Gas-insulated metal-enclosed switch device
By adopting a copper-tungsten alloy contact block and a cutting seam design for the moving and stationary contact structures in the GIS device, combined with a shielding cover, the problem of complex assembly was solved, achieving simple assembly and low-cost gas-insulated metal-enclosed switches, thus improving the reliability and stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-03-24
AI Technical Summary
The existing GIS disconnect switches and grounding switches have complex assembly structures and many parts, resulting in high assembly difficulty and cost.
The moving and stationary contact structure, which adopts copper-tungsten alloy contact blocks and cutting seams, combined with a shielding cover, optimizes the opening and closing process of the contacts. The inclined surface and arc-shaped protrusions of the copper-tungsten alloy contact blocks provide contact pressure and guidance, simplifying the assembly process.
This invention realizes a gas-insulated metal-enclosed switchgear with simple structure, easy assembly, and low cost, which improves the reliability and stability of the equipment, extends the service life of the contacts, and reduces the erosion effect of electric arc on the contacts.
Smart Images
Figure CN224036243U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of electrical switch, concretely is a kind of gas insulated metal-enclosed switchgear. BACKGROUND
[0002] SF6 gas insulated metal-enclosed switchgear (abbreviation GIS) is the component device such as circuit breaker, disconnecting switch, grounding switch is combined and enclosed in the technical shell of ground, compared with air-insulated switchgear, with good performance, small footprint, strong environmental adaptability, less operation and maintenance advantages, therefore since advent, obtain vigorous development.
[0003] Disconnecting switch in GIS has the function of connecting and disconnecting live circuit, and grounding switch has the function of grounding GIS equipment. Disconnecting switch needs to have the ability to cut off busbar transfer current, busbar charging current and capacitive induced current in actual use. Grounding switch has the ability to cut off induced current (static electricity, electromagnetic) in GIS equipment and short-circuit current in closed circuit.
[0004] Disconnecting switch is a kind of switch device mainly used for "isolating power supply, switching operation, connecting and cutting off small current circuit", without arc extinguishing function. When disconnecting switch is in the position, there is a specified insulation distance and obvious disconnecting mark between contacts; when it is in the closed position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time.
[0005] At present, the contact assembly structure of GIS disconnecting switch and grounding switch is complex, and there are many parts, including shielding cover, arc guide ring, arc guide contact, conductive contact, clamping spring and moving contact. The structure of arc guide contact and conductive contact is integrated into one part, and the contact pressure is provided by external clamping spring, which leads to complex overall structure, high assembly difficulty and high cost. INVENTION CONTENTS
[0006] To solve the problems of high assembly difficulty and complex structure, the utility model provides a gas insulated metal-enclosed switchgear with simple structure and convenient assembly.
[0007] The utility model is realized by the following technical solutions:
[0008] A kind of gas insulated metal-enclosed switchgear, including the moving contact and static contact of opposite arrangement and being copper, the plug-in end of the moving contact is equipped with copper-tungsten alloy contact block one, the access end of the static contact is equipped with copper-tungsten alloy contact block two, which can abut copper-tungsten alloy contact block one when the moving contact and static contact are inserted or separated;
[0009] The abutment surface of at least one of the copper-tungsten alloy contact block one and the copper-tungsten alloy contact block two is inclined.
[0010] The static contact is provided with cutting slots in the circumferential direction, the cutting slots extend along the access direction of the static contact, and one end of the cutting slot close to the access end is communicated with the outside; the cutting slots divide the static contact into a plurality of finger petals.
[0011] The two copper-tungsten alloy contact blocks can resist arc ablation when approaching; the finger petals separated by the cutting slots provide contact pressure by using their own deformation after closing, the static contact structure is very simple, the product has small overall size and low cost, and the competitiveness of the equipment is improved.
[0012] Further improvement of the utility model still has, the abutting surface of copper-tungsten alloy contact block one and copper-tungsten alloy contact block two is inclined surface. Two abutting surfaces are inclined surface further optimize the opening and closing process of moving contact and static contact. When closing, the copper-tungsten alloy part of the front end of moving contact and static contact can break down and contact more quickly and stably, accelerate the generation and extinguishing process of arc, and more smoothly realize the transition of contact point from copper-tungsten part to copper part. When opening, the transition of contact point can be more accurately controlled, ensure that arc continuously and stably ablates in copper-tungsten alloy part, further reduce the influence of arc on other parts of contact, improve the performance and service life of contact in all directions, and enhance the reliability and stability of equipment.
