Disassembly maintenance method for moving arc contact of GCB arc extinguish chamber
By using a series of tool-assisted maintenance methods, the problem of severe ablation of the GCB arc-extinguishing chamber arc contacts in high-voltage AC circuit breakers is solved, and more efficient maintenance quality is achieved, ensuring the safe and stable operation of the circuit breaker.
Patent Information
- Application Number
- CN202411417748.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-02-18
AI Technical Summary
In high-voltage AC circuit breakers, the arc contacts of the GCB arc extinguishing chamber will be ablated in large quantities during the short circuit current, which will lead to difficulties in maintenance and affect the safe and stable operation of the circuit breaker.
A series of tooling auxiliary maintenance methods are adopted, including fixed tooling, limit tooling, protective cover disassembly and assembly tooling, T-shaped tooling, etc. Through these tooling, the arc contacts can be disassembled and installed more easily to achieve their disassembly maintenance.
The maintenance quality and efficiency of the GCB arc-extinguishing chamber arc contacts are improved, the safe and stable operation of high-voltage AC circuit breakers are ensured, and reference methods are provided for the on-site maintenance of other types of GCB arc-extinguishing chamber arc contacts.
Smart Images
Figure CN119480497A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of high-voltage circuit breaker maintenance, and in particular to a method for disassembling and repairing a moving arc contact of a GCB arc extinguishing chamber. Background Art
[0002] The GCB arc extinguishing chamber moving arc contact is an important component of the high-voltage AC circuit breaker. In the opening and closing operation of the AC circuit breaker, the arc extinguishing chamber moving arc contact is the most important moving part in the opening and closing action of the high-voltage AC circuit breaker, and it is also the core component that can break the AC large current for arc extinguishing operation. The arc extinguishing chamber moving arc contact of the circuit breaker described in this patent can break the short-circuit current between 170~190kA. This type of circuit breaker is currently an important equipment for the configuration of a million-level generator set. Therefore, the GCB arc extinguishing chamber moving arc contact is a core component of the circuit breaker.
[0003] In the process of breaking short-circuit current, the moving arc contact of the GCB arc extinguishing chamber will burn a lot of moving contact parts of the arc extinguishing chamber because the short-circuit current it breaks is about seven or eight times its rated operating current. It can be said that the burning condition of the moving arc contact of the GCB arc extinguishing chamber and the stability of the internal structure have always been a key concern in maintenance. According to the current operation and maintenance experience, a high-voltage AC circuit breaker can only break a short-circuit current four or five times at most. Therefore, in order to ensure that the high-voltage AC circuit breaker can successfully break the short-circuit current every time, the core is that the moving arc contact of the GCB arc extinguishing chamber can operate normally. Therefore, the maintenance quality of the moving arc contact of the GCB arc extinguishing chamber is directly related to the safe and stable operation of the high-voltage AC circuit breaker, and even more to the safety and stability of the power system. Therefore, the maintenance of the moving arc contact of the GCB arc extinguishing chamber is a very important project content. Summary of the invention
[0004] In order to solve the current technical problems, the main purpose of the present invention is to provide a method for disassembling and repairing the moving arc contact of the GCB arc extinguishing chamber, which can smoothly complete the repair work of the important component of the moving arc contact of the GCB arc extinguishing chamber, ensure the overall quality of the repair of the moving arc contact of the GCB arc extinguishing chamber, and ensure the safe and stable operation of the high-voltage AC circuit breaker.
[0005] The technical solution adopted by the present invention is: a method for disassembling and repairing a moving arc contact of a GCB arc extinguishing chamber, comprising the following steps: S1. Install the moving arc contact to be dismantled and repaired on the fixed tooling; S2. Remove the arc contact support; S3, removing the protective cover and the tube core; S4, remove the travel rod and the connecting arm; S5. Remove the guide piston; S6. Remove the moving arc contact shaft; S7, measurement of the electrical life of the moving arc contact shaft; S8, Replace the seal inside the moving arc contact; S9. Reinstall the moving arc contact.
[0006] In S1, the moving arc contact to be repaired is hoisted and placed on the fixed fixture, with the positioning protrusion at the tail of the moving arc contact facing downward, and then the end of the moving arc contact is connected and fixed to the bracket of the fixed fixture with bolts.
