Moving arc contact, moving arc contact assembly and isolating switch

Abstract

The utility model relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a moving arc contact, a moving arc contact assembly and an isolating switch. The moving arc contact of the utility model comprises an annular main body. The outer contour of the inner side face, the front side face and the outer side face of the annular body sequentially comprises an inner side inclined section located on the inner side face and inclined from inside to outside in the radial direction, an inner edge arc section located at the connecting position of the inner side face and the front side face, a front end linear section located on the front side face and an extension arc section extending from the front side face to the outer side face in a transition mode from inside to outside. The shape of the outer contour meets the conditions that the maximum value of the field intensity at the inner edge arc section is not larger than 25 kV / mm, and the difference value between the maximum value of the field intensity at the extension arc section and the maximum value of the field intensity at the inner edge arc section is not smaller than 1.5 kV / mm. According to the utility model, the difference value between the maximum value of the field intensity at the extension arc section and the maximum value of the field intensity at the inner edge arc section of the moving arc contact is not less than 1.5 kV / mm, and the arc is concentrated in the central area of the moving arc contact, so that the arc is prevented from floating outwards.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure or big current switch technical field with arc extinguishing or arc preventing device, especially to a kind of moving arc contact, moving arc contact subassembly and disconnecting switch. BACKGROUND

[0002] Disconnecting switch has the effect of small current in the line in power grid, such as bushing, short busbar charging current, circuit breaker grading capacitor capacitive current etc. In the process of disconnecting switch operating capacitive small current, transient overvoltage (VFTO) can be generated between moving arc contact and static arc contact, specifically, when disconnecting switch operates capacitive small current, multiple reignition can be generated between contacts, and each reignition can generate overvoltage in loop, since reignition process is very fast, the wavefront time of generated overvoltage is also very short, usually in microsecond level or even nanosecond level, thus it is called transient overvoltage. Transient overvoltage can form arc with large voltage and small current, current is usually below 10A, energy is small, but the shape of arc is extremely irregular, easy to develop and drift to all directions, causing internal insulation of disconnecting switch to deteriorate, which can cause arc short circuit to ground, short circuit current increases by thousands of times instantaneously, which can cause damage to GIS equipment and power grid failure.

[0003] According to the principle of tompson and streamer theory, arc breakdown and maintenance occur preferentially in the center part with large electric field intensity, the electric field distribution of moving arc contact of existing disconnecting switch is as shown in Figure 1 The maximum field intensity in the center region of moving arc contact is 22.42kV / mm, and the maximum field intensity in the peripheral region is 21.48kV / mm, the difference of field intensity between the center region and the peripheral region of moving arc contact is only 0.94kV / mm, and arc is easy to drift outward. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of moving arc contact to solve the problem that the difference of field intensity between the center region and the peripheral region of existing moving arc contact is small, and arc is easy to drift outward;The utility model aims at providing a kind of moving arc contact subassembly to solve the problem that the difference of field intensity between the center region and the peripheral region of existing moving arc contact is small, and arc is easy to drift outward;The utility model also aims at providing a kind of disconnecting switch to improve the reliability and safety of existing disconnecting switch.

[0005] To achieve the above-mentioned purpose, the moving arc contact of the utility model adopts the following technical solutions:

[0006] The movable arc contact includes a ring-shaped body, and the outer profile of the inner side surface, the front side surface and the outer side surface of the ring-shaped body successively includes an inner side inclined section which is radially inclined from inside to outside at the inner side surface, an inner arc section at the position where the inner side surface meets the front side surface, a front end straight section at the front side surface and an outer extension arc section which extends from the front side surface to the outer side surface, and the shape of the outer profile satisfies that the maximum field strength at the inner arc section is not greater than 25kV / mm, and the difference between the maximum field strength at the outer extension arc section and the maximum field strength at the inner arc section is not less than 1.5kV / mm.

