CN121191945A - Transfer branch structures, load switches and ring main units used for vacuum parallel interruption - Google Patents
Transfer branch structures, load switches and ring main units used for vacuum parallel interruptionInfo
- Publication number
- CN121191945A CN121191945A CN202511362397.3A CN202511362397A CN121191945A CN 121191945 A CN121191945 A CN 121191945A CN 202511362397 A CN202511362397 A CN 202511362397A CN 121191945 A CN121191945 A CN 121191945A
- Authority
- CN
- China
- Prior art keywords
- insulating
- rotating plate
- transfer
- pull rod
- parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a transfer branch structure, a load switch and a ring main unit for vacuum parallel connection and disconnection, which relate to the technical field of ring main unit distribution switches and comprise a parallel connection and disconnection arc-extinguishing chamber, a movable end pull rod, a transfer conductor, a fixed insulation shielding body, a guide limiting mechanism and a brake separating and holding and closing auxiliary mechanism, wherein the guide limiting mechanism is connected with the movable end pull rod and an insulation rotating plate so as to convert the rotation motion of the insulation rotating plate into the linear motion of the movable end pull rod, and when the insulation rotating plate rotates to a position enabling the transfer branch structure to be in a brake separating state, the brake separating and closing auxiliary mechanism compresses energy to enable the transfer branch structure to be in the brake separating state, and can release energy to assist brake closing in the process of rotating the insulation rotating plate to a brake closing position, so that the motion stability and reliability of the transfer branch structure are greatly improved, the equipment fault risk is reduced, and the service life of the equipment is prolonged.
Description
Technical Field
The invention relates to the technical field of ring main unit power distribution switches, in particular to a transfer branch structure for vacuum parallel connection and disconnection, a load switch and a ring main unit.
Background
Because the breaking performance of the environment-friendly gas is lower than that of SF6 gas, for a load switch cabinet, an environment-friendly gas insulation and vacuum switching unit technical route is often adopted, and a scheme for connecting a vacuum arc extinguishing chamber with a three-station switch in series or in parallel exists. The series scheme has higher cost due to the additional addition of the vacuum arc-extinguishing chambers, and the typical structure of the current common vacuum parallel connection and disconnection is that the rotary isolation disconnecting link is matched with one vacuum arc-extinguishing chamber and is generally used for the 12kV environment-friendly ring main unit.
The problem existing in the prior art is that for an environment-friendly ring main unit with a higher voltage level (such as 36 kV), the electric field of the typical structure is not friendly, and the risk of weak insulation and easy breakdown exists.
There are a number of drawbacks to the vacuum shunt switch device as disclosed in chinese patent application publication No. CN117612890 a. The movable end of the arc extinguish chamber directly slides in the two driving crank arm sliding grooves through the connecting rod to realize opening and closing operation, the movable end is not provided with guide limit, and in actual action, the opening and closing of the arc extinguish chamber are unreliable due to assembly errors and the like, so that the opening and closing performance of the load switch is seriously affected. The switching-on of the arc extinguishing chamber only depends on self-closing force, and the phenomenon of insufficient switching-on occurs when the service life test is carried out. And this structure is designed to 24kV environmental protection load switch cabinet looped netowrk cabinet, to 36kV environmental protection load switch looped netowrk cabinet, its transfer branch road insulating properties has the risk.
Disclosure of Invention
The invention aims to provide a transfer branch structure, a load switch and a ring main unit for vacuum parallel connection and disconnection, and aims to solve the problems that an existing load switch vacuum parallel connection switch device structure has weak insulation, is easy to break down and is unreliable in opening and closing actions of a parallel branch arc extinguishing chamber for an environment-friendly ring main unit with a voltage level of 36 kV.