[0007] In S2, a hot air gun is used to heat the threads connecting the arc contact support and the moving arc contact housing to melt the internal thread glue at the threads. After the thread glue melts, a protective cover disassembly and assembly tool is installed at the end of one side of the protective cover, and then the limit tool is connected to the fixed tool. The limit tool is provided with a limit hole corresponding to the position of the protective cover disassembly and assembly tool. One end of the protective cover disassembly and assembly tool extends out of the limit hole. A wrench is clamped in the end of the protective cover disassembly and assembly tool extending out of the limit hole, and the arc contact support is rotated to disassemble. Finally, the limit tool and the protective cover disassembly and assembly tool are removed to remove the arc contact support.
[0008] In S3, use a wrench to remove the fixing bolts on the protective cover, take out the protective cover, and pull the tube core out from the inside of the moving arc contact housing.
[0009] In S4, use a wrench to remove the bolts fixing the travel rod, remove the travel rod and the insulating part installed at the tail of the moving arc contact, wipe the old travel rod clean, measure the length and diameter of the old travel rod, and record them; then use a wrench to remove the axle pin bolt between the guide piston and the connecting crank arm, and remove the axle pin and the two connecting crank arms.
[0010] In S5, the T-shaped tooling is inserted into the moving arc contact shaft, and then the T-shaped tooling is bolted to the moving arc contact housing. At this time, the inner polygon on the T-shaped tooling is inserted into the outer polygon of the moving arc contact shaft; the locating pin of the guide piston is heated with a hot air gun, and the locating pin is removed with a tool, and then a fork-shaped wrench is inserted into the ear seat at the tail of the guide piston, and the fork-shaped wrench is turned to loosen the guide piston, take out the guide piston, and finally remove the T-shaped tooling.
[0011] In S6, the moving arc contact shaft is taken out from the moving arc contact housing, the wave ring and the guide ring on the moving arc contact shaft are removed, and the anti-wear ring inside the moving arc contact housing, the guide ring of the guide piston, and the guide ring inside the protective cover are taken out.
[0012] In S7, wipe the removed moving arc contact shaft clean and check the ablation condition of the end of the moving arc contact shaft; measure the length and diameter of the moving arc contact shaft with a measuring tool with an accuracy of not less than 0.1mm, and record them; determine whether the moving arc contact shaft needs to be replaced based on the number of operations of the circuit breaker and the number of times the operating current and short-circuit current are interrupted; if the moving arc contact shaft is not replaced, use a scouring pad to clean the ablation damage of the moving arc contact shaft, arc contact support, and protective cover.
[0013] In S8, apply conductive paste to the inside of the protective cover and the moving arc contact housing, replace the guide ring inside the protective cover, and replace the anti-wear ring inside the moving arc contact housing; Apply conductive paste to the guide ring of the guide piston, replace the new guide ring, and align the positioning hole on the guide ring with the positioning hole of the guide piston; Apply conductive paste to the surface of the wave ring and guide ring of the arc contact shaft, replace the new wave ring and guide ring, and install the openings of the wave ring and guide ring in a 180° direction.
[0014] In S9, reinstall the tube core inside the moving arc contact housing with the tube core positioning pin facing downward, insert the moving arc contact shaft into the moving arc contact housing, and install the T-shaped tooling to fix it; Reinstall the guide piston at the rear of the moving arc contact housing, tighten the guide piston with a fork wrench, and tighten the torque; apply thread locking glue on the positioning pin, use a tool to tighten the positioning pin into the positioning groove of the guide piston and tighten the torque; Reinstall the protective cover on the moving arc contact shaft, align the positioning groove on the protective cover with the positioning pin on the tube core; apply thread locking glue to the fastening bolts on the protective cover, and then tighten the bolts with a wrench and tighten to the torque; Reinstall the arc contact support; apply locking glue on the threads of the arc contact support, manually tighten the arc contact support first, then install the protective cover disassembly and assembly tooling and the limit tooling, use the tool to twist the protective cover disassembly and assembly tooling, tighten the arc contact support and tighten the torque; Reinstall the connecting crank arm and travel rod; apply grease evenly to the surfaces of the reinstalled connecting crank arm and travel rod, reinstall the connecting crank arm with a new shaft pin and shaft sleeve, and make the direction of the elbow of the connecting crank arm consistent with the direction of the opening at the tail of the arc contact housing. Apply thread locking glue on the shaft pin thread, tighten the bolts on the shaft pin and apply torque, and check that the connecting crank arm can rotate freely without jamming after reinstallation, and finally reinstall the travel rod to the moving arc contact housing; Movement detection of moving arc contact: After reinstalling the components of the moving arc contact, pull the moving arc contact to open and close, and if the movement of the moving arc contact is normal, the inspection is completed.
