A disconnecting switch for converting a GW17-type disconnecting switch into a GW7-type and method thereof

Abstract

The present invention relates to the technical field of on-site technical transformation and status inspection of high-voltage disconnectors, and in particular to a GW17 type disconnector and method for transforming it into a GW7 type disconnector. The method comprises the following steps: on-site survey of the original GW17 type disconnector equipment body to determine the key points in the equipment transformation; on-site survey of the modified disconnector and consultation of blueprint materials to change the design structure to be consistent with the on-site application and the size of the disconnector after the transformation; based on the status of the modified disconnector, the mechanism and static side insulator are reused; calculation of the reduction in on-site power outage time and on-site engineering workload compared with replacing the entire set of disconnectors; on-site transformation of the original disconnector; and on-site testing and assessment of the parameters of the modified disconnector. The method effectively eliminates the serious problems that occur with the GW17 type disconnector after long-term operation in severely cold and windy areas, shortens on-site power outage time, reduces workload, reduces engineering cost and costs, and ensures the safe and stable operation of power grid equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of on-site technical transformation and condition maintenance of high-voltage disconnectors, and in particular to a method for transforming a GW17 type disconnector into a GW7 type disconnector, specifically a technical transformation method for an AC high-voltage disconnector and a technical application for on-site equipment maintenance. Background Art

[0002] Northern China is characterized by cold weather, large temperature swings between day and night, and across the four seasons. Inclement weather conditions such as sandstorms, rain, snow, and freezing temperatures are common. In substation applications, GW17 disconnectors have shown significant degradation over time. These issues include transmission jamming, improper opening and closing, porcelain cylinder breakage due to excessive torque during knife switch operation, rusted components, and overheating of the main conductive circuit. These issues pose a significant threat to the safe and stable operation of the power grid, as well as to the safety of personnel and equipment. These issues represent significant equipment defects and potential safety hazards in production safety. Summary of the Invention

[0003] To address the numerous issues that arise with the prior art GW17 disconnectors after long-term operation in northern China, the present invention provides a method for converting a GW17 disconnector into a GW7 type. This method aims to effectively eliminate serious issues that can arise with GW17 disconnectors after prolonged operation in cold and windy northern regions, such as transmission jamming, improper opening and closing, porcelain bottle breakage due to excessive torque during knife switch operation, component rust, and heating of the main conductive circuit.

[0004] In order to achieve the above-mentioned object of the invention, the present invention is implemented by the following technical solutions:

[0005] A GW17 type disconnector is modified into a GW7 type disconnector, comprising: the original equipment foundation and frame, a transmission shaft, a main switch, a ground switch, a static contact and a moving contact, wherein: the main switch rotates 70 degrees to close the circuit breaker counterclockwise; the ground switch mechanism rotates 90 degrees to close the circuit breaker clockwise; the static contact and the static contact finger are connected by a crimping spring, and the spring crimping bolts are connected to the housings of the left and right static contacts, adopting a bolt-fixed crimping method; a closing hook is provided on the outside of the static contact, and after the conductive tube moving contact completes the closing action, it is tightly and reliably connected to the static contact finger, and at the same time, the closing hook on the outside of the static contact blocks the conductive tube moving contact; the static contacts include: a left static contact and a right static contact, and the moving contact is a conductive tube moving contact.

[0006] A method for converting a GW17 type disconnector into a GW7 type disconnector comprises the following steps:

[0007] Step 1: Conduct an on-site survey of the original GW17 type disconnector equipment to determine the key points in equipment modification;

[0008] Step 2: Through on-site survey of the modified disconnector and review of blueprints, change the product design structure to make it consistent with the on-site application and the dimensions of the modified GW7 disconnector;

[0009] Step 3: Based on the specific status of the modified GW17 disconnector, reuse the mechanism and static side insulators, and ensure that the safety distance from surrounding live equipment is met after the disconnector is opened.

[0010] Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set;

[0011] Step 5: Convert the original GW17 isolating switch to GW7 isolating switch on site;

[0012] Step 6: Conduct on-site test and assessment on the parameters between the contact fingers of the modified GW7 type disconnector.

[0013] The parameters between the contact fingers of the modified GW7 type disconnector include: contact reliability, operation smoothness, impact force on the fixed insulators at both ends, closing circuit resistance and equipment current capacity.

[0014] In step 1, an on-site survey of the original GW17 type disconnector equipment body is conducted to determine the key points in the equipment modification, including understanding the equipment system operation mode, operating conditions, meteorological conditions, and pollution level, investigating the types and causes of faults and defects that occur during operation, and making this the key point to be resolved in the equipment modification.

