Arc extinguishing chamber structure with built-in current transformer for high voltage area and assembling method

Abstract

The application relates to the field of high-voltage switches and discloses an arc-extinguishing chamber structure with a built-in current transformer for a high-voltage area and an assembling method, which comprises a crossbeam and three arc-extinguishing chamber bodies, the three arc-extinguishing chamber bodies are equidistantly arranged above the crossbeam along the length direction of the crossbeam, and the inside of the crossbeam is fixedly provided with horizontal transmission shafts, crank arms and other transmission components corresponding to the arc-extinguishing chamber bodies. The current transformer is integrated with the circuit breaker arc-extinguishing chamber structure, the current transformer is built-in integrated in the circuit breaker support porcelain sleeve, is insulatively arranged in the high-potential area of the lower connection plate depending on the insulating table, and is integrated with the circuit breaker body into a single whole device, thereby replacing the traditional circuit breaker and the independent installation structure of the transformer. The device production manufacturing cost, transportation cost and on-site construction supporting cost are greatly reduced, and the effect of reducing the device cost and adapting to low-end and remote power grid scenes is achieved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, specifically to the structure and assembly method of an arc-extinguishing chamber with a built-in current transformer for high-voltage areas. Background Technology

[0002] High-voltage switches are core control and protection devices in power transmission and distribution systems, widely used in various substations, transmission lines, and distribution scenarios. They are primarily used to achieve normal connection and disconnection of power lines, as well as rapid disconnection protection under fault conditions, effectively ensuring the stability, safety, and reliability of the power grid. Based on their structural form, they can be divided into combined switchgear and open-type AIS equipment. Combined switchgear, with its high integration, small footprint, and strong operational stability, is widely used in mainstream high-voltage and ultra-high-voltage power grid systems. Open-type AIS equipment, on the other hand, has a simpler structure, is easier to maintain, and has greater adaptability, making it more suitable for remote and grassroots power grid construction scenarios.

[0003] High-voltage switches are important control and protection devices in power systems. Combined electrical equipment (AIS) has become a major component of power systems due to its high integration. However, AIS also has its own drawbacks, such as relatively high cost. In many remote and economically underdeveloped areas, open-type (AIS) equipment is widely used. Therefore, porcelain-column circuit breakers, which integrate circuit breakers and instrument transformers, still have a certain market. Moreover, because the cost of integrated products is reduced, this type of product is quite competitive. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an arc-extinguishing chamber structure and assembly method with a built-in current transformer for high-voltage areas, solving the problem of high cost of traditional high-voltage switches.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a structure and assembly method for an arc-extinguishing chamber with a built-in current transformer for high-voltage areas, comprising: a crossbeam and three arc-extinguishing chamber bodies, the three arc-extinguishing chamber bodies being equidistantly installed above the crossbeam along its length. The crossbeam contains fixedly installed horizontal drive shafts, crank arms, and other transmission components corresponding to each arc-extinguishing chamber body. An operating mechanism is fixedly installed on the side of the crossbeam furthest from the arc-extinguishing chamber body. The arc-extinguishing chamber bodies share a single operating mechanism. The output shaft of the operating mechanism is fixedly connected to the horizontal drive shaft inside the crossbeam. The horizontal drive shaft is then connected to the insulating tie rods of each phase via three-phase crank arms. A current transformer is built into each arc-extinguishing chamber body.

[0006] Preferably, an opening / closing indicator is fixedly installed on the side of the crossbeam. The opening / closing indicator is directly linked to the horizontal transmission shaft or the output shaft of the operating mechanism inside the crossbeam. The opening / closing indicator provides the opening / closing position information of the circuit breaker. A density controller is installed on the crossbeam and is connected to the overall SF6 gas chamber of the circuit breaker.

[0007] Preferably, each arc-extinguishing chamber body has an upper wiring plate at its top and a lower wiring plate at its bottom; an arc-extinguishing chamber porcelain sleeve is fixedly installed on the outside of each arc-extinguishing chamber body, with the upper wiring plate fixedly connected to the upper end of the arc-extinguishing chamber porcelain sleeve; a supporting porcelain sleeve is fixedly installed on the outside of the arc-extinguishing chamber body, with the bottom of the supporting porcelain sleeve fixedly connected to the lower wiring plate; a pair of brackets arranged left and right are provided at the bottom of the crossbeam, and the brackets adopt an adjustable height sleeve structure.

[0008] Preferably, the main body of the arc-extinguishing chamber comprises an arc-extinguishing main chamber, a conductive base, an insulating pad, an insulating sleeve, an insulating flange, conductive contacts, a conductive rod, a locking nut, a pressure plate, a support cylinder, a shielding cover, an adjusting block, an adjusting pad, a connector, a lead pipe, an insulating platform, a transmission rod, an insulating pull rod, a connecting nut, a grounding spring, a grounding component, a sealing guide rod, a support plate, a current transformer lead plate, a housing, a current transformer, and a current transformer coil; wherein, the upper end of the housing is fixedly connected to the lower end of the arc-extinguishing chamber porcelain sleeve, and the lower end of the housing is fixedly connected to the upper end of the supporting porcelain sleeve, so that the arc-extinguishing chamber porcelain sleeve and the supporting porcelain sleeve are aligned vertically and connected as one unit to form a closed high-pressure gas chamber.

