Vacuum arc-extinguishing chamber contact and vacuum arc-extinguishing chamber
By incorporating a combination of flat, inclined, and arc surfaces in the contact design of the vacuum interrupter, and by setting a boss and groove mating structure on the top of the contact, the problem of the arc initiation point coinciding with the point of strongest electric field is solved, thereby improving the insulation performance and electrical life of the interrupter.
Patent Information
- Application Number
- CN202423307364.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The arc initiation point of the contacts in existing vacuum interrupters coincides with the point of strongest electric field, leading to frequent partial discharge phenomena and affecting the withstand voltage performance and electrical life of the interrupter.
The top structure of the moving and stationary contacts is designed as a combination of flat, inclined and arc surfaces. The arc initiation position is separated from the position of strongest electric field. A boss and groove are set on the top of the contact to increase the contact area and stability.
It effectively avoids excessive concentration of local electric fields, reduces the probability of partial discharge, improves the insulation performance and withstand voltage of the arc-extinguishing chamber, extends the service life of the contacts, and reduces equipment maintenance costs.
Smart Images
Figure CN223884352U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of vacuum arc extinguishing chamber, concretely relates to a vacuum arc extinguishing chamber contact and vacuum arc extinguishing chamber. BACKGROUND
[0002] Vacuum arc extinguishing chamber as the core component of high voltage power switch, its performance directly influences the safe and reliable operation of power system. Contact is the key part of vacuum arc extinguishing chamber, is responsible for conducting and breaking current. When the contact is connected, the current is transmitted through the contact, when the current needs to be broken, the contact is separated, realizes the opening of circuit.
[0003] At present, the structure of the top of the contact of the vacuum arc extinguishing chamber is plane plus edge rounding, the maximum electric field position of the whole arc extinguishing chamber is the connecting place of the contact plane and rounding, and the place is the last separation point when the contact is disconnected (i.e. the arcing position in the breaking process), and the local discharge phenomenon is easily caused, the local discharge not only will waste electric energy, and long-term accumulation will cause irreversible damage to the insulating material of the arc extinguishing chamber, reduces the overall insulating property of the arc extinguishing chamber, causes the place to become the weak point of insulation of the whole arc extinguishing chamber, and the reignition is easily caused from the place in the breaking process of the arc extinguishing chamber, influences the withstand voltage performance and electrical life of the arc extinguishing chamber. SUMMARY
[0004] The utility model wants to solve the technical problem that the arcing point of the prior art contact coincides with the maximum electric field point of the arc extinguishing chamber, and the local discharge phenomenon may occur, the reignition occurs at the arcing point, influences the withstand voltage performance and electrical life of the arc extinguishing chamber, and the purpose lies in providing a vacuum arc extinguishing chamber contact and vacuum arc extinguishing chamber, so that the arcing position and the strongest electric field position are not in the same position, the local electric field can be effectively avoided from excessive concentration, the occurrence probability of the local discharge phenomenon is reduced, the insulating property of the arc extinguishing chamber is ensured, and then the withstand voltage performance and electrical life of the arc extinguishing chamber are ensured.
[0005] The utility model realizes the following technical scheme:
[0006] A vacuum arc-extinguishing chamber contact includes a moving contact and a static contact, the moving contact is cylindrical, the top of the moving contact is provided with a first plane and a first inclined surface, the first inclined surface is connected around the edge of the first plane, the first inclined surface and the side wall of the moving contact are connected through a first circular arc surface, the first plane and the first inclined surface form a first undulating position which is an arc starting position, the first inclined surface and the first circular arc surface form a second undulating position which is the strongest electric field position, the first plane is provided with a positioning structure; the static contact is cylindrical, the top of the static contact is provided with a second plane and a second inclined surface, the second inclined surface is connected around the edge of the second plane, the second inclined surface and the side wall of the moving contact are connected through a circular arc surface, the second plane and the second inclined surface form a third undulating position which is an arc starting position, the second inclined surface and the second circular arc surface form a fourth undulating position which is the strongest electric field position, the second plane is provided with a matching structure matched with the positioning structure.