[0007] Further, the inner arc section includes a first inner arc section and a second inner arc section, the outer extension arc section includes a first outer extension arc section, a second outer extension arc section and a third outer extension arc section, and the shape of the outer profile satisfies that the maximum field strength position at the inner arc section is at the first inner arc section, and the maximum field strength position at the outer extension arc section is at the first outer extension arc section.

[0008] Further, the length of the inner side inclined section ranges from 15mm to 20mm, the included angle between the inner side inclined section and the movement direction of the movable arc contact ranges from 10° to 20°, the radius of the first inner arc section ranges from 2mm to 5mm, the central angle of the first inner arc section ranges from 50° to 60°, the radius of the second inner arc section ranges from 2mm to 5mm, the central angle of the second inner arc section ranges from 15° to 25°, the front end straight section is perpendicular to the movement direction of the movable arc contact, and the length of the front end straight section ranges from 1mm to 5mm, the radius of the first outer extension arc section ranges from 40mm to 45mm, the central angle of the first outer extension arc section ranges from 25° to 35°, the radius of the second outer extension arc section ranges from 40mm to 60mm, the central angle of the second outer extension arc section ranges from 10° to 15°, the radius of the third outer extension arc section ranges from 25mm to 30mm, and the central angle of the third outer extension arc section ranges from 40° to 60°.

[0009] Further, the movable arc contact is a copper tungsten contact.

[0010] Beneficial effects: the movable arc contact is an element change type invention. Through the scheme, the outer profile of the movable arc contact is changed, the electric field is concentrated in the central region of the movable arc contact, the field strength difference between the central region and the surrounding region of the movable arc contact is greater than 1.5kV / mm, the electric arc is concentrated in the central region of the movable arc contact, the electric arc is inhibited from drifting outward, and the disconnecting switch is protected.

[0011] The movable arc contact assembly of the utility model adopts the following technical scheme:

[0012] The moving arc contact assembly comprises a contact rod body, a moving arc contact seat fixedly connected at the end of the contact rod body, and a moving arc contact fixed on the moving arc contact seat, wherein the moving arc contact comprises a ring-shaped body, and the outer profile of the inner side surface, the front side surface and the outer side surface of the ring-shaped body comprises, in sequence from inside to outside, an inner side inclined section inclined radially from inside to outside on the inner side surface, an inner arc section at the joint position of the inner side surface and the front side surface, a front end straight section on the front side surface, and an outer extension arc section extending from the front side surface to the outer side surface, and the shape of the outer profile satisfies that the maximum field strength at the inner arc section is not greater than 25 kV / mm, and the difference between the maximum field strength at the outer extension arc section and the maximum field strength at the inner arc section is not less than 1.5 kV / mm.

[0013] Further, the inner arc section comprises a first inner arc section and a second inner arc section, the outer extension arc section comprises a first outer extension arc section, a second outer extension arc section and a third outer extension arc section, and the shape of the outer profile satisfies that the maximum field strength position at the inner arc section is on the first inner arc section, and the maximum field strength position at the outer extension arc section is on the first outer extension arc section.

[0014] Further, the length of the inner side inclined section ranges from 15 mm to 20 mm, and the included angle between the inner side inclined section and the moving direction of the moving arc contact ranges from 10° to 20°; the radius of the first inner arc section ranges from 2 mm to 5 mm, and the central angle of the first inner arc section ranges from 50° to 60°; the radius of the second inner arc section ranges from 2 mm to 5 mm, and the central angle of the second inner arc section ranges from 15° to 25°; the front end straight section is perpendicular to the moving direction of the moving arc contact, and the length of the front end straight section ranges from 1 mm to 5 mm; the radius of the first outer extension arc section ranges from 40 mm to 45 mm, and the central angle of the first outer extension arc section ranges from 25° to 35°; the radius of the second outer extension arc section ranges from 40 mm to 60 mm, and the central angle of the second outer extension arc section ranges from 10° to 15°; and the radius of the third outer extension arc section ranges from 25 mm to 30 mm, and the central angle of the third outer extension arc section ranges from 40° to 60°.

