CN114783824A - Single-coil electromagnetic repulsion mechanism for rapid vacuum switch and working method - Google Patents
Single-coil electromagnetic repulsion mechanism for rapid vacuum switch and working method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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Abstract
The invention discloses a single-coil electromagnetic repulsion mechanism for a rapid vacuum switch and a working method thereof. On one hand, the invention can realize the on-off operation of the rapid vacuum switch by adopting the single coil structure, can fill the technical blank of the electromagnetic repulsion mechanism for the rapid vacuum switch, reduce the manufacturing cost of the rapid vacuum switch and is beneficial to the popularization and the application of the rapid vacuum switch; on the other hand, when the switching-on and switching-off operations of the rapid vacuum switch are close to the switching-on or switching-off positions, the continuous discharge current in the coil casting body can induce and generate a magnetic field with the direction opposite to that of the magnetic field of the coil casting body in the switching-off eddy current plate or the switching-on eddy current plate in the movement direction of the discharge current, damping buffer acting force is provided for the switching-on movement or the switching-off movement respectively, and the mechanical reliability of the switching-on and switching-off operations of the rapid vacuum switch is remarkably improved.
Description
Technical Field
The invention relates to a technology of a quick vacuum switch electromagnetic repulsion mechanism, in particular to a single-coil electromagnetic repulsion mechanism for a quick vacuum switch and a working method.
Background
Compared with a switch and power electronic switch equipment which are driven by an operating mechanism such as a traditional permanent magnet, a spring and the like, the quick vacuum switch driven by the electromagnetic repulsion mechanism has the remarkable characteristics of short switching-on and switching-off time, low dispersibility, economy, environmental protection and the like, can realize accurate phase-controlled switching of capacitive or inductive loads, reduce electromagnetic transient impact caused by switching operation of a system, realize quick cutting-off or isolation of short-circuit faults of a power transmission and distribution system, reduce dynamic and thermal stable impact of short-circuit current on other power equipment such as a transformer and the like, improve the safety and stability of system operation, accelerate the quick interaction of a novel power system source, a network and a load of a high-proportion new energy source access and a novel high-proportion power electronic load, and is an important direction for the development of an environment-friendly high-voltage switch technology under the aim of double carbon.
The existing phase is applied to the fast vacuum switch in the technical fields of direct current circuit breakers, fault current limiters, controllable series compensation, standby power switching, arc extinction and harmonic elimination, and the like, a typical coil-coil or coil-repulsion plate type double-coil electromagnetic repulsion mechanism is generally adopted, and the fast opening and closing operation of the switch is realized under the action of electromagnetic repulsion between coils or between the coils and the repulsion plate. Compared with a traditional permanent magnet or spring operating mechanism for the vacuum switch, the electromagnetic repulsion mechanism with the double-coil structure is limited by the manufacturing process and technology of the coil body, the manufacturing cost is high, the operation reliability is low, and the popularization and the application of the rapid vacuum switch are seriously restricted. By adopting the electromagnetic repulsion mechanism with the single coil structure and the optimized design of the coil transmission structure, the closing and opening characteristics which are the same as those of the electromagnetic repulsion mechanism with the double coil structure can be realized, and meanwhile, the manufacturing cost of the rapid vacuum switch can be reduced on the premise of meeting the same reliability operation requirement, thereby being beneficial to the popularization and the application of the rapid vacuum switch. However, the current research reports related to the fast vacuum switch based on the single coil type electromagnetic repulsion mechanism still remain blank.