[0009] Preferably, a high-voltage conductive circuit is provided inside the ceramic bushing of the arc-extinguishing chamber. This circuit is composed of an upper terminal block, an arc-extinguishing main chamber, a conductive base, conductive contacts, and a conductive rod, which are sequentially and fixedly connected from top to bottom. The upper terminal block is fixed to the top of the ceramic bushing of the arc-extinguishing chamber. The lower side of the upper terminal block is connected to the upper stationary contact of the arc-extinguishing main chamber. The lower moving contact of the arc-extinguishing main chamber is connected to the conductive base. Conductive contacts are installed inside the conductive base. The conductive contacts elastically contact the outer wall of the conductive rod. The conductive rod extends downward and is fixedly connected to the lower terminal block.

[0010] Preferably, an insulating sleeve is fitted over the conductive rod, an insulating pad is placed between the conductive rod and the outer shell, and an insulating flange is fitted at the connection point between the conductive rod and the outer shell. The insulating pad, insulating sleeve, and insulating flange together disconnect the conductive circuit between the conductive rod and the outer shell.

[0011] Preferably, an insulating platform is provided on the top of the lower terminal block, and the bottom end of the insulating platform is fixedly installed on the upper surface of the lower terminal block. A support cylinder is vertically provided at the center of the top of the insulating platform, and the lower end of the support cylinder is fixed to the top of the insulating platform. The current transformer is coaxially sleeved outside the support cylinder, and an adjusting pad and an adjusting block are placed between the lower end face of the current transformer and the upper end face of the insulating platform.

[0012] Preferably, a transformer coil is provided on the outer wall of the current transformer, and a shielding cover is fitted on the outer side of the current transformer. The lower end of the shielding cover is snapped into the slot of the insulating platform. A pressure plate is provided above the upper end face of the current transformer. The pressure plate is fitted outside the support cylinder and presses the upper end of the shielding cover. A locking nut is screwed into the external thread of the upper end of the support cylinder. The locking nut presses the pressure plate, and the current transformer, shielding cover, adjusting pad, and adjusting block are fastened into a whole. The shielding cover forms a closed external protective cover.

[0013] Preferably, the current transformer's lead wires extend from its body, sequentially connecting to a connector and passing through a lead tube. The lead tubes are arranged downwards along the outside of the support cylinder. The lower end of the lead tube is fixed by a connecting nut, and a grounding spring elastically abuts against a grounding component. The grounding component is fixed to the inner wall of the support porcelain bushing. The end of the lead tube connects to the transformer lead plate, which is fixed to a support plate by bolts. The support plate is installed on the lower outer side of the support porcelain bushing. The connector, lead tube, connecting nut, grounding spring, grounding component, and transformer lead plate together constitute a continuous protective shield. The grounding spring ensures that the lead tube and the grounding component are elastically fitted. A transmission structure is installed inside the lower part of the support porcelain bushing. The transmission structure includes a transmission rod. The top of the transmission rod is connected to the moving end of the arc-extinguishing main chamber, and the lower end of the transmission rod is fixedly connected to the upper end of an insulating pull rod. The insulating pull rod passes vertically downwards through a sealing guide rod, which is installed at the bottom of the support porcelain bushing.

[0014] This invention also proposes a method for assembling an arc-extinguishing chamber, comprising the following steps:

[0015] S1. First, pre-fix the connector and bolts to the preset installation position of the support cylinder to complete the pre-installation and positioning of the basic accessories;

[0016] S2. Next, place the insulation platform vertically and straighten it. At the same time, stand up multiple sets of current transformer coils vertically in sequence and arrange them neatly according to the assembly standard order.

[0017] S3. Then, place adjustment pads between adjacent current transformer coils in each group to ensure uniform coil spacing and balanced force. At the same time, straighten the current transformer leads corresponding to all current transformer coils, straighten the leads, and make each current transformer lead accurately correspond to the preset lead outlet position on the insulation platform to complete the lead pre-alignment.

[0018] S4. Pass the neatly arranged transformer leads through the inside of the connector to complete the lead limit and fixation; then pass the pre-assembled support cylinder through the insulation platform, transformer coil and adjustment pad from top to bottom. During the assembly process, make precise alignment to ensure that the position of the screw on the outside of the support cylinder corresponds one by one with the position of the slot on the insulation platform.

[0019] S5. Then, the shielding cover is fitted onto the outside of the transformer coil from top to bottom, and the bottom is precisely inserted into the slot of the insulation platform to complete the shielding cover's positioning and fixing.

[0020] S6. Following the top-to-bottom assembly sequence, assemble the adjusting block, pressure plate, and connecting nut one by one to the upper threaded position of the support cylinder, initially positioning and fixing all clamping accessories, and then stand the assembled integrated current transformer unit vertically, placing pads at the bottom of the unit to achieve stable bottom support; at the same time, use the pins of the tooling table to circumferentially limit the current transformer unit.

