Contact system for high-voltage switchgear and high-voltage switchgear

Abstract

The invention discloses a contact system for a high-voltage switch device and the high-voltage switch device, and the system comprises a moving contact which comprises a conductive part and a moving arc contact; the static contact system comprises a first static contact system and a second static contact system, the first static contact system is provided with a first elastic assembly, the end parts of the second static contact system and the moving arc contact are provided with concave-convex matching structures, the second static contact system is provided with a second elastic assembly, and the second static contact system is provided with an accommodating cavity; the first static contact system is located in the accommodating cavity of the second static contact system; and the static side shielding assembly is provided with a static main contact finger, and the static side shielding assembly is matched with the second static contact system to form a narrow channel. According to the contact system for the high-voltage switch equipment provided by the invention, through the concave-convex structures arranged at the end parts of the second static contact system and the moving arc contact and the static side shielding assembly, the stability and reliability of current flow are ensured, and the probability of insulation faults of current carrying and fractures is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switchgear, and more specifically to a contact system for high-voltage switchgear and the high-voltage switchgear. Background Art

[0002] The isolating switch is an extremely important safety device in the system, which is used to safely isolate the power-off equipment and lines from the operating system. Therefore, the isolating switch must have a reliable isolation insulation break. At the same time, the substation often needs to transfer the load current from one bus to another bus. For this operation, the isolating switch needs to have the ability to open and close the bus to transfer current under a certain conversion voltage. However, when opening and closing the bus to transfer current, a high-temperature arc will be generated between the moving and static contacts, which will cause the contacts, contact fingers, and shielding to burn, causing current-carrying and break insulation failures.

[0003] In addition, the decomposition products of the gas and the splashes of the arc will contaminate the solid insulation parts and produce surface flashover discharge, posing a great safety hazard to equipment and personnel. At the same time, when the busbar of a large-capacity, environmentally friendly switch switches switches current, the arcing time is long and the arc energy is large, causing serious erosion of the arc contacts. The contact fingers also have varying degrees of burnt loss after the arc contacts are eroded, causing electric field problems at the isolation fracture.

[0004] Therefore, how to avoid damage to the contact system caused by high-temperature arcs and reduce the probability of insulation failure caused by current carrying and fracture has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a contact system for a high-voltage switchgear to avoid damage to the contact system by a high-temperature arc and to reduce the probability of insulation failures of current carrying and breaking.

[0006] Another object of the present invention is to provide a high voltage switchgear having the above contact system.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A contact system for a high voltage switchgear, comprising:

[0009] A moving contact, the moving contact comprising a conductive member and a moving arc contact arranged on the conductive member;

[0010] A stationary contact system, wherein the stationary contact system comprises a first stationary contact system and a second stationary contact system, wherein the first stationary contact system is used to contact the moving arc contact when opening the switch, the first stationary contact system is provided with a first elastic component, the second stationary contact system and the end of the moving arc contact are provided with a concave-convex matching structure, the second stationary contact system is provided with a second elastic component, the second stationary contact system is provided with an accommodating cavity, the first stationary contact system is located in the accommodating cavity of the second stationary contact system, and the first stationary contact system and the inner wall of the second stationary contact system are slidably matched;

[0011] A static side shielding assembly is provided with a static main contact finger, and the static main contact finger is used to contact the conductive member when the switch is closed. The static side shielding assembly cooperates with the second static contact system to form a narrow channel.

[0012] Optionally, in the above-mentioned contact system for high-voltage switchgear, the first stationary contact system comprises a first stationary arc contact and a first contact seat connected to the first stationary arc contact, and the first contact seat is connected to the first elastic component;

[0013] The second static contact system comprises a second static arc contact and a second contact seat connected to the second static arc contact, the second contact seat is connected to the second elastic component, and the first contact seat is slidably matched with the inner wall of the second contact seat;

[0014] The static side shielding assembly comprises a static shield and a protective cover arranged on the static shield, the protective cover cooperates with the second static arc contact to form a narrow channel, and the static shield is connected to the static side conductor.