[0007] The utility model discloses beneficial effects are, through being provided with plane, inclined surface and circular arc surface at the top of contact (moving contact and static contact), facilitate when contact breaking, the inclined surface and the plane connection place is arc starting position, the inclined surface and the circular arc surface connection place is the strongest electric field position, make arc starting position and the strongest electric field position not in the same position, can effectively avoid local electric field excessive concentration, reduce local discharge occurrence probability, guarantee arc-extinguishing chamber insulation performance stability, improve its withstand high voltage ability, also make the ablation effect of arc to contact relatively dispersed, reduce the damage degree of contact material at the arc starting point, thereby prolong the service life of contact, reduce equipment maintenance and replacement cost, ensure that arc-extinguishing chamber's pressure resistance performance and electrical life.
[0008] In some embodiments, the first inclined surface and the first plane form an angle of 3° to 5°, and the second inclined surface and the second plane form the same angle as the first inclined surface and the first plane. On the premise of ensuring that the arc starting position and the strongest electric field position are not in the same place, the breaking performance of the arc-extinguishing chamber is ensured.
[0009] In some embodiments, the radius of the first circular arc surface is 6mm to 12mm, and the radius of the second circular arc surface is the same as that of the first circular arc surface. To meet the smooth transition requirement of the electric field, further avoid local electric field concentration.
[0010] In some embodiments, the first plane and the second plane are both circular, the diameter of the first plane is the same as that of the second plane, the width of the first inclined surface is the same as that of the second inclined surface, and the width of the first inclined surface is 0.6 to 0.9 times the radius of the first plane. To facilitate the arc generated at the arc starting point to move along the direction of the inclined surface at the moment of contact breaking, avoid the arc from concentrating at the center position of the contact, and be conducive to the rapid diffusion and cooling of the arc.
[0011] In some embodiments, the matching structure is a groove provided on the top of the static contact, and the positioning structure is a protrusion provided on the top of the movable contact, and the protrusion matches with the groove in the state that the movable contact communicates with the static contact. By matching the protrusion and the groove on the top of the movable and static contacts, the actual contact area when the movable and static contacts contact is significantly increased, compared with the plane contact, the concave-convex matching structure increases the contact area between the movable and static contacts, effectively reduces the contact resistance, thereby reducing the heat loss generated by the contact resistance, and improving the conductivity and current carrying capacity of the contact. In addition, the concave-convex matching can effectively prevent the relative displacement of the movable and static contacts due to vibration, electric force and other factors during operation, and enhance the stability of the contact.
[0012] In some embodiments, the cross section of the groove and the protrusion is quadrangular. The cross section of the protrusion is also quadrangular. By setting the cross section of the protrusion and the groove as a quadrangular structure, the edges of the quadrangular protrusion and the edges of the quadrangular groove can support each other when the arc extinguishing chamber is subjected to external vibration, effectively resisting the displacement and loosening caused by vibration, ensuring that the contact can still maintain good contact in a vibrating environment. In addition, due to the symmetry and regularity of the quadrangular structure, the degree of electric field distortion is reduced, and the quadrangular groove and the protrusion are matched to optimize the electric field distribution, smooth the electric field lines, and improve the insulation reliability of the arc extinguishing chamber.
[0013] In some embodiments, the height of the protrusion is less than the depth of the groove. By setting the height of the protrusion to be less than the depth of the groove, a gap is formed between the protrusion and the groove when they are matched, which can make the electric field distribution more uniform, and also reduce the heat generated by the contact resistance, thereby inhibiting the heat accumulation at the contact position.
[0014] In some embodiments, the material of the movable and static contacts is copper-chromium alloy. The contact made of copper-chromium alloy material can ensure low loss during large current transmission, thereby maintaining stable operation of the system.