[0021] S7. Finally, a rotating tool is used to connect the nuts. The rotating tool drives the connecting nuts to tighten at a uniform speed, applying a uniform tightening force to all the upper clamping structures. In the end, the transformer coil, support cylinder, shielding cover, insulation platform and all supporting accessories are clamped and fixed, integrating them into a stable and accurately aligned integrated transformer unit.

[0022] This invention provides a structure and assembly method for an arc-extinguishing chamber with a built-in current transformer for use in high-voltage areas. It offers the following advantages:

[0023] 1. This invention integrates the current transformer and the circuit breaker's arc-extinguishing chamber into a single, unified design. The current transformer is embedded within the circuit breaker's supporting porcelain bushing and insulated on an insulating platform in the high-potential area of ​​the lower terminal block. This integrated design replaces the traditional separate installation structure of the circuit breaker and current transformer. This integrated structure significantly reduces the number of components, the overall size and footprint of the equipment, simplifies on-site assembly, and greatly reduces manufacturing, transportation, and on-site construction costs. It achieves the effect of lowering equipment costs and adapting to low-end and remote power grid scenarios.

[0024] 2. When the closing command is issued, the operating mechanism releases energy and drives the insulating pull rod to rise via the internal transmission component of the crossbeam. This, in turn, drives the conductive rod upwards, closing the moving and stationary contacts in the arc-extinguishing chamber. The high-voltage circuit is then energized from the upper terminal block through the arc-extinguishing main chamber and the conductive rod to the lower terminal block. The transmission component synchronously links the closing / opening indicator to switch the closing position, and the density controller monitors the SF6 gas pressure in the gas chamber in real time. Upon triggering the opening command, the operating mechanism reverses the transmission structure to pull down the conductive rod, separating the moving and stationary contacts and generating an arc. The arc-extinguishing main chamber extinguishes the arc using compressed SF6 gas, disconnecting the primary circuit. The closing / opening indicator then switches to the opening indicator. The entire transmission structure achieves three-phase synchronous closing and opening, with reliable linkage. The closing / opening indicator switches synchronously with the mechanical transmission, facilitating intuitive identification of equipment conditions by maintenance personnel. This achieves the effect of convenient and reliable operation when the device closes. Attached Figure Description

[0025] Figure 1 This is a plan view of the overall device of the present invention;

[0026] Figure 2 This is a side view of the overall device of the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the main body of the arc-extinguishing chamber of the present invention;

[0028] Figure 4 This is a schematic diagram of the current transformer separation in this invention;

[0029] Figure 5 This is a schematic diagram of another installation scheme for the current transformer of the present invention.

[0030] The components include: 1. Crossbeam; 2. Density controller; 3. Operating mechanism; 4. Opening / closing indicator; 5. Upper terminal block; 6. Arc-extinguishing chamber porcelain bushing; 7. Lower terminal block; 8. Supporting porcelain bushing; 9. Bracket; 10. Current transformer; 20. Arc-extinguishing chamber body; 203. Arc-extinguishing main chamber; 204. Conductive base; 205. Insulating pad; 206. Insulating sleeve; 207. Insulating flange; 208. Conductive contact finger; 209. Conductive rod; 210. Locking nut; 211. Pressure... 212. Plate; 213. Support cylinder; 214. Shielding cover; 215. Adjusting block; 216. Adjusting pad; 217. Connector; 218. Lead tube; 229. Insulating platform; 220. Transmission rod; 221. Insulating pull rod; 222. Grounding spring; 225. Grounding component; 226. Sealing guide rod; 227. Support plate; 228. Current transformer lead plate; 229. Housing; 231. Current transformer coil; 31. Pad; 32. Workbench; 33. Rotary fixture. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see the appendix Figure 1 -Appendix Figure 3 This invention provides an arc-extinguishing chamber structure and assembly method with a built-in current transformer for high-voltage areas, including a crossbeam 1 and three arc-extinguishing chamber bodies 20. The arc-extinguishing chamber bodies 20 are arranged in a three-phase discrete manner, and the three arc-extinguishing chamber bodies 20 are equidistantly installed above the crossbeam 1 along the length direction of the crossbeam 1. The crossbeam 1 has a fixedly installed horizontal drive shaft, crank arm, and other transmission components corresponding to each arc-extinguishing chamber body 20. An operating mechanism 3 is fixedly installed on the side of the crossbeam 1 away from the arc-extinguishing chamber body 20. The arc-extinguishing chamber bodies 20 share a common operating mechanism 3. The output shaft of the operating mechanism 3 is fixedly connected to the horizontal drive shaft inside the crossbeam 1. The horizontal drive shaft is then connected to the insulating tie rods 222 of each phase through the three-phase crank arms, so that one power source can drive the three-phase arc-extinguishing chambers to operate synchronously. In use, the arc-extinguishing chambers are operated by the operating mechanism 3. A circuit breaker opening / closing indicator 4 is fixedly installed on the side of the crossbeam 1. The circuit breaker opening / closing indicator 4 is directly linked to the horizontal transmission shaft or the output shaft of the operating mechanism 3 inside the crossbeam 1. The circuit breaker opening / closing indicator 4 provides the circuit breaker opening / closing position information, which is convenient for inspection personnel to observe. A density controller 2 is installed on the crossbeam 1. The density controller 2 is connected to the entire SF6 gas chamber of the circuit breaker and is used to monitor the gas pressure inside the gas chamber in real time and provide pressure status signals.