[0015] Optionally, in the above-mentioned contact system for high-voltage switchgear, an airflow structure is provided on the first static contact system, the airflow structure comprises an airflow hole provided on the first contact seat and a first airflow channel provided on the first static arc contact and connected to the airflow hole, the airflow hole on the first contact seat is used to communicate with the air cavity formed between the first contact seat and the second contact seat when opening the switch;

[0016] The first contact seat is provided with a second air flow channel, and the first static arc contact is fastened to the first contact seat, and the first air flow channel and the second air flow channel of the first static arc contact are respectively communicated with the air cavity.

[0017] Optionally, in the above-mentioned contact system for high-voltage switchgear, the moving arc contact is made of ablation-resistant material, the moving arc contact is a convex structure, and the end of the moving arc contact is provided with a first matching hole matching with the first static arc contact, the end of the first static arc contact is provided with ablation-resistant static arc contact piece, the end of the static arc contact piece is a contact finger petal structure, and the inner diameter of the first matching hole is smaller than the outer diameter of the static arc contact piece;

[0018] The second static arc contact is made of ablation-resistant material, is a concave structure that cooperates with the convex structure of the moving arc contact, and a second matching hole that cooperates with the first static arc contact is provided at the center position of the second static arc contact, and the outer diameter of the second static arc contact is smaller than the inner diameter of the static main contact finger.

[0019] Optionally, in the above-mentioned contact system for high-voltage switchgear, the protective cover is made of ablation-resistant material, the outer surface of the protective cover is an arc-shaped structure, and the protective cover is flush with the second static arc contact, the protective cover is located at the front end of the static main contact finger, and there is a first gap between the protective cover and the static main contact finger, and the inner diameter of the protective cover is larger than the inner diameter of the static main contact finger.

[0020] Optionally, in the above-mentioned contact system for high-voltage switchgear, the first mating holes of the static arc contact and the moving arc contact are respectively provided with mutually matching rounded portions, straight portions and chamfered portions. The first static arc contact and the moving arc contact are in contact through the rounded portions in the initial closing state for centering and plug-in fitting. The first static arc contact and the moving arc contact are in contact through the straight portion during the closing process to increase the contact area. The moving arc contact and the first static arc contact move synchronously through the chamfered portions in the opening state.

[0021] Optionally, in the above-mentioned contact system for high-voltage switchgear, the first elastic component includes a first guide rod and a first reset elastic member sleeved on the first guide rod, the first end of the first guide rod is provided with a support portion for supporting the first reset elastic member, the second end of the first guide rod is sleeved with a guide cover on the outer side, and the first guide rod is slidably matched with the guide cover, the second end of the first guide rod is threadedly connected to the first contact seat, and the first reset elastic member is located between the guide cover and the support portion of the first guide rod.

[0022] Optionally, in the above-mentioned contact system for high-voltage switchgear, the second elastic component is located in the inner cavity of the static shield, a second gap is provided between the inner cavity of the static shield and the second contact seat, and the second elastic component includes a second guide rod and a second reset elastic member sleeved on the second guide rod, a first support ring is provided at the first end of the second guide rod, a second support ring is provided at the second end of the second guide rod, and the second reset elastic member is located between the first support ring and the second support ring, the first support ring is threadedly connected to the second contact seat, and the second support ring is threadedly connected to the second guide rod.

[0023] Optionally, in the above-mentioned contact system for high-voltage switchgear, the first end of the second guide rod is provided with a mounting groove for accommodating the first guide rod, and the first end of the second guide rod is provided with an internal thread, and the first end of the second guide rod is threadedly connected to the guide cover; the second end of the second guide rod is provided with an internal thread, and the second end of the second guide rod is coated with a highly conductive material, and the second end of the second guide rod is fastened to the static side conductor.