In order to achieve the above object, the present invention provides the following solutions:
The invention provides a transfer branch structure for vacuum parallel connection and disconnection, which is arranged in an air box filled with environment-friendly insulating gas and forms a parallel circuit with a main circuit of a load switch, and comprises a parallel connection and disconnection arc extinguishing chamber, a moving end pull rod, a transfer conductor, a fixed insulation shielding body, a guide limiting mechanism and a brake opening and closing auxiliary mechanism, wherein the parallel connection and disconnection arc extinguishing chamber is electrically connected with a main bus of the load switch, the moving end pull rod is connected with a moving end of the parallel connection and disconnection arc extinguishing chamber, the fixed insulation shielding body is fixedly connected with the air box, the transfer conductor is arranged in the fixed insulation shielding body, one end of the transfer conductor is electrically connected with the moving end pull rod, the other end of the transfer conductor is used for transferring current to the parallel circuit when the transfer conductor is communicated with the main circuit, the insulation rotating limiting mechanism is arranged in the fixed insulation shielding body and is connected with the fixed insulation shielding body so as to rotate in the process of opening and closing the main circuit, the guide limiting mechanism is used for connecting the moving end and the moving end pull rod in the rotating direction to the rotating direction of the fixed insulation shielding body in the main circuit, the rotating direction of the rotating insulation shielding body is used for keeping the rotating and closing the rotating position of the rotating insulation shielding body in the parallel connection and closing the parallel connection state, and the rotating insulation shielding body can be kept in the state of the rotating insulation shielding body and the rotating insulation shielding body in the parallel connection and the other end is in the state and the state of the rotating insulation shielding body and the rotating insulation state.
Preferably, the guiding and limiting mechanism comprises a guiding plate, a bearing and a pin shaft, the guiding plate is fixedly connected with the fixed sealing insulation shielding body, a kidney-shaped hole with the same moving direction of the moving end pull rod is formed in the guiding plate, the bearing is installed in the kidney-shaped hole and can move in the length direction of the kidney-shaped hole, the insulation rotating plate is provided with a cam groove, and the pin shaft penetrates through the bearing, the moving end pull rod and the cam groove form a sliding pair, so that the rotary motion of the insulation rotating plate is converted into the linear motion of the moving end pull rod.
Preferably, the cam groove comprises an unequal diameter curve section for driving the moving end pull rod to move and an equal diameter curve section for locking the moving end pull rod when the insulating rotating plate is located at the opening position.
Preferably, the device further comprises a fixing shaft and a transmission shaft, wherein the fixing shaft and the transmission shaft are detachably and fixedly connected with each other through clamping rings, the number of guide plates is two, the number of the guide plates is two, the guide plates are fixedly connected with the fixing shaft, the number of the insulation rotating plates is two, the insulation rotating plates are rotatably connected with the transmission shaft, the transfer conductor is sleeved on the outer side of the transmission shaft and limited through torsion springs, the guide plates are arranged between the two insulation rotating plates, and the transfer conductor is arranged between the guide plates and electrically connected with the movable end of the parallel connection switching-off arc extinguishing chamber through soft connecting pieces.
Preferably, the opening and closing auxiliary mechanism comprises a spring guide rod, a return spring and a spring seat, wherein the spring seat is positioned between the two guide plates, is sleeved on the outer side of the fixed shaft and is rotationally connected with the fixed shaft, one end of the spring seat, which is far away from the fixed shaft, is provided with a sliding hole, one end of the spring guide rod extends into the sliding hole and is slidingly connected with the sliding hole, the other end of the spring guide rod is hinged with the two insulating rotating plates, one end of the return spring is fixedly connected with the spring seat, the other end of the return spring is fixedly connected with one end of the spring guide rod, which is far away from the spring seat, so that when the insulating rotating plates rotate to a position where the branch structure is in an opening state, the branch structure is kept in the opening state by compression energy storage of the return spring, and energy can be released in the process of rotating the insulating rotating plates to the closing position to assist closing.
Preferably, the solid sealed insulation shielding body is formed by compression molding of an epoxy resin material.
The invention also provides a load switch, which comprises an isolation moving contact, an isolation fixed contact and a main bus, and further comprises the transfer branch structure for vacuum parallel connection and disconnection;
The isolating movable contact is fixedly provided with a push plate, and the push plate is provided with a lead-out conductor which can be contacted with or separated from the transfer conductor and a driving part which is used for contacting with the insulating rotating plate according to a preset sequence and driving the insulating rotating plate to rotate.