[0015] The utility model discloses still provide a kind of vacuum arc-extinguishing chamber, including above-mentioned vacuum arc-extinguishing chamber contact, static conducting pole, dynamic conducting pole, main shield and two porcelain shells, two the porcelain shell is connected at the both ends of the main shield respectively and forms the shell body of cylindrical shape, the both ends of the shell body are connected with sealing plate respectively, one end of the static conducting pole is fixedly connected with the bottom of the static contact, one end of the dynamic conducting pole is fixedly connected with the bottom of the dynamic contact, the other end of the static conducting pole is fixedly connected with corresponding sealing plate, the other end of the dynamic conducting pole is slidably connected with corresponding sealing plate.It can avoid local electric field excessive concentration, reduce local discharge occurrence probability, guarantee arc-extinguishing chamber insulation performance stable, improve its withstand high voltage ability, also make arc ablation effect of contact relatively dispersed, reduce the damage degree of contact material at arcing point, thereby prolong the service life of contact, reduce equipment maintenance and replacement cost, ensure the withstand voltage performance and electrical life of arc-extinguishing chamber.
[0016] In some embodiments, one end of the bellows is sealingly connected to the dynamic conducting pole, the other end is sealingly connected to the sealing plate through which the dynamic conducting pole passes, and the two suspension shields are respectively connected to the inner side of the corresponding porcelain shell, and the suspension shield is connected to the porcelain shell through a support. By providing a suspension shield in the vacuum arc-extinguishing chamber, the electric field distribution is optimized, local discharge is reduced, insulation performance is improved, and internal components are protected.
[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0018] 1. The arcing position and the strongest electric field position are not at the same position, which can effectively avoid local electric field excessive concentration, reduce local discharge occurrence probability, guarantee arc-extinguishing chamber insulation performance stable, improve its withstand high voltage ability, also make arc ablation effect of contact relatively dispersed, reduce the damage degree of contact material at arcing point, thereby prolong the service life of contact, reduce equipment maintenance and replacement cost, ensure the withstand voltage performance and electrical life of arc-extinguishing chamber.
[0019] 2. By setting the width of the inclined plane to 0.6-0.9 times the radius of the plane, the arc generated at the arcing point can move along the inclined plane direction at the moment of contact breaking, avoiding the concentration of arc at the center of the contact, which is beneficial to the rapid diffusion and cooling of the arc.
[0020] 3. By setting the boss on the top of the dynamic and static contacts and the groove in cooperation, the actual contact area when the dynamic and static contacts are in contact is significantly increased, compared with flat contact, the concave-convex structure increases the contact area between the dynamic and static contacts, effectively reduces the contact resistance, thereby reducing the heat loss caused by contact resistance, and improving the conductivity and current-carrying capacity of the contact.
[0021] 4. By setting the cross section of the convex and concave as quadrilateral structure, it is convenient for the convex edge and the concave edge of the quadrilateral to support each other when the arc-extinguishing chamber is vibrated by external vibration, effectively resisting displacement and loosening caused by vibration, ensuring that the contact can still maintain good contact in the vibration environment, and due to the symmetry and regularity of the quadrilateral structure, the degree of electric field distortion is reduced, and the concave and convex of the quadrilateral cross section are matched to optimize the electric field distribution, smooth the electric field line, and improve the insulation reliability of the arc-extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS
[0022] The drawings described herein are used to provide further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:
[0023] Figure 1 is a central sectional view of the vacuum arc-extinguishing chamber in the present application;
[0024] Figure 2 is a structure diagram of the moving contact in the present application;
[0025] Figure 3 is a structure diagram of the static contact in the present application.
[0026] Markings in the drawings and corresponding names of parts:
[0027] Moving conducting rod 10, corrugated pipe 20, porcelain shell 30, suspended shield 40, main shield 50, static conducting rod 70, moving contact 901, static contact 902, first plane 91, first inclined plane 92, first circular arc surface 93, second plane 911, second inclined plane 921, second circular arc surface 931, convex 94, concave 95, first undulating position 96, second undulating position 961, third undulating position 97, fourth undulating position 971. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with embodiments and drawings, and the schematic embodiments and their descriptions of the present application are only used to explain the present application, and do not constitute a limitation on the present application.