[0024] Optionally, in the above-mentioned contact system for high-voltage switchgear, the outer wall of the first contact seat is provided with a first guide groove and a contact finger groove, a guide ring is provided in the first guide groove, the first contact seat is slidably matched with the inner wall of the second contact seat through the guide ring, a contact finger is provided in the contact finger groove, and the first contact seat contacts with the inner wall of the second contact seat through the contact finger;

[0025] The end face of the first end of the second contact seat is coated with a highly conductive material, and the first end of the second contact seat is fastened to the second static arc contact; the inner wall of the second end of the second contact seat is provided with a contact groove and a second guide groove which are in contact with the outer wall of the second guide rod, and the second contact seat is slidably matched with the second guide rod.

[0026] A high-voltage switchgear comprises a contact system, wherein the contact system is a contact system for a high-voltage switchgear as described in any one of the above items.

[0027] The contact system for high-voltage switchgear provided by the present invention is provided with a first static contact system and a second static contact system, and a concave-convex structure is provided at the end of the second static contact system and the moving arc contact, so that the distance between the second static contact system and the end of the moving arc contact is smaller than the distance between the moving arc contact and the static main contact finger provided in the static side shielding assembly, thereby the pre-breakdown arc is limited between the second static contact system and the end of the moving arc contact, and will not burn the static main contact finger, and a second elastic component is provided on the second static contact system to ensure a reliable connection between the second static contact system and the moving arc contact after closing the switch, and at the same time, the static side shielding assembly and the second static contact system cooperate to form a narrow channel, which can prevent the arc from drifting into the static side shielding assembly and burning the static main contact finger without hindering the movement of the second static contact system, and the static side shielding assembly and the second static contact system can effectively attract the arc to the surface of the static side shielding assembly or the second static contact system by providing the static side shielding assembly and the second static contact system, effectively protecting the static main contact finger, thereby ensuring the stability and reliability of current flow.

[0028] When the circuit breaker is closed, the concave-convex structure arranged at the end of the second static contact system and the moving arc contact can effectively limit the pre-breakdown arc to the end of the second static contact system and the moving arc contact. At the same time, the narrow channel between the static side shielding assembly and the second static contact system is utilized to further prevent the arc drift from burning the static main contact fingers.

[0029] When opening the circuit breaker, the first static contact system quickly separates from the moving arc contact under the drive of the first elastic component, and after opening the circuit breaker, the first static contact system can enter the accommodating cavity of the second static contact system, so that the second static contact system can play an insulating shielding role for the ablated first static contact system, thereby fully ensuring the reliability of the isolation fracture electric field.

[0030] Compared with the prior art, the contact system for high-voltage switchgear provided by the present invention has a concave-convex structure arranged at the end of the second static contact system and the moving arc contact, so that the pre-breakdown arc is limited between the end of the second static contact system and the moving arc contact, thereby reducing the risk of the static main contact fingers being burned. At the same time, by arranging the static side shielding assembly and the second static contact system, the arc can be effectively attracted to the surface of the static side shielding assembly or the second static contact system, thereby effectively protecting the static main contact fingers and ensuring the stability and reliability of the current flow, thereby avoiding damage to the contact system by high-temperature arcs and reducing the probability of insulation failures in current carrying and fractures. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the structure of a contact system provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of the contact system opening limit position provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of the closing process of the contact system provided by an embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram of a contact system in a just-closed position provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the structure of the closing limit position of the contact system provided by an embodiment of the present invention;

[0037] Figure 6 A schematic structural diagram of a contact system in a just-opened position provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of the structure of the contact system opening and arc extinguishing provided by an embodiment of the present invention;

[0039] Figure 8 A schematic structural diagram of a stationary contact system provided by an embodiment of the present invention;

[0040] Fig. 9 A schematic structural diagram of a first stationary contact system provided in an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of the structure in which a moving arc contact contacts a first stationary arc contact provided in an embodiment of the present invention.

