A rapid replacement device for generator circuit breaker faults and its installation method

Abstract

A fast replacement device for generator circuit breaker faults and its installation method, including a replacement unit. The replacement unit includes a left inner conductor and a right inner conductor. One end of the left inner conductor and the right inner conductor facing each other is connected and conducts electricity through a first busbar. The other end of the left inner conductor is used for electrical connection with the left phase-separated busbar, and the other end of the right inner conductor is used for electrical connection with the right phase-separated busbar. An outer housing is arranged outside the left inner conductor and the right inner conductor, and the inside of the outer housing is connected and supported to the left inner conductor and the right inner conductor respectively through a plurality of insulators. The entire replacement unit is used to temporarily replace the faulty circuit breaker after a generator circuit breaker fault, enabling the generator set to be quickly put into operation and effectively reducing the loss of outage due to faults.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower station maintenance, and particularly to a device for quickly replacing a generator circuit breaker failure. Background Art

[0002] For the large-scale generating units in service in China, the vast majority of the generator circuit breakers (GCBs) used are foreign brands. Once an emergency occurs, due to the long distance from the original manufacturer, when the equipment fails, it is impossible to obtain the original spare parts and technical support in time, which will lead to the shutdown of the generating unit and the safety of power consumption cannot be guaranteed. Even for domestic manufacturers, due to the inability to provide spare parts in time and the long maintenance time, it will also lead to a certain shutdown time, thus resulting in the problem of shutdown losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above background art, and provide a device for quickly replacing a generator circuit breaker failure and its installation method, realizing the temporary replacement of the faulty circuit breaker, enabling the generating unit to be quickly put into operation, and effectively reducing the failure shutdown losses.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a device for quickly replacing a generator circuit breaker failure, including a replacement unit. The replacement unit includes a left inner conductor and a right inner conductor. One end of the left inner conductor and the right inner conductor facing each other is connected and conducts electricity through a first busbar. The other end of the left inner conductor is used for electrically connecting with the left phase-separated busbar, and the other end of the right inner conductor is used for electrically connecting with the right phase-separated busbar. An outer housing is arranged outside the left inner conductor and the right inner conductor, and the inside of the outer housing is connected and supported with the left inner conductor and the right inner conductor respectively through a plurality of insulators;

[0005] The left inner conductor includes a left conductive box body. The two opposite end faces of the left conductive box body are respectively provided with a protruding first conductive ring and a second conductive ring. The right inner conductor includes a right conductive box body. The two opposite end faces of the right conductive box body are respectively provided with a protruding third conductive ring and a fourth conductive ring. The second conductive ring and the fourth conductive ring are connected and conduct electricity through a plurality of first busbars. In the use state, the first conductive ring is electrically connected with the left phase-separated busbar through a plurality of second busbars, and the third conductive ring is electrically connected with the right phase-separated busbar through a plurality of third busbars;

[0006] The outer housing includes a left outer cylinder and a right outer cylinder. The left inner conductor is installed in the left outer cylinder through a plurality of insulators, and the right inner conductor is installed in the right outer cylinder through a plurality of insulators. The left outer cylinder and the right outer cylinder are connected to each other through a corrugated sleeve. In the use state, the left outer cylinder is connected and closed with the outer shell of the left phase-separated busbar through a left cover, and the right outer cylinder is connected and closed with the outer shell of the right phase-separated busbar through a right cover;

[0007] A protective cover is also installed on the outer walls of the opposite ends of the left outer cylinder and the right outer cylinder, and the corrugated sleeve is located inside the protective cover;

[0008] The protective cover includes connecting rings respectively installed on the left outer cylinder and the right outer cylinder, and a telescopic ring is sleeved outside the connecting rings on both sides; the telescopic ring can be sleeved on the left outer cylinder and can move from the left outer cylinder and be installed on the connecting rings on both sides;

[0009] An installation seat is arranged at the bottom of the outer shell.

[0010] The second conductive bar and the third conductive bar are flexible conductive bars.

[0011] The bolt holes for connecting the first conductive bar with the second conductive ring and the fourth conductive ring are oblong holes.

[0012] An observation window is arranged on the outer shell.