[0013] Further improvement of the utility model still has, the angle between the abutting surface of copper-tungsten alloy contact block one and vertical surface is 42.5 °, and the angle between the abutting surface of copper-tungsten alloy contact block two and vertical surface is 15 °. The specific angle designed accurately makes the interaction between copper-tungsten alloy contact blocks more reasonable in the opening and closing process of moving contact and static contact. When closing, the angle setting can make the copper-tungsten alloy part of the front end of moving contact and the copper-tungsten alloy part of the front end of static contact break down at appropriate time, and in subsequent closing action, the transition of contact point is more stable and rapid, effectively shortens the time of arc existence, and reduces the ablation degree of arc on contact. When opening, the specific angle can ensure that the transition of contact point is more orderly in the separation process of moving contact and static contact, the ablation of arc in copper-tungsten alloy part is more stable, the main conduction area of contact is protected to the maximum extent, and the performance and reliability of equipment are improved. The accurate angle design is obtained through a large number of experiments and theoretical analysis, and can significantly improve the overall performance of product.
[0014] Further improvement of the utility model still has, the thickness of copper-tungsten alloy contact block one in the direction of insertion is 1.8 mm, and the thickness of copper-tungsten alloy contact block two in the direction of insertion is 2.7 mm. The thickness of copper-tungsten alloy contact block designed reasonably ensures that the contact block has sufficient material reserve when bearing arc ablation, and also considers the compactness of overall structure.
[0015] The further improvement of the utility model still has, the inner wall of the static contact head close to the two ends of the copper-tungsten alloy contact block is equipped with arc-shaped convex blocks. The arc-shaped convex blocks can guide and position the moving contact head when the moving and static contact heads close, ensure that the moving contact head can be more accurately connected with the static contact head, and improve the precision of the contact head connection. In addition, the arc-shaped convex blocks can also disperse the pressure on the contact finger petals when the contact head is closed, make the deformation of the contact finger petals more uniform, thereby enhancing the contact stability between the contact finger petals and the moving contact head, further reducing the contact resistance, reducing the heating phenomenon, and improving the conductivity and stability of the equipment. In the long-term operation process, it is helpful to prolong the service life of the contact head and the contact finger petals, and ensure the reliable operation of the equipment.
[0016] The further improvement of the utility model still has, the outer diameter of the moving contact head is 18.9mm; the minimum inner diameter of the static contact head is 17.6mm. The size design ensures that the moving and static contact heads have a suitable fitting gap.
[0017] The further improvement of the utility model still has, the moving contact head and the static contact head are connected with the shielding cover through the contact seat one and the contact seat two respectively. The shielding cover can effectively shield the electric field distribution of the contact conducting part, reduce the influence of the electric field on the surrounding environment and other components, and improve the insulation performance of the equipment. In a high-voltage environment, uneven electric field distribution may cause local discharge and other problems, affecting the safe operation of the equipment. After installing the shielding cover, the electric field can be more evenly distributed around the contact, reducing the risk of local discharge and enhancing the reliability and stability of the equipment. At the same time, the shielding cover can also prevent external electromagnetic interference from affecting the electrical performance of the contact, ensure that the equipment can still work normally in a complex electromagnetic environment, and improve the anti-interference ability of the equipment.
[0018] The further improvement of the utility model still has, the static contact head is installed on the contact seat two through the locking bolt.
[0019] The further improvement of the utility model still has, the inside of the contact seat one is equipped with the watchband contact finger in contact with the moving contact head. In the opening and closing process of the disconnecting switch, there may be a certain positional deviation and relative movement between the moving contact head and the static contact head. The flexible structure of the watchband contact finger can adapt to such displacement and maintain good contact with the moving contact head through its own deformation, ensuring the stability and reliability of the contact.
[0020] The further improvement of the utility model still has, the inside of the contact seat one is equipped with the guide ring in contact with the moving contact head.
[0021] From the above technical scheme can be seen, the beneficial effects of the utility model are that: two copper-tungsten alloy contact blocks can resist arc ablation when approaching; the contact finger petals separated by the cutting gap provide contact pressure by using self deformation after closing, the static contact structure is very simple, assembly is simple, the overall size of the product is small, the cost is low, and the equipment competitiveness will be significantly improved. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed to be used in the description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to the drawings for the ordinary skilled in the art without creating labor.