[0015] Further, the moving arc contact is a copper-tungsten contact.

[0016] Further, the moving arc contact seat is a chromium-bronze moving arc contact seat.

[0017] Further, the moving arc contact and the moving arc contact seat are sinteredly connected.

[0018] Further, the moving arc contact seat and the contact rod body are threadedly connected.

[0019] Further, the threads of the moving arc contact seat and the contact rod body are coated with anaerobic glue.

[0020] Beneficial effects: The moving arc contact assembly of this utility model is an improved invention. By changing the outer contour of the moving arc contact, the electric field is concentrated in the central region of the moving arc contact, making the electric field strength difference between the central region and the surrounding region greater than 1.5kV / mm. This concentrates the arc in the central region of the moving arc contact, suppresses the outward drift of the arc, and protects the disconnecting switch.

[0021] The disconnecting switch of this utility model adopts the following technical solution:

[0022] A disconnecting switch includes a moving arc contact assembly and a stationary arc contact assembly. The moving arc contact assembly includes a contact rod, with a moving arc contact seat fixedly connected to the end of the contact rod. A moving arc contact is fixed on the moving arc contact seat. The moving arc contact includes an annular body. The outer contour of the inner side, front side, and outer side of the annular body, from the inside to the outside, includes, in sequence, an inner inclined segment that is radially inclined from the inside to the outside on the inner side, an inner edge arc segment at the junction of the inner side and the front side, a front straight segment, and an outer extended arc segment that transitions from the front side to the outer side. The shape of the outer contour satisfies that the maximum electric field strength at the inner edge arc segment is not greater than 25 kV / mm, and the difference between the maximum electric field strength at the outer extended arc segment and the maximum electric field strength at the inner edge arc segment is not less than 1.5 kV / mm.

[0023] Furthermore, the inner edge arc segment includes a first inner edge arc segment and a second inner edge arc segment, and the outer extension arc segment includes a first outer extension arc segment, a second outer extension arc segment, and a third outer extension arc segment. The shape of the outer contour satisfies the condition that the position of maximum electric field strength at the inner edge arc segment is located on the first inner edge arc segment, and the position of maximum electric field strength at the outer extension arc segment is located on the first outer extension arc segment.

[0024] Further, the length of the inner inclined section ranges from 15mm to 20mm, and the angle between the inner inclined section and the direction of movement of the moving arc contact ranges from 10° to 20°; the radius of the first inner arc segment ranges from 2mm to 5mm, and the central angle of the first inner arc segment ranges from 50° to 60°; the radius of the second inner arc segment ranges from 2mm to 5mm, and the central angle of the second inner arc segment ranges from 15° to 25°; the front straight section and the direction of movement of the moving arc contact... The length of the front straight segment is 1mm to 5mm; the radius of the first outer arc segment is 40mm to 45mm, and the central angle of the first outer arc segment is 25° to 35°; the radius of the second outer arc segment is 40mm to 60mm, and the central angle of the second outer arc segment is 10° to 15°; the radius of the third outer arc segment is 25mm to 30mm, and the central angle of the third outer arc segment is 40° to 60°.

[0025] Furthermore, the moving arc contact is a copper-tungsten contact.

[0026] Furthermore, the moving arc contact seat is a chromium bronze moving arc contact seat.

[0027] Furthermore, the moving arc contact and the moving arc contact seat are sintered together.

[0028] Furthermore, the moving arc contact seat and the contact rod body are threaded together.

[0029] Furthermore, anaerobic adhesive is applied to the threads of the moving arc contact seat and the contact rod body. Beneficial effects: This invention represents an improved disconnecting switch. By altering the outer contour of the moving arc contact, the electric field is concentrated in the central region of the moving arc contact, resulting in a field strength difference greater than 1.5 kV / mm between the central region and the surrounding area. This concentrates the arc in the central region of the moving arc contact, suppressing outward arc drift and protecting the disconnecting switch. Attached Figure Description

[0030] Figure 1 Electric field distribution of the existing disconnector's arcing contact;

[0031] Figure 2 This is the electric field distribution of the moving arc contact of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the moving arc contact of this utility model;

[0033] Figure 4 This is a schematic diagram of the contour curve of the moving arc contact of this utility model;

[0034] Figure 5 This is a schematic diagram of the disconnecting switch of this utility model;

[0035] Figure 6 for Figure 5 Sectional view of AA.