[0033] refer to Figure 1 , Figure 2 , Figure 3 Preferably, each arc-extinguishing chamber body 20 is provided with an upper wiring plate 5 at its top and a wiring plate 7 at its bottom; an arc-extinguishing chamber porcelain sleeve 6 is fixedly installed on the outside of each arc-extinguishing chamber body 20, the upper end of the arc-extinguishing chamber porcelain sleeve 6 is fixedly connected to the upper wiring plate 5, and a support porcelain sleeve 8 is fixedly installed on the outside of the arc-extinguishing chamber body 20, the bottom of the support porcelain sleeve 8 is fixedly connected to the lower wiring plate 7.

[0034] refer to Figure 1 Preferably, a density controller 2 is provided on the inner side wall of the crossbeam 1. The density controller 2 is directly connected to the circuit breaker gas chamber to monitor and provide the SF6 gas pressure status in the circuit breaker gas chamber in real time.

[0035] refer to Figure 1 , Figure 2 Preferably, the bottom of the crossbeam 1 is provided with a pair of brackets 9 arranged left and right. The brackets 9 adopt an adjustable height sleeve structure, consisting of upper and lower sleeves and fastening bolts. The height of the brackets 9 can be adjusted according to the site conditions, thereby ensuring the insulation safety of the inspection personnel. The upper terminal block 5 and the lower terminal block 7 are reserved with mounting holes, and the specifications, positions and center distance of the mounting holes are consistent, which facilitates the inspection and replacement of the product.

[0036] refer to Figure 1 , Figure 2 , Figure 3 The main body 20 of the arc-extinguishing chamber consists of an arc-extinguishing main chamber 203, a conductive base 204, an insulating pad 205, an insulating sleeve 206, an insulating flange, conductive contacts, a conductive rod 209, a locking nut 210, a pressure plate 211, a support cylinder 212, a shielding cover 213, an adjusting block 214, an adjusting shim 215, a connector 216, a lead pipe 217, an insulating platform 218, a transmission rod 221, an insulating pull rod 222, a connecting nut, a grounding spring 224, and a grounding component. The system comprises 225, 226, 227, 228, 229, 10, and 231, including a sealing guide rod, a support plate, a transformer lead plate, a housing, a current transformer, and a transformer coil. The upper end of the housing 229 is fixedly connected to the lower end of the arc-extinguishing chamber porcelain sleeve 6, and the lower end of the housing 229 is fixedly connected to the upper end of the supporting porcelain sleeve 8, so that the arc-extinguishing chamber porcelain sleeve 6 and the supporting porcelain sleeve 8 are aligned and connected to form a closed high-pressure gas chamber, ensuring the sealing and insulation performance of the internal SF6 gas.

[0037] refer to Figure 3Preferably, the ceramic sleeve 6 of the arc-extinguishing chamber is equipped with a high-voltage conductive circuit. This circuit is composed of an upper terminal block 5, an arc-extinguishing main chamber 203, a conductive base 204, conductive fingers, and a conductive rod 209, which are sequentially and fixedly connected from top to bottom. The upper terminal block 5 is fixed to the top of the ceramic sleeve 6 of the arc-extinguishing chamber. The lower side of the upper terminal block 5 is connected to the upper stationary contact of the arc-extinguishing main chamber 203. The lower moving contact of the arc-extinguishing main chamber 203 is connected to the conductive base 204. The conductive fingers are installed inside the conductive base 204. The conductive fingers elastically contact the outer wall of the conductive rod 209. The conductive rod 209 extends downward and is fixedly connected to the lower terminal block 7. This is used to stably conduct the high voltage and large current of the high-voltage circuit, ensuring reliable conduction of the primary circuit, low contact resistance, and low heat generation.

[0038] refer to Figure 3 Preferably, an insulating sleeve 206 is fitted over the conductive rod 209, an insulating pad 205 is placed between the conductive rod 209 and the outer casing 229, and an insulating flange is fitted at the connection point between the conductive rod 209 and the outer casing 229. The insulating pad 205, the insulating sleeve 206, and the insulating flange together disconnect the conductive circuit between the conductive rod 209 and the outer casing 229, preventing the conductive rod 209, the outer casing 229 and the lower terminal block 7 from forming a stray conductive circuit, preventing the outer casing 229 from becoming energized, creeping, or short-circuiting to ground, and improving the safety of equipment operation.

[0039] refer to Figure 3 , Figure 4 Preferably, an insulating platform 218 is provided on the top of the lower terminal block 7. The bottom end of the insulating platform 218 is fixedly installed on the upper surface of the lower terminal block 7. A support cylinder 212 is vertically provided at the center of the top of the insulating platform 218. The lower end of the support cylinder 212 is fixed to the top of the insulating platform 218. The current transformer 10 is coaxially sleeved on the outside of the support cylinder 212. An adjusting shim 215 and an adjusting block 214 are placed between the lower end face of the current transformer 10 and the upper end face of the insulating platform 218. In use, the overall installation height and level of the current transformer 10 can be adjusted by increasing or decreasing the number of adjusting shims 215 and changing the thickness of the adjusting block 214 to ensure that the transformer is installed coaxially, the force is uniform, and the measurement accuracy is stable.