[0023] Figure 1 It is the closed switch open state schematic diagram of the embodiment of the utility model.
[0024] Figure 2 It is the closed switch open and close process state schematic diagram of the embodiment of the utility model.
[0025] Figure 3 It is the closed switch contact just contact state schematic diagram of the embodiment of the utility model.
[0026] Figure 4 It is the closed switch close state schematic diagram of the embodiment of the utility model.
[0027] Figure 5 It is Figure 3 The enlarged schematic diagram of A part.
[0028] Figure 6 It is Figure 4 The enlarged schematic diagram of B part.
[0029] Figure 7 It is the moving contact partial structure schematic diagram of the embodiment of the utility model.
[0030] Figure 8 It is the static contact partial structure schematic diagram of the embodiment of the utility model.
[0031] Figure 9 It is the static contact external structure schematic diagram of the embodiment of the utility model.
[0032] In the drawings: 10, moving contact; 11, contact seat one; 12, watchband contact finger; 13, guide ring; 20, static contact; 21, contact seat two; 22, protruding block; 201, cutting gap; 30, shielding cover; 40, copper-tungsten alloy contact block one; 50, copper-tungsten alloy contact block two. DETAILED DESCRIPTION
[0033] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this patent without creative effort are within the scope of protection of this patent.
[0034] Example 1:
[0035] like Figures 1-9 As shown, this utility model discloses a gas-insulated metal-enclosed switchgear, comprising a moving contact 10 and a stationary contact 20, both made of copper and arranged opposite to each other. The moving contact 10 and the stationary contact 20 are respectively connected to a shielding cover 30 via a contact base 11 and a contact base 21. The stationary contact 20 is mounted on the contact base 21 by locking bolts. The shielding cover 30 effectively shields the electric field distribution of the conductive parts of the contact, reducing the impact of the electric field on the surrounding environment and other components, and improving the insulation performance of the equipment. In high-voltage environments, uneven electric field distribution may lead to problems such as partial discharge, affecting the safe operation of the equipment. After installing the shielding cover 30, the electric field can be more evenly distributed around the contact, reducing the risk of partial discharge and enhancing the reliability and stability of the equipment. Simultaneously, the shielding cover 30 can also prevent external electromagnetic interference from affecting the electrical performance of the contact, ensuring that the equipment can still operate normally in complex electromagnetic environments and improving the equipment's anti-interference capability.
[0036] The moving contact 10 is provided with a copper-tungsten alloy contact block 40 at its insertion end; the stationary contact 20 is provided with a copper-tungsten alloy contact block 50 at its access end, which can abut against the copper-tungsten alloy contact block 40 when the moving contact 10 and the stationary contact 20 are inserted or separated; the two copper-tungsten alloy contact blocks are resistant to arc erosion when they are close to each other.
[0037] At least one of the copper-tungsten alloy contact block 40 and copper-tungsten alloy contact block 50 has an inclined contact surface; both copper-tungsten alloy contact block 40 and copper-tungsten alloy contact block 50 have inclined contact surfaces. The fact that both contact surfaces are inclined further optimizes the opening and closing process of the moving and stationary contacts. During closing, the copper-tungsten alloy portions at the front ends of the moving and stationary contacts can break down and make contact more quickly and stably; the generation and extinguishing of the electric arc is accelerated; and the transition from the copper-tungsten portion to the copper portion of the contact point is smoother. During opening, the transition of the contact point can be controlled more precisely; the electric arc is ensured to continuously and stably erode the copper-tungsten alloy portion; the impact of the electric arc on other parts of the contact is further reduced; the performance and service life of the contacts are comprehensively improved; and the reliability and stability of the equipment are enhanced.
[0038] The static contact 20 is provided with an arc-shaped protruding block 22 on the inner wall near the end of the copper-tungsten alloy contact block two 50. The arc-shaped protruding block 22 can play a certain guiding and positioning role on the moving contact 10 when the moving and static contacts are closed, so as to ensure that the moving contact 10 can be more accurately connected with the static contact 20, and the precision of the contact connection is improved. In addition, the arc-shaped protruding block 22 can also disperse the pressure on the contact finger petals when the contacts are closed, so that the deformation of the contact finger petals is more uniform, thereby enhancing the contact stability between the contact finger petals and the moving contact 10, further reducing the contact resistance, reducing the heating phenomenon, and improving the conductivity and stability of the equipment. In the long-term operation process, it is helpful to prolong the service life of the contacts and the contact finger petals, and to ensure the reliable operation of the equipment.
