] z Longitudinal axis of the casing or medium- or high-pressure unit

[0141] Compact flange design

[0142] 1. Airtight outer shell, metal outer shell

[0143] 1A Busbars, busbar conduits, busbar sections, medium-voltage equipment, high-voltage equipment

[0144] 2 First outer casing tube

[0145] 2a The outside of the first outer casing tube

[0146] The first groove and rectangular groove in 2b and 2a

[0147] 20 First end of the first outer casing tube

[0148] 21 First connecting surface at the first end

[0149] 22 First protrusion on the first connecting surface inside the outer casing

[0150] 22i Inner surface of the first protrusion

[0151] 22o The outside of the first protrusion

[0152] 23 First recess on the first connecting surface outside the housing

[0153] 3 Second outer casing tube

[0154] 3a The outside of the second outer casing tube

[0155] The second groove and rectangular slot in 3b, 3b'3a

[0156] 30 The second end of the second outer casing tube

[0157] 30a Rounded corner edges

[0158] 31 Second connecting surface at the second end

[0159] 32. Second protrusion on the second connecting surface outside the housing

[0160] 33 The second recess on the second connecting surface inside the outer casing

[0161] 4. Connecting parts

[0162] 4a First Embedded Part of the Connecting Part

[0163] 4b The second embedded part of the connecting part

[0164] 5. Sealing elements

[0165] 5a First sealing ring, outer sealing ring

[0166] 5b Second sealing ring, inner sealing ring

[0167] 50 Sealing groove

[0168] 6. The interior of the outer casing tube

[0169] 7. The exterior of the outer casing tube

[0170] 8. Spacers, rear-mounted insulators, disc-shaped insulators, support insulators, and separators.

[0171] 80-slot spacer

[0172] 9 supports

[0173] 9' Extended support, sliding support

[0174] Axial gap in 9a bracket

[0175] 9b Axial extension of the bracket, bracket width

[0176] 9c The thickness of the support (in the radial direction)

[0177] 90 The first edge of the bracket

[0178] 91. Second edge of the bracket

[0179] 91' Modified second edge, sliding edge of the bracket

[0180] 10 Fixed rods

[0181] 11 Heat shrink tubing

[0182] 12 conductors

[0183] 13 Insulating gas compartments

[0184] 14 Embedded connection, welded connection

[0185] 100f First longitudinal fixed position

[0186] 100g Second longitudinal fixed position

[0187] 100m movable outer shell

[0188] 111 Length compensation element, length compensation unit

[0189] 112 Axial expansion clearance

[0190] d. Radial thickness of the outer casing tube or its end

[0191] d' Radial thickness of the connection (insert) of the outer casing tube

[0192] d" Reduction in radial thickness of the outer casing tube

[0193] L Gas Exhaust Path

[0194] L1 is the first segment of the gas discharge path with an axial component.

[0195] L2 is the second segment of the gas discharge path with a radial component.

[0196] L2i: The second internal segment of the gas discharge path starting from inside the outer casing.

[0197] L2o is the second segment of the gas discharge path outside the outer casing tube.