[0015] In step 2, by conducting on-site inspection of the modified disconnector and consulting blueprint data, the design structure of the universal GW7 disconnector is modified to make it consistent with the size of the GW7 disconnector after on-site application and modification.

[0016] In step 3, based on the specific status of the modified GW17 type disconnector, including whether the mechanism parameters meet the operating requirements, whether the transmission components are damaged, whether the positions of the vertical transmission rods of the main switch and the ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for the modification, whether the primary conductor size meets the lap joint requirements after the modification, whether the size and bending and torsional resistance of the supporting porcelain bottle meet the technical requirements of the modified GW7 type disconnector, and the anti-pollution level of the original porcelain bottle, the mechanism and the static side insulator are reused, and the safety distance requirements from the surrounding live equipment are met after the switch is opened.

[0017] Compared with replacing the entire disconnector set, the calculation in step 4 reduces on-site power outage time and on-site engineering workload. It is based on the equipment operating conditions obtained from the on-site survey and the various technical parameters and structures of the equipment being modified, to determine the number of parts that can be retained, the number of parts that need to be replaced, and the amount of engineering workload that requires modification of the equipment foundation and structure.

[0018] In step 5, the on-site transformation of the original GW17 type disconnector into a GW7 type disconnector mainly includes:

[0019] Step 5.1: According to the product design structure of the on-site transformation, construct the original equipment foundation and frame;

[0020] Including foundation reinforcement and leveling repairs;

[0021] Step 5.2: According to the product design structure of the on-site modification, construct the original equipment support porcelain bottle and rotating porcelain bottle; reuse or replace the drive shaft to meet the modified main knife angle of 90° and counterclockwise closing; ground knife mechanism angle of 90° and clockwise closing;

[0022] Step 5.3: According to the design structure of the product to be modified on site, install the main cutter and ground cutter of the original equipment; reuse or replace the drive shaft, turn the main cutter 70 degrees and close it counterclockwise; turn the ground cutter mechanism 90 degrees and close it clockwise;

[0023] Step 5.4: Construction of static and moving contacts;

[0024] The static contacts include: left static contact and right static contact, and the moving contact is a conductive tube moving contact;

[0025] The static contact and the static contact finger are connected by a compression spring. The spring compression bolt is connected to the housing of the left and right static contacts, and is fixed with bolts. A closing hook plate is provided on the outside of the static contact. After the moving contact of the conductive tube completes the closing action, it is tightly connected with the static contact finger. At the same time, the closing hook plate on the outside of the static contact blocks the moving contact of the conductive tube, so that it cannot be dislodged from the static contact under the action of external force, and the switch always remains stable.

[0026] In step 6, the technical parameters of the modified GW7 type disconnector are subjected to on-site testing and assessment, including: key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, operation smoothness, impact force on the fixed insulators at both ends, closing circuit resistance and equipment current capacity, to meet safety regulations and on-site operation requirements.

[0027] The method comprises:

[0028] Step 1: Conduct an on-site survey of the original GW17 disconnector equipment to understand the equipment system's operating mode, operating conditions, meteorological conditions, and pollution levels. Investigate the types and causes of faults and defects that occur during operation, and identify these as key issues to be addressed during equipment modification.

[0029] Step 2: Through on-site inspection of the modified disconnector and review of relevant blueprint materials, the design structure of the GW7 disconnector is modified to make it consistent with the on-site application and the dimensions of the modified GW7 disconnector; the modified disconnector is consistent with the key interfaces of the original equipment;

[0030] Step 3: Based on the specific status of the GW17 disconnector equipment being modified, including whether the mechanism parameters meet the operating requirements, whether the transmission components are damaged, whether the vertical transmission rod positions of the main switch and ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for modification, whether the primary conductor size meets the lap joint requirements after modification, whether the supporting porcelain bottle size and bending and torsional resistance meet the technical requirements of the modified GW7 disconnector, and the pollution resistance level of the original porcelain bottle, the mechanism and static side insulators are reused, and the safety distance requirements from surrounding live equipment are met after the switch is opened;

[0031] Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set. Based on the equipment operating conditions obtained from the on-site survey and the technical parameters and structure of the equipment being modified, determine the number of components that can be retained, the number of components that need to be replaced, and the amount of engineering workload required for the equipment foundation and structure modification. Based on the results of the above on-site survey, calculate the quantity of main and auxiliary materials required for the modification project.