In addition, due to the high switching-on and switching-off speed of the rapid vacuum switch, the high impact stress of the rapid vacuum switch in the switching-on and switching-off operation process is an important factor for restricting the improvement of the mechanical reliability of the rapid vacuum switch. At present, technologies such as spring buffering, hydraulic buffering, gas buffering, electromagnetic buffering, high polymer material polyurethane buffering and the like are mostly adopted for the buffering of switching on and switching off operations. Oil buffer technology and high polymer material polyurethane need to arrange an oil buffer on a transmission part of the rapid vacuum switch, which inevitably increases the switch volume; the invention patent ZL 201911296578.5 discloses a gas buffer structure and a technical method, which integrates the gas buffer function into the electromagnetic repulsion mechanism body, can obviously reduce the volume of the rapid vacuum switch, and provides higher requirements for the sealing design of the electromagnetic repulsion mechanism body; the electromagnetic buffering technology realizes the buffering damping characteristic by controlling the discharging current of a closing coil or an opening coil on the premise of not changing a body mechanism of the electromagnetic repulsion mechanism, but the complexity of a control loop and a control strategy of the electromagnetic repulsion mechanism cannot be avoided.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a single-coil electromagnetic repulsion mechanism for a quick vacuum switch and a working method thereof, on one hand, the invention fills the technical blank of the electromagnetic repulsion mechanism for the quick vacuum switch, reduces the manufacturing cost of the quick vacuum switch and is beneficial to the popularization and the application of the quick vacuum switch; on the other hand, the mechanical reliability of the switching on/off operation of the rapid vacuum switch is obviously improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single-coil electromagnetic repulsion mechanism for a rapid vacuum switch comprises a switching-off vortex plate component, a coil casting body, a switching-on vortex plate component, a coil motion component and an insulation support sleeve; the coil casting body is distributed on the outer periphery of the coil motion assembly and positioned between the brake separating vortex plate assembly and the brake closing vortex plate assembly; the insulation support sleeve is positioned between the opening eddy current plate component and the closing eddy current plate component and positioned outside the coil casting body;
the brake separating vortex plate assembly comprises a brake separating vortex plate and a brake separating guide ring, and the brake separating vortex plate is fixedly connected with the brake separating guide ring to limit the movement freedom of the coil movement assembly to axial movement;
the coil casting body comprises a coil, an insulating casting material and a metal insert which are sequentially connected;
the switching-on vortex plate assembly comprises a switching-on vortex plate and a switching-on guide ring, the switching-on vortex plate is fixedly connected with the switching-on guide ring, and the motion freedom degree of the coil motion assembly is limited to axial motion;
the coil movement assembly comprises a transmission rod, a fastening nut, a first fastening guide sleeve, a first gasket, a second gasket and a second fastening guide sleeve;
the metal insert of the coil casting body is fixedly pressed by a fastening nut through a first fastening guide sleeve and a second fastening guide sleeve and is fixedly connected with the transmission rod; and a first gasket is arranged between the first fastening guide sleeve and the coil casting body, and a second gasket is arranged between the second fastening guide sleeve and the coil casting body so as to reduce the impact stress of the switching-on and switching-off operation of the rapid vacuum switch on the coil casting body.
When the rapid vacuum switch is switched on, a switching-on discharge current flows through a coil to generate an axial magnetic field, an eddy current electromagnetic field opposite to the direction of the coil magnetic field is induced and generated in a switching-on eddy current plate, and meanwhile, electromagnetic repulsion is generated between the coil and the switching-on eddy current plate; under the action of the electromagnetic repulsion force, the coil casting body drives the coil motion assembly, the switching-on and switching-off holding device, the insulating pull rod, the contact spring and the vacuum arc-extinguishing chamber movable conducting rod to perform switching-on operation; when the rapid vacuum switch is switched on and is close to a switching-on position, the continuous discharge current in the coil induces and generates an eddy reverse magnetic field in the switching-off eddy current plate and generates a damping buffer effect on the switching-on motion of the coil casting body and the coil motion assembly;
when the rapid vacuum switch is operated in a brake-separating mode, brake-separating discharge current flows in the coil to generate an axial magnetic field, an eddy current electromagnetic field opposite to the direction of the coil is induced in the brake-separating eddy current plate, and meanwhile electromagnetic repulsion force is generated between the coil and the brake-separating eddy current plate; under the action of the electromagnetic repulsion force, the coil casting body drives the coil motion assembly, the switching-on and switching-off holding device, the insulating pull rod, the contact spring and the movable conducting rod of the vacuum arc extinguish chamber to perform switching-off operation; when the opening operation is close to the opening position, the coil induces an eddy reverse magnetic field in the closing eddy current plate, and generates a damping buffer effect for the opening movement of the coil pouring body and the coil movement assembly; the damping buffer characteristic can obviously improve the mechanical reliability of the opening and closing operation of the single-coil electromagnetic repulsion mechanism.