Claims

1. A gas-insulated pipeline (100) having a longitudinal axis (z), comprising phases (A, B, C) of mutually parallel and aligned single-phase housings (101A, 101B, 101C) each having its own airtightness, and divided into a plurality of segments (101) having a segment length (101L), characterized in that, At least one of the plurality of line segments (101) includes: At least one fixing device (103, 104), arranged at at least one longitudinal position (103z, 104z) of the line segment (101), is used to fix the single-phase housings (101A, 101B, 101C) of the line segment (101) relative to each other. Thus, the single-phase housings (101A, 101B, 101C) of the line segment (101) are assembled together to form a unit-type line-segment module (102), the line-segment module (102) including a moving device (105) for facilitating the movement of the line-segment module (102); The moving device (105) includes rollers (105a, 105b; 105c, 105d) for supporting and moving the line segment module (102); Each single-phase housing (101A, 101B, 101C) of the gas-insulated pipeline (100) includes a first housing tube (2) and a second housing tube (3) and a connecting portion (4) between them. Both the first housing tube (2) and the second housing tube (3) have a longitudinal axis (z) and a radial thickness (d). The connecting portion (4) provides an airtight connection between a first end (20) of the first housing tube (2) and a second end (30) of the second housing tube (3). The connecting part (4) provides a sealing element (5; 5a, 5b) between the first end (20) and the second end (30), thereby sealing the gas discharge path (L) in an airtight manner. The gas discharge path (L) is formed between the first end (20) and the second end (30), and begins inside (6) of the first and second outer casing tubes (2, 3) and ends outside (7) of the first and second outer casing tubes (2, 3). The gas discharge path (L) has a first segment (L1), the extension direction of which has a directional component parallel to the longitudinal axis (z), and The sealing elements (5; 5a, 5b) are disposed in the first segment (L1).

2. The gas-insulated pipeline (100) according to claim 1, comprising: A first fixing device (103) is located at a first longitudinal position (103z) of the line segment (101) for fixing the single-phase housings (101A, 101B, 101C) of the line segment (101) relative to each other at the first longitudinal position (103z). A second fixing device (104), located at a second longitudinal position (104z) of the line segment (101), is used to fix the single-phase housings (101A, 101B, 101C) of the line segment (101) relative to each other at the second longitudinal position (104z). Thus, the single-phase housings (101A, 101B, 101C) of the line segment (101) are assembled together to form a unit-type line-segment module (102).

3. The gas-insulated pipeline (100) according to claim 1, wherein, The moving device (105) is arranged in each fixed device (103, 104) and is adapted to support and allow the line segment module (102) to roll in a confined space (106).

4. The gas-insulated pipeline (100) according to claim 3, wherein, The confined space (106) is one that is inaccessible or impossible for personnel in a vertical position to enter.

5. The gas-insulated pipeline (100) according to claim 1, wherein, The mobile device (105) is permanently mounted on the line-segment module (102).

6. The gas-insulated pipeline (100) according to claim 5, wherein, The moving device (105) is a first roller (105a; 105c) and a second roller (105b; 105d) in each of the fixed devices (103, 104).

7. The gas-insulated pipeline (100) according to claim 3, wherein, The moving device (105) is installed for at least one of the following: inserting the line segment module (102) into the confined space (106) during installation, removing the line segment module (102) from the confined space (106) for maintenance or repair, and compensating for the thermal expansion of the gas-insulated pipeline (100) during operation.

8. The gas-insulated pipeline (100) according to claim 1, wherein, In each fixed device (103, 104), the moving device (105) is equipped with a spring mechanism (107) or has an elastic surface layer to provide elastic suspension for the line segment module (102).

9. The gas-insulated pipeline (100) according to claim 2, comprising three phases (A, B, C) having single-phase housings (101A, 101B, 101C), wherein, The first and second fixing devices (103, 104) fix the three phases (A, B, C) in a triangular arrangement, wherein each fixing device (103, 104) includes a triangular fixing element (108) which is shaped and arranged to fit in an intermediate volume between the single-phase housings (101A, 101B, 101C) and provides mounting means (108a) for mounting the phase fixing element (109) and / or the moving device (105) thereon.

10. The gas-insulated pipeline (100) according to claim 9, wherein, The first and second fixing devices (103, 104) fix the three single-phase housings (101A, 101B, 101C) in a triangle, with the third phase C placed at the center of the bottom, and the first phase A and the second phase C placed laterally above the third phase C. Each fixing device (103, 104) fixes a first roller (105a) placed in the gap to the left of the third phase C and a second roller (105b) placed to the right of the third phase C, wherein the height of the first and second rollers (105a, 105b) is selected to be suitable for bearing the weight of the line segment module (102).