[0013] An installation method for a generator circuit breaker fault quick replacement device, used for the installation of the described generator circuit breaker fault quick replacement device, the installation method includes the following steps:

[0014] S1. After the generator circuit breaker fails, remove the faulty generator circuit breaker;

[0015] S2. Sleeve the left cover on the outer shell of the left phase-separated bus, then lift and transport the combination of the left inner conductor and the left outer cylinder to the foundation support frame at the installation position, and install and connect the installation seat below the left outer cylinder to the foundation support frame through bolts;

[0016] S3. Install multiple second conductive bars around the left phase-separated bus and the first conductive ring through bolts;

[0017] S4. Move the left cover to the connection with the left outer cylinder to the right, and install the annular left cover on the outer shell of the left phase-separated bus and the left outer cylinder through bolts to seal the gap between the outer shell of the left phase-separated bus and the left outer cylinder;

[0018] S5. Sleeve the telescopic ring on the left outer cylinder for standby;

[0019] S6. Sleeve the right cover on the outer shell of the right phase-separated bus, then lift and transport the combination of the right inner conductor and the right outer cylinder to the foundation support frame at the installation position, and install and connect the installation seat below the right outer cylinder to the foundation support frame through bolts;

[0020] S7. Install multiple third conductive bars around the third conductive ring and the right phase-separated bus through bolts;

[0021] S8. Move the right housing to the left to the connection with the right outer cylinder, and install the annular right housing on the outer shell of the right phase-separated bus and the right outer cylinder through bolts to close the gap between the outer shell of the right phase-separated bus and the right outer cylinder;

[0022] S9. Slip the corrugated bushing over the left outer cylinder or the right outer cylinder, and the corrugated bushing is located at one end close to the connecting ring;

[0023] S10. Install both ends of multiple first conductive bars on the second conductive ring and the fourth conductive ring through bolts;

[0024] S11. Then pull the corrugated bushing apart so that both ends of the corrugated bushing are respectively located on the left outer cylinder and the right outer cylinder, and connect and fix both ends of the corrugated bushing to the left outer cylinder and the right outer cylinder through clamps;

[0025] S12. Move the expansion ring, slip the expansion ring over the connecting ring, and fix both ends of the expansion ring on the connecting rings on both sides through bolts, thus completing the segmented assembly and enclosure of the entire replacement device.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention provides an installation and replacement station for installing a circuit breaker and for installing a replacement unit when the circuit breaker fails, between the left phase-separated bus and the right phase-separated bus. When the circuit breaker fails, the faulty circuit breaker can be directly removed, and the replacement unit can be directly installed at the installation and replacement station, realizing the replacement of the faulty equipment (GCB), so that the unit can be quickly put into operation, effectively reducing the fault loss. More importantly, due to the large size of the unit equipment and the very narrow replacement space, it is very difficult to quickly install and position a monolithic replacement unit. Therefore, by cleverly setting the replacement unit to consist of two replacement segments on the left and right, and electrically connecting the two replacement segments on the left and right and connecting them to each other through a corrugated bushing, effective adjustment can be made during the installation process, thereby achieving the purpose of quickly replacing the faulty circuit breaker within a limited time. When a major fault occurs in the GCB of the generator set and it cannot be repaired in a short time due to various reasons, the unit can be quickly and efficiently put into operation, thus reducing the problem of outage loss caused by GCB faults and effectively reducing the production operation cost.

[0028] 2. The left inner conductor and the right inner conductor of the present invention are used to be electrically connected to the left separated-phase busbar and the right separated-phase busbar at both ends respectively. The first conductive bar is used to electrically connect the left inner conductor and the right inner conductor, and adjust the total length of the left inner conductor and the right inner conductor, and adjust the installation distance from the left separated-phase busbar and the right separated-phase busbar. The outer sides of the left inner conductor and the right inner conductor are provided with a housing through a plurality of insulators. The insulators insulate the left inner conductor and the right inner conductor from the housing, and the housing isolates and protects the left inner conductor and the right inner conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the drawings and embodiments.

[0030] Figure 1 It is a perspective view of the structure of the present invention.

[0031] Figure 2 It is a schematic side view structure diagram of the present invention.

[0032] Figure 3 is Figure 1 The schematic cross-sectional structure diagram of A-A in

[0033] Figure 4 It is a schematic structure diagram when the present invention is installed.