Preferably, the matching shape of the driving part of the push plate and the insulating rotating plate is configured to follow the action time sequence of firstly enabling the lead-out conductor to be in contact with the transfer conductor to conduct the transfer branch circuit, then enabling the isolation moving contact to be separated from the isolation fixed contact, and then enabling the driving part to push the insulating rotating plate to rotate so as to drive the parallel connection and disconnection arc extinguishing chamber to break.
The invention also provides a ring main unit, the air box of the ring main unit is filled with environment-friendly insulating gas, and the load switch is arranged.
Preferably, the environment-friendly insulating gas is dry air or nitrogen, and rated voltage of the ring main unit is 36kV.
Compared with the prior art, the invention has the following technical effects:
The invention provides a transfer branch structure, a load switch and a ring main unit for vacuum parallel connection and disconnection, key components of the transfer branch structure are integrally installed through a solid sealing insulating shielding body, electric field distribution is effectively optimized, insulating performance at a voltage level of 36kV is improved, the problem of weak insulation caused by structural gaps or air breakdown is avoided, and a guide limiting mechanism accurately converts rotary motion of an insulating rotating plate into linear motion of a movable end pull rod to ensure accurate and reliable movement of a movable end of an arc extinguishing chamber. The brake opening and closing auxiliary mechanism can store energy and keep a brake opening state when the brake is opened, and release energy to assist in closing when the brake is closed, so that the action stability and reliability of the transfer branch structure are greatly improved, the equipment fault risk is reduced, and the equipment operation life is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a transfer branch structure for vacuum parallel connection and disconnection according to the present invention;
FIG. 2 is a cross-sectional view of a transfer leg configuration for vacuum parallel break provided by the present invention;
FIG. 3 is a side view of a transfer arm structure for vacuum parallel switching provided by the present invention in a tripped state;
FIG. 4 is a cross-sectional view of the load switch provided by the invention in a disconnected state;
Fig. 5 is a structural cross-sectional view of the load switch provided by the invention in a closing state;
In the figure, 1, a main bus; 2, pouring parallel buses, 3, connecting rods of fixed contacts, 4, isolating fixed contacts, 5, isolating moving contacts, 6, pushing plates, 7, parallel transfer branches, 71, sealing insulating shielding bodies, 72, fixing shafts, 73, guide plates, 74, spring guide rods, 75, transmission shafts, 76, pin shafts, 77, insulating transfer plates, 771, unequal diameter curve sections, 772, equal arc sections, 78, soft connecting pieces, 79, transfer conductors, 710, bearings, 711, reset springs, 712, spring seats, 8, frames, 9, moving end pull rods and 10, and connecting and disconnecting arc extinguishing chambers in parallel.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a transfer branch structure, a load switch and a ring main unit for vacuum parallel connection and disconnection, and aims to solve the problems that an existing load switch vacuum parallel connection switch device structure has weak insulation, is easy to break down and is unreliable in opening and closing actions of a parallel branch arc extinguishing chamber for an environment-friendly ring main unit with a voltage level of 36 kV.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
The embodiment provides a transfer branch structure for vacuum parallel connection and disconnection, which is arranged in an air box filled with environment-friendly insulating air and forms a parallel circuit with a main circuit of a load switch, and comprises a parallel connection and disconnection arc extinguishing chamber 10, a moving end pull rod 9, a transfer conductor 79, a fixed insulation shielding body 71, a guide limiting mechanism and a brake opening and closing auxiliary mechanism, wherein the parallel connection and disconnection arc extinguishing chamber 10 is electrically connected with a main bus 1 of the load switch, the moving end pull rod 9 is connected with the moving end of the parallel connection and disconnection arc extinguishing chamber 10, the fixed insulation shielding body 71 is fixedly connected with the air box, one end of the transfer conductor 79 is electrically connected with the moving end pull rod 9, the other end of the transfer conductor 79 is used for transferring current to the parallel circuit when being communicated with the main circuit, an insulation rotating plate 77 is arranged in the fixed insulation shielding body 71 and is rotationally connected with the fixed insulation shielding body 71 so as to rotate in the process of