[0042] Wherein, 100 is a moving contact, 101 is a conductive member, 102 is a moving arc contact, 1021 is a first matching hole, 1022 is a first rounded portion, 1023 is a first straight portion, and 1024 is a first chamfered portion;

[0043] 200 is a first static contact system, 201 is a first elastic component, 2011 is a first guide rod, 2012 is a first reset elastic member, 2013 is a support portion, 2014 is a guide cover, 202 is a first static arc contact, 2021 is a first airflow channel, 2022 is a static arc contact member, 2023 is a second rounded portion, 2024 is a second straight portion, 2025 is a second chamfered portion, 203 is a first contact seat, 2031 is an airflow hole, 2032 is a second airflow channel, 2033 is a first guide groove, and 2034 is a contact finger groove;

[0044] 300 is a second static contact system, 301 is a second elastic component, 3011 is a second guide rod, 3012 is a second reset elastic member, 3013 is a first support ring, 3014 is a second support ring, 3015 is a mounting groove, 302 is a second static arc contact, 3021 is a second matching hole, 303 is a second contact seat, 3031 is a contact groove, 3032 is a second guide groove, and 304 is an air cavity;

[0045] 400 is a static side shielding assembly, 401 is a static main contact finger, 402 is a static shielding, 403 is a protective cover, and 404 is a static side conductor. DETAILED DESCRIPTION

[0046] The core of the present invention is to provide a contact system for high-voltage switchgear to avoid damage to the contact system by high-temperature arcs and reduce the probability of current carrying and insulation failure of the break.

[0047] Another core of the present invention is to provide a high-voltage switchgear having the above-mentioned contact system.

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] like Figure 1As shown, the embodiment of the present invention discloses a contact system for high-voltage switchgear, including a moving contact 100, a static contact system and a static side shielding assembly 400. It should be noted that in the prior art, when the busbar is opened and closed to convert current, a high-temperature arc will be generated between the moving and static contacts, which will cause the contact, contact finger, and shield to burn, causing current-carrying and fracture insulation failure. In addition, the decomposition products of the gas and the splash of the arc will contaminate the solid insulation parts, produce surface flashover discharge, and cause a large safety hazard to equipment and personnel. At the same time, when the busbar of a large-capacity, environmentally friendly switch is opened and closed to convert current, the arcing time is long and the arc energy is large, causing serious ablation of the arc contact, and the contact finger is also burned to varying degrees after the arc contact is ablated, thereby causing an electric field problem of the isolation fracture. Improving the ablation resistance of large current by improving the arc contact material has limited effect, and the arcing time cannot be effectively reduced, and the arc energy cannot be effectively suppressed, so that the surface of the arc contact deteriorates after multiple ablation, and the arcing time is further increased, aggravating the ablation defect of the arc contact. The contact system for high-voltage switchgear disclosed in the present invention has a concave-convex structure arranged at the end of the second static contact system 300 and the moving arc contact 102, so that the pre-breakdown arc is limited between the end of the second static contact system 300 and the moving arc contact 102, thereby reducing the risk of the static main contact finger 401 being burned. At the same time, by arranging the static side shielding assembly 400 and the second static contact system 300, the arc can be effectively attracted to the surface of the static side shielding assembly 400 or the second static contact system 300, effectively protecting the static main contact finger 401, ensuring the stability and reliability of the current flow, thereby avoiding damage to the contact system by high-temperature arcs and reducing the probability of insulation failures in current carrying and fractures. In addition, the first static contact system 200 is driven by the first elastic component 201 to quickly disengage from the moving arc contact 102 and compress the air cavity 304 between the second contact seat 303, thereby forming the ability of dynamic and static dual-action acceleration and air blowing to extinguish the arc, effectively improving the heat dissipation and cooling effect on the large-capacity arc column, effectively reducing the arcing time, inhibiting the ablation of the arc contact by the arc energy, and quickly restoring the dielectric strength, thereby achieving effective breaking, avoiding the decomposition products of the gas and the splashes of the arc from contaminating the solid insulating parts, causing surface flashover discharge, and causing safety hazards to equipment and personnel.