When the rapid vacuum switch is in a switching-on position, an air gap with a certain length is reserved between the coil casting body and the switching-off vortex plate to prevent the coil casting body and the switching-off vortex plate from directly colliding in the switching-on operation process of the rapid switch; the gap is realized by the limit matching of the middle groove of the brake-separating vortex plate and the outer boss of the first fastening guide sleeve; when the rapid vacuum switch is at a switching-off position, an air gap with a certain length is reserved between the coil casting body and the switching-on vortex plate to prevent the coil casting body and the switching-on vortex plate from directly colliding in the switching-off operation process of the rapid switch, and the gap is realized by limiting and matching the middle groove of the switching-on vortex plate and the outer boss of the second fastening guide sleeve.
The switching-off eddy current plate and the switching-on eddy current plate are made of non-ferromagnetic metal materials such as high-conductivity aluminum alloy or copper and the like; the opening guide ring and the closing guide ring are made of brass materials.
The coil is wound into a single-layer, double-layer or multi-layer coil structure by adopting a flat copper wire or an aluminum wire; for a single-layer coil structure, folding the inlet and outlet wires at the inner side of the wound coil to the outer side, and then casting to ensure that the inlet and outlet wires of the coil casting body are arranged on the cylindrical surface at the outer side of the coil; for a double-layer or multi-layer coil structure, the winding directions of all layers are required to be ensured to be the same so as to improve the driving efficiency of the electromagnetic repulsion mechanism, and the incoming and outgoing lines of the coil casting body are required to be arranged on the outer side cylindrical surface of the coil.
The insulating casting material is prepared by adopting an SMC high-temperature compression molding process, or an epoxy resin vacuum casting process, or a glass fiber reinforced epoxy casting process.
The metal insert adopts a slotted structure to prevent the coil from generating induced eddy current in the metal insert when being electrified, and the driving efficiency of the single-coil electromagnetic repulsion mechanism is improved.
The insulating support sleeve is provided with an observation window for observing the switching-on or switching-off state of the coil pouring body.
Compared with the prior art, the invention has the following beneficial effects:
compared with the typical coil-coil or coil-repulsion disc-type double-coil electromagnetic repulsion mechanism which is commonly adopted by the rapid vacuum switch in the prior stage, the single-coil electromagnetic magnetic force mechanism provided by the invention can realize the switching-on and switching-off operation of the rapid vacuum switch by adopting the single-coil structure, fills the technical blank of the electromagnetic repulsion mechanism for the rapid vacuum switch, reduces the manufacturing cost of the rapid vacuum switch and is beneficial to the popularization and application of the rapid vacuum switch; on the other hand, when the on-off operation of the rapid vacuum switch is close to the on-off position or the off-off position, the single-coil electromagnetic repulsion mechanism can provide damping buffering acting force for the on-off movement of the electromagnetic repulsion mechanism through the discharging current continued in the coil, and the mechanical reliability of the on-off operation of the rapid vacuum switch is obviously improved.
Drawings
Fig. 1 is a structural view of a fast vacuum switch using the single-coil electromagnetic repulsion mechanism of the present invention.
Fig. 2 is a cross-sectional view of a three-dimensional structure of a single-coil electromagnetic repulsion mechanism for a rapid vacuum switch according to the present invention.
Fig. 3 is a three-dimensional exploded view of a single-coil electromagnetic repulsion mechanism for a rapid vacuum switch according to the present invention.
Fig. 4a is a schematic structural view of a metal insert of a single-coil electromagnetic repulsion mechanism according to the present invention, and fig. 4b is a sectional view taken along a direction a-a in fig. 4 a.
Fig. 5a is a front view of a single-coil electromagnetic repulsion mechanism single-layer coil structure according to the present invention, and fig. 5b is a top view of the single-coil electromagnetic repulsion mechanism single-layer coil structure according to the present invention.
Fig. 6a and fig. 6b are schematic diagrams of the double-layer and multi-layer coil structures of the single-coil electromagnetic repulsion mechanism according to the present invention, respectively.
Fig. 7a is a three-dimensional structural view of the single-coil electromagnetic repulsion mechanism insulating support sleeve according to the present invention, and fig. 7b is a sectional view taken along the direction a-a in fig. 7 a.