opening and closing the main circuit, the guide limiting mechanism is used for connecting the moving end of the moving end pull rod 9 to the fixed insulation shielding body 77 in the process of opening and closing the main circuit, the rotating plate 77 is rotationally connected with the other end of the fixed insulation shielding body 77 so as to enable the other end of the parallel connection and the auxiliary mechanism to be in the state of the linear insulation circuit to be kept in a state of opening and closing. The key components of the transfer branch structure are integrally installed through the solid sealing insulating shield 71, electric field distribution is effectively optimized, insulating performance under 36kV voltage level is improved, the problem of insulation weakness caused by structural gaps or air breakdown is avoided, and the guiding limiting mechanism accurately converts rotary motion of the insulating rotating plate 77 into linear motion of the movable end pull rod 9, so that accuracy and reliability of movement of a movable end of the arc extinguishing chamber are ensured. The brake opening and closing auxiliary mechanism can store energy and keep a brake opening state when the brake is opened, and release energy to assist in closing when the brake is closed, so that the action stability and reliability of the transfer branch structure are greatly improved, the equipment fault risk is reduced, and the equipment operation life is prolonged.
In a preferred scheme of this embodiment, the guiding and limiting mechanism includes the deflector 73, the bearing 710 and the pin 76, the deflector 73 is fixedly connected with the fixed insulation shielding body 71, the kidney-shaped hole with the same moving direction as the moving end pull rod 9 is formed on the deflector 73, the bearing 710 is slidably mounted in the kidney-shaped hole, the insulation rotating plate 77 is provided with the cam groove, the pin 76 passes through the bearing 710, the moving end pull rod 9 and forms a sliding pair with the cam groove, so that the rotary motion of the insulation rotating plate 77 is converted into the linear motion of the moving end pull rod 9, in practical application, when the insulation rotating plate 77 rotates, the contour change of the cam groove drives the bearing 710 to slide in the kidney-shaped hole through the pin 76, and then drives the moving end pull rod 9 to realize the linear motion.
In a preferred scheme of this embodiment, the cam groove includes unequal diameter curve section 771 for driving moving end pull rod 9 to move and equal circular arc section 772 for locking stop end pull rod 9 when insulating rotating plate 77 is located at the opening position, unequal diameter curve section 771 effectively realizes driving of moving end pull rod 9 to move, ensures moving end pull rod 9 to move according to a preset mode in the rotating process of insulating rotating plate 77, and setting of equal circular arc section 772 can form stable locking effect on pin shaft 76 when insulating rotating plate 77 is located at the opening position, avoids accidental displacement of moving end pull rod 9 due to external vibration and other factors in the opening state, and further improves stability of the opening state.
In a preferred scheme of this embodiment, still include fixed axle 72 and transmission shaft 75, fixed axle 72 and transmission shaft 75's both ends pass through the rand with solid sealed insulation shield 71 detachably fixed connection, the quantity of deflector 73 is two, two deflector 73 and fixed axle 72 fixed connection, the quantity of insulating rotating plate 77 is two, two insulating rotating plate 77 and transmission shaft 75 rotate to be connected, transfer conductor 79 cover is established in the outside of transmission shaft 75 and is spacing through the torsional spring, two deflector 73 set up between two insulating rotating plate 77, transfer conductor 79 sets up between two deflector 73, and pass through flexible connection 78 and connect with the movable end electricity of parallelly connected breaking arc extinguishing chamber 10, fixed axle 72 and transmission shaft 75 and the detachable connection mode of solid sealed insulation shield 71, the installation of equipment is convenient, debugging and later maintenance, and maintenance cost is reduced. The arrangement of the double guide plates 73 and the fixed shaft 72, the double insulating rotating plates 77 and the transmission shaft 75, and the reasonable layout of the transfer conductors 79 optimize the current transfer path and the mechanical motion transfer path while ensuring the compact structure, so that the operation of the device is more stable and reliable. The limiting of the torsion spring limits the position of the transfer conductor 79 and the electrical connection mode of the flexible connection member 78, so that the stability and reliability of current transmission in the running process of the equipment are ensured, and the electrical connection fault caused by the displacement of the components is avoided.