[0036] In the diagram: 1. Moving arc contact; 2. Moving arc contact seat; 3. Contact rod body; 4. Inner inclined section; 5. Front straight section; 6. First inner arc section; 7. Second inner arc section; 8. First outer arc section; 9. Second outer arc section; 10. Third outer arc section; 11. Stationary arc contact; 12. Moving end shield; 13. Stationary end shield; 14. Gear and rack transmission structure; 15. Basin insulator; 16. Disconnecting switch housing; 17. Moving contact transmission gear shaft; 18. Insulating transmission torsion bar; 19. Operating mechanism. Detailed Implementation

[0037] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0038] The moving arc contact of this invention utilizes Townsend's principle and streamer theory. By changing the contour of the moving arc contact, the electric field is concentrated in the central region of the moving arc contact, so that the electric arc is concentrated in the central region of the moving arc contact, preventing the electric arc from drifting outward.

[0039] An embodiment of the moving arc contact of this utility model is as follows:

[0040] As a basic solution, the moving arc contact 1 of this utility model includes an annular body. The outer contours of the inner side, front side and outer side of the annular body, from the inside to the outside, include, in sequence, an inner inclined segment that is radially inclined from the inside to the outside on the inner side, an inner edge arc segment at the junction of the inner side and the front side, a front end straight segment on the front side and an outer arc segment that transitions from the front side to the outer side. During the opening and closing process, a short-term transient overvoltage (VFTO) will be generated between the moving arc contact 1 and the stationary arc contact. According to Townsend's principle, the electric field strength must reach a certain threshold to induce ionization and discharge. It is ensured that the electric field strength in the central region of the moving arc contact 1 is relatively high, that is, the field strength at the inner arc segment of the outer contour of the moving arc contact 1 is relatively high, in order to promote the occurrence of the ionization process. The surrounding area is designed with a gradually decreasing electric field strength, that is, the field strength at the outer arc segment of the outer contour of the moving arc contact 1 gradually decreases, in order to reduce the risk of breakdown. According to the streamer theory, it is ensured that the electric field is unevenly distributed on the surface of the moving arc contact 1 to induce streamer discharge and control its development direction. The streamer is guided to form and extinguish at the inner arc segment of the outer contour of the moving arc contact 1, thereby avoiding unnecessary discharge in the outer arc segment region of the outer contour of the moving arc contact 1.

[0041] Specifically, the electric field distribution of the moving arc contact 1 of this utility model is as follows: Figure 2As shown, the shape of the outer contour of the moving arc contact 1 must meet the requirement that the maximum electric field strength at the inner arc segment is no greater than 25kV / mm. When the electric field strength exceeds a certain threshold, ionization will occur, leading to breakdown. Controlling the maximum electric field strength at the inner arc segment of the outer contour of the moving arc contact 1 below 25kV / mm can effectively prevent breakdown and ensure that the switch will not be damaged by excessive electric field under normal operating conditions. Excessive electric field strength will cause the dielectric inside the equipment to age faster and shorten the equipment life. By controlling the maximum electric field strength, the aging rate of the dielectric can be reduced, thereby extending the service life of the disconnecting switch. Furthermore, a stable electric field distribution helps ensure the stable operation of the switch under various operating conditions. Controlling the electric field strength within a reasonable range can reduce equipment failures caused by uneven electric field distribution and improve the reliability of the disconnecting switch. The shape of the outer contour of the moving arc contact 1 must satisfy the requirement that the difference between the maximum electric field strength at the outer arc segment and the maximum electric field strength at the inner arc segment is not less than 1.5 kV / mm. A larger difference in electric field strength means that the electric field strength at the inner arc segment of the moving arc contact is significantly higher than that at the outer arc segment. This ensures that when the moving arc contact 1 is subjected to high voltage, the electric field can be concentrated at the inner arc segment, while the outer arc segment region maintains a lower electric field strength. This can more effectively guide the arc to extinguish in the central region, thereby improving the arc extinguishing capability of the switch and helping to reduce the interference of the electric field on surrounding equipment, while also improving the insulation performance of the switch.

