CN116844911B - Electromagnetic repulsion mechanism for synchronous switching-on and switching-off of multipath parallel circuit breakers - Google Patents
Electromagnetic repulsion mechanism for synchronous switching-on and switching-off of multipath parallel circuit breakers 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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- 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
- H01H33/02—Details
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/38—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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Abstract
The invention discloses an electromagnetic repulsion mechanism for synchronously switching on and off a plurality of parallel circuit breakers, which comprises a repulsion disc, wherein the repulsion disc comprises an inner annular body and an outer annular body which are concentrically and alternately arranged, a plurality of fan-shaped connecting blocks are annularly and equally spaced on the inner wall of the outer annular body and are connected with the outer wall of the inner annular body, the number of the fan-shaped connecting blocks is equal to that of the parallel circuit breakers, each fan-shaped connecting block is provided with a transmission rod, the transmission rods are uniformly arranged on the repulsion disc in a regular polygon manner, and one end of each transmission rod, which is far away from the repulsion disc, is correspondingly connected with an arc-extinguishing chamber movable contact guide rod of each parallel circuit breaker; two coils connected in series are arranged above the repulsive force disc, the coils are wound in a circular ring shape, and the sizes of the inner coil and the outer coil are matched with the sizes of the inner ring body and the outer ring body of the repulsive force disc. The invention can meet the requirement of synchronous and rapid disconnection of a plurality of arc extinguishing chambers.
Description
Technical Field
The invention belongs to the technical field of electromagnetic repulsion mechanisms, and particularly relates to an electromagnetic repulsion mechanism for synchronously switching on and off a multi-path parallel circuit breaker.
Background
Generally, the electromagnetic repulsion mechanism consists of an energy storage capacitor, an exciting coil, a metal disc, a transmission rod and a moving contact, and the working principle is as follows: the capacitor is pre-charged with rated voltage U, the switch K is closed, pulse current flows in the exciting coil, a magnetic field with abrupt change is generated in the space, the metal disc induces eddy current in the changing magnetic field, the eddy current receives Lorentz force in the magnetic field, the metal disc is stressed to move, and the transmission rod and the moving contact are driven by the metal plate to move together, so that the opening and closing of the circuit breaker are completed. The electromagnetic repulsion mechanism has the advantages of short response time, high rigid separation speed, simple structure and the like, and can drive the contact to reach the rated insulation distance within a few milliseconds, and is widely applied to the field of vacuum switches at present.
Generator outlet circuit breakers are important devices for breaking electrical circuits when a generator fails. In recent years, the single-machine capacity of a newly-increased generator set in China reaches millions of kilowatts, rated current and short-circuit current are large, and the current capacity and the arc extinguishing capacity of an arc extinguishing chamber of a single circuit breaker are limited, so that a plurality of arc extinguishing chambers are required to be connected in parallel for use. When the multi-path parallel arc-extinguishing chambers are cut off, rapidity and synchronism are required to be ensured, and the traditional structure and technology can only complete rapid cutting off of a single arc-extinguishing chamber and cannot meet the requirements.
Therefore, it is necessary to study an electromagnetic repulsion mechanism for synchronously switching on and off the multi-path parallel circuit breaker so as to meet the requirement of synchronously and quickly switching on and off a plurality of arc extinguishing chambers.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims at an electromagnetic repulsion mechanism for synchronously switching on and off a multi-path parallel circuit breaker, and can meet the requirement of synchronous and quick switching on and off of a plurality of arc extinguishing chambers.