In a preferred scheme of this embodiment, the auxiliary mechanism for brake release and closing comprises a spring guide rod 74, a return spring 711 and a spring seat 712, the spring seat 712 is located between the two guide plates 73 and is sleeved on the outer side of the fixed shaft 72 and is rotationally connected with the fixed shaft 72, one end of the spring seat 712, which is far away from the fixed shaft 72, is provided with a sliding hole, one end of the spring guide rod 74 extends into the sliding hole and is slidingly connected with the sliding hole, the other end of the spring guide rod is hinged with the two insulating rotating plates 77, one end of the return spring 711 is fixedly connected with the spring seat 712, the other end of the return spring 711 is fixedly connected with one end of the spring guide rod 74, which is far away from the spring seat 712, so that when the insulating rotating plates 77 rotate to a position where a parallel circuit is in a brake release state, the return spring 711 compresses and stores energy to enable the parallel circuit to keep the brake release state, and can release energy to assist the brake closing in the process of rotating the insulating rotating plates 77 to the brake release position, the acting force of the return spring 711 and the fixed shaft 72 can be adaptively adjusted along with the rotation angle of the insulating rotating plates 77, the spring guide rod 74 in the sliding hole is guided by compression and release of the return spring guide rod 74 in the return spring in the sliding process.
In a preferred embodiment of the present embodiment, when the isolating moving contact 5 moves until the arc extinguishing chamber reaches the theoretical design opening distance, and the opening is in place, the spring guide rod 74 is clamped on the supporting shaft of the insulating rotating plate 77, and the return spring 711 is in a compressed state. This compressed state has a certain elastic potential energy and can generate a force for maintaining the current position, which hinders the accidental movement of the moving end pull rod 9 of the arc extinguishing chamber and the related components. When no additional external force overcomes the acting force in the compression state, the stability of the whole device after opening the brake can be effectively maintained, the arc extinguishing chamber is ensured not to be accidentally closed after opening the brake due to external force interference and other unexpected factors, thereby accurately keeping the opening state and ensuring the accuracy and stability of the running state of the device. During closing, when the insulating rotary plate 77 is rotated toward the closing position, the spring guide 74 connected thereto is also rotated. At this time, the return spring 711 is in a compressed state and stores energy, along with the rotation of the spring guide rod 74, after one end of the spring guide rod 74 hinged with the insulation rotating plate 77 passes through the connecting line position between the fixed shaft 72 and the transmission shaft 75 (at this time, the compression amount of the return spring 711 is maximum), the return spring 711 starts to release pressure, the stored elastic potential energy is converted into kinetic energy, acts on a component connected with the spring guide rod 74 and is further transferred to the moving end pull rod 9 of the arc-extinguishing chamber, the closing of the arc-extinguishing chamber is assisted, the condition that a loop is not opened due to the fact that the self-closing force of the arc-extinguishing chamber is not closed in place is effectively avoided, the arc-extinguishing chamber can be closed in place smoothly, the circuit conduction is completed, and the device function is realized.
In a preferred scheme of the embodiment, the solid sealed insulation shielding body 71 is formed by compression molding of an epoxy resin material, the solid sealed insulation shielding body 71 formed by compression molding of the epoxy resin material has good insulation performance, mechanical performance and chemical corrosion resistance, reliable insulation protection can be provided, the transfer branch structure is ensured not to be interfered by external electricity, external mechanical impact and chemical corrosion can be born to a certain extent, the service life of equipment is prolonged, the insulation failure risk of the equipment is reduced, and the overall reliability and stability of the equipment are improved.