Fig. 8a is a diagram of a conventional coil-coil type quick-opening and closing electromagnetic repulsion mechanism, fig. 8b is a diagram of a conventional coil-repulsion disk type quick-opening and closing electromagnetic repulsion mechanism, and fig. 8c is a diagram of a single-coil type electromagnetic repulsion mechanism according to the present invention.
Detailed Description
The following takes an electromagnetic repulsion mechanism for a 40.5kV rapid vacuum switch as an example, and the invention is further described in detail by combining the attached drawings and the specific embodiments:
as shown in fig. 1, the 40.5kV/2500A-31.5kA fast vacuum switch using the single-coil electromagnetic repulsion mechanism of the present invention mainly comprises: the device comprises a vacuum arc extinguish chamber, a contact spring, an insulating pull rod, a brake closing and opening retaining device and a single-coil electromagnetic repulsion mechanism. And a movable conducting rod of the vacuum arc extinguish chamber is fixedly connected with a contact spring, an insulating pull rod, a brake closing and opening retaining device and a single-coil electromagnetic repulsion mechanism transmission rod in sequence. The on-off operation of the rapid vacuum switch is driven by a single-coil electromagnetic repulsion mechanism; the contact spring integrated in the insulating pull rod reduces the structure size of a transmission chain of the quick vacuum switch on the one hand, and provides the contact pressure of the quick vacuum switch at the switching-on position on the other hand, so that the phenomenon that the quick vacuum switch is switched off by mistake due to electric power when large current flows through a contact of a vacuum arc extinguish chamber is avoided. In addition, since the rated contact opening distance of the vacuum interrupter is 20 ± 2mm, and the compression overtravel of the contact spring is 4.0mm, the output stroke of the single-coil electromagnetic repulsion mechanism in the present embodiment is set to 24.0 mm.
The two-dimensional and three-dimensional structures of each component of the single-coil electromagnetic repulsion mechanism are respectively shown in fig. 2 and fig. 3, and mainly comprise: the device comprises an opening eddy current plate component 1, a coil casting body 2, a closing eddy current plate component 3, a coil motion component 4 and an insulation support sleeve 5; the opening vortex plate assembly 1 and the closing vortex plate assembly 3 are vertically distributed on the outer periphery of the coil motion assembly 4, and the coil casting body 2 is distributed on the outer periphery of the coil motion assembly 4 and is positioned between the opening vortex plate assembly 1 and the closing vortex plate assembly 3; the insulating support sleeve 5 is positioned between the opening eddy current plate assembly 1 and the closing eddy current plate assembly 3 and positioned outside the coil casting body 2.
The brake separating vortex plate assembly 1 comprises a brake separating vortex plate 101 and a brake separating guide ring 102, wherein the brake separating vortex plate 101 is fixedly connected with the brake separating guide ring 102, and the motion freedom degree of the coil motion assembly is limited to axial motion;
the coil casting body 2 comprises a coil 201, an insulating casting material 202 and a metal insert 203 which are connected in sequence; as shown in fig. 4a and 4b, the metal insert 203 adopts a slotted structure to prevent an induced eddy current from being generated inside the metal insert 203 when the coil 201 is energized, and improve the driving efficiency of the single-coil electromagnetic repulsion mechanism. The coil 201 may be wound using flat copper or aluminum wire into a single, double or multi-layer coil structure. In this embodiment, a single-layer coil structure is adopted, the inner wire inlet and outlet of the coil winding finger is folded to the outer side, and then cast and molded, so as to ensure that the wire inlet and outlet of the coil cast body is arranged on the outer cylindrical surface of the coil, as shown in fig. 5a and 5 b. Meanwhile, the invention provides a schematic diagram of a winding structure of a double-layer or multi-layer coil, as shown in fig. 6a and 6 b. When a double-layer or multi-layer coil structure is adopted, the winding directions of all layers are ensured to be the same, so that the driving efficiency of the electromagnetic repulsion mechanism is improved.
The switching-on vortex plate assembly 3 and the switching-off vortex plate assembly 1 have the same structure and comprise a switching-on vortex plate 301 and a switching-on guide ring 302, the switching-on vortex plate 301 is fixedly connected with the switching-on guide ring 302, and the motion freedom degree of the coil motion assembly 4 is limited to axial motion.