[0029] Reference throughout this specification to "one embodiment", "an embodiment", "one design", or "a design" means that a particular feature, structure, or characteristic described in connection with the embodiment or design is included in at least one embodiment of the application. Therefore, appearances of the phrases "in one embodiment", "in an embodiment", "in one design", or "in a design" in various places throughout this specification are not necessarily all referring to the same embodiment or design. Furthermore, the particular features, structures, or characteristics can be combined in any suitable
[0030] In the description of the present application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.
[0031] The terms "first", "second", and the like used in the present application are only for the purpose of distinguishing the corresponding components for the sake of clear description, and do not intend to limit any order or emphasize importance. In addition, the term "connection" used herein can be directly connected or indirectly connected via other components without special description.
[0032] Example 1
[0033] Referring to Figures 1-3The embodiment 1 provides a vacuum arc-extinguishing chamber contact, comprising a moving contact 901 and a static contact 902, the moving contact 901 is cylindrical, the top of the moving contact 901 is provided with a first plane 91 and a first inclined plane 92, the first inclined plane 92 is connected around the edge of the first plane 91, the first inclined plane 92 is connected with the side wall of the moving contact 901 through a first circular arc surface 93, the first plane 91 and the first inclined plane 92 form a first undulating position 96 (the intersection of the first plane 91 and the first inclined plane 92) which is an arc starting position, the first inclined plane 92 and the first circular arc surface 93 form a second undulating position 961 (the intersection of the first inclined plane 92 and the first circular arc surface 93) which is a position with the strongest electric field, and the first plane 91 is provided with a positioning structure; the static contact 902 is cylindrical, the top of the static contact 902 is provided with a second plane 911 and a second inclined plane 921, the second inclined plane 921 is connected around the edge of the second plane 911, the second inclined plane 921 is connected with the side wall of the moving contact 901 through a circular arc surface, the second plane 911 and the second inclined plane 921 form a third undulating position 97 (the intersection of the second plane 911 and the second inclined plane 921) which is an arc starting position, the second inclined plane 921 and the second circular arc surface 931 form a fourth undulating position 971 (the intersection of the second inclined plane 921 and the second circular arc surface 931) which is a position with the strongest electric field, and the second plane 911 is provided with a matching structure matched with the positioning structure. The arc starting position and the position with the strongest electric field are not in the same position, the local electric field can be effectively avoided from being excessively concentrated, the probability of local discharge is reduced, the insulation performance of the arc-extinguishing chamber is stable, and then the withstand voltage performance and the electrical life of the arc-extinguishing chamber are ensured.
[0034] Referring to Figures 2-3 , the included angle between the first inclined plane 92 and the first plane 91 is 3-5°, and the included angle between the second inclined plane 921 and the second plane 911 is the same as the included angle between the first inclined plane 92 and the first plane 91. On the premise of ensuring that the arc starting position and the position with the strongest electric field are not in the same place, the breaking performance of the arc-extinguishing chamber is ensured.
[0035] Referring to Figures 2-3 , the radius of the first circular arc surface 93 is 6-12 mm, and the radius of the second circular arc surface 931 is the same as that of the first circular arc surface 93. The electric field is smoothly transitioned, and the local electric field is further avoided from being concentrated.
[0036] Referring to Figures 2-3The first plane 91 and the second plane 911 are both circular, the diameter of the first plane 91 is the same as the diameter of the second plane 911, the width of the first inclined surface 92 is the same as the width of the second inclined surface 921, and the width of the first inclined surface 92 is 0.6-0.9 times the radius of the first plane 91. The arc generated at the arcing point moves along the direction of the inclined surface at the moment of contact breaking, so that the arc is prevented from concentrating at the center of the contact, and the arc is facilitated to spread and cool quickly.