11. The gas-insulated pipeline (100) according to claim 2, comprising at least three phases (A, B, C) having single-phase housings (101A, 101B, 101C), wherein the first fixing device (103) and the second fixing device (104) fix the three phases (A, B, C) in a linear arrangement, wherein, Each fixing device (103, 104) includes three phase fixing elements fixed side by side to each other.

12. The gas-insulated pipeline (100) according to claim 11, wherein, Each fixing device (103, 104) includes a moving device (105; 105c, 105d) respectively installed at a lateral end position and / or intermediate position between the phase fixing elements (109) of each fixing device (103, 104).

13. The gas-insulated pipeline (100) according to claim 1, wherein, The first end (20) includes a first connecting surface (21), the second end (30) includes a matching second connecting surface (31), and the gas discharge path (L) is formed between the first connecting surface (21) and the second connecting surface (31).

14. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, Each single-phase housing (101A, 101B, 101C) of the gas-insulated pipeline (100) includes a first housing tube (2) and a second housing tube (3) and a connecting portion (4) between them. Both the first housing tube (2) and the second housing tube (3) have a longitudinal axis (z) and a radial thickness (d). The connecting portion (4) provides an airtight connection between a first end (20) of the first housing tube (2) and a second end (30) of the second housing tube (3). The first connecting surface (21) is formed or processed in the first end (20), and The second connecting surface (31) is formed or processed in the second end (30).

15. The gas-insulated pipeline (100) according to claim 1, wherein, The connecting part (4) includes a bracket (9, 9') surrounding the first end (20) and the second end (30) for providing an axial fixing force to fix the first end (20) and the second end (30) together.

16. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, The thermal expansion of the gas-insulated pipeline (100) during operation is compensated by providing the following: The gas-insulated pipeline (100) is fixedly installed to the first reference position at the first longitudinal fixed position (100f); The gas-insulated pipeline (100) is fixedly installed to the second reference position at the second longitudinal fixed position (100g); A length compensation element (111) between the first longitudinal fixed position and the second longitudinal fixed position is arranged in the gas-insulated pipeline (100); as well as A moving device (105; 105a, 105b; 105c, 105d) of the line-segment module (102) is arranged between the first and second longitudinal fixed positions (100f, 100g), the moving device being unobstructed to allow small movements due to thermal expansion or contraction of the gas-insulated pipeline (100) between the first longitudinal fixed position (100f) and the second longitudinal fixed position (100g).

17. The gas-insulated pipeline (100) according to claim 1, wherein, Each single-phase housing (101A, 101B, 101C) includes at least one length compensation element (111) disposed at one of the connection portions (4) of the first and second housing tubes (2, 3), wherein, The first segment (L1) of the gas discharge path (L) extends parallel to the longitudinal axis (z) of the single-phase housing (101A, 101B, 101C), and, An axial expansion gap (112) is provided at both ends of the first segment (L1) to allow relative movement between the first end (20) of the first outer casing tube (2) and the second end (30) of the second outer casing tube (3), in order to compensate for thermal expansion or contraction or axial length tolerance of the first and second outer casing tubes (2, 3) without affecting the airtight seal between the first end (20) and the second end (30).

18. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, In the gas-insulated line (100), there are flexible angle units (113) to provide a non-linear gas-insulated line.

19. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, The length of the segment (101L) is in the range of 2m to 12m.

20. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, The length of the segment (101L) is in the range of 4m to 10m.

21. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein the line-segment module (102) is or includes at least one of the following: a gas-insulated busbar; a gas-insulated connecting element; a gas-insulated switching device.

22. The gas-insulated pipeline (100) according to any one of claims 1 to 12, wherein, The supply pipe (114) is arranged in free space and is adapted to receive at least one of the following: power cable, network cable, fiber optic cable, gas pressure supply pipe, and medium supply line.

