A pre-installed GIL power transmission device and installation method thereof

Abstract

A pre-installed GIL power transmission device and its installation method, which relates to the technical field of power transmission. The device includes a casing inlet and outlet module, a standard module and a cable terminal inlet and outlet module. The standard module is fixedly arranged between the casing inlet and outlet module and the cable terminal inlet and outlet module. The casing inlet and outlet module, the standard module and the cable terminal inlet and outlet module all include prefabricated warehouses, and three-phase GILs are fixedly arranged inside the prefabricated warehouses. The following steps are included: fixing at least one of the casing inlet and outlet module or the cable terminal inlet and outlet module according to the designed position; docking the standard module with at least one of the above two modules; docking the end of the three-phase GIL of the standard module with the end of the three-phase GIL of other modules; selecting the number of standard modules that need to be docked; after the remaining modules are docked, the entire line is debugged. The installation workload is saved, the requirements for on-site civil engineering work are low, and the degree of engineering standardization is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power transmission, and in particular to a pre-installed GIL power transmission device and an installation method thereof. Background Art

[0002] GIL (Gas Insulated Metal Enclosed Transmission Line) is a large-capacity transmission equipment for high voltage, ultra-high voltage and ultra-high voltage, and is widely used in hydropower stations, nuclear power plants, large industrial parks, etc. At present, GIL needs to be installed on-site, usually by means of bracket overhead installation and tunnel excavation installation. Whether it is bracket overhead installation or tunnel excavation installation, a lot of civil engineering work is required in the early stage, which greatly increases the amount of engineering work. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a pre-installed GIL transmission device and an installation method thereof, in which the GIL is designed as a standardized module. Only the foundation needs to be processed on site. After each standard module is transported to the installation site, the standard modules are quickly docked and installed by hoisting installation, which greatly reduces the workload on the project site, especially saves the expenditure on civil engineering projects, improves the GIL installation efficiency, and saves the GIL project construction cost. When an emergency power supply demand occurs, it can also be transported to the site for installation as soon as possible, which can well adapt to the development needs of my country's power industry and ensure power supply.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A pre-installed GIL power transmission device, characterized in that it includes a casing inlet and outlet module, a standard module and a cable terminal inlet and outlet module, the standard module is fixedly arranged between the casing inlet and outlet module and the cable terminal inlet and outlet module, the casing inlet and outlet module, the standard module and the cable terminal inlet and outlet module all include prefabricated bins, three-phase GILs are fixedly arranged inside the prefabricated bins, the three-phase GILs of the casing inlet and outlet module, the standard module and the cable terminal inlet and outlet module are connected end to end in sequence, and three-phase power transmission conductors are fixedly arranged inside the three-phase GILs.

[0006] According to the preferred technical solution, the three-phase GIL is arranged horizontally, and the middle part of the assembled three-phase GIL is arranged in three layers, upper, middle and lower. The two ends of the three-phase GIL are distributed in a stepped shape, and the distances between the three-phase GILs in the horizontal direction are equal and greater than 1 meter.

[0007] According to a preferred technical solution, both ends of the assembled three-phase GIL are vertical, and the distances between the three-phase GILs in the vertical direction are equal.

[0008] According to the preferred technical solution, at least one of the two three-phase GIL ends connected end to end extends to the outside of the prefabricated warehouse, and the other end is recessed into the inner side of the prefabricated warehouse. The length of the three-phase GIL extending to the outside of the prefabricated warehouse is 0.5 to 2 meters, and a unified interface is provided at the end of the three-phase GIL extending to the outside of the prefabricated warehouse.

[0009] According to a preferred technical solution, the three-phase GIL extending from the end of the cable terminal inlet and outlet module is connected to the high-voltage cable terminal head.

[0010] According to a preferred technical solution, the prefabricated warehouse is a square structure, wherein both sides of the upper part are angled slopes with an inclination angle of 10 to 30 degrees.