[0037] Referring to Figures 2-3 The fitting structure is a groove 95 arranged at the top of the static contact 902, the positioning structure is a boss 94 arranged at the top of the moving contact 901, and the boss 94 is fitted with the groove 95 in the state that the moving contact 901 communicates with the static contact 902. The actual contact area when the moving contact and the static contact 902 are in contact is significantly increased by fitting the boss 94 and the groove 95 arranged at the top of the moving contact and the static contact 902, the contact area between the moving contact and the static contact 902 is increased by the concave-convex fitting structure, the contact resistance is effectively reduced, the heat loss generated by the contact resistance is reduced, and the conductivity and current-carrying capacity of the contact are improved. The relative displacement of the moving contact and the static contact 902 caused by vibration, electromagnetic force and other factors during operation is effectively prevented by the concave-convex fitting, and the stability of the contact is improved.
[0038] Referring to Figures 2-3 The cross section of the groove 95 is quadrangular, and the cross section of the boss 94 is also quadrangular. The edges of the quadrangular boss 94 and the edges of the quadrangular groove 95 support each other when the arc-extinguishing chamber is vibrated, the displacement and looseness caused by vibration are effectively resisted, the contact can still maintain good contact in a vibrating environment, the symmetry and regularity of the quadrangular structure reduce the degree of electric field distortion, the groove 95 with a quadrangular cross section is fitted with the boss 94 to optimize the electric field distribution, smooth the electric field lines, and improve the insulation reliability of the arc-extinguishing chamber.
[0039] Referring to Figures 2-3 The height of the boss 94 is less than the depth of the groove 95. When the boss 94 is fitted with the groove 95, a gap is formed between the boss 94 and the groove 95, the electric field distribution is more uniform, the heat generated by the contact resistance is reduced, and the accumulation of heat at the contact position is inhibited.
[0040] Referring to Figures 2-3, specifically, the difference between the height of the protrusion 94 and the depth of the groove 95 in the low voltage level (1kV-35kV) vacuum arc-extinguishing chamber is usually in the range of 0.5-2mm, and the difference between the height of the protrusion 94 and the depth of the groove 95 in the high voltage level (110kV and above) vacuum arc-extinguishing chamber is usually in the range of 2-5mm.
[0041] Referring to Figures 2-3 The contact body 90 is made of copper-chromium alloy. The contact made of copper-chromium alloy can ensure low loss during large current transmission, thereby maintaining stable operation of the system.
[0042] Embodiment 2
[0043] Referring to Figure 1 The embodiment 2 provides a vacuum arc-extinguishing chamber comprising the above-mentioned vacuum arc-extinguishing chamber contact, a static conducting rod 70, a dynamic conducting rod 10, a main shielding 50 and two porcelain shells 30. The two porcelain shells 30 are respectively connected to the two ends of the main shielding 50 and form a cylindrical shell. The two ends of the shell are respectively connected with sealing plates. One end of the static conducting rod 70 is fixedly connected with the bottom of the static contact 902, and one end of the dynamic conducting rod 10 is fixedly connected with the bottom of the dynamic contact 901. The other end of the static conducting rod 70 is fixedly connected with the corresponding sealing plate, and the other end of the dynamic conducting rod 10 is slidably connected with the corresponding sealing plate. The local electric field can be avoided from being excessively concentrated, the probability of local discharge can be reduced, the insulation performance of the arc-extinguishing chamber can be stabilized, the high voltage resistance of the arc-extinguishing chamber can be improved, the ablation of the arc to the contact is relatively dispersed, the damage degree of the contact material at the arc starting point is reduced, the service life of the contact is prolonged, the equipment maintenance and replacement cost is reduced, and the pressure resistance and electrical life of the arc-extinguishing chamber are ensured.