[0042] Taking into account the uniformity and concentration of the electric field distribution, the central region of the moving arc contact 1 is designed to be slightly convex, while the surrounding area gradually transitions smoothly. As a preferred embodiment, such as... Figure 4 As shown, the inner inclined segment 4, the inner edge arc segment, the front straight segment 5, and the outer extended arc segment are connected sequentially. The inner edge arc segment includes a first inner edge arc segment 6 and a second inner edge arc segment 7, and the outer extended arc segment includes a first outer extended arc segment 8, a second outer extended arc segment 9, and a third outer extended arc segment 10. The inner inclined segment 4 guides the electric field lines to concentrate towards the central region, while avoiding excessive concentration of the electric field at the contact edge. The angle and length of the inner inclined segment 4 need to be adjusted according to the specific electric field distribution requirements. The inner edge arc segment further smooths the electric field distribution and reduces abrupt changes in the electric field at the contact edge. By adjusting the radius and position of the arc, the distribution of the electric field on the contact surface can be optimized. The maximum electric field strength point is designed on the first inner edge arc segment 6 to ensure the maximum electric field strength in the central region. The minimum electric field strength point is designed on the third outer extended arc segment 10 to ensure the minimum electric field strength in the surrounding area. The straight section maintains the stability of the electric field distribution and serves as a transition connecting the inner and outer circular arc segments, ensuring the continuity and uniformity of the electric field on the contact surface. The design of the outer circular arc segment further smooths the electric field distribution, especially in the central region of the contact. By adjusting the radius and position of the arc, the electric field can be made to concentrate strongly in the central region and gradually weaken in the surrounding areas.

[0043] In a preferred embodiment, the length of the inner inclined section 4 ranges from 15mm to 20mm, with preferred values ​​including 15mm, 16mm, 19mm, and 20mm. These lengths are chosen to ensure a smooth transition of the electric field on the inner inclined section 4 while maintaining sufficient length to guide the concentration of the electric field lines. Based on the direction of movement of the moving arc contact 1, the angle between the inner inclined section 4 and the direction of movement of the moving arc contact 1 ranges from 10° to 20°, with preferred values ​​including 10°, 15°, 17°, 19°, and 20°. These angles are chosen to gradually guide the electric field lines to concentrate towards the central region while avoiding excessive concentration of the electric field at the edge of the contact. The radius of the first inner arc segment 6 ranges from 2mm to 5mm, with preferred values ​​including 2mm, 3mm, and 5mm. These radii are chosen to smooth the electric field distribution and reduce abrupt changes in the electric field at the contact edge. The central angle of the first inner arc segment 6 ranges from 50° to 60°, with preferred values ​​including 50°, 55°, 57°, and 60°. These arc lengths further smooth the electric field distribution and create a good transition with the inner inclined segment 4 and the subsequent arc segment. The radius of the second inner arc segment 7 ranges from 2mm to 5mm, with preferred values ​​including 2mm, 4mm, and 5mm. These radii are chosen to further smooth the electric field distribution and create a good transition with the first inner arc segment 6 and the subsequent segment. The central angle of the second inner arc segment 7 ranges from 15° to 25°, with preferred values ​​including 15°, 16°, 20°, 21°, and 25°. These central angles are chosen to ensure the continuity and uniformity of the electric field on the contact surface. The front straight segment 5 is perpendicular to the direction of movement of the moving arc contact 1. The length of the front straight segment 5 ranges from 1mm to 5mm, with preferred values ​​including 1mm, 2mm, 4mm, and 5mm. These lengths are chosen to serve as a transition between the two inner arc segments and the three outer arc segments, ensuring the continuity and uniformity of the electric field on the contact surface. The radius of the first outer arc segment 8 ranges from 40mm to 45mm, with preferred values ​​including 40mm, 42mm, 44mm, and 45mm. These radii are chosen to create a strong electric field concentration in the central region of the contact. The central angle of the first outer arc segment 8 ranges from 25° to 35°, with preferred values ​​including 25°, 29°, 30°, and 35°. These central angles are chosen to create a significant peak in the electric field in the central region, which gradually weakens in the surrounding region.The radius of the second extended arc segment 9 ranges from 40mm to 60mm, with preferred values ​​including 40mm, 49mm, 50mm, 52mm, and 60mm. These radii are chosen to further smooth the electric field distribution and to create a good transition with the first extended arc segment 8 and subsequent parts. The central angle of the second extended arc segment 9 ranges from 10° to 15°, with preferred values ​​including 10°, 12°, and 15°. These central angles are chosen to ensure the continuity and uniformity of the electric field on the contact surface. The radius of the third extended arc segment 10 ranges from 25mm to 30mm, with preferred values ​​including 25mm, 27mm, and 30mm. These radii are chosen to create a gradually weakening electric field distribution at the end of the contact. The central angle of the third extended arc segment 10 ranges from 40° to 60°, with preferred values ​​including 40°, 48°, 50°, 52°, and 60°. These central angles are chosen to make the electric field gradually weaken at the end of the contact, while also creating a good transition with the second extended arc segment 9.