[0015] The present invention has the following beneficial effects: The present invention proposes a disassembly and maintenance method for a GCB arc extinguishing chamber moving arc contact, which mainly includes adopting a series of tooling to assist in the maintenance of the GCB arc extinguishing chamber moving arc contact, such as a fixed tooling, a limit tooling, a protective cover disassembly and assembly tooling, a T-shaped tooling, etc. Through these tooling, the GCB arc extinguishing chamber moving arc contact can be more conveniently disassembled and assembled, and the maintenance is more convenient, flexible, time-saving and labor-saving. It can not only ensure the overall quality of the maintenance of the GCB arc extinguishing chamber moving arc contact, ensure the safe and stable operation of the high-voltage AC circuit breaker, thereby ensuring the safe and stable operation of the power system, but also provide a reference method for the on-site maintenance of other types of GCB arc extinguishing chamber moving arc contacts. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 This is a schematic diagram of installing the moving arc contact on the fixed tooling.
[0018] Figure 2 The figure is a schematic diagram of installing the protective cover disassembly and assembly tool and the limit tool onto the moving arc contact housing.
[0019] Figure 3 Schematic diagram of the internal structure of the moving arc contact.
[0020] Figure 4 It is a schematic diagram of the structure of the tail of the moving arc contact.
[0021] Figure 5 A schematic diagram of installing the T-shaped tooling onto the moving arc contact housing.
[0022] Figure 6 This is a schematic diagram of the T-shaped tooling inserted into the arc contact shaft.
[0023] Figure 7 This is a schematic diagram from another perspective of the T-shaped tooling being inserted into the arc contact shaft.
[0024] Reference numerals: Moving arc contact 100, positioning protrusion 101, arc contact support 102, protective cover 103, tube core 104, travel rod 105, connecting arm 106, guide piston 107, ear seat 1071, moving arc contact shaft 108, outer polygon 1081, positioning pin 109; Fixing tool 200, bracket 201; Limiting tool 300, limiting hole 301, protective cover disassembly tool 302; T-shaped tooling 400 , inner polygon 401 . DETAILED DESCRIPTION
[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0026] like Figure 1-7 As shown, the present invention provides a method for disassembling and repairing a moving arc contact of a GCB arc extinguishing chamber, comprising the following steps: S1. Install the moving arc contact 100 to be disassembled and repaired onto the fixed tooling 200.
[0027] See also Figure 1 In S1, the moving arc contact 100 to be repaired is hoisted and placed on the fixed tooling 200, with the positioning protrusion 101 at the tail of the moving arc contact 100 facing downward, and then the end of the moving arc contact 100 is connected and fixed to the bracket 201 of the fixed tooling 200 with bolts to ensure the stability of the moving arc contact 100 during disassembly and assembly.
[0028] S2. Remove the arc contact support 102.
[0029] See also Figure 2 In S2, a hot air gun is used to heat the threads connecting the arc contact support 102 and the moving arc contact housing to melt the internal thread glue at the threads. After the thread glue melts, a protective cover disassembly tool 302 is installed at the end of one side of the protective cover 103, and then the limiting tool 300 is connected to the fixing tool 200. The limiting tool 300 is provided with a limiting hole 301 corresponding to the position of the protective cover disassembly tool 302. One end of the protective cover disassembly tool 302 extends out of the limiting hole 301. A wrench is clamped in the end of the protective cover disassembly tool 302 extending out of the limiting hole 301, and the arc contact support 102 is rotated and disassembled. Finally, the limiting tool 300 and the protective cover disassembly tool 302 are removed to disassemble the arc contact support 102.