[0039] The static contact 20 is provided with an arc-shaped protruding block 22 on the inner wall near the end of the copper-tungsten alloy contact block two 50. The arc-shaped protruding block 22 can play a certain guiding and positioning role on the moving contact 10 when the moving and static contacts are closed, so as to ensure that the moving contact 10 can be more accurately connected with the static contact 20, and the precision of the contact connection is improved. In addition, the arc-shaped protruding block 22 can also disperse the pressure on the contact finger petals when the contacts are closed, so that the deformation of the contact finger petals is more uniform, thereby enhancing the contact stability between the contact finger petals and the moving contact 10, further reducing the contact resistance, reducing the heating phenomenon, and improving the conductivity and stability of the equipment. In the long-term operation process, it is helpful to prolong the service life of the contacts and the contact finger petals, and to ensure the reliable operation of the equipment.
[0040] Embodiment two:
[0041] The angle between the abutting surface of the copper-tungsten alloy contact block one 40 and the vertical surface is 42.5°, and the angle between the abutting surface of the copper-tungsten alloy contact block two 50 and the vertical surface is 15°. The specific angle designed accurately makes the interaction between the copper-tungsten alloy contact blocks more reasonable during the opening and closing of the moving and static contacts. When closing, such an angle setting can make the copper-tungsten alloy part at the front end of the moving contact 10 and the copper-tungsten alloy part at the front end of the static contact 20 break down at the right time, and in the subsequent closing action, the transition of the contact point is more stable and rapid, effectively shortening the time of the electric arc, reducing the ablation degree of the electric arc on the contact, and when opening, the specific angle can ensure that the transition of the contact point is more orderly during the separation of the moving and static contacts, the ablation of the electric arc on the copper-tungsten alloy part is more stable, the main conduction area of the contact is protected to the greatest extent, and the performance and reliability of the equipment are improved. This accurate angle design is obtained through a large number of experiments and theoretical analysis, and can significantly improve the overall performance of the product.
[0042] The thickness of the copper-tungsten alloy contact block one 40 in the insertion direction is 1.8mm, and the thickness of the copper-tungsten alloy contact block two 50 in the insertion direction is 2.7mm. The thickness of the copper-tungsten alloy contact block designed reasonably ensures that there is enough material reserve for the contact block to withstand the ablation of the electric arc, and also considers the compactness of the overall structure.
[0043] The outer diameter of the moving contact 10 is 18.9mm; the minimum inner diameter of the static contact 20 is 17.6mm. Such size design ensures the appropriate fitting gap between the moving and static contacts.
[0044] Example three:
[0045] The inside of the contact seat 11 is provided with a watchband contact finger 12 in contact with the moving contact 10. During the opening and closing of the disconnector, there may be a certain positional deviation and relative movement between the moving contact 10 and the static contact 20. The flexible structure of the watchband contact finger 12 can adapt to such displacement; by deforming itself to maintain good contact with the moving contact 10; to ensure the stability and reliability of the contact.
[0046] The inside of the contact seat 11 is provided with a guide ring 13 in contact with the moving contact 10. During the closing and opening of the grounding switch; the guide ring 13 provides an accurate guide path for the movement of the moving contact 10; reduces the probability of jamming and collision during the docking or separation of the moving contact 10 and the static contact 20; and enhances the electrical connection performance.
[0047] The use process of the device is as follows:
[0048] 1. When closing: the front end copper-tungsten alloy contact block one 40 of the moving contact 10 first breaks down with the front end copper-tungsten alloy contact block two 50 of the static contact 20; the electric arc ablates in the copper-tungsten alloy part of the moving and static contacts; the moving contact 10 continues to close until the copper-tungsten part of the moving contact 10 contacts the copper-tungsten part of the static contact 20; at this time, the moving and static contacts are connected; the electric arc disappears. Because the moving and static contacts are designed with a certain inclination angle; the moving contact 10 continues to close and gradually pries open the static contact 20 contact finger petals; the contact points of the moving and static contacts gradually transition from copper-tungsten part contact to copper part contact; at this time, the moving contact 10 pries open the static contact 20 by a certain distance; the static contact 20 contact finger petals provide a certain elastic deformation force after elastic deformation; to ensure reliable contact between the static contact 20 contact finger petals and the moving contact 10; at this time, the moving and static contacts are copper-copper contact; the elastic deformation provides reliable contact pressure; which can ensure that the disconnector and the grounding switch can withstand long-term load current and short-term short-circuit fault current.