[0044] In a preferred embodiment, the arc-moving contact 1 is a high-wear-resistant copper-tungsten contact. The copper-tungsten contact combines the high hardness of tungsten with the good toughness of copper, exhibiting excellent wear resistance. In disconnecting switches, this wear resistance ensures that the contact maintains a low wear rate during frequent opening and closing operations, thereby extending the contact's service life. The copper component provides high electrical conductivity, giving the copper-tungsten contact good electrical conductivity as well, which helps reduce resistance losses during disconnecting switch operation and improves equipment energy efficiency. The refractory properties of tungsten enable the copper-tungsten contact to withstand arc erosion, reducing damage to the contact under arc action. The high wear resistance and arc erosion resistance of the copper-tungsten contact allow the disconnecting switch to extinguish the arc more effectively during opening and closing, protecting the disconnecting switch from arc damage and improving equipment reliability and safety. In other embodiments, a silver-tungsten contact, which also has high wear resistance and arc erosion resistance, can be selected. Silver has better conductivity than copper; however, silver is more expensive and may oxidize more easily in certain environments.

[0045] An embodiment of the moving arc contact assembly of this utility model is as follows:

[0046] As a basic solution, the structure of the moving arc contact assembly of this utility model is as follows: Figure 3 As shown, the moving arc contact assembly includes a moving arc contact 1, a moving arc contact seat 2, and a contact rod 3. The moving arc contact seat 2 is fixed at the end of the moving arc contact 1, and the moving arc contact 1 is fixed on the moving arc contact seat 2. The mating surface of the moving arc contact seat 2 that mates with the moving arc contact 1 is in the shape of a boss, and the boss is embedded in the axial end face of the bottom of the moving arc contact 1. The original mating between the moving arc contact and the moving arc contact seat was that the outer peripheral surface of the moving arc contact and the outer peripheral surface of the moving arc contact seat were in contact. At this time, the mating seam was on the side of the moving arc contact, and its electric field distribution was as follows. Figure 1As shown, compared to having the butt joint on the outer surface of the moving arc contact, the butt joint surface located on the axial end face at the bottom of the moving arc contact 1 is more conducive to uniformly distributing the electric field at the outer arc of the moving arc contact 1, thus increasing the difference between the maximum electric field strength at the outer arc segment and the maximum electric field strength at the inner arc segment. The moving arc contact assembly plays a role in breaking and closing the circuit in the disconnecting switch. When the disconnecting switch is open, the operating mechanism drives the contact rod 3 to separate the moving arc contact 1 from the stationary contact, forming an open circuit; when the disconnecting switch is closed, the operating mechanism drives the contact rod 3 to make the moving arc contact 1 and the stationary contact come into close contact, forming a closed circuit. Embodiments of the moving arc contact have been described above and will not be repeated here.