23. The gas-insulated pipeline (100) according to claim 22, wherein, The supply pipe (114) is arranged on the upper side and / or between the single-phase housings (101A, 101B, 101C).

24. An energy transmission and distribution system comprising a gas-insulated conduit (100) according to any one of claims 1 to 13; and a confined space (106) providing a volume for accommodating the gas-insulated conduit (100).

25. The system (200) according to claim 24, wherein, The confined space (106) is selected from: existing unused pipes, water pipes, underground tunnels, and combinations thereof.

26. The system (200) according to claim 24, wherein, The gas-insulated pipeline (100) is arranged in a polygonal pattern with multiple phases, and the confined space (106) has a clearly defined cross-section that is at least partially approximately circular or at least partially circular; or The gas-insulated pipeline (100) is arranged linearly in at least three phases, and the confined space (106) has a clear cross-section with a flat bottom.

27. The system (200) according to claim 24, wherein, The confined space (106) is one that cannot be entered by personnel in a vertical position, or that personnel cannot enter.

28. The system (200) according to claim 24, further comprising at least one inspection well connected to the confined space and accessible to personnel for installing, maintaining, and / or removing the line segment module (102); wherein, The at least one inspection well is located at the beginning (100f), end (100g) and / or intermediate position of the gas-insulated pipeline (100), and has an inspection well length (201L) greater than the segment length (101L).

29. The system (200) of claim 24, further comprising additional power transmission and distribution components, said components including: Vertical gas-insulated pipeline segments (203), bushings (204), high-voltage or medium-voltage lines isolated in gas (205), switchgear components, substations.

30. A method for installing a gas-insulated pipeline (100) according to any one of claims 1 to 12 in a confined space (106), the gas-insulated pipeline (100) having a longitudinal axis (z), comprising phases (A, B, C) of single-phase housings (101A, 101B, 101C) each having its own airtightness, and divided into segments (101), the method comprising the following method elements: a. Align the three single-phase shells (101A, 101B, 101C) of line segment (101) parallel to each other. b. The three single-phase housings (101A, 101B, 101C) are fixed together by a first fixing device (103) located at a first longitudinal position (103z) of the line segment (101) and a second fixing device (104) located at a second longitudinal position (104z) of the line segment (101), thereby forming a unit-type line-segment module (102). c. Connect the line-segment module (102) to one end of the assembled portion of the gas-insulated pipeline (100) arranged in a confined space (106), the confined space (106) being a pipe or tunnel; and h. Provide a mobile device (105) permanently mounted on the at least one fixed device (103, 104); in, The moving device (105) includes rollers (105a, 105b; 105c, 105d) for supporting and moving the line segment module (102).

31. The method according to claim 30, wherein, The method element c includes method elements d and e: d. Insert the molded or machined end of the line-segment module (102) into the molded or machined end of the assembled portion of the gas-insulated pipeline (100) to provide a connection (4), and e. The connecting part (4) is fixed by a bracket (9, 9') that can be opened and closed elastically, and the bracket (9, 9') is fixed by a fixing rod (10).

32. The method of claim 30, comprising at least one of the following method elements: f. Fill the gas volume (115) of the three single-phase housings (101A, 101B, 101C) with an insulating gas at elevated gas pressure, with an overpressure of 3 bar to 8 bar, the gas comprising air, SF6, alternative gases or combinations thereof. g. A supply pipe (114) is arranged on top of the line-segment module (102) and connected to the mating end of the supply pipe of the assembled portion of the gas-insulated pipeline (100), and i. The gas-insulated pipeline (100) with the connected line segment module (102) is moved or rolled into the confined space (106) by pushing or pulling.

33. The method according to claim 30, wherein, The moving device (105; 105a, 105b, 105c) is used for at least one of the following: inserting the line segment module (102) into the confined space (106) during installation, removing the line segment module (102) from the confined space (106) for maintenance or repair, and compensating for thermal expansion of the gas-insulated pipeline (100) after installation or during operation.

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