[0011] The preferred technical solution is that a mechanical ventilation device is arranged at the middle position of the top of the prefabricated warehouse, and the mechanical ventilation device comprises a fixed sleeve, a sliding sleeve, an upper cover, a fixed frame, a rotating frame and a rotating arm, the bottom of the fixed sleeve is fixedly arranged on the upper part of the prefabricated warehouse and the interior of the fixed sleeve is communicated with the interior of the prefabricated warehouse, the sliding sleeve is slidably arranged on the outside of the fixed sleeve, the upper cover is arranged at the upper end of the sliding sleeve and the lower side of the upper cover is hinged to the upper side of the sliding sleeve, the fixed frame is fixedly arranged on the upper part of the fixed sleeve, the rotating frame is rotatably arranged at the middle position of the fixed frame, and the rotating arm is rotatably arranged on the rotating frame; the rotating arm comprises a rotating sleeve rotatably connected to the rotating frame, a lifting control arm is fixedly arranged on one side of the rotating sleeve, a manipulation control arm is fixedly arranged on the other side of the rotating sleeve, a sliding ball is fixedly arranged on the outer end side of the lifting control arm, an arc groove is arranged on the inner side of the sliding sleeve, and the sliding ball is slidably arranged inside the arc groove.

[0012] According to a preferred technical solution, the top of the prefabricated bin is made of iron, a handle is provided on the outer end of the operating control arm, and a magnet block is provided on the upper side of the outer end of the operating control arm.

[0013] A preferred technical solution is that a bending frame is fixedly provided on the top upper side of the prefabricated bin, a stopper is fixedly provided on the upper cover and on the outer side of the hinge with the sliding sleeve, the upper end of the bending frame is located above the stopper, and the magnet block is threadedly connected to the upper side of the outer end of the operating control arm through a screw.

[0014] A method for installing a pre-installed GIL power transmission device, characterized in that it comprises the following steps:

[0015] (1) Fix at least one of the bushing inlet and outlet modules or the cable terminal inlet and outlet modules according to the designed position;

[0016] (2) docking the standard module with at least one of the above modules, using a crane to lift the module to the installation location;

[0017] (3) Connect the end of the three-phase GIL of the standard module with the end of the three-phase GIL of the bushing inlet and outlet module or the cable terminal inlet and outlet module, and then fix the prefabricated warehouse on the ground;

[0018] (4) Select the number of standard modules to be connected according to the length of the transmission line;

[0019] (5) After the remaining modules are docked, the overhead line is connected to the three-phase transmission conductor of the bushing inlet and outlet module through the air composite bushing;

[0020] (6) After the connection is completed, debug the entire circuit and check the auxiliary equipment in each module. After the inspection passes, power on and operation can be carried out.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. It greatly saves the installation workload at the project site. 90% of the on-site installation work can be completed in the factory in advance, saving on-site installation time.

[0023] 2. The requirements for on-site civil engineering work are reduced. There is no need to dig tunnels and trenches on site. All that is needed is to simply level the ground.

[0024] 3. The degree of engineering standardization is improved, and all modules use a unified interface, which avoids the workload of docking between different interfaces, facilitates maintenance and operation, and customized modules can maximize the efficiency of on-site maintenance and replacement.

[0025] 3. The ventilation and air permeability are good, and the mechanical ventilation device is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the present invention after the front side is cut open;

[0028] Figure 3 This is a schematic diagram of the outer structure of the mechanical ventilation device of the present invention cooperating with the top of the prefabricated warehouse;

[0029] Figure 4 This is a schematic diagram of the inner structure of the mechanical ventilation device of the present invention cooperating with the top of the prefabricated warehouse;

[0030] Figure 5 It is a schematic diagram of the structure of the mechanical ventilation device of the present invention after the upper cover is separated;

[0031] Figure 6 It is a schematic diagram of the structure of the mechanical ventilation device of the present invention after it is opened and the upper cover is removed;

[0032] Figure 7 This is a schematic diagram of the structure of the control arm of the present invention;

[0033] In the figure: 1. Bushing inlet and outlet module; 2. Standard module; 3. Cable terminal inlet and outlet module; 4. Overhead line; 5. Air composite bushing; 10. Prefabricated warehouse; 11. Three-phase GIL; 12. Mechanical ventilation device; 13. Bending frame; 121. Fixed sleeve; 122. Sliding sleeve; 123. Upper cover; 124. Fixed frame; 125. Rotating frame; 126. Rotating arm; 127. Handle; 128. Magnet block; 129. Screw; 1221. Arc groove; 1261. Rotating sleeve; 1262. Lifting control arm; 1263. Manipulating control arm; 1264. Sliding ball; 1231. Stopper. DETAILED DESCRIPTION