Example two
The embodiment also provides a load switch, which comprises an isolation moving contact 5, an isolation fixed contact 4, a fixed contact connecting rod 3, a main bus 1, a parallel bus pouring 2 and a frame 8, wherein the main bus 1 is electrically connected with the isolation fixed contact 4 through the parallel bus pouring 2, and the load switch further comprises a transfer branch structure for vacuum parallel connection and disconnection, wherein the transfer branch structure for vacuum parallel connection and disconnection is arranged on the frame 8;
The isolating movable contact 5 is fixedly provided with a push plate 6, the push plate 6 is provided with a lead-out conductor which can be contacted with or separated from a transfer conductor 79 and a driving part which is used for being contacted with the insulating rotary plate 77 according to a preset sequence and driving the insulating rotary plate to rotate, the load switch integrates the transfer branch structure, the main bus 1 is connected with the parallel breaking arc extinguishing chamber 10 through the parallel bus pouring 2, and the integration of the air and vacuum parallel breaking functions is realized. The design of the push plate 6 on the isolation moving contact 5 can accurately control the on-off time sequence of the transfer branch, the lead-out conductor is used for smoothly realizing the on-off of current in the transfer branch, and the driving part drives the insulation rotating plate 77 to rotate according to a preset sequence, so that the switching-on and switching-off operation of the device is strictly completed according to the preset sequence, the accuracy and the reliability of the load switch operation are improved, and the operation requirements under different working conditions are met.
In a preferred scheme of the embodiment, the matching shape of the driving part of the push plate 6 and the insulating rotating plate 77 is configured to follow the action time sequence of firstly enabling the leading conductor to contact with the transfer conductor 79 to conduct the transfer branch and then enabling the isolating movable contact 5 to separate from the isolating fixed contact 4 in the opening process, and then the driving part pushes the insulating rotating plate 77 to rotate so as to drive the parallel connection and disconnection of the arc extinguishing chamber 10 to open, so that the design of the matching shape ensures that all action links in the opening process are carried out according to strict preset time sequence. The transfer branch circuit is conducted firstly, so that stable transfer of current can be realized, damage to equipment caused by excessive current in the moment is avoided, then the main contact is separated, then the arc extinguishing chamber is opened, safety, reliability and order of opening operation are ensured, the possibility of faults such as arc reignition and insulation breakdown in the opening process is effectively reduced, and the safety and stability of equipment operation are improved.
The invention also provides a ring main unit, the air box of the ring main unit is filled with environment-friendly insulating gas, and the load switch is arranged.
In a preferred scheme of the embodiment, the environment-friendly insulating gas is dry air or nitrogen, the rated voltage of the ring main unit is 36kV, and the dry air or nitrogen is used as the environment-friendly insulating gas, so that the environment-friendly insulating gas meets the environment-friendly requirement and can provide a good insulating environment for equipment at the rated voltage of 36 kV. The whole ring main unit integrates the load switch, so that the ring main unit has a safe and reliable air and vacuum parallel connection and disconnection function, can adapt to the power distribution requirement of 36kV voltage level, effectively improves the operation reliability, safety and stability of the ring main unit under the voltage level, reduces the power failure accidents caused by electric faults, and improves the power supply quality and reliability.
The invention relates to a transfer branch structure for parallel connection and disconnection of air and vacuum, which essentially comprises the following steps of realizing opening and closing operation and completing parallel connection and disconnection of air and vacuum in a ring main unit:
Parallel connection breaking and separating brake process
When the load switch is at the closing position, when the isolation moving contact 5 moves to a certain distance along the set stroke, the lead-out conductor on the push plate 6 is contacted with the transfer conductor 79, and the parallel transfer branch 7 is conducted. At this time, the moving contact and the fixed contact are not separated, the main contact is still switched on, and partial current of the main circuit is diverted to the parallel transfer branch 7, so that partial current distribution is realized. The step provides for smooth transition of current in the subsequent opening process, and effectively avoids impact of instantaneous current mutation on equipment.