The coil moving assembly 4 includes a driving rod 401, a fastening nut 402, a first fastening guide sleeve 403, a first spacer 404, a second spacer 405, and a second fastening guide sleeve 406. The metal insert 203 of the coil casting body 2 is fixedly pressed by a fastening nut 402 through a first fastening guide sleeve 403 and a second fastening guide sleeve 406 and is fixedly connected with the transmission rod 401; a first gasket 404 is arranged between the first fastening guide sleeve 403 and the coil casting body 2, and a second gasket 406 is arranged between the second fastening guide sleeve 406 and the coil casting body 2, so as to reduce the impact stress of the first fastening guide sleeve 403 or the second fastening guide sleeve 406 on the coil casting body 2 in the switching-on or switching-off operation process of the rapid vacuum switch, and further improve the mechanical reliability of the operation of the rapid vacuum switch.
When the rapid vacuum switch applying the single-coil electromagnetic repulsion mechanism performs closing operation, closing discharge current flows through the coil 201 to generate an axial magnetic field, an eddy current electromagnetic field in a direction opposite to that of the coil magnetic field is induced and generated in the closing eddy current plate 301, and electromagnetic repulsion is generated between the coil 201 and the closing eddy current plate 301; the coil casting body 2 drives the coil moving component 4, the switching-on/off holding device, the insulating pull rod, the vacuum arc-extinguishing chamber moving conducting rod and the like to perform switching-on operation under the action of the electromagnetic repulsion. When the rapid vacuum switch executes the opening operation, the coil casting body 2 drives the coil moving component 4, the opening and closing retaining device, the insulating pull rod, the vacuum arc-extinguishing chamber moving conducting rod and the like to execute the opening operation under the action of electromagnetic repulsion generated between the coil casting body and the opening vortex plate 101.
When the coil cast body 2 moves to be close to the switching-off vortex plate 101, electromagnetic repulsion force exists between the coil cast body 2 and the switching-off vortex plate 101 due to the fact that continuous attenuation switching-on discharge current still exists in the coil 201. In the embodiment, a bistable spring switching-closing retaining device is adopted to overcome the electromagnetic repulsion between the coil casting body 2 and the switching-off vortex plate 101 in the switching-on motion process, and the reliable switching-on operation and switching-on retaining of the rapid vacuum switch are realized. In addition, the electromagnetic repulsion can provide damping acting force for the closing operation of the rapid vacuum switch, and the impact stress on the coil pouring body 2 when the single-coil electromagnetic repulsion mechanism reaches the closing position is reduced. Similarly, in the process of the rapid vacuum switch performing the opening operation, the spring force provided by the bistable spring opening and closing retaining device overcomes the electromagnetic repulsion between the coil 201 and the closing vortex plate 3 on the one hand, and realizes reliable opening operation and opening retaining. Similarly, the electromagnetic repulsion force can also provide damping acting force for the opening operation of the rapid vacuum switch, so that the impact stress borne by the coil pouring body 2 is reduced, and the operation reliability of the single-coil electromagnetic repulsion force mechanism is further improved.
In the present embodiment, the opening vortex plate 101 and the closing vortex plate 301 are made of an aluminum alloy 6065 material with a thickness of 8 mm. Meanwhile, an insulating support sleeve 5 is arranged between the opening vortex plate 101 and the closing vortex plate 301, and the opening vortex plate assembly 1 and the closing vortex plate assembly 3 are fixedly connected by fastening screws. Fig. 7a and 7b are three-dimensional structural views showing the insulating support sleeve 5. The insulating support sleeve 5 is processed and prepared by adopting an insulating glass fiber rubber dipping pipe, so that eddy current generated by induction when the coil 201 is electrified is eliminated, and the driving efficiency of the single-coil electromagnetic repulsion mechanism is improved. The insulating support sleeve 5 is provided with an observation window for observing the switching-on or switching-off state of the coil casting body 2.