[0034] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] like Figure 1 As shown, a pre-installed GIL power transmission device includes a bushing inlet and outlet module 1, a standard module 2 and a cable terminal inlet and outlet module 3, wherein the standard module 2 is fixedly arranged between the bushing inlet and outlet module 1 and the cable terminal inlet and outlet module 3, and the bushing inlet and outlet module 1, the standard module 2 and the cable terminal inlet and outlet module 3 all include a prefabricated warehouse 10, wherein three-phase GILs 11 are fixedly arranged inside the prefabricated warehouse 10, respectively, and the three-phase GILs 11 of the bushing inlet and outlet module 1, the standard module 2 and the cable terminal inlet and outlet module 3 are connected end to end in sequence, and three-phase power transmission conductors are fixedly arranged inside the three-phase GILs 11. Doors and windows 14 are arranged on the front side of the prefabricated warehouse 10.

[0037] like Figure 1 and Figure 2As shown, the three-phase GIL11 is arranged horizontally, and the middle part of the assembled three-phase GIL11 is arranged in three layers, upper, middle and lower. The two ends of the three-phase GIL11 are respectively distributed in a stepped shape, and the distance between the three-phase GIL11 in the horizontal direction is equal and greater than 1 meter. The two ends of the assembled three-phase GIL11 are vertical, and the distance between the three-phase GIL11 in the vertical direction is equal. At least one of the two three-phase GIL11 ends connected end to end extends to the outside of the prefabricated warehouse 10, and the other end is recessed into the inside of the prefabricated warehouse 10. The length of the three-phase GIL11 extending to the outside of the prefabricated warehouse 10 is 0.5 to 2 meters, and the end of the three-phase GIL11 extending to the outside of the prefabricated warehouse 10 is provided with a unified interface. The three-phase GIL extending from the end of the cable terminal inlet and outlet module is connected to the high-voltage cable terminal head. In the inner corner of the prefabricated warehouse 10 of the cable terminal inlet and outlet module 3, an LCP control cabinet 6 is arranged, which can be used to install various electrical monitoring devices such as gas, temperature, partial discharge, and displacement. The four corners of the upper part of the prefabricated warehouse 10 are provided with detachable lifting rings 7 to facilitate the lifting and installation of the prefabricated warehouse. At the four corners of the bottom of the prefabricated warehouse 10, there are bolt holes for fixing the modules. A mounting bracket 8 is provided on the wall on one side where the GIL pipeline is installed inside the prefabricated warehouse 10. The mounting brackets 8 are arranged at equal distances and can be adjusted up, down, left and right. The interior of the prefabricated warehouse 10 is divided into two areas, one side is the transmission line installation area, and the other side is the installation and inspection channel 9, where the inspection channel 9 is 0.5~1 meter wide. Lighting and communication facilities are arranged on the upper part of the inspection channel 9, and fire-fighting facilities are arranged on the lower part of the inspection channel 9. The prefabricated warehouse 10 is a square structure, in which the upper two sides are angled slopes with an inclination angle of 10~30°.

[0038] like Figure 1-Figure 7As shown, a mechanical ventilation device 12 is provided at the middle position of the top of the prefabricated warehouse 10, and the mechanical ventilation device 12 includes a fixed sleeve 121, a sliding sleeve 122, an upper cover 123, a fixed frame 124, a rotating frame 125 and a rotating arm 126. The bottom of the fixed sleeve 121 is fixedly arranged on the upper part of the prefabricated warehouse 10 and the interior of the fixed sleeve 121 is communicated with the interior of the prefabricated warehouse 10. The sliding sleeve 122 is slidably arranged on the outer side of the fixed sleeve 121 up and down, the upper cover 123 is arranged at the upper end of the sliding sleeve 122, and the lower side of the upper cover 123 is hinged to the upper side of the sliding sleeve 122. The fixed frame 124 is fixedly arranged At the upper part of the fixed sleeve 121, the rotating frame 125 is rotatably arranged at the middle position of the fixed frame 124, and the rotating arm 126 is rotatably arranged on the rotating frame 125; the rotating arm 126 includes a rotating sleeve 1261 rotatably connected to the rotating frame 125, a lifting control arm 1262 is fixedly arranged on one side of the rotating sleeve 1261, and a manipulation control arm 1263 is fixedly arranged on the other side of the rotating sleeve 1261, a sliding ball 1264 is fixedly arranged on the outer end side of the lifting control arm 1262, and an arc groove 1221 is arranged on the inner side of the sliding sleeve 122, and the sliding ball 1264 is slidably arranged inside the arc groove 1221. The top of the prefabricated warehouse 10 is made of iron material, and a handle 127 is arranged on the outer end side of the manipulation control arm 1263, and a magnet block 128 is arranged on the upper side of the outer end of the manipulation control arm 1263.