[0049] 2. When opening: the moving contact 10 moves to the highest contact point of the static contact 20 and continues to open; since the contact finger petals are self-deformed, they will recover deformation inwardly with the movement of the moving contact 10; since the front ends of the moving and static contacts are designed with a certain inclination angle, this process can ensure that the moving and static contacts are always in contact and do not occur arc ablation (protecting the main copper conductor of the moving and static contacts); the contact point of the moving and static contacts is from copper-copper contact to copper tungsten-copper tungsten contact. The moving contact 10 continues to open; the copper tungsten alloy of the front end of the moving and static contacts is separated; the copper tungsten part generates an arc; the arc ablates the copper tungsten alloy part of the moving and static contacts; the moving contact 10 continues to open until the arc is extinguished; the switch is smoothly opened.
[0050] 3. The moving and static contacts are externally provided with a shielding cover 30; the shielding contact has an electric field distribution.
[0051] The utility model discloses a kind of gas insulated metal-enclosed switch devices;Two copper tungsten alloy contact blocks can resist arc ablation when approaching;Contact finger petals separated by cutting seam provide contact pressure by using self deformation after closing;The static contact structure is very simple;Assembly is simple;Product overall size is small;Low cost;It will significantly improve the competitiveness of equipment.
[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art; the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore; the utility model will not be limited to these embodiments shown in the text; but will conform to the widest range consistent with the principles and novel features disclosed herein.
Claims
1. A gas-insulated metal-enclosed switchgear comprising a moving contact (10) and a stationary contact (20) which are arranged opposite to each other and are both made of copper, characterized in that The plug-in end of the movable contact (10) is provided with a copper-tungsten alloy contact block one (40), the access end of the static contact (20) is provided with a copper-tungsten alloy contact block two (50) which can abut against the copper-tungsten alloy contact block one (40) when the movable contact (10) and the static contact (20) are plugged or separated; the abutting surface of at least one of the copper-tungsten alloy contact block one (40) and the copper-tungsten alloy contact block two (50) is obliquely arranged; the static contact (20) is uniformly distributed with a cutting slot (201) in the circumferential direction, the cutting slot (201) extends along the access direction of the static contact (20), and one end of the cutting slot (201) close to the access end is in communication with the outside; the cutting slot (201) divides the static contact (20) into a plurality of contact finger petals.
2. The gas insulated metal enclosed switchgear according to claim 1, characterized in that, The abutting surfaces of the copper-tungsten alloy contact block one (40) and the copper-tungsten alloy contact block two (50) are both inclined surfaces.
3. The gas insulated metal enclosed switchgear according to claim 2, characterized in that, The angle between the abutting surface of the copper-tungsten alloy contact block one (40) and the vertical surface is 42.5°; the angle between the abutting surface of the copper-tungsten alloy contact block two (50) and the vertical surface is 15°.
4. The gas insulated metal enclosed switchgear according to claim 1, characterized in that, The thickness of the copper-tungsten alloy contact block one (40) in the plugging direction is 1.8mm; the thickness of the copper-tungsten alloy contact block two (50) in the plugging direction is 2.7mm.
5. The gas insulated metal enclosed switchgear according to claim 1, wherein, The inner wall of the static contact (20) close to one end of the copper-tungsten alloy contact block two (50) is provided with an arc-shaped protruding block (22).
6. The gas insulated metal enclosed switchgear according to claim 5, characterized in that, The outer diameter of the movable contact (10) is 18.9mm; the minimum inner diameter of the static contact (20) is 17.6mm.
7. A gas insulated metal enclosed switchgear according to any of claims 1 to 6, characterized in that The movable contact (10) and the static contact (20) are respectively connected with a shielding cover (30) through a contact seat one (11) and a contact seat two (21).
8. The gas insulated metal enclosed switchgear according to claim 7, characterized in that, The static contact (20) is installed on the contact seat two (21) through a locking bolt.
9. The gas insulated metal enclosed switchgear according to claim 7, wherein, The inside of the contact seat one (11) is provided with a watchband contact finger (12) which is in contact with the movable contact (10).
10. The gas insulated metal enclosed switchgear according to claim 7, wherein, The inside of the contact seat one (11) is provided with a guide ring (13) which is in contact with the movable contact (10).