In order to achieve the above purpose, the invention provides an electromagnetic repulsion mechanism for synchronously switching on and off a plurality of parallel circuit breakers, which comprises a repulsion disc, wherein the repulsion disc comprises an inner annular body and an outer annular body which are concentrically arranged at intervals, a plurality of fan-shaped connecting blocks are annularly arranged on the inner wall of the outer annular body at equal intervals and are connected with the outer wall of the inner annular body, the number of the fan-shaped connecting blocks is equal to that of the parallel circuit breakers, each fan-shaped connecting block is provided with a transmission rod, the transmission rods are uniformly arranged on the repulsion disc in a regular polygon manner, and one end of each transmission rod, which is far away from the repulsion disc, is correspondingly connected with an arc-extinguishing chamber movable contact guide rod of each parallel circuit breaker; two coils connected in series are arranged above the repulsive force disc, the coils are wound in a circular ring shape, and the sizes of the inner coil and the outer coil are matched with the sizes of the inner ring body and the outer ring body of the repulsive force disc;
when the parallel circuit breaker works, pulse current is introduced into the two coils connected in series, so that the coils generate a changing magnetic field around the repulsive force disc, the changing magnetic field induces eddy currents in the repulsive force disc, the eddy currents are subjected to Lorentz force under the magnetic field generated by the coils, and the repulsive force disc is stressed to drive a plurality of transmission rods on the eddy currents to move, so that the synchronous quick opening and closing of the parallel circuit breaker are completed.
The electromagnetic repulsion mechanism for synchronously switching on and off the multipath parallel circuit breakers provided by the invention has the following effects: (1) Two ends of each transmission rod are respectively connected to the moving contact and the repulsive force disc of the multipath parallel circuit breaker, so that the multipath parallel circuit breaker can be synchronously opened and closed; (2) The repulsive force disc is arranged into a double-circular-ring structure, so that the inside and the outside of a connecting area of the transmission rod are subjected to electromagnetic repulsive force, the movement of the repulsive force disc is accelerated, and the rapid breaking of the multi-path parallel circuit breaker is realized; (3) The middle of the repulsive force disc is hollowed, so that the inside of the repulsive force disc is a circular ring, the weight of the repulsive force disc is reduced, and the efficiency of the repulsive force disc is improved; in addition, the connection area of the transmission rod and the repulsive force disc is in a fan shape, so that the stress distribution of the repulsive force disc during stressed movement is more uniform, the area between the connection areas is hollowed, the weight of the repulsive force disc can be reduced, and the efficiency is further improved.
In one embodiment, in the annular direction in which the plurality of fan-shaped connecting blocks are distributed, the calculation formula of the distance d between two adjacent transmission rods is as follows:
d＝2R+d 1
wherein R is the outer radius of an arc extinguishing chamber of the circuit breaker; d, d 1 Is a safe distance between arc extinguishing chambers of the circuit breaker.
In one embodiment, the outer radius R of the inner ring body in the repulsive force disk 1 And the inner diameter R of the outer ring body 3 The calculation formula of (2) is as follows:
R 1 ＝R 2 -r-d 2 ，R 3 ＝R 2 +r+d 2
wherein r is determined by the radius of a movable contact guide rod of an arc extinguish chamber of the circuit breaker; d, d 2 D is the distance between the transmission rod and the outer radius of the inner coil and the distance between the transmission rod and the inner radius of the outer coil 2 0.1-2 cm; r is R 2 The radius of the regular polygon circumscribed circle is determined according to the distance d between two adjacent transmission rods in the annular direction.
In one embodiment, the inner radius R of the inner ring body in the repulsive force disc 0 And the outer radius R of the outer ring body 4 The calculation formula of (2) is as follows:
wherein S is n Is the area of the upper surface of the inner ring body,S w for the area of the upper surface of the outer ring body +.>s n Is the upper surface of the inner ring body; s is(s) w Is the upper surface of the outer ring body; n is the number of parallel circuit breakers; f (F) n To repulsive force the force of the inner ring body in the disc, the force of the inner ring body F n With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And the outer radius R of the outer ring body 4 Correlation, according to simulation data pair F n 、R 0 、R 4 Is analyzed to obtain F n ＝f(R 0 ,R 4 ) The method comprises the steps of carrying out a first treatment on the surface of the Force F of the outer ring body w With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And the outer radius R of the outer ring body 4 Correlation, according to simulation data pair F n 、R 0 、R 4 Is analyzed to obtain F w ＝g(R 0 ,R 4 )。
In one embodiment, the thickness of the repulsive force disc is determined by the current skin depth and the desired overall mechanical strength.
In one embodiment, the distance between the repulsive force disc and the coil is 0.1-1 cm.
In one embodiment, the repulsive force disk is made of copper or aluminum materials.
In one embodiment, a pulse current is applied to two coils in series through a pulse circuit, wherein,
the pulse circuit comprises a high-voltage transformer, a protection resistor, a rectifier, a capacitor bank and a high-voltage switch, wherein a primary winding of the high-voltage transformer is connected with a mains supply, one end of a secondary winding of the high-voltage transformer is respectively connected with one end of the high-voltage switch and one end of the capacitor bank through the protection resistor and the rectifier, one end of each of the two coils in series connection is connected with the other end of the high-voltage switch, and the other end of the two coils in series connection, the other end of the capacitor bank and the other end of the secondary winding of the high-voltage transformer are grounded.
Drawings
Fig. 1 is a structural diagram (left) and a sectional diagram (right) of an electromagnetic repulsion mechanism for synchronously opening and closing a three-way parallel circuit breaker;
fig. 2 is a structural view (left) and a sectional view (right) of an electromagnetic repulsion mechanism for synchronously opening and closing a four-way parallel circuit breaker;
fig. 3 is a structural view (left) and a sectional view (right) of an electromagnetic repulsion mechanism for synchronously opening and closing five-way parallel circuit breakers provided by the invention;
fig. 4 is a structural view (left) and a sectional view (right) of an electromagnetic repulsion mechanism for synchronously opening and closing a six-way parallel circuit breaker provided by the invention;
FIG. 5 is a schematic circuit diagram of a pulse circuit provided by the present invention;
FIG. 6 is a cross-sectional view of a repulsive force disk provided by an embodiment of the present invention;
FIG. 7 is a force analysis diagram of the repulsive force disk of FIG. 6;
fig. 8 is a schematic diagram of a six-way parallel circuit breaker provided by the invention;
fig. 9 is a cross-sectional view of a repulsive force disk provided by another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to meet the requirement of synchronous and rapid breaking of a plurality of arc-extinguishing chambers, the invention provides an electromagnetic repulsion mechanism for synchronous breaking of a multi-path parallel circuit breaker, and the electromagnetic repulsion mechanism comprises a repulsion disc 3, a plurality of transmission rods 1 and two coils 2 which are connected in series as shown in figures 1-4.
The repulsion disc 3 comprises an inner ring body and an outer ring body which are concentrically arranged at intervals, a plurality of fan-shaped connecting blocks are annularly arranged on the inner wall of the outer ring body at equal intervals and are connected with the outer wall of the inner ring body, and the number of the fan-shaped connecting blocks is equal to that of the parallel circuit breakers. One ends of the transmission rods 1 are correspondingly connected to the fan-shaped connecting blocks, namely, the transmission rods 1 are connected to the same repulsive force disc 3, and the other ends of the transmission rods 1 are correspondingly connected with the movable contact guide rods of the arc extinguishing chambers of the parallel circuit breakers, so that the multichannel parallel circuit breakers can be driven to synchronously open and close when the repulsive force disc 3 moves under stress.
In this embodiment, the transmission rods 1 are uniformly arranged above the repulsive force disc 3 in a regular polygon manner. And two coils connected in series are arranged above the repulsive force disc 3, the coils are wound in a circular ring shape, and the sizes of the inner coil and the outer coil are matched with the sizes of the inner ring body and the outer ring body of the repulsive force disc.
When the parallel circuit breaker works, pulse current is introduced into the two coils connected in series, so that the coils generate a changing magnetic field around the repulsive force disc, the changing magnetic field induces eddy currents in the repulsive force disc, the eddy currents are subjected to Lorentz force under the magnetic field generated by the coils, and the repulsive force disc is stressed to drive a plurality of transmission rods on the eddy currents to move, so that the synchronous quick opening and closing of the parallel circuit breaker are completed.
Specifically, a pulse current may be applied to the two coils connected in series through a pulse circuit. Preferably, as shown in fig. 5, the pulse circuit may adopt a topological circuit composed of a high-voltage transformer, a protection resistor, a rectifier, a capacitor bank and a high-voltage switch, wherein a primary winding of the high-voltage transformer is connected with a mains supply, one end of a secondary winding of the high-voltage transformer is respectively connected with one end of the high-voltage switch and one end of the capacitor bank through the protection resistor and the rectifier, one end of a series connection two coils is connected with the other end of the high-voltage switch, and the other ends of the series connection two coils, the other end of the capacitor bank and the other end of a secondary winding of the high-voltage transformer are grounded.
The working principle of the pulse circuit provided by the embodiment is as follows: when the high-voltage switch works, the high-voltage switch is firstly disconnected, and the high-voltage transformer charges the capacitor bank to a specified voltage; when the high-voltage switch is closed and the capacitor bank is discharged to the coil, huge pulse current flows through the coil, the coil generates a rapidly-changing magnetic field around the repulsive force disc, the changed magnetic field induces eddy currents in the repulsive force disc, the eddy currents are subjected to huge Lorentz force under the magnetic field generated by the coil, and the repulsive force disc is stressed to drive the parallel transmission rod to move, so that the moving contacts of the parallel arc extinguishing chambers are synchronously and rapidly opened.
The electromagnetic repulsion mechanism for synchronously switching on and off the multipath parallel circuit breakers provided by the embodiment has the following effects: (1) Two ends of each transmission rod are respectively connected to the moving contact and the repulsive force disc of the multipath parallel circuit breaker, so that the multipath parallel circuit breaker can be synchronously opened and closed; (2) The repulsive force disc is arranged into a double-circular-ring structure, so that the inside and the outside of a connecting area of the transmission rod are subjected to electromagnetic repulsive force, the movement of the repulsive force disc is accelerated, and the rapid breaking of the multi-path parallel circuit breaker is realized; (3) The middle of the repulsive force disc is hollowed, so that the inside of the repulsive force disc is a circular ring, the weight of the repulsive force disc is reduced, and the efficiency of the repulsive force disc is improved; in addition, the connection area of the transmission rod and the repulsive force disc is in a fan shape, so that the stress distribution of the repulsive force disc during stressed movement is more uniform, the area between the connection areas is hollowed, the weight of the repulsive force disc can be reduced, and the efficiency is further improved.
In one embodiment, the parameters of the electromagnetic repulsion mechanism provided by the invention are set as follows:
the cross section of the repulsive force disc is shown in fig. 6, the same number of transmission rods are arranged according to regular polygons according to the number of the parallel arc extinguishing chambers, and the parallel arc extinguishing chambers need to consider the factors such as insulation distance, heat dissipation and the like, so that a certain safety distance d needs to be arranged between the arc extinguishing chambers 1 The distance d between the transmission rods is determined by the size of the arc extinguishing chamber of the circuit breaker and the safety distance d 1 Determination, i.e. d=2 r+d 1 Wherein R is the radius of the arc extinguishing chamber, d 1 Is a safe distance between the arc extinguishing chambers.
The transmission rod is connected with an arc extinguish chamber movable contact guide rod of the circuit breaker, and the radius r of the transmission rod is determined by the radius of the movable contact guide rod. The inner and outer diameters of the inner and outer coils are the same as the inner and outer diameters of the inner and outer ring bodies of the repulsive force disc, the coils need to be well fixed, and the transmission rod does not touch the coils when moving, so that the transmission rod keeps a certain distance d with the outer radius of the inner coil and the inner radius of the outer coil 2 . Thereby, the outer radius R of the inner ring body of the repulsive force disk can be determined 1 And the inner diameter R of the outer ring body 3 ：R 1 ＝R 2 -r-d 2 ，R 3 ＝R 2 +r+d 2 Distance d 2 Taking 0.1-2 cm.
Transmission rod and repulsive force disc connected sector area circleHeart angleAlpha may be 1-15 deg.. The coil is positioned on the repulsive force disc, the smaller the distance between the coil and the repulsive force disc is, the larger the electromagnetic repulsive force exerted on the repulsive force disc is, the higher the efficiency of the repulsive force mechanism is, the distance between the coil and the repulsive force disc is 0.1-1 cm in consideration of actual installation of the device, and the inner diameter and the outer diameter of the inner coil and the outer coil are the same as the inner diameter and the outer diameter of the inner ring body and the outer ring body of the repulsive force disc. The repulsive force disc has symmetry, and when the parallel arc extinguishing chambers are n, 1/n of the repulsive force disc can be taken for analysis. The inner ring body and the outer ring body of the repulsive force disc are stressed to drive the transmission rod to move, so that the whole mechanism is rapidly and synchronously opened and closed, the synchronism of the movement of the inner ring body and the movement of the outer ring body is ensured, and therefore stress analysis is carried out on the mechanism in FIG. 6.
As shown in fig. 7, the inner and outer annular bodies of the repulsive force disc are subjected to forces in the vertical direction planes, and the inner and outer annular bodies are stressed to move so as to drive the transmission rod to move. When the inner ring body and the outer ring body move synchronously, the whole mechanism moves along the axial direction of the transmission rod, the inner ring body and the outer ring body are stressed uniformly, and the moment of the center A of the transmission rod is 0. Let the cross-section be the xoy plane and the direction of motion be the z-axis, the following formula can be obtained:
wherein F is n Is stressed by an inner ring body, F w Is the stress of the outer ring body s n Is the upper surface of the inner ring body s w Is the upper surface of the outer ring body, S n Is the area of the upper surface of the inner ring body, S w Is the area of the upper surface of the outer ring body. Force F of the inner ring body n With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And outer radius R of outer ring 4 Correlation, F can be performed according to simulation data n 、R 0 、R 4 Is analyzed to obtain F n ＝f(R 0 ,R 4 ). Similarly, the stress F of the outer ring body w With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And the outer radius R of the outer ring body 4 Correlation, F can be performed according to simulation data n 、R 0 、R 4 Is analyzed to obtain F w ＝g(R 0 ,R 4 ). This can be achieved by:
the inner radius R of the inner ring body of the repulsive force disc can be obtained by analysis according to the above method 0 And the outer radius R of the outer ring body 4 The size can ensure that the inner ring and the outer ring have good synchronism when the mechanism moves, and the stress distribution of the repulsive force disc is uniform at the moment. In addition, the thickness of the repulsive force disc is determined by the current skin depth and the required overall mechanical strength.
In one embodiment, on the one hand, the electromagnetic repulsion mechanism provided by the invention is based on the principle that induced eddy currents are subjected to repulsion in a magnetic field, and the eddy currents i=e/R, E are induced electromotive forces, and R is an eddy current path resistance, so that the material with high conductivity can be selected for the repulsion disc provided by the embodiment, so that the eddy current path resistance is reduced, the induced eddy currents are increased, and the electromagnetic repulsion is increased. On the other hand, in order to ensure that the repulsive force disc is not deformed, a material with high mechanical strength can be selected; in terms of quality, under the condition of ensuring mechanical strength, the reduction of the quality of the repulsive force disc is beneficial to the improvement of efficiency, so that the repulsive force disc can be made of materials with small density. In summary, the repulsive force disc provided in this embodiment may be made of a material with high conductivity, low density and high mechanical strength, such as copper, aluminum, etc.
The electromagnetic repulsion mechanism provided by the invention is correspondingly described below with reference to the specific embodiment:
according to the description, the breaker operating mechanism with rated voltage of 31.5kV, rated current of 28.5kA and short-circuit current of 250kA is designed.
In order to meet the requirements of through-flow and arc extinction, the circuit breaker adopts six vacuum arc-extinguishing chambers connected in parallel, the rated opening distance is 20mm, the structure of the electromagnetic repulsion mechanism is shown in figure 8, wherein the diameter of each transmission rod is 7.4cm, and the height is 30cm. The section of the repulsive force disc is shown in fig. 9, the distance between the transmission rods is determined by the outer diameter of the arc extinguishing chamber and the safety distance, so that the distance between the circle of the repulsive force disc and the center of the transmission rods is 34cm, and further the outer radius of the inner ring body is 30cm, and the inner radius of the outer ring body is 38cm. The central angle of the connecting fan-shaped areas of the transmission rod is 20 degrees, the six fan-shaped areas are uniformly arranged, and the thickness of the transmission rod is 1.5cm in consideration of the mechanical strength of the repulsive force disc and the current skin depth.
According to the fact that the stress of the inner ring body and the outer ring body of the repulsive force disc on the circle center moment of the transmission rod is zero, the inner radius of the inner ring body of the repulsive force disc is 25cm, and the outer radius of the outer ring body is 43cm. The coil is wound by copper wires with the cross section of 0.2cm multiplied by 1cm, the inner ring coil is 20 turns, the outer ring coil is 18 turns, the inner radius of the wound inner coil is 25cm, and the outer radius is 30cm; the inner radius of the wound outer coil is 38cm, the outer radius is 43cm, and the distance between the coil and the repulsive force disc is 0.1cm.
The coils are connected in series and then connected into a pulse circuit, the schematic diagram of which is shown in fig. 5, wherein the capacitor is 10mF and the precharge voltage is 800V.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The electromagnetic repulsion mechanism for synchronously switching on and off the multipath parallel circuit breakers is characterized by comprising a repulsion disc, wherein the repulsion disc comprises an inner ring body and an outer ring body which are concentrically arranged at intervals, a plurality of fan-shaped connecting blocks are annularly arranged on the inner wall of the outer ring body at equal intervals and are connected with the outer wall of the inner ring body, the number of the fan-shaped connecting blocks is equal to that of the parallel circuit breakers, each fan-shaped connecting block is provided with a transmission rod, the transmission rods are uniformly arranged on the repulsion disc in a regular polygon mode, and one end of each transmission rod, which is far away from the repulsion disc, is correspondingly connected with an arc-extinguishing chamber movable contact guide rod of each parallel circuit breaker; two coils connected in series are arranged above the repulsive force disc, the coils are wound in a circular ring shape, and the sizes of the inner coil and the outer coil are matched with the sizes of the inner ring body and the outer ring body of the repulsive force disc;
when the circuit breaker works, pulse current is introduced into two coils connected in series, so that the coils generate a changed magnetic field around the repulsive force disc, the changed magnetic field induces eddy currents in the repulsive force disc, the eddy currents are subjected to Lorentz force under the magnetic field generated by the coils, and the repulsive force disc is stressed to drive a plurality of transmission rods on the eddy currents to move, so that synchronous and rapid opening and closing of the multi-path parallel circuit breaker are completed;
in the annular direction in which the plurality of fan-shaped connecting blocks are distributed, the calculation formula of the distance d between every two adjacent transmission rods is as follows:
d＝2R+d 1
wherein R is the outer radius of an arc extinguishing chamber of the circuit breaker; d, d 1 The safety distance between arc extinguishing chambers of the circuit breaker is set;
the outer radius R of the inner ring body in the repulsive force disk 1 And the inner diameter R of the outer ring body 3 The calculation formula of (2) is as follows:
R 1 ＝R 2 -r-d 2 ，R 3 ＝R 2 +r+d 2
wherein r is determined by the radius of a movable contact guide rod of an arc extinguish chamber of the circuit breaker; d, d 2 D is the distance between the transmission rod and the outer radius of the inner coil and the distance between the transmission rod and the inner radius of the outer coil 2 0.1-2 cm; r is R 2 The radius of the regular polygon circumscribed circle is determined according to the distance d between two adjacent transmission rods in the annular direction;
inner radius R of inner ring body in repulsive force disc 0 And the outer radius R of the outer ring body 4 The calculation formula of (2) is as follows:
wherein S is n Is the area of the upper surface of the inner ring body,S w is the area of the upper surface of the outer ring body,s n is the upper surface of the inner ring body; s is(s) w Is the upper surface of the outer ring body; n is the number of parallel circuit breakers; f (F) n To repulsive force the force of the inner ring body in the disc, the force of the inner ring body F n With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And the outer radius R of the outer ring body 4 Correlation, according to simulation data pair F n 、R 0 、R 4 Is analyzed to obtain F n ＝f(R 0 ,R 4 ) The method comprises the steps of carrying out a first treatment on the surface of the Force F of the outer ring body w With the number of turns N of the inner coil 1 And number of turns N of the outer coil 2 Correlation, N 1 And N 2 With the inner radius R of the inner ring body 0 And the outer radius R of the outer ring body 4 Correlation, according to simulation data pair F n 、R 0 、R 4 Is analyzed to obtain F w ＝g(R 0 ,R 4 )。
2. The electromagnetic repulsion mechanism for simultaneous opening and closing of multiple circuit breakers in parallel as claimed in claim 1, wherein the thickness of the repulsion tray is determined by the current skin depth and the required overall mechanical strength.
3. The electromagnetic repulsion mechanism for synchronously opening and closing a plurality of parallel circuit breakers of claim 1, wherein the distance between the repulsion tray and the coil is 0.1-1 cm.
4. The electromagnetic repulsion mechanism for synchronous opening and closing of multiple parallel circuit breakers of claim 1 wherein the repulsion tray is made of copper or aluminum materials.
5. The electromagnetic repulsion mechanism for synchronous opening and closing of multiple parallel circuit breakers of claim 1 wherein pulsed current is applied to both coils in series through a pulsing circuit wherein,
the pulse circuit comprises a high-voltage transformer, a protection resistor, a rectifier, a capacitor bank and a high-voltage switch, wherein a primary winding of the high-voltage transformer is connected with a mains supply, one end of a secondary winding of the high-voltage transformer is respectively connected with one end of the high-voltage switch and one end of the capacitor bank through the protection resistor and the rectifier, one end of each of the two coils in series connection is connected with the other end of the high-voltage switch, and the other end of the two coils in series connection, the other end of the capacitor bank and the other end of the secondary winding of the high-voltage transformer are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2846802A1 (en) * | 2002-11-06 | 2004-05-07 | Mitsubishi Electric Corp | Apparatus under metallic envelope, uses vacuum-case breaker valves for supporting bus-side conduction bands on interior wall of hermetic container filled with insulating gas, has each valve circuit breaker installed on common axis |
| JP2009140639A (en) * | 2007-12-04 | 2009-06-25 | Tokyo Denki Univ | Shunt type superconducting current limiter |
| CN103280372A (en) * | 2013-05-16 | 2013-09-04 | 上海合凯电气科技有限公司 | Fast eddy current drive mechanism |
| CN107275145A (en) * | 2017-06-08 | 2017-10-20 | 山东泰开高压开关有限公司 | A kind of Quick mechanical formula switch and the high-voltage electric power system switched using the Quick mechanical formula |
| CN113593986A (en) * | 2021-06-17 | 2021-11-02 | 国网浙江省电力有限公司 | Cascade progressive electromagnetic repulsion mechanism and circuit breaker using same |
-
2023
- 2023-07-07 CN CN202310837377.1A patent/CN116844911B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2846802A1 (en) * | 2002-11-06 | 2004-05-07 | Mitsubishi Electric Corp | Apparatus under metallic envelope, uses vacuum-case breaker valves for supporting bus-side conduction bands on interior wall of hermetic container filled with insulating gas, has each valve circuit breaker installed on common axis |
| JP2009140639A (en) * | 2007-12-04 | 2009-06-25 | Tokyo Denki Univ | Shunt type superconducting current limiter |
| CN103280372A (en) * | 2013-05-16 | 2013-09-04 | 上海合凯电气科技有限公司 | Fast eddy current drive mechanism |
| CN107275145A (en) * | 2017-06-08 | 2017-10-20 | 山东泰开高压开关有限公司 | A kind of Quick mechanical formula switch and the high-voltage electric power system switched using the Quick mechanical formula |
| CN113593986A (en) * | 2021-06-17 | 2021-11-02 | 国网浙江省电力有限公司 | Cascade progressive electromagnetic repulsion mechanism and circuit breaker using same |
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|---|---|
| CN116844911A (en) | 2023-10-03 |
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