[0039] like Figure 3 and Figure 5 As shown, a bending frame 13 is fixedly provided on the top upper side of the prefabricated warehouse 10, a stopper 1231 is fixedly provided on the upper cover 123 and on the outer side of the hinge with the sliding sleeve 122, the upper end of the bending frame 13 is located above the stopper 1231, and the magnet block 128 is threadedly connected to the upper side of the outer end of the operating control arm 1263 through a screw 129.

[0040] The present invention adopts a mechanical ventilation device, and the opening and closing of the mechanical ventilation device can be conveniently controlled inside the prefabricated warehouse 10, and the degree of opening can be controlled. The specific operation method is as follows:

[0041] like Figure 3 and Figure 4As shown, the mechanical ventilation device 12 is in a closed state, at which time the sliding sleeve 122 is sleeved on the outside of the fixed sleeve 121, the upper cover 123 completely covers the upper side of the sliding sleeve 122, the operating control arm 1263 is located in the middle of the top of the prefabricated bin 10 and is parallel to the longitudinal direction of the top of the prefabricated bin 10, and the sliding ball 1264 is located at one end of the arc groove 1221. When the sliding sleeve 122 and the upper cover 123 are covered on the upper part of the fixed sleeve 121 due to their own gravity, the mechanical ventilation device 12 is closed, and a magnet block 128 is fixedly provided on the outer end side of the operating control arm 1263. The magnet block 128 does not contact the middle of the top of the prefabricated bin 10 at this time, and the magnet block 128 is not in contact with the middle of the top of the prefabricated bin 10. 28 has a certain suction force on the prefabricated bin 10, which is also conducive to the closing of the mechanical ventilation device 12, and because the operating control arm 1263 can be set longer, the force arm of the magnet block 128 on the top of the prefabricated bin 10 is much larger than the force arm of the sliding sleeve 122 and the upper cover 123's own weight. Therefore, the mechanical ventilation device 12 can be easily operated and opened from the outer end side of the operating control arm 1263 (inside the prefabricated bin), while the sliding sleeve 122 and the upper cover from the outside have a smaller force arm, so it takes a larger force to open them. In this way, the sliding sleeve 122 and the upper cover 123 can be made very light, and can also play a role in preventing strong winds and heavy rains.

[0042] When the mechanical ventilation device 12 needs to be opened, the control arm 1263 only needs to be pressed down by the handle 127, and the outer end side of the lifting control arm 1262 will be lifted. Due to the cooperation between the sliding ball 1264 and the arc groove 1221, the lifting control arm 1262 will drive the sliding sleeve 122 and the upper cover 123 to be lifted, so that the sliding sleeve 122 is separated from the fixed sleeve 121 and is located above the fixed sleeve 121 (such as Figure 6As shown), at this time, a ventilation gap is leaked between the bottom of the sliding sleeve 122 and the fixed sleeve 121, thereby playing a role in ventilation and heat dissipation. After pressing down the operating control arm 1263 and rotating it 90 degrees, the sliding ball 1264 will move from the starting end to the other end of the arc groove 1221. At this time, the operating control arm 1263 also changes from being parallel to the longitudinal direction of the top of the prefabricated warehouse 10 to being perpendicular to the longitudinal direction of the top of the prefabricated warehouse 10. Since the two sides of the top of the prefabricated warehouse 10 are tilted downward, the magnet block 128 on the operating control arm 1263 will be adsorbed on one side of the top of the prefabricated warehouse 10, thereby playing the role of opening and fixing the mechanical ventilation device 12. The degree to which the mechanical ventilation device 12 is opened depends on the degree to which the operating control arm 1263 is pressed downward (the sliding ball 1264 will not deviate from the limit range of the arc groove 1221), and also depends on the distance between the magnet block 128 and the operating control arm 1263. In this way, we can use the screw 129 to adjust the distance between the magnet block 128 and the operating control arm 1263, thereby controlling the degree to which the operating control arm 1263 is pressed downward, and then controlling the degree to which the mechanical ventilation device 12 is opened. In addition, when we adjust the distance between the iron block 128 and the operating control arm 1263, when the upper cover 123 rises to a certain extent, the stopper 1231 will touch the bending frame 13, so that the upper cover 123 will flip open at the hinge, that is, through the setting of the magnet block 128, the opening of the upper cover 123 can be controlled, which is conducive to opening the upper cover 123 when the weather is clear, thereby increasing the ventilation volume, or accelerating the ventilation and drying in the prefabricated warehouse after rain.