[0030] One end of the protective cover disassembly tool 302 is adapted and fixed to the hole at the end of the arc contact support 102, and the other end is a polygonal part, which extends out of the limiting hole 301 to facilitate twisting with a wrench. The limiting tool 300 mainly plays a limiting role, which is used to ensure the position of the protective cover disassembly tool 302 to prevent the protective cover disassembly tool 302 from tilting when force is applied to the protective cover disassembly tool 302 with a wrench, causing the hole at the end of the arc contact support 102 to deform.
[0031] S3, removing the protective cover 103 and the tube core 104.
[0032] See also Figure 3 In S3, the fixing bolts on the protective cover 103 are removed with a wrench, the protective cover 103 is taken out, and the tube core 104 is pulled out from the inside of the moving arc contact housing.
[0033] S4, remove the travel rod 105 and the connecting arm 106.
[0034] See also Figure 4 In S4, use a wrench to remove the bolts fixing the travel rod 105, remove the travel rod 105 and the insulating part installed at the tail of the moving arc contact 100, wipe the old travel rod 105 clean, measure the length and diameter of the old travel rod 105, and record them; then use a wrench to remove the shaft pin bolt between the guide piston 107 and the connecting crank arm 106, and remove the shaft pin and the two connecting crank arms 106.
[0035] S5. Remove the guide piston 107.
[0036] See also Figure 3-7 In S5, the T-shaped tooling 400 is inserted into the moving arc contact shaft 108, and then the T-shaped tooling 400 is bolted to the moving arc contact housing. At this time, the inner polygon 401 on the T-shaped tooling 400 is inserted into the outer polygon 1081 of the moving arc contact shaft 108; the positioning pin 109 of the guide piston 107 is heated with a hot air gun, and the positioning pin 109 is removed with a tool, and then a fork-shaped wrench is inserted into the ear seat 1071 at the tail of the guide piston 107, and the fork-shaped wrench is turned to loosen the guide piston 107, and the guide piston 107 is taken out, and finally the T-shaped tooling 400 is removed.
[0037] The T-shaped fixture 400 is used to fix the moving arc contact shaft 108 , so that the guide piston 107 can be easily removed.
[0038] S6. Remove the moving arc contact shaft 108.
[0039] See also Figure 3 In S6, the moving arc contact shaft 108 is taken out from the moving arc contact housing, the wave ring and the guide ring on the moving arc contact shaft 108 are removed, and the anti-wear ring inside the moving arc contact housing, the guide ring of the guide piston 107, and the guide ring inside the protective cover 103 are taken out.
[0040] S7. Measurement of electrical life of moving arc contact shaft 108.
[0041] In S7, the removed moving arc contact shaft 108 is wiped clean and the ablation condition of the end of the moving arc contact shaft 108 is checked; the length and diameter of the moving arc contact shaft 108 are measured with a measuring tool with an accuracy of not less than 0.1mm and recorded; and whether the moving arc contact shaft 108 needs to be replaced is determined based on the number of operations of the circuit breaker and the number of times the operating current and the short-circuit current are interrupted.
[0042] If the moving arc contact shaft 108 is not replaced, the ablation damage of the moving arc contact shaft 108, the arc contact support 102 and the protective cover 103 shall be polished clean with a scouring pad.
[0043] S8. Replace the seal inside the moving arc contact 100.
[0044] In S8 , conductive paste is applied to the inside of the protective cover 103 and the moving arc contact housing, the guide ring inside the protective cover 103 is replaced, and the anti-wear ring inside the moving arc contact housing is replaced.
[0045] Apply conductive paste to the guide ring of the guide piston 107, replace the new guide ring, and slightly align the positioning hole on the guide ring with the positioning hole of the guide piston.
[0046] Apply conductive paste to the surface of the wave ring and guide ring of the arc contact shaft 108, replace the new wave ring and guide ring, and install the openings of the wave ring and guide ring in a 180° direction.
[0047] S9, reinstall the moving arc contact 100.