[0032] Step 5: On-site conversion of the original GW17 isolating switch to a GW7 isolating switch is achieved by:

[0033] Step 5.1: According to the product design structure of the on-site transformation, construct the original disconnector foundation and frame;

[0034] Step 5.2: Based on the product design structure of the on-site renovation, construct the original equipment's supporting porcelain bottles and rotating porcelain bottles. Decide whether to reuse or replace the supporting porcelain bottles. Install the intermediate rotating porcelain bottles. The installation height and size of the porcelain bottles should be designed according to the pollution level of the substation location.

[0035] Step 5.3: According to the design structure of the product to be modified on site, install the main cutter and ground cutter of the original equipment; reuse or replace the transmission rod, turn the main cutter 70 degrees counterclockwise to close the switch; turn the ground cutter mechanism 90 degrees clockwise to close the switch;

[0036] The control connection between the three phases of the disconnector adopts mechanical or electrical linkage. The mechanical linkage method realizes three-phase linkage through the horizontal connecting rod between the phases. The connecting rod is equipped with positive and negative thread bolts to achieve stepless adjustment. The electrical linkage method requires each phase to be equipped with a motor mechanism, and the three-phase linkage is realized through the electrical control between the three phases.

[0037] Step 5.4: Construction of static and moving contacts;

[0038] The static contacts include: left static contact and right static contact, and the moving contact is a conductive tube moving contact;

[0039] The static contact and the static contact finger are connected by a compression spring. The spring compression bolts are connected to the housings of the left and right static contacts. Bolt-fixed compression is adopted, and a pressure block is used instead of a flat washer.

[0040] A closing hook is provided on the outside of the static contact. After the moving contact completes the closing action, it is tightly connected with the static contact finger. At the same time, the closing hook on the outside of the static contact locks the moving contact, preventing it from coming out of the static contact under external force, and the switch always remains stable. The conductive tube turning transmission box is a closed structure.

[0041] Step 6: Conduct on-site test and assessment of the modified GW7 disconnector;

[0042] It mainly includes: assessing the key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, and operation smoothness of the modified GW7 type disconnector, as well as the impact force of the fixed insulators at both ends, closing circuit resistance, and equipment current capacity technical parameters to meet safety regulations and on-site operation requirements.

[0043] The construction of the main knife and ground knife of the original equipment includes: the ground knife adopts a one-step action structure, and the grounding knife contact adopts a self-powered structure; the vertical connecting rod connecting the main ground knife mechanism and the main body and the horizontal connecting rod connecting the three poles of the ground knife adopt a splint and clamp connection method, and the horizontal connecting rod connecting the three levels of the main knife adopts a positive and negative wire joint connection, both of which realize stepless adjustment.

[0044] Compared with the prior art, the present invention has the following advantages and beneficial technical effects:

[0045] The present invention provides a modified GW7 type disconnector, as well as a modification method and application, which can realize on-site modification of GW17 type disconnectors, effectively eliminating serious problems that GW17 type disconnectors may encounter after long-term operation in severely cold and windy northern regions, such as transmission jamming, improper opening and closing, porcelain bottle breakage due to excessive torque during knife switch operation, operational failure, component damage and deformation, component rust, and heating of the main conductive circuit. The modified disconnector adopts a flip-type structure, requiring only a small operating force to achieve reliable contact between the contact fingers; a fixed crimping connection is used between the static contact seat and the contact fingers, which makes the contact surface force more uniform and the flow more stable; the conductive tube flip transmission box is a sealed structure, which is rainproof and dustproof. Through these improvements, the operational reliability of this type of disconnector is improved, making it more suitable for the operating conditions of the Liaoning power grid. Compared with replacing the disconnector as a whole, it reduces on-site power outage time and on-site engineering workload; the modified GW7 type disconnector has reliable contact between the contact fingers, smooth operation, and low impact force on the fixed insulators at both ends, while reducing the closing circuit resistance and improving the equipment's flow capacity.

[0046] 2. The modification method of the present invention allows for on-site modification of GW17 switches without returning the equipment to the factory for repair. This method can shorten on-site power outages, reduce on-site workload, lower project costs, and ensure safe and stable operation of power grid equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0048] Figure 1 It is a flow chart of the transformation method of the present invention;

[0049] Figure 2 This is a flow chart of the on-site transformation of the original GW17 type disconnector into the GW7 type disconnector in the present invention;

[0050] Figure 3 This is a schematic diagram of the overall structure of the GW7 type disconnector after modification according to the present invention;

[0051] Figure 4 This is a schematic top view of the overall structure of the GW7 type disconnector after modification according to the present invention;

[0052] Figure 5 This is a schematic diagram of the closing process of the GW7F type disconnector after modification according to the present invention;

[0053] Figure 6 It is a schematic structural diagram of the conductive arm of the present invention;

[0054] Figure 7 It is a schematic diagram of the structure of the static contact hook plate of the present invention.