[0040] refer to Figure 3 , Figure 4Preferably, a transformer coil 231 is provided on the outer wall of the current transformer 10, and a shield 213 is fitted on the outside of the current transformer 10. The lower end of the shield 213 is snapped into the slot of the insulating platform 218. A pressure plate 211 is provided above the upper end face of the current transformer 10. The pressure plate 211 is fitted on the outside of the support cylinder 212 and presses the upper end of the shield 213. The upper end of the support cylinder 212 is screwed with a locking nut 210. The locking nut 210 presses the pressure plate 211, and the current transformer 10, shield 213, adjusting pad 215, and adjusting block 214 are fastened into a whole. The shield 213 forms a closed external protective cover, which effectively shields the high voltage electric field and magnetic field interference, and avoids the high potential environment from affecting the measurement accuracy and stability of the current transformer 10.

[0041] refer to Figure 3 Furthermore, the leads of the current transformer 10 are led out from its body, sequentially connected to connector 216, and passed through lead tube 217. Lead tube 217 is arranged downward along the outside of support cylinder 212. The lower end of lead tube 217 is fixed by connecting nut, and grounding spring 224 elastically abuts against grounding component 225. Grounding component 225 is fixed to the inner wall of support porcelain sleeve 8. The end of lead tube 217 is connected to transformer lead plate 228. Transformer lead plate 228 is fixed to support plate 227 by bolts. Support plate 227 Installed on the lower outer side of the supporting porcelain sleeve 8, the connector 216, lead tube 217, connecting nut, grounding spring 224, grounding component 225, and transformer lead plate 228 together form a continuous protective shielding cover, which shields secondary signals throughout the entire process, ensuring that the measurement signal of the current transformer 10 is stable, interference-free, and reliably transmitted under high voltage conditions; the grounding spring 224 ensures that the lead tube 217 and the grounding component 225 are elastically fitted and reliably grounded, reducing contact resistance and ensuring that the shielding layer is grounded continuously and effectively.

[0042] refer to Figure 3 Preferably, a transmission structure is provided inside the lower part of the supporting porcelain sleeve 8. The transmission structure includes a transmission rod 221. The top end of the transmission rod 221 is connected to the moving end of the arc-extinguishing main chamber 203, and the lower end of the transmission rod 221 is fixedly connected to the upper end of the insulating pull rod 222. The insulating pull rod 222 passes vertically downward through the sealing guide rod 226. The sealing guide rod 226 is installed at the bottom of the supporting porcelain sleeve 8. During operation, the operating mechanism 3 outputs power to drive the insulating pull rod 222 to move up and down. The transmission rod 221 synchronously drives the moving end of the arc-extinguishing main chamber 203 to move, realizing the circuit breaker opening and closing operation. The sealing guide rod 226 provides stable guidance for the insulating pull rod 222 while ensuring dynamic sealing and preventing SF6 leakage, ensuring smooth transmission, no jamming, and reliable synchronous operation.

[0043] When the circuit breaker needs to be closed, the operating mechanism 3 receives the control command and releases the stored energy. Its output shaft drives the horizontal transmission shaft inside the crossbeam 1 to rotate synchronously. The horizontal transmission shaft then drives the insulating pull rods 222 of each phase to move upward through the three-phase crank arms. The insulating pull rods 222 drive the conductive rods 209 to move smoothly upward under the guidance of the conductive contacts via the transmission rods 221, pushing the moving contact and stationary contact of the arc-extinguishing chamber to close. This allows the current to flow through the upper terminal block 5, then into the arc-extinguishing main chamber 203, then into the conductive rods 209, and finally along the conductive contacts to the lower terminal block 7 to form a conductive circuit. At the same time, the horizontal transmission shaft, in conjunction with the opening / closing indicator 4 on the side of the crossbeam 1, switches to the closed position, providing a clear display of the equipment's status. During operation, the density controller 2 monitors the SF6 gas pressure in the arc-extinguishing chamber in real time to ensure stable insulation and sealing performance. When the circuit breaker needs to be tripped, the operating mechanism 3 responds to the tripping command and releases tripping energy. The output shaft rotates in the reverse direction and drives the horizontal transmission shaft inside the crossbeam 1 to rotate in the opposite direction. The three-phase crank arm pulls the insulating rod 222 downward, which drives the conductive rod 209 downward through the transmission rod 221, causing the moving contact to separate from the stationary contact and generate an electric arc. The air cylinder inside the arc-extinguishing main chamber 203 compresses the SF6 gas to form a high-speed airflow to extinguish the electric arc. The main circuit is then disconnected. The horizontal transmission shaft synchronously drives the tripping indicator 4 to switch to the tripping position, completing the tripping operation.