[0048] In S9, the tube core 104 is reinstalled inside the moving arc contact housing with the tube core positioning pin facing downward, the moving arc contact shaft 108 is inserted into the moving arc contact housing, and a T-shaped tool is installed to fix it.
[0049] Reinstall the guide piston 107 at the rear of the moving arc contact housing, tighten the guide piston 107 with a fork wrench, and tighten the torque; apply thread locking glue on the positioning pin 109, use a tool to tighten the positioning pin into the positioning groove of the guide piston and tighten the torque.
[0050] Reinstall the protective cover 103 on the moving arc contact shaft 108, align the positioning groove on the protective cover 103 with the positioning pin on the tube core 104; apply thread locking glue to the fastening bolts on the protective cover, and then tighten the bolts with a wrench and tighten the torque.
[0051] The arc contact support 102 is reinstalled; a locking glue is applied to the thread of the arc contact support 102, the arc contact support 102 is manually tightened first, and then the protective cover disassembly and assembly tool 302 and the limit tool 300 are installed, the protective cover disassembly and assembly tool 302 is twisted with a tool, and the arc contact support 102 is tightened and tightened to a torque.
[0052] Reinstall the connecting crank arm 106 and the travel rod 105; evenly apply grease to the surfaces of the reinstalled connecting crank arm 106 and the travel rod 105, reinstall the connecting crank arm 106 with a new axle pin and sleeve, and make the direction of the elbow of the connecting crank arm 106 consistent with the direction of the hole at the rear end of the arc contact housing, apply thread locking glue on the axle pin thread, tighten the bolts on the axle pin and apply torque, and check that the connecting crank arm 106 can rotate freely without jamming after reinstallation, and finally reinstall the travel rod 105 to the moving arc contact housing.
[0053] Movement detection of moving arc contact: After the components of the moving arc contact 100 are reinstalled, the moving arc contact is pulled to separate and close, and the inspection is completed if the movement of the moving arc contact is normal.
[0054] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for disassembling and repairing the moving arc contact of a GCB arc extinguishing chamber, characterized in that: The following steps are involved: S1. Installing the moving arc contact (100) to be disassembled and repaired onto a fixed tool (200); S2, remove the arc contact support (102); S3, removing the protective cover (103) and the tube core (104); S4, removing the travel rod (105) and the connecting arm (106); S5. Remove the guide piston (107); S6. Remove the moving arc contact shaft (108); S7, electrical life measurement of moving arc contact shaft (108); S8. Replace the seal inside the moving arc contact (100); S9. Reinstall the moving arc contact (100).
2. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S1, the moving arc contact (100) to be repaired is hoisted and placed on the fixed fixture (200), with the positioning protrusion (101) at the tail of the moving arc contact (100) facing downward, and the end of the moving arc contact (100) is connected and fixed to the bracket (201) of the fixed fixture (200) using bolts.
3. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S2, a hot air gun is used to heat the threads connecting the arc contact support (102) and the moving arc contact housing to melt the internal thread glue at the threads. After the thread glue is melted, a protective cover disassembly tool (302) is installed at the end of one side of the protective cover (103). The limiting tool (300) is then connected to the fixing tool (200). The limiting tool (300) is provided with a limiting hole (301) at a position corresponding to the protective cover disassembly tool (302). One end of the protective cover disassembly tool (302) extends out of the limiting hole (301). A wrench is clamped at the end of the protective cover disassembly tool (302) extending out of the limiting hole (301). The arc contact support (102) is rotated to be disassembled. Finally, the limiting tool (300) and the protective cover disassembly tool (302) are removed to disassemble the arc contact support (102).
4. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S3, the fixing bolts on the protective cover (103) are removed with a wrench, the protective cover (103) is taken out, and the tube core (104) is pulled out from the inside of the moving arc contact housing.
5. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S4, a wrench is used to remove the bolts fixing the travel rod (105), the travel rod (105) and the insulating member installed at the tail of the moving arc contact (100) are removed, the old travel rod (105) is wiped clean, and the length and diameter of the old travel rod (105) are measured and recorded; then, a wrench is used to remove the shaft pin bolt between the guide piston (107) and the connecting crank arm (106), and the shaft pin and the two connecting crank arms (106) are removed.
6. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S5, the T-shaped fixture (400) is inserted into the moving arc contact shaft (108), and then the T-shaped fixture (400) is bolted to the moving arc contact housing. At this time, the inner polygon (401) on the T-shaped fixture (400) is inserted into the outer polygon (1081) of the moving arc contact shaft (108); the positioning pin (109) of the guide piston (107) is heated with a hot air gun, and the positioning pin (109) is removed with a tool, and then a fork-shaped wrench is inserted into the ear seat (1071) at the rear of the guide piston (107), and the fork-shaped wrench is rotated to loosen the guide piston (107), and the guide piston (107) is taken out, and finally the T-shaped fixture (400) is removed.
7. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S6, the moving arc contact shaft (108) is taken out from the moving arc contact housing, the wave ring and the guide ring on the moving arc contact shaft (108) are removed, and the anti-wear ring inside the moving arc contact housing, the guide ring of the guide piston (107), and the guide ring inside the protective cover (103) are taken out.
8. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S7, the removed moving arc contact shaft (108) is wiped clean and the ablation condition of the end of the moving arc contact shaft (108) is checked; the length and diameter of the moving arc contact shaft (108) are measured with a measuring tool with an accuracy of not less than 0.1 mm and recorded; whether the moving arc contact shaft (108) needs to be replaced is determined based on the number of operations of the circuit breaker and the number of times the operating current and the short-circuit current are interrupted; if the moving arc contact shaft (108) is not replaced, the ablation damage of the moving arc contact shaft (108), the arc contact support (102) and the protective cover (103) is polished clean with a scouring pad.
9. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S8, conductive paste is applied to the inside of the protective cover (103) and the moving arc contact housing, the guide ring inside the protective cover (103) is replaced, and the anti-wear ring inside the moving arc contact housing is replaced; Apply conductive paste to the guide ring of the guide piston (107), replace the new guide ring, and align the positioning hole on the guide ring slightly with the positioning hole of the guide piston; Apply conductive paste to the surface of the wave ring and guide ring of the arc contact shaft (108), replace the new wave ring and guide ring, and install the openings of the wave ring and guide ring in a 180° direction.
10. A method for disassembling and repairing moving arc contacts of a GCB interrupter according to claim 1, characterized in that: In S9, the tube core (104) is reinstalled inside the moving arc contact housing, with the tube core positioning pin facing downward, the moving arc contact shaft (108) is inserted into the moving arc contact housing, and a T-shaped tool is installed to fix it; Reinstall the guide piston (107) at the rear of the moving arc contact housing, tighten the guide piston (107) with a fork wrench, and tighten the torque; apply thread locking glue to the positioning pin (109), tighten the positioning pin into the positioning groove of the guide piston with a tool, and tighten the torque; Reinstall the protective cover (103) on the moving arc contact shaft (108), aligning the positioning groove on the protective cover (103) with the positioning pin on the tube core (104); apply thread locking glue to the fastening bolts on the protective cover, and then tighten the bolts with a wrench and tighten to the tightening torque; The arc contact support (102) is reinstalled; a locking glue is applied to the thread of the arc contact support (102), the arc contact support (102) is manually tightened, and then the protective cover disassembly tool (302) and the limit tool (300) are installed, and the protective cover disassembly tool (302) is screwed with a tool, and the arc contact support (102) is tightened and tightened to a torque; Reinstall the connecting crank arm (106) and the travel rod (105); evenly apply grease to the surfaces of the reinstalled connecting crank arm (106) and the travel rod (105), reinstall the connecting crank arm (106) with a new shaft pin and shaft sleeve, and make the direction of the elbow of the connecting crank arm (106) consistent with the direction of the opening at the rear end of the arc contact housing, apply thread locking glue to the shaft pin thread, tighten the bolt on the shaft pin and apply torque, and check that the connecting crank arm (106) can rotate freely without jamming after reinstallation, and finally reinstall the travel rod (105) on the moving arc contact housing; Movement detection of the moving arc contact: After the various components of the moving arc contact (100) are reassembled, the moving arc contact is pulled to separate and close. If the movement of the moving arc contact is normal, the inspection is completed.