[0055] In the figure: post insulator 1, rotary insulator 2, conductive tube 3, transmission box 4, left terminal 5, left static contact 6 , right terminal 7, right static contact 8, base 9, bearing seat 10, left ground knife vertical transmission rod 11, right ground knife vertical transmission rod 12, main knife transmission rod 13, main knife electric mechanism 14, left grounding knife manual mechanism 15, right grounding knife manual mechanism 16, left grounding knife turning arm 17, left grounding knife 18, main knife transmission transition turning arm 19, right grounding knife 20, right grounding knife turning arm 21, main knife turning arm 22, left grounding 23, right grounding 24, static contact seat limit 25, rotating fork 26, conductive tube moving contact 27, hook plate 28, crimping spring 29, spring crimping bolt 30, static contact finger 31, conductive tube horizontal rotation 100; conductive tube enters static contact 200; middle rotating porcelain bottle rotates 300; conductive tube enters static contact 400; fork rotates 45° 500, closing ends 600. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0057] The present invention is a GW17 type disconnector converted into a GW7 type disconnector and a method. The GW17 type disconnector is converted into a GW7 type disconnector. The present invention changes the product design structure through on-site survey of the disconnector to be converted and consultation of blueprints and other relevant materials to make it consistent with the size of the converted GW7 type disconnector used on site. The converted GW7 type disconnector is a three-column horizontal rotating double-break type. This type of disconnector is very suitable for use in the cold and windy climate conditions in the northern region. The key interfaces of the converted equipment are consistent with those of the original equipment, the equipment foundation remains unchanged, the secondary line position remains unchanged, the transmission mechanism position remains unchanged, and the position of some primary leads remains unchanged. The mechanism is reused, the static side insulator is reused, and after opening, the safety distance requirements are met from the surrounding live equipment.

[0058] The present invention provides a method for transforming a GW17 type disconnector into a GW7 type disconnector, comprising the following steps:

[0059] Step 1: Conduct an on-site survey of the original GW17 type disconnector equipment to determine the key points in equipment modification;

[0060] Step 2: Through on-site inspection of the modified disconnector and review of blueprints and other relevant materials, change the product design structure to make it consistent with the on-site application and the dimensions of the modified GW7 disconnector;

[0061] Step 3: Based on the specific status of the equipment being modified, reuse the old mechanism and static side insulators, and ensure that the safety distance requirements are met from surrounding live equipment after the switch is opened;

[0062] Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set;

[0063] Step 5: Convert the original GW17 isolating switch to GW7 isolating switch on site;

[0064] Step 6: Conduct on-site tests and assessments on key technical parameters such as the contact reliability and movement smoothness between the contact fingers of the modified GW7 type disconnector, the impact force of the fixed insulators at both ends, the closing circuit resistance, and the current carrying capacity of the equipment.

[0065] In step 1, the original GW17 type disconnector equipment body is surveyed on site to understand the equipment system operation mode, operating conditions, meteorological conditions, pollution level, etc., and to investigate the types and causes of faults and defects that occur during operation, and these are taken as the key points to be solved in the equipment modification;

[0066] In step 2, by conducting on-site survey of the modified disconnector and consulting relevant information such as blueprints, a small change is made to the design structure of the general GW7 disconnector to make it consistent with the size of the GW7 disconnector used on site and after modification.

[0067] In step 3, according to the specific status of the modified GW17 type disconnector equipment, including whether the mechanism parameters meet the operation requirements, whether the transmission components are damaged, whether the positions of the vertical transmission rods of the main switch and the ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for the transformation, whether the size of the primary conductor meets the lap joint requirements after the transformation, whether the size and bending and torsion resistance of the supporting porcelain bottle meet the technical requirements of the modified GW7 type disconnector, the anti-pollution level of the original porcelain bottle, etc., the mechanism and the static side insulator are reused, and the safety distance requirements from the surrounding live equipment are met after the switch is opened;

[0068] Compared with replacing the entire disconnector set, the calculation in step 4 reduces on-site power outage time and on-site engineering workload. It is based on the equipment operating conditions obtained from the on-site survey and the various technical parameters and structures of the equipment being modified, to determine the number of parts that can be retained, the number of parts that need to be replaced, and the amount of engineering workload that requires modification of the equipment foundation and structure.

[0069] In step 5, the on-site transformation of the original GW17 type disconnector into a GW7 type disconnector mainly includes:

[0070] Step 5.1: Construct the foundation and structure of the original equipment according to the product design structure of the on-site transformation.