[0034] In the figure: left separated-phase busbar 1, right separated-phase busbar 2, replacement unit 3, left inner conductor 4, left conductive box body 41, first conductive ring 42, second conductive ring 43, right inner conductor 5, right conductive box body 51, third conductive ring 52, fourth conductive ring 53, second conductive bar 6, third conductive bar 7, housing 8, left outer cylinder 81, right outer cylinder 82, corrugated sleeve 83, left cover 84, right cover 85, connecting ring 86, telescopic ring 87, mounting seat 88, observation window 89, first conductive bar 9, insulator 10, foundation support frame 20. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Embodiment 1:

[0036] See Figures 1-4, A fast replacement device for generator circuit breaker faults, including a replacement unit 3. The replacement unit 3 includes a left inner conductor 4 and a right inner conductor 5. One end of the left inner conductor 4 and the right inner conductor 5 facing each other is connected and conducts electricity through a first busbar 9. The other end of the left inner conductor 4 is used to be electrically connected to the left phase-separated busbar 1, and the other end of the right inner conductor 5 is used to be electrically connected to the right phase-separated busbar 2. An outer housing 8 is arranged outside the left inner conductor 4 and the right inner conductor 5. Inside the outer housing 8, the left inner conductor 4 and the right inner conductor 5 are respectively connected and supported through a plurality of insulators 10. The left inner conductor 4 and the right inner conductor 5 are used to be respectively electrically connected to the left phase-separated busbar 1 and the right phase-separated busbar 2 at both ends. The first busbar 9 is used to electrically connect the left inner conductor 4 and the right inner conductor 5 and adjust the total length of the left inner conductor 4 and the right inner conductor 5, and adjust the installation spacing from the left phase-separated busbar 1 and the right phase-separated busbar 2. The outer housing 8 is installed outside the left inner conductor 4 and the right inner conductor 5 through a plurality of insulators 10. The insulators 10 insulate the left inner conductor 4 and the right inner conductor 5 from the outer housing 8, and the outer housing 8 isolates and protects the left inner conductor 4 and the right inner conductor 5. The entire replacement unit 3 is used to temporarily replace the faulty circuit breaker after a generator circuit breaker fault, enabling the generator set to be quickly put into operation and effectively reducing the loss of outage due to faults.

[0037] See Figure 2 , Specifically, inverted T-shaped support seats are respectively arranged on the lower sides of the left inner conductor 4 and the right inner conductor 5. Fixed seats are arranged inside the outer housing 8 at positions corresponding to the support seats. The insulators 10 are installed on the fixed seats through bolts, and the support seats are installed on the insulators 10 through bolts. To ensure stability, two insulators 10 are installed below each support seat. Of course, a plurality of support seats, such as three, can also be evenly arranged in a ring on the outer walls of the left inner conductor 4 and the right inner conductor 5, and a plurality of fixed seats are also evenly arranged in a ring correspondingly inside the outer housing 8. In this way, a more stable support effect is achieved.

[0038] Specifically, see Figure 1 , The left inner conductor 4 includes a left conductive box body 41. Two opposite end faces of the left conductive box body 41 are respectively provided with protruding first conductive rings 42 and second conductive rings 43. The right inner conductor 5 includes a right conductive box body 51. Two opposite end faces of the right conductive box body 51 are respectively provided with protruding third conductive rings 52 and fourth conductive rings 53. The second conductive ring 43 and the fourth conductive ring 53 are bolt-connected and conduct electricity through a plurality of first busbars 9. In the use state, the first conductive ring 42 is bolt-connected and conducts electricity to the left phase-separated busbar 1 through a plurality of second busbars 6, and the third conductive ring 52 is bolt-connected and conducts electricity to the right phase-separated busbar 2 through a plurality of third busbars 7. Through the above structure, the electrical connection between the left inner conductor 4 and the right inner conductor 5, and the electrical connection between the left inner conductor 4 and the left phase-separated busbar 1, and between the right inner conductor 5 and the right phase-separated busbar 2 are realized.

[0039] Further, referring to Figure 1 , the second conductive bar 6 and the third conductive bar 7 are flexible conductive bars. The flexible conductive bar is composed of multiple layers of thin copper plates combined, with a protrusion in the middle. When the length of the replacement unit 3 changes due to thermal expansion and contraction, the flexible conductive bar can adapt to the length deformation of the replacement unit 3.