The main contact opening preparation, namely the isolation movable contact 5 continuously moves downwards to the just-opened position, the transfer branch is continuously connected, all current passes through the parallel branch, the potential between the movable contact and the fixed contact is approximately equal, the pressure difference is extremely small, the occurrence of the phenomenon of arc starting due to instantaneous breakdown of contact separation is avoided, and a safe and stable condition is created for the opening of the subsequent arc extinguishing chamber.
And the switching-off action of the arc-extinguishing chamber, namely, the isolating moving contact 5 continues to act, the push plate 6 contacts with the insulating rotary plate 77 and pushes the insulating rotary plate 77 to rotate, and the insulating rotary plate 77 drives the moving end pull rod 9 of the arc-extinguishing chamber to act so as to drive the switching-off of the arc-extinguishing chamber. Because the dynamic end pull rod 9 of the arc-extinguishing chamber is fixed on the pin shaft 76, the pin shaft 76 is guided by the deep groove ball bearings 710 at the two ends, the guiding and limiting mechanism ensures the guiding accuracy of the dynamic ends of the arc-extinguishing chambers 10 which are connected in parallel and is disconnected, the reliability and stability of the brake-separating action of the arc-extinguishing chambers are improved, and the brake-separating failure of the arc-extinguishing chambers caused by factors such as assembly errors and the like is avoided.
And the arc transfer, namely when the isolation moving contact 5 moves to the state of just separating the arc extinguishing chamber, the isolation fracture distance is far greater than the opening distance of the arc extinguishing chamber, and the generated arc is transferred in the arc extinguishing chamber. The process ensures that the electric arc is effectively treated in the arc extinguishing chamber, prevents the electric arc from damaging equipment insulation and the like, and further ensures the operation safety of the equipment.
The opening is in place and kept, namely the isolation moving contact 5 continues to move until the arc extinguishing chamber reaches the theoretical design opening distance, and the opening is in place. At this time, the spring guide 74 is caught on the support shaft of the insulating rotary plate 77, and the return spring 711 is in a compressed state. The compressed state stores elastic potential energy, and the generated acting force can keep the current position to prevent the movable end pull rod 9 of the arc extinguishing chamber and related components from moving accidentally. When no extra external force overcomes the acting force, the stability of the device after opening the brake can be maintained, the arc extinguishing chamber is ensured not to be accidentally closed due to the interference of the external force, and the accuracy and the stability of the opening state are maintained.
Parallel switching-on/off process
When the load switch is at the opening position, the pin shaft 76 is positioned at the arc initial section such as the cam groove of the insulating rotating plate 77. The isolating movable contact 5 is driven to move upwards through the transmission crank arm, when the isolating movable contact moves to a certain extent, the lead-out conductor on the push plate 6 is contacted with the transfer conductor 79, the transfer branch is conducted, and the parallel connection breaking arc extinguishing chamber 10 and the isolating movable contact 5 are still in a breaking position. The step lays a foundation for the connection of a follow-up arc-extinguishing chamber closing recovery circuit.
And the switching-on of the arc extinguishing chamber is started, namely the isolation movable contact 5 continues to move upwards, the push plate 6 drives the insulation rotary plate 77 to act, and then the parallel connection switching-on and switching-off of the vacuum arc extinguishing chamber is started. In the process, all the components act cooperatively, so that the closing action of the arc extinguishing chamber is ensured to be started stably.
Gradually closing the switch until the switch is in place, namely when the isolation movable contact 5 is contacted with the isolation fixed contact 4, the parallel connection and disconnection vacuum arc extinguishing chamber movable end pin shaft 76 is not closed temporarily in the equal arc section 772 of the insulation rotating plate 77. Along with the continuous action of the isolating moving contact 5, the push plate 6 drives the insulating rotating plate 77 to rotate continuously until the pin shaft 76 in the insulating rotating plate 77 moves to the over-dead-point position along the equal-arc section 772. At this time, the spring guide rod 74 rotates along with the insulating rotating plate 77, the reset spring 711 releases pressure, elastic potential energy is converted into kinetic energy, the kinetic energy acts on a component connected with the spring guide rod and is transmitted to the moving end pull rod 9 of the arc extinguishing chamber, the arc extinguishing chamber is assisted to be switched on, the condition that a loop is not opened because the single self-closing force of the arc extinguishing chamber is not closed in place is avoided, the arc extinguishing chamber is ensured to be switched on in place, the switching-on process is completed, the circuit is recovered to be conducted, and the normal operation of equipment is ensured.