[0071] The method of the present invention does not require destruction or modification of the original foundation, and only requires reinforcement, leveling and repair of the foundation;

[0072] Step 5.2: According to the product design structure of the on-site modification, the original equipment supporting porcelain bottle and rotating porcelain bottle are constructed; the position of the vertical transmission rods of the main knife and the ground knife does not change, and the transmission shaft is reused or replaced according to the design plan to achieve the main knife after modification. The angle is 90° and the switch is closed counterclockwise; the ground knife mechanism rotates 90° and closes clockwise.

[0073] Step 5.3: According to the product design structure of the on-site modification, the original equipment main knife and ground knife are constructed. The vertical transmission shaft position of the main knife and ground knife does not change. The transmission shaft is reused or replaced according to the design plan. The main knife rotates 70 degrees and closes counterclockwise; the ground knife mechanism rotates 90 degrees and closes clockwise; Figure 5 As shown, Figure 5 This is a schematic diagram of the closing process for the modified GW7F disconnector. The conductive tube rotates horizontally by 10°; the conductive tube enters the fixed contact at 20°; the intermediate rotating porcelain bottle rotates by 30°; the conductive tube enters the fixed contact at 40°; the shift fork rotates 45° at 50°, causing the conductive tube to flip 60° clockwise; and closing is complete at 60°.

[0074] Step 5.4: Construction of static and moving contacts.

[0075] The static contacts include a left static contact 6 and a right static contact 8 , and the movable contact is a conductive tube movable contact 27 .

[0076] The static contact and the static contact finger 31 are connected by a compression spring 29. The spring compression bolt 30 is connected to the housing of the left static contact 6 and the right static contact 8, and a bolt-fixed compression type is adopted. A closing hook plate 28 is designed on the outside of the static contact. After the conductive tube moving contact 27 completes the closing action, it is tightly and reliably connected to the static contact finger 31. At the same time, the closing hook plate 28 on the outside of the static contact blocks the conductive tube moving contact 27, so that it cannot be dislodged from the static contact under the action of external force, and the switch always remains stable. Figure 7 As shown. The conductive tube turning transmission box is a closed structure, which has the function of preventing rain and dust. Figure 6 shown.

[0077] In step 6, on-site test assessment of the technical parameters of the modified GW7 type disconnector is carried out, mainly including: key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, and operation smoothness of the modified GW7 type disconnector, and assessment of key technical parameters such as the impact force of the fixed insulators at both ends, closing circuit resistance, and equipment current capacity to meet safety regulations and on-site operation requirements.

[0078] The present invention is described in further detail below:

[0079] Step 1: Conduct an on-site survey of the original GW17 disconnector equipment to understand the equipment system's operating mode, operating conditions, meteorological conditions, pollution levels, etc. Investigate the types and causes of faults and defects that occur during operation, and make these the focus of the equipment modification.

[0080] Step 2: Through on-site survey of the modified disconnector and reference to blueprints and other relevant information, a small change is made to the design structure of the general GW7 disconnector to make it consistent with the size of the GW7 disconnector used on site and after modification.

[0081] The key interfaces of the modified equipment are consistent with those of the original equipment, the equipment foundation remains unchanged, the secondary line position remains unchanged, the transmission mechanism position remains unchanged, and the position of some primary leads remains unchanged;

[0082] Step 3: Based on the specific status of the GW17 disconnector equipment being modified, including whether the mechanism parameters meet the operating requirements, whether the transmission components are damaged, whether the vertical transmission rod positions of the main switch and ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for modification, whether the primary conductor size meets the lap joint requirements after modification, whether the supporting porcelain bottle size and bending and torsional resistance meet the technical requirements of the modified GW7 disconnector, and the pollution resistance level of the original porcelain bottle, the mechanism and static side insulators are reused, and the safety distance requirements from surrounding live equipment are met after the switch is opened;

[0083] Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set. This is done by determining the number of components that can be retained, the number of components that need to be replaced, and the amount of engineering work required to modify the equipment foundation and structure based on the equipment operating conditions and various technical parameters and structures of the modified equipment obtained from the on-site survey. Based on the results of the above-mentioned on-site survey, the quantity of main and auxiliary materials required for the modification project is calculated, including the workload of on-site dismantling, installation and commissioning. During a normal modification process, compared to replacing the entire equipment, the budget can be saved by more than 80,000 yuan, and the amount of primary and secondary construction work can be reduced by more than 50%;

[0084] Step 5: On-site conversion of the original GW17 isolating switch to a GW7 isolating switch is achieved by:

[0085] Step 5.1: Based on the product design structure of the on-site modification, construct the original equipment foundation and frame. This technical solution does not require destruction or modification of the original foundation, only reinforcement and leveling repairs are required.