[0040] In order to facilitate fine adjustment of the total length of the replacement unit 3, the bolt holes for connecting the first conductive bar 9 with the second conductive ring 43 and the fourth conductive ring 53 are long holes. During installation, the screw passes through the long hole and is connected to the second conductive ring 43 or the fourth conductive ring 53.

[0041] Referring to Figure 1 , the outer casing 8 includes a left outer cylinder 81 and a right outer cylinder 82. The left inner conductor 4 is installed in the left outer cylinder 81 through a plurality of insulators 10, and the right inner conductor 5 is installed in the right outer cylinder 82 through a plurality of insulators 10. The left outer cylinder 81 and the right outer cylinder 82 are connected to each other through a corrugated sleeve 83. In the use state, the left outer cylinder 81 is bolted and closed with the outer casing of the left phase-separated bus 1 through a left cover 84, and the right outer cylinder 82 is bolted and closed with the outer casing of the right phase-separated bus 2 through a right cover 85. Since the on-site space is relatively compact, making the replacement unit 3 as a whole is not convenient for hoisting and installation. Through the segmented connection structure, the left inner conductor 4 and the left outer cylinder 81 form a replacement segment, and the right inner conductor 5 and the right outer cylinder 82 form a replacement segment, so that installation can be carried out in segments, and the length of each hoisting is greatly shortened.

[0042] Specifically, the corrugated sleeve 83 is a rubber corrugated pipe. Both ends of the corrugated sleeve 83 are sleeved on the left outer cylinder 81 and the right outer cylinder 82, and are installed and fixed through an annular hoop.

[0043] Further, in order to protect the corrugated sleeve 83 and enable the left outer cylinder 81 and the right outer cylinder 82 to be rigidly connected, protective covers are also installed on the outer walls of the opposite ends of the left outer cylinder 81 and the right outer cylinder 82, and the corrugated sleeve 83 is located inside the protective covers.

[0044] Specifically, referring to Figure 1 , the protective cover includes connection rings 86 respectively installed on the left outer cylinder 81 and the right outer cylinder 82, and telescopic rings 87 are sleeved outside the connection rings 86 on both sides. The cross-section of the connection ring 86 is L-shaped, and one end is welded and fixed to the left outer cylinder 81 or the right outer cylinder 82, and the telescopic ring 87 is installed on the annular surface of the connection ring 86 through bolts.

[0045] Preferably, the telescopic ring 87 is an annular expansion joint with corrugations.

[0046] Referring toFigure 1 , 2 , a mounting seat 88 is provided at the bottom of the outer housing 8, facilitating the installation of the replacement unit 3 onto the basic support frame 20.

[0047] Refer to Figure 1 , an observation window 89 is provided on the outer housing 8, facilitating the observation of the internal situation. Specifically, the observation window 89 adopts a flange observation window, and the installation and structure of the flange observation window are prior arts, which will not be elaborated here.

[0048] In addition, in order to make the contact surfaces of the second conductive bar 6 and the third conductive bar 7 larger and more stable after installation, refer to Figure 3 , the first conductive ring 42 and the third conductive ring 52 adopt an annular structure formed by enclosing with a plurality of rectangular connecting plates, and the second conductive bar 6 and the third conductive bar 7 are respectively connected to each connecting plate. The second conductive ring 43 and the fourth conductive ring 53 can adopt an annular structure formed by enclosing with a plurality of rectangular connecting plates, or can be a polygonal structure formed by a plurality of rectangular plates.

[0049] Embodiment 2:

[0050] Refer to Figure 1 , 4 After the generator circuit breaker (GCB) fails, the faulty generator circuit breaker is removed.

[0051] First, the left housing 84 is sleeved on the outer housing of the left phase-separated bus 1, then the combination of the left inner conductor 4 and the left outer cylinder 81 is hoisted to the basic support frame 20 at the installation position, and the mounting seat 88 below the left outer cylinder 81 is installed and connected to the basic support frame 20 through bolts. Then, a plurality of second conductive bars 6 are installed around the left phase-separated bus 1 and the first conductive ring 42 through bolts. Then, the left housing 84 is moved to the right to the connection with the left outer cylinder 81, and the annular left housing 84 is installed on the left phase-separated bus 1 and the left outer cylinder 81 through bolts. Then, the expansion ring 87 is sleeved on the left outer cylinder 81.