[0044] When the equipment is running, the high-voltage current is introduced into the arc-extinguishing main chamber 203 through the upper terminal block 5, enters the conductive base 204 through the internal contacts of the arc-extinguishing main chamber 203, and then is transmitted to the conductive rod 209 through the conductive contact fingers. The conductive rod 209 then transmits the current to the lower terminal block 7, completing the stable conduction of a high-voltage circuit. The insulating pad 205, insulating sleeve 206 and insulating flange reliably isolate the conductive rod 209 from the outer casing 229, preventing the outer casing 229 from becoming energized and preventing the formation of stray circuits, thus ensuring safe operation. The current transformer 10 is mounted outside the support cylinder 212 and isolated from the high-voltage circuit by the insulating platform 218. It senses the primary circuit current in real time, and its signal is connected to the connector 216 and the lead tube 217 via the lead wire. After being reliably grounded and shielded by the grounding spring 224 and the grounding component 225, it is output to the secondary protection and measurement device by the transformer lead plate 228. The shielding cover 213 shields the high-voltage electric field interference throughout the process, ensuring that the measurement signal is stable and accurate. When it is necessary to open or close the circuit, the operating mechanism 3 outputs power to drive the insulating pull rod 222 to move up and down along the sealing guide rod 226. Through the transmission rod 221, it directly drives the moving end of the arc extinguishing main chamber 203 to move. When closing, the moving and stationary contacts close and the circuit is connected. When opening, the contacts separate and the internal SF6 gas extinguishes the arc, quickly cutting off the current. The sealing guide rod 226 provides guidance for the transmission while ensuring the gas chamber is sealed, so that the opening and closing actions are smooth, synchronous and reliable, realizing the normal switching and protection functions of the circuit breaker.

[0045] Based on the above technical solution, the present invention also provides the working principle of the arc-extinguishing chamber structure and assembly method of the built-in current transformer 10 for high-voltage areas, including the following: This solution integrates the current transformer and the arc-extinguishing chamber structure of the circuit breaker into a single integrated design, and integrates the current transformer 10 inside the circuit breaker support porcelain bushing 8, and installs it insulated in the high-potential area of ​​the lower terminal block 19 by relying on the insulating platform 218, integrating it with the circuit breaker body into a single integrated device, replacing the traditional separate and independent installation structure of the circuit breaker and the transformer.

[0046] This integrated structure abandons the separate installation and independent layout of split equipment, significantly reducing the number of equipment parts, shrinking the overall size and footprint of the equipment, simplifying on-site assembly procedures, and greatly reducing equipment manufacturing costs, transportation costs, and on-site construction and support costs. At the same time, it retains the advantages of open-type porcelain column circuit breakers for use in remote power grids, perfectly solving the industry pain points of high cost of traditional combined electrical appliances, cumbersome matching of conventional AIS split equipment, and high overall cost. It significantly improves the product's market adaptability and core competitiveness, and meets the power grid construction needs of economically underdeveloped and remote areas.

[0047] refer to Figure 5 Another solution includes a workbench 32, with a pad 31 fixedly mounted on the top of the workbench 32. The top of the pad 31 supports the current transformer 10. The top of the support cylinder 212 is fixedly connected to a rotating fixture 33 by bolts. The pad 31 provides low-level support and limit for the current transformer 10, preventing it from rolling or misaligning during assembly and eliminating the need for manual positioning. The workpiece is positioned flat on the workbench 32. With the rotating fixture 33 mounted on the upper end of the support cylinder 212, downward pressure can be applied by rotating the rotating fixture 33 to sequentially complete the clamping assembly of the adjusting pad 215, adjusting block 214, shield 213, pressure plate 211, and locking nut 210. This precisely controls the axial clamping amount of the transformer, unifies the assembly tightening torque, ensures that the coaxiality of the current transformer 10 is consistent with the installation height dimension, reduces manual assembly deviation, and improves batch assembly efficiency and product assembly consistency.

[0048] This invention also proposes a method for assembling an arc-extinguishing chamber, comprising the following steps:

[0049] S1. First, pre-fix the connector 216 and bolts to the preset installation position of the support cylinder 212 to complete the pre-installation and positioning of the basic components, and provide an installation benchmark for subsequent overall assembly.

[0050] S2. Next, place the insulating platform 218 vertically and straighten it. At the same time, stand up multiple sets of current transformer coils 231 vertically in sequence and arrange them neatly according to the assembly standard to ensure that the coils are arranged neatly and the spacing is uniform.

[0051] S3. Then, place adjustment pads 215 between adjacent current transformer coils 231 in each group to ensure uniform coil spacing and balanced force. At the same time, straighten the current transformer leads corresponding to all current transformer coils 231, straighten the leads, and make each current transformer lead accurately correspond to the preset lead outlet position on the insulation platform 218 to complete the lead pre-alignment.

[0052] S4. Pass the neatly arranged transformer leads through the inside of the connector 216 to complete the lead limit and fixation; then pass the pre-assembled support cylinder 212 from top to bottom through the insulating platform 218, the transformer coil 231 and the adjusting pad 215. During the assembly process, ensure precise alignment to ensure that the position of the screw on the outside of the support cylinder 212 corresponds one-to-one with the position of the slot on the insulating platform 218 to avoid misalignment during assembly.