In the whole switching-on and switching-off use process, through the sequential driving structure with the epoxy resin shielding, the switching-on and switching-off of the load switch is strictly ensured to follow the standard time sequence of current transfer, switching-off of the main contact, switching-off of the arc extinguishing chamber, switching-off of the parallel branch and isolation of the main fracture, the insulation requirement of 36kV voltage class under the dry air insulation condition is met, and the safe and reliable operation of equipment under the specified voltage class is ensured. The parallel arc-extinguishing chamber moving end guide structure and the opening and closing retaining structure cooperatively play a role, so that the reliable action of the arc-extinguishing chamber is ensured, faults in the opening and closing process are avoided, the reliability and stability of the integral operation of the equipment are obviously improved, and the requirement of the preset design performance is completely met.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present invention and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511362397.3A CN121191945A (en) | 2025-09-23 | 2025-09-23 | Transfer branch structures, load switches and ring main units used for vacuum parallel interruption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511362397.3A CN121191945A (en) | 2025-09-23 | 2025-09-23 | Transfer branch structures, load switches and ring main units used for vacuum parallel interruption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN121191945A true CN121191945A (en) | 2025-12-23 |
Family
ID=98081219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202511362397.3A Pending CN121191945A (en) | 2025-09-23 | 2025-09-23 | Transfer branch structures, load switches and ring main units used for vacuum parallel interruption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN121191945A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121439597A (en) * | 2025-12-31 | 2026-01-30 | 博海机电科技集团有限公司 | A load switch |
-
2025
- 2025-09-23 CN CN202511362397.3A patent/CN121191945A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121439597A (en) * | 2025-12-31 | 2026-01-30 | 博海机电科技集团有限公司 | A load switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018086456A1 (en) | Double-break isolating switch having grounding linkage | |
| CA2069690A1 (en) | Medium voltage circuit breaker with reduced operating energy | |
| CN121191945A (en) | Transfer branch structures, load switches and ring main units used for vacuum parallel interruption | |
| CN1290137C (en) | Low-voltage circuit breaker | |
| CN115602480B (en) | Three-position switch and three-position environment-friendly gas combined electrical appliance ring main unit | |
| CN113035636A (en) | Switchgear and distribution equipment | |
| RU2418335C1 (en) | Vacuum circuit breaker | |
| CN115663672B (en) | Upper-lower double-isolation air insulation switch cabinet | |
| CN108493036B (en) | C-GIS high-voltage alternating current breaker | |
| CN209169042U (en) | A kind of switch spindle transmission device | |
| CN222883436U (en) | Outdoor pole-mounted circuit breaker with secondary fusion | |
| CN211957535U (en) | Transmission mechanism of side-mounted circuit breaker | |
| CN222233548U (en) | A circuit breaker | |
| CN110233082B (en) | Permanent magnet vacuum circuit breaker and inflatable cabinet | |
| JP2025536025A (en) | Switchgear operating mechanism | |
| CN215009272U (en) | General type quick arc extinguisher that can move open | |
| CN120183974A (en) | A circuit breaker | |
| CN108717915B (en) | High-voltage circuit breaker system with suitable plateau environment performance | |
| JP4714527B2 (en) | High voltage high capacity circuit breaker | |
| CN110544597B (en) | Auxiliary arc extinguishing device for 800kV external grounding switch and use method | |
| CN210778385U (en) | Load switch-fuse combined electrical apparatus | |
| CN111477495A (en) | Isolation integrated switch of air insulation circuit breaker | |
| CN112103126A (en) | High-voltage circuit breaker for high-speed railway | |
| CN222168243U (en) | A vacuum load isolating switch | |
| CN120432335B (en) | An electric operating device for high-voltage isolating switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |