CN116313676A - Contact structure for raising arc voltage under external magnetic field - Google Patents
Contact structure for raising arc voltage under external magnetic field Download PDFInfo
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- CN116313676A CN116313676A CN202310290378.9A CN202310290378A CN116313676A CN 116313676 A CN116313676 A CN 116313676A CN 202310290378 A CN202310290378 A CN 202310290378A CN 116313676 A CN116313676 A CN 116313676A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 135
- 239000002184 metal Substances 0.000 claims abstract description 135
- 238000002844 melting Methods 0.000 claims abstract description 17
- 230000008018 melting Effects 0.000 claims abstract description 16
- 229910003460 diamond Inorganic materials 0.000 claims description 7
- 239000010432 diamond Substances 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 5
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 claims description 3
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 241000276425 Xiphophorus maculatus Species 0.000 claims 1
- 238000010891 electric arc Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 18
- 230000002829 reductive effect Effects 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 5
- 229910001338 liquidmetal Inorganic materials 0.000 description 4
- 238000002679 ablation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a contact structure for raising arc voltage under an external magnetic field, which belongs to the technical field of breaker equipment and comprises a fixed contact, wherein a moving contact is arranged on one side of the fixed contact and is parallel to the fixed contact, two first metal contact flaps are symmetrically arranged on one side of a contact surface of the fixed contact and the moving contact, a plurality of second metal contact flaps are symmetrically arranged on the contact surface of the fixed contact and the moving contact, a plurality of open slots are formed by disconnecting adjacent second metal contact flaps and between the first metal contact flaps and the second metal contact flaps, the melting point of the second metal contact flaps is higher than that of the first metal contact flaps, and the external magnetic field is arranged on the outer sides of the fixed contact and the moving contact; according to the invention, through the cooperation of the fixed contact and the moving contact with the high and first metal contact petals, the arcing of the electric arc on the first metal contact petals can be realized, and under the action of an external magnetic field, the lorentz force drives the electric arc to rapidly move towards the edges of the first metal contact petals to improve the electric arc voltage, so that the conductive surface is prevented from being ablated by the contact.
Description
Technical Field
The invention belongs to the technical field of breaker equipment, and particularly relates to a contact structure for increasing arc voltage under an external magnetic field.
Background
At present, along with the continuous development of society, various energy sources are interconnected, the power industry of China is also continuously updated, the system structure and the operation mode are more complex and various, the system capacity is gradually increased, and the potential influence of short circuit hazard is huge. Thus, there is a need for a technique to reliably remove short circuit faults, and circuit breakers are key devices in power systems to remove short circuit faults. Along with the continuous development of an alternating current system, an alternating current breaker is developed to be mature, but new energy is accessed and distributed energy is developed greatly at present, a direct current system is gradually perfected, the capacity of the direct current system is gradually increased from a miniaturized locomotive direct current breaker to an ultrahigh voltage direct current transmission system breaker, the short circuit fault mode is diversified, the short circuit current rising rate is high, and the requirement on the opening of the direct current breaker is higher. Compared with the alternating current break, the direct current break has no natural zero crossing point, and has a plurality of technical difficulties.
The existing direct current breaking method comprises a forced zero crossing method, a transfer breaking method and an arc voltage increasing method, wherein the forced zero crossing method is to superimpose a reverse current on the basis of an original current to generate a zero crossing point for breaking, the transfer breaking method is to connect a transfer switch with a power electronic breaker or a fuse in parallel, the current is quickly transferred to a device connected in parallel during fault, and the arc voltage increasing method is to directly increase the arc voltage to the system voltage for direct current breaking. The requirement on the contact is high when the circuit breaker acts rapidly, so that the electric arc is required to be extinguished rapidly, the bearing capacity of the contact is high, and the service life of the contact is long.
When the direct current starting is performed by using the arc voltage increasing method, it is necessary to achieve the position fixation of the starting point and the rapid extinction of the arc. Currently, the prior patent document CN113205983B discloses a fast mechanical switch flat contact with an arc striking device, which can fix the position of an arc starting point, and achieve fast arc extinction to a certain extent. However, the arc generated by the fixed point can only be naturally extinguished to realize the disconnection, so that not only is the conductive surface easily ablated by the contact, but also the structure for fixing the position of the arc starting point is complex, the normal flow area is influenced, and the large-scale application is not possible.
Disclosure of Invention
In view of the above, the invention provides a contact structure for raising arc voltage under an external magnetic field, which is characterized in that through the cooperation of a fixed contact and a moving contact with a first metal contact lobe and a second metal contact lobe, the arc starting of the arc on the first metal contact lobe with a low melting point can be realized, the position of an arc starting point is fixed, and under the action of the external magnetic field, the arc is driven by Lorentz force to rapidly move towards the edge of the first metal contact lobe to raise the arc voltage, so that the arc is rapidly extinguished, the conductive surface is prevented from being ablated by the contact, the normal current circulation of the contact is ensured, and the breaking capacity of the contact is further improved.
The technical scheme of the invention is as follows: the contact structure for raising arc voltage under external magnetic field includes fixed contact, moving contact, conducting rod, two first metal contact lobes, several second metal contact lobes, open slot and external magnetic field; the movable contact is arranged on one side of the fixed contact and is parallel to the fixed contact, the contact surfaces of the fixed contact and the movable contact are in a flat plate shape, the non-contact surfaces of the movable contact and the fixed contact are communicated with the main circuit through conductive rods, two first metal contact flaps are symmetrically arranged on one side of the contact surfaces of the fixed contact and the movable contact, the first metal contact flaps are fixedly connected with the fixed contact and the movable contact, a plurality of second metal contact flaps are symmetrically arranged on the contact surfaces of the fixed contact and the movable contact, the second metal contact flaps are fixedly connected with the fixed contact and the movable contact, a plurality of open slots are formed by disconnecting the adjacent second metal contact flaps and the first metal contact flaps and the second metal contact flaps, the melting points of the second metal contact flaps are higher than the melting points of the first metal contact flaps, an external magnetic field is arranged on the outer sides of the fixed contact and the movable contact, a magnetic induction line of the external magnetic field penetrates through the fixed contact and the movable contact, the magnetic field direction of the external magnetic field is parallel to the open slots, and the direction of Lorentz force on the contact surfaces of the fixed contact and the movable contact faces one side of the first metal contact.
Preferably, the total number of the first metal contact leaves and the second metal contact leaves is n, the number of the open grooves is n-1, and the area of the first metal contact leaves is smaller than or equal to that of the second metal contact leaves.
Preferably, two bases are symmetrically arranged on the non-contact surfaces of the fixed contact and the movable contact, one side of each base is fixedly connected with the fixed contact and the movable contact respectively, and the other side of each base is fixedly connected with the conductive rod.
Preferably, the contact surfaces of the fixed contact and the movable contact are any one of rectangle, ellipse, circle and diamond, and the open slot is parallel to the long side of the rectangle, the ellipse and the long axis of the diamond.
Preferably, the edges of the first metal contact flap and the second metal contact flap are positioned on the inner sides of the edges of the fixed contact and the moving contact, and the outer side shapes of the first metal contact flap and the second metal contact flap are the same as the outer side shapes of the fixed contact and the moving contact.
Preferably, the external magnetic field is a permanent magnet or a coil, and the permanent magnet or the coil is fixedly arranged on the outer sides of the fixed contact and the moving contact.
Preferably, the first metal contact flap is made of any one of pure copper, pure silver and copper-silver alloy, and the second metal contact flap is made of any one of pure tungsten and copper-tungsten alloy.
Preferably, the slot pitch of the open slot is 1mm-2mm.
Compared with the prior art, the contact structure for raising the arc voltage under the external magnetic field provided by the invention has the advantages that through the cooperation of the fixed contact and the moving contact with the first metal contact lobe and the second metal contact lobe, the arc can be started on the first metal contact lobe with a low melting point, the position of an arc starting point is fixed, under the action of the external magnetic field, the arc is driven by Lorentz force to quickly move to the edge of the first metal contact lobe to raise the arc voltage, the arc is quickly extinguished, the conductive surface is prevented from being ablated by the contact, the normal current circulation of the contact is ensured, and meanwhile, the opening grooves are arranged between the adjacent second metal contact lobes and between the first metal contact lobe and the second metal contact lobe, so that the arc can jump from one contact lobe to the other contact lobe beyond the opening groove, but the movement distance of the arc is generally shortened compared with the traditional contact, and only part of the jump arc is accelerated, the unstable speed is accelerated, the arc voltage is quickly raised, and the whole breaking capacity is further enhanced; the contact structure of the invention has strong direct current open end capability, long service life and strong practicability, and is worth popularizing.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a perspective view of the present invention;
FIG. 4 is a perspective view of the present invention having the same area of the low, second metal contact lobe;
FIG. 5 is a perspective view of the present invention showing the different areas of the low and second metal contact lobes;
fig. 6 is a side view of the invention with a different area of the second metal contact flap.
Detailed Description
The present invention provides a contact structure for raising arc voltage under an external magnetic field, and the present invention will be described with reference to the schematic structural diagrams of fig. 1 to 6.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the technical solutions of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
At present, along with the continuous development of society, various energy sources are interconnected, the power industry of China is also continuously updated, the system structure and the operation mode are more complex and various, the system capacity is gradually increased, and the potential influence of short circuit hazard is huge. Thus, there is a need for a technique to reliably remove short circuit faults, and circuit breakers are key devices in power systems to remove short circuit faults. Along with the continuous development of an alternating current system, an alternating current breaker is developed to be mature, but new energy is accessed and distributed energy is developed greatly at present, a direct current system is gradually perfected, the capacity of the direct current system is gradually increased from a miniaturized locomotive direct current breaker to an ultrahigh voltage direct current transmission system breaker, the short circuit fault mode is diversified, the short circuit current rising rate is high, and the requirement on the opening of the direct current breaker is higher. Compared with the alternating current break, the direct current break has no natural zero crossing point, and has a plurality of technical difficulties.
The existing direct current breaking method comprises a forced zero crossing method, a transfer breaking method and an arc voltage increasing method, wherein the forced zero crossing method is to superimpose a reverse current on the basis of an original current to generate a zero crossing point for breaking, the transfer breaking method is to connect a transfer switch with a power electronic breaker or a fuse in parallel, the current is quickly transferred to a device connected in parallel during fault, and the arc voltage increasing method is to directly increase the arc voltage to the system voltage for direct current breaking. The requirement on the contact is high when the circuit breaker acts rapidly, so that the electric arc is required to be extinguished rapidly, the bearing capacity of the contact is high, and the service life of the contact is long.
When the direct current starting is performed by using the arc voltage increasing method, it is necessary to achieve the position fixation of the starting point and the rapid extinction of the arc. Currently, the prior patent document CN113205983B discloses a fast mechanical switch flat contact with an arc striking device, which can fix the position of an arc starting point, and achieve fast arc extinction to a certain extent. However, the arc generated by the fixed point can only be naturally extinguished to realize the disconnection, so that not only is the conductive surface easily ablated by the contact, but also the structure for fixing the position of the arc starting point is complex, the normal flow area is influenced, and the large-scale application is not possible.
Based on the problems, according to the contact structure for raising the arc voltage under the external magnetic field, through the cooperation of the fixed contact, the moving contact and the first metal contact lobe and the second metal contact lobe, the arc starting of the arc on the first metal contact lobe with a low melting point can be realized, the position of the arc starting point is fixed, and under the action of the external magnetic field, the lorentz force drives the arc to rapidly move towards the edge of the first metal contact lobe to improve the arc voltage, so that the arc is rapidly extinguished, the conductive surface is prevented from being ablated by the contact, the normal current circulation of the contact is ensured, and the breaking capacity of the contact is further improved.
Example 1
As shown in fig. 1 and 3, a contact structure for raising arc voltage under an external magnetic field comprises a fixed contact 1, a movable contact 2, a conducting rod 3, a first metal contact lobe 4, a second metal contact lobe 5 and an open slot 6; the moving contact 2 is arranged on one side of the fixed contact 1 and is parallel to each other, the contact surfaces of the fixed contact 1 and the moving contact 2 are in a flat plate shape, the non-contact surfaces of the fixed contact 1 and the moving contact 2 are communicated with a main circuit through a conducting rod 3, two first metal contact flaps 4 are symmetrically arranged on one side of the contact surfaces of the fixed contact 1 and the moving contact 2, the first metal contact flaps 4 are fixedly connected with the fixed contact 1 and the moving contact 2, a plurality of second metal contact flaps 5 are symmetrically arranged on the contact surfaces of the fixed contact 1 and the moving contact 2, the second metal contact flaps 5 are fixedly connected with the fixed contact 1 and the moving contact 2, a plurality of open slots 6 are formed by disconnecting adjacent second metal contact flaps 5 and between the first metal contact flaps 4 and the second metal contact flaps 5, the open slots 6 are parallel to each other, the melting point of the second metal contact flaps 5 is higher than the melting point of the first metal contact flaps 4, an external magnetic field is arranged on the outer side of the fixed contact 1 and the moving contact 2, the metal contact flaps with different melting points are distributed on the contact surfaces of the fixed contact, the local first metal contact flaps on the contact surfaces are enabled to be in the contact surfaces, the moving contact surfaces of the fixed contact surfaces, the moving contact surfaces of the moving contact 1 and the moving contact surfaces of the moving contact 1 are further enabled to be shorter than the metal contact 6, the number of the moving contact 6 is increased, the moving contact 6 is smaller than the moving contact 6, and the moving contact 6 can move towards the moving contact 6, and the moving contact 6 is fixed, and the moving contact 6.
When the power system breaks down, the gap temperature of the static contact and the moving contact firstly reaches the melting point temperature of the low-melting-point metal, at the moment, the low-melting-point metal is in a molten state, namely the metal is in a liquid state and a solid state coexist, when the temperature continuously rises to reach the melting point of the high-melting-point metal, the high-melting-point metal starts to be in a molten state, but at the moment, the molten part of the low-melting-point metal is more liquid metal, when the static contact and the moving contact are pulled apart, as the molten state of the high-melting-point metal is less than that of the low-melting-point metal, the liquid metal bridge of the second metal contact flap is easy to break, the length of the liquid metal bridge is longer on the first metal contact flap, the breaking time is later, the liquid metal bridge of the low-melting-point metal can be kept on until the arc starts, namely the arc can be generated on the first metal contact flap, the arcing position of the arc is fixed, the arc movement distance on the single contact flap is combined, so that the arc voltage is rapidly lifted, the arc is subjected to the action of Lorentz force under the external magnetic field, the action of the arc is promoted, the Lorentz force direction is promoted to move to the edge of the contact flap along a certain short distance on the contact flap, the arc voltage can be further rapidly lifted, and the arc ablation area is reduced.
Preferably, two bases 31 are symmetrically arranged on the non-contact surfaces of the fixed contact 1 and the movable contact 2, one side of each base 31 is fixedly connected with the fixed contact 1 and the movable contact 2 respectively, the other side of each base 31 is fixedly connected with the conductive rod 3, and the bases are used as electric connection parts of the contacts to reduce the impedance of the arc extinguishing chamber when the contacts are closed.
Preferably, the edges of the first metal contact lobe 4 and the second metal contact lobe 5 are positioned on the inner sides of the edges of the fixed contact 1 and the movable contact 2, and the outer side shapes of the first metal contact lobe 4 and the second metal contact lobe 5 are the same as the outer side shapes of the fixed contact 1 and the movable contact 2.
Preferably, the external magnetic field is a permanent magnet or a coil, the permanent magnet or the coil is fixedly arranged on the outer sides of the fixed contact 1 and the movable contact 2, and the permanent magnet or the coil can drive the electric arc on the first metal contact flap to move towards the edge of the contact flap, so that the moving speed of the electric arc is improved.
Preferably, the first metal contact flap 4 is made of any one of pure copper, pure silver and copper-silver alloy, and the second metal contact flap 5 is made of any one of pure tungsten and copper-tungsten alloy.
Preferably, the slot distance of the open slot 6 is 1mm-2mm, the metal contact blades and the open slot are similar to a grid structure, the width of each contact blade is shortened by adopting the structure, the distance that an arc moves in the direction of being subjected to Lorentz force is further shortened, the arc is promoted to move to an edge, the arc voltage is accelerated, when an arc transition phenomenon occurs, the greater the slot distance of the open slot, the arc is less likely to transition from one metal contact blade to the other metal contact blade, but the open slot is only used as a boundary line of metal contact blades with different melting points, the slot distance is not too large, otherwise, the through-flow effect is affected, and the slot distance of an open small slot is generally smaller and is about 1mm-2mm.
Example 2
To further enhance the overall breaking capability of the contact, the arc may transition from one contact lobe to the other contact lobe across the open slot through the open slot provided between adjacent second metal contact lobes and between the first metal contact lobe and the second metal contact lobe, but generally the arc movement distance is shorter than that of a conventional contact and only a portion of the transition arc accelerates the unstable speed, resulting in a rapid increase in arc voltage.
Preferably, the total number of the first metal contact blades 4 and the second metal contact blades 5 is n, the number of the open slots 6 is n-1, the area of the first metal contact blade 4 is smaller than or equal to the area of the second metal contact blade 5, and the distribution ratio of the areas of the metal blades with different melting points and the open slots can be changed when the number or the positions of the open slots are changed; if two metal contact leaves and one open slot exist, the position of the open slot can be 1/2, 1/3 and 1/4 of the whole contact piece, the area ratio of the high melting point to the first metal contact leaf is determined to be 1:1, 2:1 and 3:1, the arc moving distance on the single contact leaf can be effectively reduced by reducing the area of the single metal contact leaf, the speed of arc moving to the edge is improved, but due to the Lorentz force, partial arc still moves from one metal contact leaf to the other melting point metal contact leaf across the open slot, but only partial arc moves, so that the arc moving distance is still reduced much more than that of the traditional contact structure, the arc can be quickly moved to the contact edge, the arc is accelerated to extinguish, and the unstable speed of the arc is quickened by only part of the moving arc, so that the arc voltage is quickly increased.
Example 3
In order to further improve the speed of arc extinction, through the contact surface of multiple shape, the different use scenes of convenient application to open slot is parallel to each other with the long limit of rectangle, ellipse and the major axis of rhombus, can effectively shorten the width of single contact lamella minor axis direction, makes the electric arc travel distance shorten, promotes the electric arc voltage more easily.
Preferably, the contact surface of the fixed contact 1 and the moving contact 2 is any one of rectangle, ellipse, circle and diamond, the open slot 6 is parallel to the long side of the rectangle, ellipse and long axis of the diamond, the contact surface has a plurality of shapes, each shape has a longer line and a shorter line, such as the length and width of the rectangle, the long axis, the short axis, the long axis and the short axis of the diamond, the arc formed by the gap of the contact can move along the lorentz force direction when the contact is pulled, the lorentz force is parallel to the contact plane and perpendicular to the current direction because the external magnetic field direction is parallel to the contact plane, and the lorentz force direction is adjustable according to the current direction and the magnetic field direction, but mainly promotes the arc to move to the contact edge along a certain shorter distance, and the distance from the arc to the contact edge is shorter than that of a common contact at the moment, so that the arc voltage can be quickly lifted.
As shown in fig. 2, the cross section of the contact structure is actually rectangular with inconsistent length and width, the horizontal direction is rectangular long, the vertical direction is rectangular wide, the contact blade is divided into two parts along the vertical direction, the second metal contact flap and the first metal contact flap occupy half, the boundary of the two metal contact flaps is an open small groove, and the width of each metal contact flap is half of the width before being divided.
The direction of the applied external magnetic field is from left to right in the horizontal direction, the direction of the current is inward, at the moment, the Lorentz force generated for the whole contact is vertically upward, the movement direction of the electric arc is forced to be upward, namely, the electric arc is vertically upward, compared with the movement to the edge along the horizontal direction, the movement distance of the electric arc is obviously reduced along the vertical direction, under the structure, when the condition that the electric arc is transited from one metal contact lobe to the other metal contact lobe along the Lorentz force direction exists, the transition distance of the whole transition direction is rectangular, the distance is shorter, and only part of electric arc is transited, compared with the traditional contact, the electric arc has the advantage of accelerating the movement to the edge of the contact, and the electric arc voltage can be quickly improved.
As shown in fig. 4, 5 and 6, the contact structure for raising arc voltage under an external magnetic field of the present invention comprises a first metal contact lobe 4, a high-melting metal lobe 5, and two small open slots 6 between the metal lobes. The contact surface is circular, and is divided into three contact petals and two open slots along a certain diameter direction, the area distribution ratio of the second metal contact petals to the first metal contact petals is 3:1, the direction of an external magnetic field is perpendicular to the direction of the split contact petals, at the moment, the external magnetic field is caused to be parallel to the horizontal direction, the Lorentz force is in the vertical direction, and the electric arc is caused to move upwards or downwards to the edge of the contact. If the upward moving distance of the arc on the first metal contact lobe 4 is 1/4 of the original contact surface of the whole contact, the upward moving distance of the upper high-melting-point metal lobe 5 is 1/2 of the original contact surface of the whole contact, and the upward moving distance of the lower high-melting-point metal lobe 5 is 1/4 of the original contact surface of the whole contact, the distance from the arc to the edge is reduced as a whole, so that the arc can be quickly elongated, the arc voltage is increased, and meanwhile, the arcing probability of the arc on the contact lobe is increased due to the first metal contact lobe 4, so that the ablation area of the whole contact plane is reduced.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations within the scope of the present invention will be apparent to those skilled in the art.
Claims (8)
1. A contact structure for increasing arc voltage under an external magnetic field, comprising: the static contact (1), moving contact (2) set up one side of static contact (1) and be parallel to each other, the contact surface of static contact (1) and moving contact (2) is the platy, and its non-contact surface passes through conducting rod (3) and main circuit intercommunication, its characterized in that still includes:
the two first metal contact flaps (4) are symmetrically arranged on one side of the contact surface of the fixed contact (1) and the movable contact (2), and the first metal contact flaps (4) are fixedly connected with the fixed contact (1) and the movable contact (2);
the second metal contact petals (5) are symmetrically arranged on the contact surface of the fixed contact (1) and the movable contact (2), the second metal contact petals (5) are fixedly connected with the fixed contact (1) and the movable contact (2), a plurality of open slots (6) are formed by disconnecting adjacent second metal contact petals (5) and the first metal contact petals (4) and the second metal contact petals (5), the open slots (6) are parallel to each other, and the melting point of the second metal contact petals (5) is higher than that of the first metal contact petals (4);
the external magnetic field is arranged on the outer sides of the fixed contact (1) and the moving contact (2), magnetic induction lines of the external magnetic field penetrate through the fixed contact (1) and the moving contact (2), the magnetic field direction of the external magnetic field is parallel to the opening groove (6), and the Lorentz force direction on the contact surface of the fixed contact (1) and the moving contact (2) faces to one side of the first metal contact flap (4).
2. A contact structure for increasing arc voltage under external magnetic field according to claim 1, characterized in that the total number of the first metal contact flaps (4) and the second metal contact flaps (5) is n, the number of the open slots (6) is n-1, and the area of the first metal contact flaps (4) is smaller than or equal to the area of the second metal contact flaps (5).
3. The contact structure for raising arc voltage under external magnetic field according to claim 1, wherein two bases (31) are symmetrically arranged on non-contact surfaces of the fixed contact (1) and the movable contact (2), one side of the base (31) is fixedly connected with the fixed contact (1) and the movable contact (2) respectively, and the other side is fixedly connected with the conductive rod (3).
4. The contact structure for raising arc voltage under external magnetic field according to claim 1, wherein the contact surface of the fixed contact (1) and the moving contact (2) is any one of rectangle, ellipse, circle and diamond, and the open slot (6) is parallel to the long side of the rectangle, ellipse and long axis of the diamond.
5. The contact structure for raising arc voltage under external magnetic field according to claim 1, wherein the edges of the first metal contact flap (4) and the second metal contact flap (5) are located inside the edges of the fixed contact (1) and the movable contact (2), and the outer side shapes of the first metal contact flap (4) and the second metal contact flap (5) are the same as the outer side shapes of the fixed contact (1) and the movable contact (2).
6. The contact structure for raising arc voltage under external magnetic field according to claim 1, wherein the external magnetic field is a permanent magnet or a coil, and the permanent magnet or the coil is fixedly arranged at the outer sides of the fixed contact (1) and the movable contact (2).
7. The contact structure for raising arc voltage under external magnetic field according to claim 1, wherein the material of the first metal contact flap (4) is any one of pure copper, pure silver and copper-silver alloy, and the material of the second metal contact flap (5) is any one of pure tungsten and copper-tungsten alloy.
8. A contact structure for raising the arc voltage under an external magnetic field according to claim 1, characterized in that the slot pitch of the open slot (6) is 1mm-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310290378.9A CN116313676A (en) | 2023-03-23 | 2023-03-23 | Contact structure for raising arc voltage under external magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310290378.9A CN116313676A (en) | 2023-03-23 | 2023-03-23 | Contact structure for raising arc voltage under external magnetic field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116313676A true CN116313676A (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310290378.9A Pending CN116313676A (en) | 2023-03-23 | 2023-03-23 | Contact structure for raising arc voltage under external magnetic field |
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| Country | Link |
|---|---|
| CN (1) | CN116313676A (en) |
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2023
- 2023-03-23 CN CN202310290378.9A patent/CN116313676A/en active Pending
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