[0086] Step 5.2: Based on the product design structure for on-site modification, install the original equipment's supporting porcelain bottles and rotating porcelain bottles. Determine whether to reuse or replace the supporting porcelain bottles based on the design plan, and install the intermediate rotating porcelain bottles. The porcelain bottle installation height and dimensions are designed according to the pollution level of the substation location.

[0087] Step 5.3: Install the original main and ground cutters according to the product design for the on-site modification. The vertical drive shafts of the main and ground cutters remain unchanged. Reuse or replace the drive rods based on the design. Rotate the main cutter 70° counterclockwise to close; rotate the ground cutter 90° clockwise to close.

[0088] The control connection between the three phases of the disconnector can be mechanically or electrically linked, depending on the equipment's operating mode. Mechanical linkage achieves three-phase linkage through horizontal connecting rods between phases. The addition of positive and negative thread bolts in the connecting rods allows for stepless adjustment, facilitating on-site installation, commissioning, disassembly, and maintenance. Electrical linkage requires a motorized mechanism for each phase, achieving three-phase linkage through electrical control between the three phases.

[0089] The grounding knife adopts a one-step action structure, and the grounding knife contact adopts a self-powered structure. The vertical connecting rod connecting the main grounding knife mechanism to the main body and the horizontal connecting rod connecting the three poles of the grounding knife adopt a splint and clamp connection method. The horizontal connecting rod connecting the three poles of the main knife adopts a positive and negative thread joint connection. Both can achieve stepless adjustment, eliminate the welding and drilling processes, and facilitate the installation, commissioning, disassembly and maintenance of on-site operation and maintenance personnel, and avoid rust caused by welding.

[0090] Step 5.4: Construction of static and moving contacts.

[0091] The static contacts include a left static contact 6 and a right static contact 8 , and the movable contact is a conductive tube movable contact 27 .

[0092] The static contact and the static contact finger 31 are connected by a compression spring 29. The spring compression bolt 30 is connected to the housing of the left static contact 6 and the right static contact 8. The bolt-fixed compression type is adopted, and the pressure block is used instead of the flat washer to make the contact surface force more uniform and the flow more stable. Figure 7 shown.

[0093] A closing hook plate 28 is designed on the outside of the static contact. After the moving contact 27 completes the closing action, it is tightly and reliably connected to the static contact finger 31. At the same time, the closing hook plate 28 on the outside of the static contact locks the moving contact 27, preventing it from coming out of the static contact under abnormal external forces such as strong wind, vibration, and electric power, and the switch always remains stable. The conductive tube 3 flip transmission box is a closed structure with rain and dust protection. Figure 6 As shown;

[0094] Step 6: Conduct on-site test and assessment of the modified GW7 disconnector;

[0095] It mainly includes: assessing the key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, and operation smoothness of the modified GW7 type disconnector, as well as the impact force of the fixed insulators at both ends, closing circuit resistance, equipment current capacity and other key technical parameters to meet safety regulations and on-site operation requirements.

[0096] The present invention provides a GW17 type disconnector modified into a GW7 type disconnector, comprising: an original equipment foundation and frame, a transmission shaft, a main switch, a ground switch, a static contact and a moving contact, wherein:

[0097] The main knife mechanism turns 90° and closes the circuit breaker counterclockwise; the ground knife mechanism turns 90° and closes the circuit breaker clockwise.

[0098] The main switch rotates 70° to close the circuit breaker counterclockwise; the ground switch rotates 90° to close the circuit breaker clockwise.

[0099] The static contacts include a left static contact 6 and a right static contact 8 , and the movable contact is a conductive tube movable contact 27 .

[0100] The static contact and the static contact finger 31 are connected by a compression spring 29. The spring compression bolt 30 is connected to the outer shell of the left static contact 6 and the right static contact 8. The bolt-fixed compression type is adopted. A closing hook plate 28 is provided on the outside of the static contact. After the conductive tube moving contact 27 completes the closing action, it is tightly and reliably connected to the static contact finger 31. At the same time, the closing hook plate 28 on the outside of the static contact blocks the conductive tube moving contact 27.