[0047] In a preferred embodiment, the moving arc contact seat 2 is a chromium bronze moving arc contact seat 2. Chromium bronze has excellent electrical conductivity, and the chromium bronze moving arc contact seat 2 helps reduce the resistance loss generated by the disconnecting switch during operation, thereby improving the energy efficiency of the equipment. The chromium bronze moving arc contact seat 2 has excellent wear resistance and corrosion resistance, and can withstand the mechanical stress and environmental corrosion generated by the GIS disconnecting switch during frequent opening and closing operations, thereby extending the service life of the equipment.

[0048] In a preferred embodiment, the moving arc contact 1 and the moving arc contact base 2 are connected by sintering. Sintering, through high-temperature sintering, forms a tight metal bond between the moving arc contact 1 and the moving arc contact base 2, ensuring good conductivity. Sintering effectively reduces contact resistance, decreases energy loss, and improves the conductivity efficiency of the GIS disconnector. The sintered connection also possesses extremely high mechanical strength, capable of withstanding the enormous mechanical stress generated during the opening and closing of the GIS disconnector. Furthermore, the sintered connection exhibits excellent durability, maintaining stable performance over extended periods of use. In other embodiments, the moving arc contact 1 and the moving arc contact base 2 can be connected by welding. Welding achieves the connection by melting the metal between the moving arc contact 1 and the moving arc contact base 2. Welded connections offer high strength and good conductivity, but thermal stress and deformation may occur during welding, requiring strict control of the welding process.

[0049] In a preferred embodiment, the moving arc contact seat 2 and the contact rod 3 are connected by a threaded connection. Threaded connections achieve connection through the interlocking of threads, offering high reliability. This connection method is not easily loosened and can withstand the enormous mechanical stress generated during the opening and closing of the disconnecting switch. Disassembly of threaded connections is relatively simple; only the nut needs to be unscrewed, eliminating the need for complex tools or equipment. This is crucial for the maintenance and upkeep of the disconnecting switch, saving significant time and costs. Threaded connections have a high degree of dimensional standardization, allowing for the selection of different connection models according to varying requirements, making the design, manufacturing, and maintenance of the disconnecting switch more convenient and efficient. In other embodiments, the moving arc contact seat 2 and the contact rod 3 can also be connected by welding. Welding achieves connection by melting the metal between the moving arc contact seat 2 and the contact rod 3. Welded connections offer high strength and good conductivity, but thermal stress and deformation may occur during welding, requiring strict control of the welding process.

[0050] In a preferred embodiment, the threads of the moving arc contact seat 2 and the contact rod body 3 are coated with anaerobic adhesive. Anaerobic adhesive can cure in an oxygen-deficient environment, forming a strong sealing layer that effectively prevents gas or liquid leakage. The molecular structure of anaerobic adhesive allows it to resist vibration-induced damage to the seal to a certain extent, ensuring the disconnector maintains a good seal even in harsh environments. Anaerobic adhesive also has excellent chemical resistance, effectively resisting the erosion of various chemical media that may be present in the GIS disconnector, ensuring long-term stability of the sealing performance.

[0051] An embodiment of the disconnecting switch of this utility model is as follows:

[0052] As a basic solution, the structure of the disconnecting switch of this utility model is as follows: Figure 5 and Figure 6 As shown, the disconnecting switch of this utility model includes a moving arc contact 1, a stationary arc contact 11, a moving end shielding cover 12, a stationary end shielding cover 13, a gear and rack transmission structure 14, a basin-type insulator 15, a disconnecting switch housing 16, a moving contact transmission gear shaft 17, an insulating transmission torsion bar 18, and an operating mechanism 19. The assembly relationship of the stationary arc contact 11, the moving end shielding cover 12, the stationary end shielding cover 13, the gear and rack transmission structure 14, the basin-type insulator 15, the disconnecting switch housing 16, the moving contact transmission gear shaft 17, the insulating transmission torsion bar 18, and the operating mechanism 19 is the same as that of existing disconnecting switches. The embodiment of the moving arc contact assembly has been described above and will not be repeated here.