[0043] A method for installing a pre-installed GIL power transmission device comprises the following steps:

[0044] (1) Fix at least one of the bushing inlet and outlet modules 1 or the cable terminal inlet and outlet modules 3 according to the designed position;

[0045] (2) docking the standard module 2 with at least one of the above modules. During docking, a crane is used to lift the module to the installation position;

[0046] (3) The end of the three-phase GIL11 of the standard module 2 is docked with the end of the three-phase GIL11 of the bushing inlet and outlet module 1 or the cable terminal inlet and outlet module 3, and the prefabricated bin 10 is fixed on the ground after docking; the docking is carried out with standard bolts, and after docking for a section, the prefabricated bin is fixed with the embedded iron block through the fixing block at the bottom;

[0047] (4) Select the number of standard modules 2 that need to be connected according to the length of the transmission line;

[0048] (5) After the remaining modules are docked, the cable head of the overhead line 4 is connected to the three-phase transmission conductor of the bushing inlet and outlet module 1 through the air composite bushing 5;

[0049] (6) After the connection is completed, debug the entire circuit and check the auxiliary equipment in each module. After the inspection passes, power on and operation can be carried out.

[0050] The implementation steps of the pre-installed GIL are as follows:

[0051] Step 1: Process and debug all modules in the factory;

[0052] Step 2: Harden the ground at the construction site and arrange the foundation iron blocks at the predetermined locations.

[0053] Step 3: After each module is transported to the site, it is hoisted and installed.

[0054] Step 4: Connect the bushing inlet and outlet modules and the cable terminal inlet and outlet modules to the incoming or outgoing end of the transmission line respectively, and perform debugging after the connection is completed.

[0055] Step 5: After debugging, check the auxiliary equipment in each module. If everything is normal, power can be transmitted.

[0056] The preferred implementation modes of the present application are described in detail above, but the present application is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present application.

Claims

1. A pre-installed GIL power transmission device, characterized in that: The invention comprises a bushing inlet and outlet module (1), a standard module (2) and a cable terminal inlet and outlet module (3); the standard module (2) is fixedly arranged between the bushing inlet and outlet module (1) and the cable terminal inlet and outlet module (3); the bushing inlet and outlet module (1), the standard module (2) and the cable terminal inlet and outlet module (3) all comprise a prefabricated bin (10); three-phase GILs (11) are fixedly arranged inside the prefabricated bin (10); the three-phase GILs (11) of the bushing inlet and outlet module (1), the standard module (2) and the cable terminal inlet and outlet module (3) are connected end to end in sequence; three-phase transmission conductors are fixedly arranged inside the three-phase GILs (11).

2. A pre-installed GIL power transmission device according to claim 1, characterized in that: The three-phase GIL (11) is arranged horizontally, and the middle part of the assembled three-phase GIL (11) is arranged in three layers of upper, middle and lower layers, and the two ends of the three-phase GIL (11) are respectively arranged in a stepped shape, and the distances between the three-phase GILs (11) in the horizontal direction are equal and greater than 1 meter.

3. A pre-installed GIL power transmission device according to claim 2, characterized in that: The two ends of the assembled three-phase GIL (11) are vertical, and the distances between the three-phase GIL (11) in the vertical direction are equal.