[0052] Then, the right housing 85 is sleeved on the outer housing of the right phase-separated bus 2, and the combination of the right inner conductor 5 and the right outer cylinder 82 is hoisted to the basic support frame 20 at the installation position. The mounting seat 88 below the right outer cylinder 82 is installed and connected to the basic support frame 20 through bolts. Then, a plurality of third conductive bars 7 are installed around the third conductive ring 52 and the right phase-separated bus 2 through bolts. Then, the right housing 85 is moved to the left to the connection with the right outer cylinder 82, and the annular right housing 85 is installed on the outer housing of the right phase-separated bus 2 and the right outer cylinder 82 through bolts.

[0053] Afterwards, slip the corrugated sleeve 83 over one end of the left outer cylinder 81 or the right outer cylinder 82 that is located at the connecting ring 86. Install both ends of multiple first conductive bars 9 onto the second conductive ring 43 and the fourth conductive ring 53 through bolts. Then pull the corrugated sleeve 83 apart so that both ends of the corrugated sleeve 83 are respectively located on the left outer cylinder 81 and the right outer cylinder 82, and connect and fix both ends of the corrugated sleeve 83 to the left outer cylinder 81 and the right outer cylinder 82 respectively through hoop clamps.

[0054] Afterwards, move the telescopic ring 87, slip the telescopic ring 87 over the connecting ring 86, and fix both ends of the telescopic ring 87 to the connecting rings 86 on both sides through bolts.

[0055] Thus, the segmented assembly and enclosure of the entire replacement device are completed.

[0056] During manufacturing, according to the shape interface dimensions of the generator circuit breaker (GCB), the replacement unit 3 is pre-produced in the factory. Among them, the replacement segments of the replacement unit in the present invention are made in two parts (left replacement segment and right replacement segment), and the shape and opening dimensions of the connection terminals at the ends are strictly consistent with the connection terminals of the GCB, so that the flexible connections used for connecting the GCB can be completely reused. The two conductive connection parts between the left replacement segment and the right replacement segment are connected by conductive bar bolts, which is convenient for on-site installation and adjustment. The supports of the left replacement segment and the right replacement segment make full use of the support steel frame of the GCB, which is beneficial to saving the cost of replacement and transformation.

[0057] During use, once a major fault occurs in the generator circuit breaker (GCB) and cannot be repaired in the short term due to various reasons, the generator circuit breaker (GCB) can be promptly removed and the replacement unit can be installed according to the drawing, and the unit can run again.

[0058] From the above description, it can be seen that in order to save costs and time, the original isolated-phase bus, flexible connection, and the basic steel frame of the GCB are retained. Once the GCB is repaired, the replacement unit can be conveniently removed and the GCB can be connected to the generator circuit again, thus effectively reducing the impact on power safety caused by a major fault in the GCB and the inability to be repaired in the short term due to external environmental influences.

Claims

1. A generator circuit breaker fault rapid replacement device, characterized in that: The replacement unit (3) comprises a left inner conductor (4) and a right inner conductor (5), wherein opposite ends of the left inner conductor (4) and the right inner conductor (5) are connected for electrical conduction via a first conductive bar (9), the other end of the left inner conductor (4) is used for electrical connection to a left isolated phase busbar (1), and the other end of the right inner conductor (5) is used for electrical connection to a right isolated phase busbar (2), an outer shell (8) is provided outside the left inner conductor (4) and the right inner conductor (5), and a plurality of insulators (10) are provided inside the outer shell (8) for connection and support to the left inner conductor (4) and the right inner conductor (5) respectively; The left inner conductor (4) comprises a left conductive box (41), and two opposite end surfaces of the left conductive box (41) are respectively provided with a protruding first conductive ring (42) and a second conductive ring (43); the right inner conductor (5) comprises a right conductive box (51), and two opposite end surfaces of the right conductive box (51) are respectively provided with a protruding third conductive ring (52) and a fourth conductive ring (53); the second conductive ring (43) and the fourth conductive ring (53) are connected for electrical conduction via a plurality of first conductive bars (9); in a use state, the first conductive ring (42) is electrically connected to the left isolated phase busbar (1) via a plurality of second conductive bars (6), and the third conductive ring (52) is electrically connected to the right isolated phase busbar (2) via a plurality of third conductive bars (7); The outer shell (8) comprises a left outer cylinder (81) and a right outer cylinder (82); the left inner conductor (4) is installed in the left outer cylinder (81) via a plurality of insulators (10); the right inner conductor (5) is installed in the right outer cylinder (82) via a plurality of insulators (10); the left outer cylinder (81) and the right outer cylinder (82) are connected to each other via a corrugated sleeve (83); in a use state, the left outer cylinder (81) and the outer shell of the left isolated phase busbar (1) are connected and sealed via a left cover shell (84); and the right outer cylinder (82) and the outer shell of the right isolated phase busbar (2) are connected and sealed via a right cover shell (85); The outer walls of the opposite ends of the left outer cylinder (81) and the right outer cylinder (82) are also provided with protective covers, and the corrugated sleeve (83) is located inside the protective covers; The protective cover comprises connecting rings (86) respectively mounted on the left outer cylinder (81) and the right outer cylinder (82), and telescopic rings (87) are sleeved on the outside of the connecting rings (86) on both sides; the telescopic rings (87) can be sleeved on the left outer cylinder (81), and can be moved from the left outer cylinder (81) and mounted on the connecting rings (86) on both sides; A mounting seat (88) is provided at the bottom of the outer shell (8).