[0053] The specific implementation process of this embodiment is as follows:

[0054] After receiving the opening or closing command, the operating mechanism starts and drives the moving contact transmission gear shaft to rotate through the insulated transmission torsion bar. Subsequently, the moving contact transmission gear shaft drives the gear and rack transmission structure on the contact rod 3 to realize the horizontal movement of the contact rod 3 and the moving arc contact 1, and finally completes the opening or closing action.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A moving arc contact, characterized by, The outer contour of the inner side surface, the front side surface and the outer side surface of the annular body comprises, from inside to outside, in sequence, an inner side inclined section which is radially inclined from inside to outside at the inner side surface, an inner arc section at the position where the inner side surface meets the front side surface, a front end straight section at the front side surface, and an outer extension arc section which extends from the front side surface to the outer side surface, and the shape of the outer contour satisfies that the maximum field strength at the inner arc section is not greater than 25kV / mm, and the difference between the maximum field strength at the outer extension arc section and the maximum field strength at the inner arc section is not less than 1.5kV / mm.

2. The moving arc contact according to claim 1, characterized in that The inner arc section comprises a first inner arc section and a second inner arc section, and the outer extension arc section comprises a first outer extension arc section, a second outer extension arc section and a third outer extension arc section, and the shape of the outer contour satisfies that the maximum field strength position at the inner arc section is at the first inner arc section, and the maximum field strength position at the outer extension arc section is at the first outer extension arc section.

3. The moving arc contact according to claim 2, characterized in that The length of the inner side inclined section ranges from 15mm to 20mm, and the included angle between the inner side inclined section and the movement direction of the movable arc contact ranges from 10° to 20°; the radius of the first inner arc section ranges from 2mm to 5mm, and the central angle of the first inner arc section ranges from 50° to 60°; the radius of the second inner arc section ranges from 2mm to 5mm, and the central angle of the second inner arc section ranges from 15° to 25°; the front end straight section is perpendicular to the movement direction of the movable arc contact, and the length of the front end straight section ranges from 1mm to 5mm; the radius of the first outer extension arc section ranges from 40mm to 45mm, and the central angle of the first outer extension arc section ranges from 25° to 35°; the radius of the second outer extension arc section ranges from 40mm to 60mm, and the central angle of the second outer extension arc section ranges from 10° to 15°; the radius of the third outer extension arc section ranges from 25mm to 30mm, and the central angle of the third outer extension arc section ranges from 40° to 60°.

4. A moving arc contact according to any one of claims 1-3, characterised in that The movable arc contact is a copper-tungsten contact.

5. A moving arc contact assembly comprising a contact stem, a moving arc contact seat fixedly connected to an end of the contact stem, and a moving arc contact fixed to the moving arc contact seat, characterized in that, The movable arc contact is the movable arc contact according to any one of claims 1-4.

6. The moving arc contact assembly of claim 5, characterized by The movable arc contact seat is a chromium-bronze movable arc contact seat.

7. The moving arc contact assembly of claim 5 or 6, characterized in that The movable arc contact and the movable arc contact seat are sintered together.

8. The moving arc contact assembly of claim 7, characterized by The movable arc contact seat and the contact stem are threadedly connected.

9. The moving arc contact assembly of claim 8, characterized by The threads of the movable arc contact seat and the contact stem are coated with anaerobic glue.

10. A disconnector comprising a moving arc contact assembly and a stationary arc contact assembly, characterized in that The movable arc contact assembly is the movable arc contact assembly according to any one of claims 5-9.

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