4. The pre-installed GIL power transmission device according to claim 1, characterized in that: At least one of the ends of two three-phase GILs (11) connected end to end extends to the outside of the prefabricated bin (10), and the other end is recessed into the inside of the prefabricated bin (10); the length of the three-phase GIL (11) extending to the outside of the prefabricated bin (10) is 0.5 to 2 meters; and a unified interface is provided at the end of the three-phase GIL (11) extending to the outside of the prefabricated bin (10).

5. A pre-installed GIL power transmission device according to claim 4, characterized in that: The three-phase GIL extending from the end of the cable terminal inlet and outlet module is connected to the high-voltage cable terminal head.

6. The pre-assembled GIL power transmission device according to claim 1, characterized in that: The prefabricated warehouse (10) is a square structure, wherein both sides of the upper part are angled slopes with an inclination angle of 10 to 30 degrees.

7. A pre-assembled GIL power transmission device according to claim 6, characterized in that: A mechanical ventilation device (12) is arranged at the middle position of the top of the prefabricated bin (10), and the mechanical ventilation device (12) comprises a fixed sleeve (121), a sliding sleeve (122), an upper cover (123), a fixed frame (124), a rotating frame (125) and a rotating arm (126); the bottom of the fixed sleeve (121) is fixedly arranged on the upper part of the prefabricated bin (10), and the interior of the fixed sleeve (121) is communicated with the interior of the prefabricated bin (10); the sliding sleeve (122) is arranged to slide up and down on the outside of the fixed sleeve (121); the upper cover (123) is arranged at the upper end of the sliding sleeve (122), and the lower side of the upper cover (123) is hinged to the upper side of the sliding sleeve (122); the fixed frame (124) is fixedly arranged on the upper part of the sliding sleeve (122); The rotating frame (125) is rotatably arranged at the middle position of the fixed frame (124) on the upper part of the fixed sleeve (121), and the rotating arm (126) is rotatably arranged on the rotating frame (125); the rotating arm (126) comprises a rotating sleeve (1261) rotatably connected to the rotating frame (125); a lifting control arm (1262) is fixedly arranged on one side of the rotating sleeve (1261), and a manipulation control arm (1263) is fixedly arranged on the other side of the rotating sleeve (1261); a sliding ball (1264) is fixedly arranged on the outer end side of the lifting control arm (1262); an arc groove (1221) is arranged on the inner side surface of the sliding sleeve (122), and the sliding ball (1264) is slidably arranged inside the arc groove (1221).

8. The pre-assembled GIL power transmission device according to claim 7, characterized in that: The top of the prefabricated bin (10) is made of iron, a handle (127) is provided on the outer end side of the operating control arm (1263), and a magnet block (128) is provided on the upper side of the outer end of the operating control arm (1263).

9. A pre-installed GIL power transmission device according to claim 8, characterized in that: A bending frame (13) is fixedly provided on the top upper side of the prefabricated bin (10), a stopper (1231) is fixedly provided on the outer side of the upper cover (123) and located at the hinged part with the sliding sleeve (122), the upper end of the bending frame (13) is located above the stopper (1231), and the magnet block (128) is threadedly connected to the upper side of the outer end of the operating control arm (1263) via a screw rod (129).

10. A method for installing a pre-installed GIL power transmission device according to any one of claims 1 to 9, characterized in that: The following steps are included: (1) Fixing at least one of the bushing inlet and outlet modules (1) or the cable terminal inlet and outlet modules (3) according to the designed position; (2) docking the standard module (2) with at least one of the above modules, using a crane to lift the module to the installation position; (3) docking the end of the three-phase GIL (11) of the standard module (2) with the end of the three-phase GIL (11) of the bushing inlet and outlet module (1) or the cable terminal inlet and outlet module (3), and after docking, fixing the prefabricated bin (10) on the ground; (4) Select the number of standard modules (2) to be connected according to the length of the transmission line; (5) After the remaining modules are connected, the overhead line is connected to the three-phase transmission conductor of the bushing inlet and outlet module (1) through the air composite bushing; (6) After the connection is completed, debug the entire circuit and check the auxiliary equipment in each module. After the inspection passes, power on and operation can be carried out.

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