2. A generator circuit breaker fault rapid replacement device according to claim 1, characterized in that: The second conductive bar (6) and the third conductive bar (7) are flexible conductive bars.

3. A generator circuit breaker fault rapid replacement device according to claim 1, characterized in that: The bolt holes for connecting the first conductive row (9) with the second conductive ring (43) and the fourth conductive ring (53) are long holes.

4. A generator circuit breaker fault rapid replacement device according to claim 1, characterized in that: An observation window (89) is provided on the outer shell (8).

5. A method for installing a generator circuit breaker fault rapid replacement device, characterized in that: For installation of a generator circuit breaker fault rapid replacement device according to claim 1, the installation method comprises the following steps: S1. When the generator circuit breaker fails, remove the faulty generator circuit breaker; S2. The left cover (84) is placed on the outer shell of the left phase-separated busbar (1), and the combination of the left inner conductor (4) and the left outer cylinder (81) is hoisted to the base support frame (20) at the installation position, and the mounting seat (88) below the left outer cylinder (81) is connected to the base support frame (20) by bolts; S3. Mounting a plurality of second conductive bars (6) on the left-side phase-separated busbar (1) and the first conductive ring (42) by bolts; S4. Move the left cover (84) to the right until it is connected to the left outer cylinder (81), and install the annular left cover (84) to the housing of the left phase-separated busbar (1) and the left outer cylinder (81) by bolts to close the gap between the housing of the left phase-separated busbar (1) and the left outer cylinder (81); S5. The telescopic ring (87) is put on the left outer cylinder (81) for standby use; S6. The right cover (85) is placed on the outer shell of the right phase-isolated busbar (2), and the right inner conductor (5) and the right outer cylinder (82) are hoisted to the base support frame (20) at the installation position, and the mounting seat (88) below the right outer cylinder (82) is connected to the base support frame (20) by bolts; S7. Mounting a plurality of third conductive bars (7) on the third conductive ring (52) and the right-side isolated-phase busbar (2) by bolts; S8. Move the right cover (85) to the left until it is connected to the right outer cylinder (82), and install the annular right cover (85) to the outer shell of the right phase-separated busbar (2) and the right outer cylinder (82) by bolts to close the gap between the outer shell of the right phase-separated busbar (2) and the right outer cylinder (82); S9. The corrugated sleeve (83) is placed on the left outer cylinder (81) or the right outer cylinder (82), and the corrugated sleeve (83) is located near one end of the connecting ring (86); S10. Mounting two ends of the plurality of first conductive bars (9) onto the second conductive ring (43) and the fourth conductive ring (53) by means of bolts; S11. The corrugated sleeve (83) is then pulled open so that the two ends of the corrugated sleeve (83) are respectively located on the left outer cylinder (81) and the right outer cylinder (82), and the two ends of the corrugated sleeve (83) are respectively connected and fixed to the left outer cylinder (81) and the right outer cylinder (82) by a clamp; S12. Move the telescopic ring (87), put the telescopic ring (87) on the connecting ring (86), and fix the two ends of the telescopic ring (87) to the connecting rings (86) on both sides by bolts, thereby completing the segmented assembly and closure of the entire replacement device.

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