[0053] S5. Then, the shield 213 is fitted onto the outside of the transformer coil 231 from top to bottom. During the assembly process, special attention should be paid to protecting the transformer leads and the outer surface insulation layer of the transformer coil 231 to prevent scratches and damage. Ensure that the shield 213 is fully installed in place and that the bottom is accurately inserted into the slot of the insulating platform 218 to complete the limiting and fixing of the shield 213.

[0054] S6. Following the top-to-bottom assembly sequence, assemble the adjusting block 214, pressure plate 211, and connecting nut one by one to the upper threaded position of the support cylinder 212 to initially position and fix all clamping accessories. Then, stand the assembled integrated current transformer unit vertically and place the pad block 31 at the bottom of the unit to achieve stable bottom support. At the same time, use the pins of the tooling table 32 to circumferentially limit the current transformer unit to prevent the workpiece from rotating or shifting during the assembly process.

[0055] S7. Finally, the rotating tool 33 is used to connect the nuts. The rotating tool 33 drives the connecting nuts to tighten at a uniform speed, applying a uniform tightening force to all the upper clamping structures. Finally, the transformer coil 231, support cylinder 212, shield 213, insulation platform 218 and all supporting accessories are clamped and fixed, and integrated into a stable and accurately aligned integrated transformer unit.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas, characterized in that, include: A crossbeam (1) and three arc-extinguishing chamber bodies (20) are installed at equal intervals above the crossbeam (1) along the length of the crossbeam (1). The crossbeam (1) is fixedly equipped with transmission components such as horizontal drive shafts and crank arms corresponding to each arc-extinguishing chamber body (20). An operating mechanism (3) is fixedly installed on the side of the crossbeam (1) away from the arc-extinguishing chamber body (20). The arc-extinguishing chamber bodies (20) share one operating mechanism (3). The output shaft of the operating mechanism (3) is fixedly connected to the horizontal drive shaft inside the crossbeam (1). The horizontal drive shaft is then connected to the insulating tie rods (222) of each phase through three-phase crank arms. A current transformer (10) is installed inside the arc-extinguishing chamber body (20).

2. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 1 is characterized in that, A circuit breaker opening and closing indicator (4) is fixedly installed on the side of the crossbeam (1). The circuit breaker opening and closing indicator (4) is directly linked to the horizontal transmission shaft or the output shaft of the operating mechanism (3) inside the crossbeam (1). The circuit breaker opening and closing indicator (4) provides circuit breaker opening and closing position information. A density controller (2) is installed on the crossbeam (1). The density controller (2) is connected to the overall SF6 gas chamber of the circuit breaker.

3. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 2, characterized in that, Each arc-extinguishing chamber body (20) is provided with an upper wiring plate (5) at the top and a lower wiring plate (7) at the bottom; an arc-extinguishing chamber porcelain sleeve (6) is fixedly installed on the outside of each arc-extinguishing chamber body (20), and the upper wiring plate (5) is fixedly connected to the upper end of the arc-extinguishing chamber porcelain sleeve (6); a support porcelain sleeve (8) is fixedly installed on the outside of the arc-extinguishing chamber body (20), and the bottom of the support porcelain sleeve (8) is fixedly connected to the lower wiring plate (7); a pair of left and right arranged brackets (9) are provided at the bottom of the crossbeam (1), and the brackets (9) adopt an adjustable height sleeve structure.

4. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 3, characterized in that, The main body (20) of the arc-extinguishing chamber consists of an arc-extinguishing main chamber (203), a conductive base (204), an insulating pad (205), an insulating sleeve (206), an insulating flange, conductive contacts, a conductive rod (209), a locking nut (210), a pressure plate (211), a support cylinder (212), a shielding cover (213), an adjusting block (214), an adjusting pad (215), a connector (216), a lead pipe (217), an insulating platform (218), a transmission rod (221), an insulating pull rod (222), and a connecting nut. The device consists of a grounding spring (224), a grounding component (225), a sealing guide rod (226), a support plate (227), a transformer lead plate (228), a housing (229), a current transformer (10), and a transformer coil (231). The upper end of the housing (229) is fixedly connected to the lower end of the arc-extinguishing chamber porcelain sleeve (6), and the lower end of the housing (229) is fixedly connected to the upper end of the supporting porcelain sleeve (8), so that the arc-extinguishing chamber porcelain sleeve (6) and the supporting porcelain sleeve (8) are aligned and connected to form a closed high-pressure air chamber.

5. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 4 is characterized in that, The arc-extinguishing chamber porcelain sleeve (6) is equipped with a high-voltage conductive circuit. The circuit is composed of an upper terminal block (5), an arc-extinguishing main chamber (203), a conductive seat (204), conductive fingers, and a conductive rod (209) connected in sequence from top to bottom. The upper terminal block (5) is fixed to the top of the arc-extinguishing chamber porcelain sleeve (6). The lower side of the upper terminal block (5) is connected to the upper stationary contact of the arc-extinguishing main chamber (203). The lower moving contact of the arc-extinguishing main chamber (203) is connected to the conductive seat (204). The conductive fingers are installed inside the conductive seat (204). The conductive fingers elastically contact the outer wall of the conductive rod (209). The conductive rod (209) extends downward and is fixedly connected to the lower terminal block (7).

6. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 5 is characterized in that, An insulating sleeve (206) is fitted over the conductive rod (209). An insulating pad (205) is placed between the conductive rod (209) and the outer shell (229). An insulating flange is fitted at the connection point between the conductive rod (209) and the outer shell (229). The insulating pad (205), the insulating sleeve (206), and the insulating flange together disconnect the conductive circuit between the conductive rod (209) and the outer shell (229).

7. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 6 is characterized in that, An insulating platform (218) is provided on the top of the lower terminal block (7). The bottom end of the insulating platform (218) is fixedly installed on the upper surface of the lower terminal block (7). A support cylinder (212) is vertically installed at the center of the top of the insulating platform (218). The lower end of the support cylinder (212) is fixed to the top of the insulating platform (218). The current transformer (10) is coaxially sleeved on the outside of the support cylinder (212). An adjusting pad (215) and an adjusting block (214) are placed between the lower end face of the current transformer (10) and the upper end face of the insulating platform (218).

8. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 7, characterized in that, The outer wall of the current transformer (10) is provided with a transformer coil (231). The outer side of the current transformer (10) is fitted with a shield (213). The lower end of the shield (213) is snapped into the slot of the insulating platform (218). A pressure plate (211) is provided above the upper end of the current transformer (10). The pressure plate (211) is fitted outside the support cylinder (212) and presses the upper end of the shield (213). The upper end of the support cylinder (212) is screwed with a locking nut (210). The locking nut (210) presses the pressure plate (211) to fasten the current transformer (10), shield (213), adjusting pad (215), and adjusting block (214) into a whole. The shield (213) forms a closed external protective cover.

9. The arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas according to claim 8, characterized in that, The lead wire of the current transformer (10) is led out from its body, connected to the connector (216) in sequence, and passed through the lead tube (217). The lead tube (217) is arranged downward along the outside of the support cylinder (212). The lower end of the lead tube (217) is fixed by the connecting nut, and the grounding spring (224) elastically abuts against the grounding component (225). The grounding component (225) is fixed to the inner wall of the support porcelain sleeve (8). The end of the lead tube (217) is connected to the transformer lead plate (228). The transformer lead plate (228) is fixed to the support plate (227) by bolts. The support plate (227) is installed on the lower outside of the support porcelain sleeve (8). The connector (216), lead tube (217), connecting nut, grounding spring (224), grounding component (225), and transformer lead plate (228) together constitute a continuous protective shield. The grounding spring (224) ensures that the lead tube (217) and the grounding component (225) are elastically fitted. A transmission structure is provided inside the lower part of the supporting porcelain sleeve (8). The transmission structure includes a transmission rod (221). The top end of the transmission rod (221) is connected to the moving end of the arc extinguishing main chamber (203). The lower end of the transmission rod (221) is fixedly connected to the upper end of the insulating pull rod (222). The insulating pull rod (222) passes vertically downward through the sealing guide rod (226). The sealing guide rod (226) is installed at the bottom of the supporting porcelain sleeve (8).

10. An arc-extinguishing chamber assembly method, based on the arc-extinguishing chamber structure with a built-in current transformer for high-voltage areas as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. First, fix the connector (216) and bolts in the preset installation position of the support cylinder (212) to complete the pre-installation and positioning of the basic accessories; S2. Next, place the insulation platform (218) vertically and straighten it. At the same time, stand up multiple sets of current transformer coils (231) vertically in sequence and arrange them neatly according to the assembly standard order. S3. Then, place adjustment pads (215) between each group of adjacent transformer coils (231) to ensure uniform coil spacing and balanced force. At the same time, straighten the transformer leads corresponding to all transformer coils (231), straighten the leads, and make each transformer lead accurately correspond to the preset lead outlet position on the insulation platform (218) to complete the lead pre-alignment. S4. Pass the neatly arranged transformer leads through the inside of the connector (216) to complete the lead limit and fixation; then pass the pre-assembled support cylinder (212) through the insulating platform (218), transformer coil (231) and adjusting pad (215) from top to bottom. During the assembly process, ensure that the screw positions on the outside of the support cylinder (212) correspond one-to-one with the slot positions on the insulating platform (218); S5. Then, the shield (213) is fitted from top to bottom onto the outside of the transformer coil (231), and the bottom is precisely inserted into the slot of the insulating platform (218) to complete the limiting and fixing of the shield (213). S6. Following the top-to-bottom assembly sequence, install the adjusting block (214), pressure plate (211), and connecting nut one by one to the upper thread position of the support cylinder (212), initially fix all the clamping parts in place, and then stand the assembled integrated transformer unit upright. Place a pad (31) at the bottom of the unit to achieve stable bottom support; at the same time, use the pins of the tooling table (4) to circumferentially limit the transformer unit. S7. Finally, the (2) rotating tool (33) is used to connect the nuts. The rotating tool (33) drives the connecting nuts to tighten at a uniform speed, and applies a uniform tightening force to all the upper pressing structures. Finally, the transformer coil (231), support cylinder (212), shield (213), insulation platform (218) and all supporting accessories are pressed and fixed, and integrated into an integrated transformer unit with stable structure and accurate alignment.

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