Fig. 8a is a diagram of a conventional coil-coil type quick-opening and closing electromagnetic repulsion mechanism, fig. 8b is a diagram of a conventional coil-repulsion disk type quick-opening and closing electromagnetic repulsion mechanism, and fig. 8c is a diagram of a single-coil type electromagnetic repulsion mechanism according to the present invention. Compared with the traditional coil-coil type quick switch electromagnetic repulsion mechanism and the coil-repulsion disc type quick switch electromagnetic repulsion mechanism, the single-coil type electromagnetic magnetic force mechanism provided by the invention can realize the switching-on and switching-off operation of the quick vacuum switch by adopting a single-coil structure on the one hand, fills the technical blank of the electromagnetic repulsion mechanism for the quick vacuum switch, reduces the manufacturing cost of the quick vacuum switch, and is beneficial to the popularization and application of the quick vacuum switch; on the other hand, when the on-off operation of the rapid vacuum switch is close to the on-off position or the off-off position, the single-coil electromagnetic repulsion mechanism can provide damping buffering acting force for the on-off movement of the electromagnetic repulsion mechanism through the discharging current continued in the coil, and the mechanical reliability of the on-off operation of the rapid vacuum switch is obviously improved.
Claims (8)
1. A single-coil electromagnetic repulsion mechanism for a rapid vacuum switch is characterized by comprising a switching-off vortex plate component (1), a coil casting body (2), a switching-on vortex plate component (3), a coil motion component (4) and an insulating support sleeve (5); the switching-off eddy current plate assembly (1) and the switching-on eddy current plate assembly (3) are vertically distributed on the outer periphery of the coil moving assembly (4), and the coil pouring body (2) is distributed on the outer periphery of the coil moving assembly (4) and is positioned between the switching-off eddy current plate assembly (1) and the switching-on eddy current plate assembly (3); the insulation support sleeve (5) is positioned between the switching-off eddy current plate component (1) and the switching-on eddy current plate component (3) and is positioned on the outer side of the coil casting body (2);
the brake separating vortex plate component (1) comprises a brake separating vortex plate (101) and a brake separating guide ring (102), the brake separating vortex plate (101) is fixedly connected with the brake separating guide ring (102), and the motion freedom degree of the coil motion component (4) is limited to axial motion;
the coil casting body (2) comprises a coil (201), an insulating casting material (202) and a metal insert (203) which are connected in sequence;
the switching-on eddy current plate assembly (3) comprises a switching-on eddy current plate (301) and a switching-on guide ring (302), the switching-on eddy current plate (301) is fixedly connected with the switching-on guide ring (302), and the movement freedom degree of the coil movement assembly (4) is limited to axial movement;
the coil moving assembly (4) comprises a transmission rod (401), a fastening nut (402), a first fastening guide sleeve (403), a first gasket (404), a second gasket (405) and a second fastening guide sleeve (406);
the metal insert (203) of the coil casting body (2) is fixedly pressed by a fastening nut (402) through a first fastening guide sleeve (403) and a second fastening guide sleeve (406) and is fixedly connected with a transmission rod (401); a first gasket (404) is arranged between the first fastening guide sleeve (403) and the coil casting body (2), and a second gasket (405) is arranged between the second fastening guide sleeve (406) and the coil casting body (2) to reduce the impact stress of the switching-on and switching-off operation of the rapid vacuum switch on the coil casting body (2).
2. The single-coil electromagnetic repulsion mechanism for the fast vacuum switch according to claim 1, characterized in that when the fast vacuum switch is in the closing position, a certain length of air gap is reserved between the coil casting body (2) and the separating brake eddy current plate (101) to prevent the coil casting body (2) and the separating brake eddy current plate (101) from directly colliding during the closing operation of the fast vacuum switch; the gap is realized by the limit fit of the middle groove of the brake separating vortex plate (101) and the boss at the outer side of the first fastening guide sleeve (403); when the rapid vacuum switch is at a switching-off position, an air gap with a certain length is reserved between the coil pouring body (2) and the switching-on vortex plate (301) to prevent the coil pouring body (2) and the switching-on vortex plate (301) from generating direct collision in the switching-off operation process of the rapid switch, and the gap is realized by limiting and matching the middle groove of the switching-on vortex plate (302) and the boss at the outer side of the second fastening guide sleeve (406).