[0044] Referring to Figure 1 One end of the bellows 20 is sealingly connected to the dynamic conducting rod 10, and the other end is sealingly connected with the sealing plate through which the dynamic conducting rod 10 passes. The two suspension shields 40 are respectively connected to the inner side of the corresponding porcelain shell 30, and the suspension shield 40 is connected with the porcelain shell 30 through a support. The suspension shield is arranged in the vacuum arc-extinguishing chamber to optimize the electric field distribution, reduce the local discharge, improve the insulation performance and protect the internal components.
[0045] The above-mentioned specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above-mentioned specific embodiments are only specific embodiments of the utility model and are not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A vacuum interrupter contact, characterized by, The utility model relates to a vacuum interrupter, and particularly to a vacuum interrupter contact. The utility model discloses a vacuum interrupter contact, which comprises a moving contact and a stationary contact. The moving contact is cylindrical, and the top of the moving contact is provided with a first plane and a first inclined surface.
2. The vacuum interrupter contact of claim 1, wherein The first inclined surface is connected around the edge of the first plane, and the first inclined surface and the side wall of the moving contact are connected through a first circular arc surface.
3. The vacuum interrupter contact of claim 1, wherein, The first plane and the first inclined surface form a first undulating position, which is an arc starting position.
4. The vacuum interrupter contact of claim 1, wherein, The first inclined surface and the first circular arc surface form a second undulating position, which is the strongest electric field position.
5. The vacuum interrupter contact of claim 1, wherein, The first plane is provided with a positioning structure.
6. The vacuum interrupter contact of claim 5 wherein, The stationary contact is cylindrical, and the top of the stationary contact is provided with a second plane and a second inclined surface.
7. The vacuum interrupter contact of claim 6 wherein, The second inclined surface is connected around the edge of the second plane, and the second inclined surface and the side wall of the moving contact are connected through a second circular arc surface.
8. The vacuum interrupter contact according to any of claims 1-7, characterized in that The second plane and the second inclined surface form a third undulating position, which is an arc starting position.
9. A vacuum interrupter, characterized by The second inclined surface and the second circular arc surface form a fourth undulating position, which is the strongest electric field position.
10. The vacuum interrupter of claim 9, wherein, The second plane is provided with a matching structure matched with the positioning structure. The angle between the first inclined surface and the first plane is 3-5°. The angle between the second inclined surface and the second plane is the same as the angle between the first inclined surface and the first plane. The radius of the first circular arc surface is 6-12 mm. The radius of the second circular arc surface is the same as the radius of the first circular arc surface. The first plane and the second plane are both circular. The diameter of the first plane is the same as the diameter of the second plane. The width of the first inclined surface is 0.6-0.9 times the radius of the first plane. The matching structure is a groove provided on the top of the stationary contact. The positioning structure is a boss provided on the top of the moving contact. In the state that the moving contact and the stationary contact are in communication, the boss and the groove are matched. The cross section of the groove and the boss is quadrilateral. The height of the boss is less than the depth of the groove. The material of the moving contact and the stationary contact is copper-chromium alloy. The utility model discloses a vacuum interrupter contact, a static conducting rod, a moving conducting rod, a main shielding and two porcelain shells. The two porcelain shells are connected at the two ends of the main shielding and form a cylindrical shell body. The two ends of the shell body are connected with sealing plates respectively. One end of the static conducting rod is fixedly connected with the bottom of the stationary contact. One end of the moving conducting rod is fixedly connected with the bottom of the moving contact. The other end of the static conducting rod is fixedly connected with the corresponding sealing plate. The other end of the moving conducting rod is slidably connected with the corresponding sealing plate. The utility model further discloses a bellows and two suspension shieldings. One end of the bellows is sealingly connected with the moving conducting rod, and the other end is sealingly connected with the sealing plate through which the moving conducting rod passes. The two suspension shieldings are connected with the inner side of the corresponding porcelain shell respectively. The suspension shielding and the porcelain shell are connected through a support.