[0101] The above is a detailed introduction to the method for transforming a GW17 type disconnector into a GW7 type disconnector provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A GW17 type disconnector is converted into a GW7 type disconnector, comprising: The foundation and frame of the original GW17 type disconnector equipment serve as the supporting structure, and the transmission shaft connects the main switch and the ground switch, the static contact and the moving contact. Its characteristics are: the main switch rotates at an angle of 70°, closing the circuit breaker counterclockwise; the ground switch mechanism rotates at an angle of 90°, closing the circuit breaker clockwise; the static contact and the static contact finger are connected by a crimping spring, and the spring crimping bolts are connected to the outer shell of the left static contact and the right static contact, and a bolt-fixed crimping type is adopted. There is a closing hook plate on the outside of the static contact. After the conductive tube moving contact completes the closing action, it is tightly and reliably connected to the static contact finger. At the same time, the closing hook plate on the outside of the static contact blocks the conductive tube moving contact; the static contact includes: left static contact and right static contact, and the moving contact is a conductive tube moving contact.

2. A method for converting a GW17 type disconnector into a GW7 type disconnector, characterized by: The following steps are involved: Step 1: Conduct an on-site survey of the original GW17 type disconnector equipment to determine the key points in equipment modification; Step 2: Through on-site survey of the modified disconnector and review of blueprints, change the product design structure to make it consistent with the on-site application and the dimensions of the modified GW7 disconnector; Step 3: Based on the specific status of the modified GW17 disconnector, reuse the mechanism and static side insulators, and ensure that the safety distance from surrounding live equipment is met after the disconnector is opened. Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set; Step 5: On-site conversion of the original GW17 isolating switch to a GW7 isolating switch; including: Step 5.1: Based on the product design structure of the on-site modification, the foundation and frame of the original GW17 type disconnector equipment are constructed, including foundation reinforcement and leveling repairs; Step 5.2: According to the product design structure of the on-site modification, construct the original equipment support porcelain bottle and rotating porcelain bottle; reuse or replace the drive shaft to meet the modified main knife angle of 70°, counterclockwise closing; ground knife mechanism angle of 90°, clockwise closing; Step 5.3: According to the design structure of the product to be modified on site, install the main cutter and ground cutter of the original equipment; reuse or replace the drive shaft, turn the main cutter 70 degrees and close it counterclockwise; turn the ground cutter mechanism 90 degrees and close it clockwise; Step 5.4: Install the static and moving contacts. The static contacts include a left static contact and a right static contact, and the moving contact is a conductive tube moving contact. The static contacts and static contact fingers are connected by a crimping spring. The spring crimping bolts are connected to the housings of the left and right static contacts, using a bolt-fixed crimping method. A closing hook is installed on the outside of the static contact. After the conductive tube moving contact completes the closing action, it is tightly connected to the static contact finger. At the same time, the closing hook on the outside of the static contact blocks the conductive tube moving contact, preventing it from escaping from the static contact under external force, ensuring that the switch remains stable. Step 6: Conduct on-site test and assessment on the parameters between the contact fingers of the modified GW7 type disconnector.

3. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: The parameters between the contact fingers of the modified GW7 type disconnector include: contact reliability, operation smoothness, impact force on the fixed insulators at both ends, closing circuit resistance and equipment current capacity.

4. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: In step 1, an on-site survey of the original GW17 type disconnector equipment body is conducted to determine the key points in the equipment modification, including understanding the equipment system operation mode, operating conditions, meteorological conditions, and pollution level, investigating the types and causes of faults and defects that occur during operation, and making this the key point to be resolved in the equipment modification.

5. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: In step 2, by conducting on-site inspection of the modified disconnector and consulting blueprint data, the design structure of the universal GW7 disconnector is modified to make it consistent with the size of the GW7 disconnector after on-site application and modification.

6. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: In step 3, based on the specific status of the modified GW17 type disconnector, including whether the mechanism parameters meet the operating requirements, whether the transmission components are damaged, whether the positions of the vertical transmission rods of the main switch and the ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for the modification, whether the primary conductor size meets the lap joint requirements after the modification, whether the size and bending and torsional resistance of the supporting porcelain bottle meet the technical requirements of the modified GW7 type disconnector, and the anti-pollution level of the original porcelain bottle, the mechanism and the static side insulator are reused, and the safety distance requirements from the surrounding live equipment are met after the switch is opened.

7. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: Compared with replacing the entire disconnector set, the calculation in step 4 reduces on-site power outage time and on-site engineering workload. It is based on the equipment operating conditions obtained from the on-site survey and the various technical parameters and structures of the equipment being modified, to determine the number of parts that can be retained, the number of parts that need to be replaced, and the amount of engineering workload that requires modification of the equipment foundation and structure.

8. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: In step 6, the technical parameters of the modified GW7 type disconnector are subjected to on-site testing and assessment, including: key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, operation smoothness, impact force on the fixed insulators at both ends, closing circuit resistance and equipment current capacity, to meet safety regulations and on-site operation requirements.

9. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 2, characterized in that: The method comprises: Step 1: Conduct an on-site survey of the original GW17 disconnector equipment to understand the equipment system's operating mode, operating conditions, meteorological conditions, and pollution levels. Investigate the types and causes of faults and defects that occur during operation, and identify these as key issues to be addressed during equipment modification. Step 2: Through on-site inspection of the modified disconnector and review of relevant blueprint materials, the design structure of the GW7 disconnector is modified to make it consistent with the on-site application and the dimensions of the modified GW7 disconnector; the modified disconnector is consistent with the key interfaces of the original equipment; Step 3: Based on the specific status of the GW17 disconnector equipment being modified, including whether the mechanism parameters meet the operating requirements, whether the transmission components are damaged, whether the vertical transmission rod positions of the main switch and ground switch meet the requirements, whether the equipment frame foundation meets the conditions required for modification, whether the primary conductor size meets the lap joint requirements after modification, whether the supporting porcelain bottle size and bending and torsional resistance meet the technical requirements of the modified GW7 disconnector, and the pollution resistance level of the original porcelain bottle, the mechanism and static side insulators are reused, and the safety distance requirements from surrounding live equipment are met after the switch is opened; Step 4: Calculate the reduction in on-site power outage time and on-site engineering workload compared to replacing the entire disconnector set. Based on the equipment operating conditions obtained from the on-site survey and the technical parameters and structure of the equipment being modified, determine the number of components that can be retained, the number of components that need to be replaced, and the amount of engineering workload required for the equipment foundation and structure modification. Based on the results of the above on-site survey, calculate the quantity of main and auxiliary materials required for the modification project. Step 5: On-site conversion of the original GW17 isolating switch to a GW7 isolating switch is achieved by: Step 5.1: According to the product design structure of the on-site transformation, construct the original disconnector foundation and frame; Step 5.2: Based on the product design structure of the on-site renovation, construct the original equipment's supporting porcelain bottles and rotating porcelain bottles. Decide whether to reuse or replace the supporting porcelain bottles. Install the intermediate rotating porcelain bottles. The installation height and size of the porcelain bottles should be designed according to the pollution level of the substation location. Step 5.3: According to the design structure of the product to be modified on site, install the main cutter and ground cutter of the original equipment; reuse or replace the transmission rod, turn the main cutter 70 degrees counterclockwise to close the switch; turn the ground cutter mechanism 90 degrees clockwise to close the switch; The control connection between the three phases of the disconnector adopts mechanical or electrical linkage. The mechanical linkage method realizes three-phase linkage through the horizontal connecting rod between the phases. The connecting rod is equipped with positive and negative thread bolts to achieve stepless adjustment. The electrical linkage method requires each phase to be equipped with a motor mechanism, and the three-phase linkage is realized through the electrical control between the three phases. Step 5.4: Construction of static and moving contacts; The static contacts include: left static contact and right static contact, and the moving contact is a conductive tube moving contact; The static contact and the static contact finger are connected by a compression spring. The spring compression bolts are connected to the housings of the left and right static contacts. Bolt-fixed compression is adopted, and a pressure block is used instead of a flat washer. A closing hook is provided on the outside of the static contact. After the moving contact completes the closing action, it is tightly connected with the static contact finger. At the same time, the closing hook on the outside of the static contact locks the moving contact, preventing it from coming out of the static contact under external force, and the switch always remains stable. The conductive tube turning transmission box is a closed structure. Step 6: Conduct on-site test assessment on the modified GW7 disconnector; including assessment of the key interface dimensions, phase spacing, dry arc distance, creepage distance, contact reliability between contact fingers, and smooth operation of the modified GW7 disconnector, as well as assessment of the impact force of the fixed insulators at both ends, closing circuit resistance, and current carrying capacity technical parameters of the equipment to meet safety regulations and on-site operation requirements.

10. The method for transforming a GW17 type disconnector into a GW7 type disconnector according to claim 9, characterized in that: The construction of the main knife and ground knife of the original equipment includes: the ground knife adopts a one-step action structure, and the grounding knife contact adopts a self-powered structure; the vertical connecting rod connecting the main ground knife mechanism and the main body and the horizontal connecting rod connecting the three poles of the ground knife adopt a splint and clamp connection method, and the horizontal connecting rod connecting the three levels of the main knife adopts a positive and negative wire joint connection, both of which realize stepless adjustment.

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