3. The single-coil electromagnetic repulsion mechanism for the fast vacuum switch according to claim 1, characterized in that the opening eddy current plate (101) and the closing eddy current plate (301) are made of non-ferromagnetic metal material with high conductivity;
the opening guide ring (102) and the closing guide ring (302) are made of brass materials.
4. A single-coil electromagnetic repulsion mechanism for fast vacuum switch according to claim 1 characterized by that, the coil (201) is wound with flat copper wire or aluminum wire to form single-layer, double-layer or multi-layer coil structure;
for a single-layer coil structure, the inner side inlet and outlet wires wound by the coil (201) are folded to the outer side, and then casting molding is carried out to ensure that the inlet and outlet wires of the coil casting body (2) are arranged on the outer side cylindrical surface of the coil;
for a double-layer or multi-layer coil structure, the same winding direction of each layer needs to be ensured so as to improve the driving efficiency of the electromagnetic repulsion mechanism, and the incoming and outgoing lines of the coil casting body (2) need to be arranged on the outer cylindrical surface of the coil.
5. The single-coil electromagnetic repulsion mechanism for fast vacuum switch according to claim 1, characterized in that the insulating casting material (202) is made by SMC high temperature compression molding process, or epoxy resin vacuum casting process, or glass fiber reinforced epoxy casting process.
6. The single-coil electromagnetic repulsion mechanism for the fast vacuum switch according to claim 1, characterized in that the metal insert (203) adopts a slotted structure to prevent the induction eddy current generated inside the metal insert (203) when the coil (201) is energized, thereby improving the driving efficiency of the single-coil electromagnetic repulsion mechanism.
7. The single-coil electromagnetic repulsion mechanism for fast vacuum switch according to claim 1, characterized in that the insulation support sleeve (5) is provided with an observation window for observing the closing or opening state of the coil cast (2).
8. The operating method of a single-coil electromagnetic repulsion mechanism for a fast vacuum switch according to any of the claims 1 to 7 is characterized in that, when the fast vacuum switch performs a closing operation, the coil (201) flows through a closing discharge current to generate an axial magnetic field, and induces an eddy current electromagnetic field in a closing vortex plate (301) in a direction opposite to the direction of the coil magnetic field, and at the same time, the coil (201) generates an electromagnetic repulsion force with the closing vortex plate (301); the coil casting body (2) drives the coil motion assembly (4), the switching-on/off holding device, the insulating pull rod, the contact spring and the movable conducting rod of the vacuum arc extinguish chamber to perform switching-on operation under the action of the electromagnetic repulsion force; when the rapid vacuum switch is switched on and operated to be close to a switching-on position, the discharge current continued in the coil (201) induces and generates an eddy reverse magnetic field in the switching-off eddy current plate (101), and generates a damping buffer effect on the switching-on motion of the coil pouring body (2) and the coil motion assembly (4);
when the rapid vacuum switch is operated in a brake-off mode, brake-off discharge current flows in the coil (201) to generate an axial magnetic field, an eddy current electromagnetic field opposite to the direction of the coil (201) is induced in the brake-off eddy current plate (101), and meanwhile electromagnetic repulsion is generated between the coil (201) and the brake-off eddy current plate (101); the coil casting body (2) drives the coil motion assembly (4), the brake closing and opening retaining device, the insulating pull rod, the contact spring and the movable conducting rod of the vacuum arc extinguish chamber to perform brake opening operation under the action of the electromagnetic repulsion force; when the opening operation is close to the opening position, the coil (201) induces a reverse eddy magnetic field in the closing eddy current plate (301) and generates a damping buffer effect for the opening movement of the coil pouring body (2) and the coil moving assembly (4); the damping buffer characteristic can obviously improve the mechanical reliability of the opening and closing operation of the single-coil electromagnetic repulsion mechanism.
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| CN202210333735.0A CN114783824A (en) | 2022-03-31 | 2022-03-31 | Single-coil electromagnetic repulsion mechanism for rapid vacuum switch and working method |
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| CN117153618A (en) * | 2023-09-14 | 2023-12-01 | 西安高压电器研究院股份有限公司 | Device for limiting switching-off rebound of high-voltage vacuum switch, high-voltage vacuum switch and switching-off method thereof |
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