[0050] Among them, Figure 1 As shown, the moving contact 100 includes a conductive member 101 and a moving arc contact 102 disposed on the conductive member 101, and when in the opening limit position, the moving contact 100 is disposed inside the moving shielding end surface to ensure that effective insulation shielding can be obtained after electrical wear, such as Figure 2At the same time, the static contact system includes a first static contact system 200 and a second static contact system 300. The first static contact system 200 is used to contact the moving arc contact 102 when opening the switch to avoid the generation of a pre-breakdown arc when the moving arc contact 102 is separated from the second static contact system 300. The first static contact system 200 is provided with a first elastic component 201 to ensure the rapid separation of the first static contact system 200 from the moving arc contact 102. The second static contact system 300 and the end of the moving arc contact 102 are provided with a concave-convex matching structure, so that the pre-breakdown arc is limited between the second static contact system 300 and the end of the moving arc contact 102. The head system 300 is provided with a second elastic component 301 to ensure a reliable connection between the second static contact system 300 and the moving arc contact 102 after closing the circuit breaker. The second static contact system 300 is provided with a accommodating cavity. The first static contact system 200 is located in the accommodating cavity of the second static contact system 300, and the first static contact system 200 and the inner wall of the second static contact system 300 are slidably matched. When opening the circuit breaker, the first static contact system 200 can enter the accommodating cavity of the second static contact system 300, so that the second static contact system 300 plays an insulating shielding role for the first static contact system 200 after ablation, thereby fully ensuring the reliability of the isolation fracture electric field.

[0051] Furthermore, if Figure 1 As shown, a static main contact finger 401 is provided in the static side shielding assembly 400. The static main contact finger 401 is used to contact the conductive member 101 when the switch is closed, and plays the main role of large current flow to ensure the stability of large current flow. The static side shielding assembly 400 cooperates with the second static contact system 300 to form a narrow channel. When the circuit breaker is closed, the concave-convex structure provided at the end of the second static contact system 300 and the moving arc contact 102 makes the distance between the second static contact system 300 and the end of the moving arc contact 102 smaller than the distance between the moving arc contact 102 and the static main contact finger 401 provided in the static side shielding assembly 400, which can effectively limit the pre-breakdown arc to the end of the second static contact system 300 and the moving arc contact 102. At the same time, the narrow passage between the static side shielding assembly 400 and the second static contact system 300 is utilized to prevent the arc from drifting into the static side shielding assembly 400 to burn the static main contact finger 401 without hindering the movement of the second static contact system 300, thereby further protecting the static main contact finger 401 from burning. Figure 3 and Figure 4 As shown, until the static main contact finger 401 contacts the conductive member 101 of the moving contact 100, the closing process is completed. Figure 5 When the switch is opened, after the second static contact system 300 is separated from the moving arc contact 102, since the first static contact system 200 and the moving arc contact 102 are still in contact, no pre-breakdown arc is generated when the moving arc contact 102 is separated from the second static contact system 300. Figure 6As shown, the first static contact system 200 is driven by the first elastic component 201 to quickly separate from the moving arc contact 102. After the switch is opened, the first static contact system 200 can enter the accommodating cavity of the second static contact system 300, as shown in FIG. Figure 2 As shown, the second static contact system 300 plays an insulating shielding role for the first static contact system 200 after ablation, fully ensuring the reliability of the electric field of the isolation break, effectively protecting the static main contact finger 401, ensuring the stability and reliability of the current flow, thereby avoiding the damage of the contact system to the high-temperature arc, and reducing the probability of insulation failure of the current carrier and the break. It should be noted that the occurrence of the arc is determined by the size of the electric field between each other. If the electric field is greater than the air gap breakdown field strength, a breakdown arc will be generated. According to E=U / D, where D is the distance, U is the voltage, and E is the field strength, it can be seen that when the voltage is constant, the smaller the distance, the greater the electric field strength. Therefore, the breakdown position is guaranteed to be within the concave-convex structure set at the end of the second static contact system 300 and the moving arc contact 102, thereby preventing the pre-breakdown arc from entering the static side shielding assembly 400 to ablate the static main contact finger 401.

[0052] The contact system for high-voltage switchgear disclosed in the present invention is provided with a first static contact system 200 and a second static contact system 300, and a concave-convex structure is provided at the end of the second static contact system 300 and the moving arc contact 102, so that the distance between the second static contact system 300 and the end of the moving arc contact 102 is smaller than the distance between the moving arc contact 102 and the static main contact finger 401 provided in the static side shielding assembly 400, thereby limiting the pre-breakdown arc between the second static contact system 300 and the end of the moving arc contact 102, and will not burn the static main contact finger 401, and a second static contact system 300 is provided on the second static contact system 300. The elastic component 301 ensures a reliable connection between the second static contact system 300 and the moving arc contact 102 after closing the circuit breaker. At the same time, the static side shielding component 400 and the second static contact system 300 cooperate to form a narrow channel. Without hindering the movement of the second static contact system 300, it can prevent the arc from drifting into the static side shielding component 400 and burning the static main contact finger 401. By setting the static side shielding component 400 and the second static contact system 300, the arc can be effectively attracted to the surface of the static side shielding component 400 or the second static contact system 300, and the static main contact finger 401 is effectively protected, thereby ensuring the stability and reliability of current flow.

[0053] When the circuit breaker is closed, the concave-convex structure arranged at the end of the second static contact system 300 and the moving arc contact 102 can effectively limit the pre-breakdown arc to the end of the second static contact system 300 and the moving arc contact 102. At the same time, the narrow channel between the static side shielding assembly 400 and the second static contact system 300 is utilized to further prevent the arc drift from burning the static main contact finger 401.

[0054] When opening the circuit breaker, the first static contact system 200 is driven by the first elastic component 201 to quickly disengage from the moving arc contact 102, and after opening the circuit breaker, the first static contact system 200 can enter the accommodating cavity of the second static contact system 300, so that the second static contact system 300 can play an insulating shielding role for the ablated first static contact system 200, thereby fully ensuring the reliability of the isolation fracture electric field.

[0055] Compared with the prior art, the contact system for high-voltage switchgear disclosed in the present invention has a concave-convex structure arranged at the end of the second static contact system 300 and the moving arc contact 102, so that the pre-breakdown arc is limited between the end of the second static contact system 300 and the moving arc contact 102, thereby reducing the risk of the static main contact finger 401 being burned. At the same time, by setting the static side shielding assembly 400 and the second static contact system 300, the arc can be effectively attracted to the surface of the static side shielding assembly 400 or the second static contact system 300, effectively protecting the static main contact finger 401, ensuring the stability and reliability of current flow, thereby avoiding damage to the contact system by high-temperature arc and reducing the probability of insulation failure of current carrying and fracture.

[0056] Furthermore, if Figure 6 , Figure 7 and Fig. 9 As shown, in a specific embodiment, the first static contact system 200 includes a first static arc contact 202 and a first contact seat 203 connected to the first static arc contact 202, the first contact seat 203 is connected to the first elastic component 201, and an airflow structure is arranged on the first static contact system 200, the airflow structure includes an airflow hole 2031 arranged on the first contact seat 203 and a first airflow channel 2021 arranged on the first static arc contact 202 and connected to the airflow hole 2031, when the switch is opened, an air cavity 304 is formed between the first contact seat 203 and the second contact seat 303, and the airflow hole 2031 on the first contact seat 203 is connected to the air cavity 304, and at the same time, a second airflow channel 2032 is arranged on the first contact seat 203, and the first static arc contact 202 is fastened to the first contact seat 203, and the first airflow channel 2021 and the second airflow channel 2032 of the first static arc contact 202 are respectively connected to the air cavity 304 formed when the switch is opened. like Figure 7As shown, when the switch is opened, the first static arc contact 202 and the first contact seat 203 are quickly separated from the moving arc contact 102 under the drive of the first elastic component 201, and at the same time, the air cavity 304 formed between the second contact seat 303 is compressed, so that the airflow formed by the compressed air cavity 304 is blown from the air flow hole 2031 on the first contact seat 203 through the second air flow channel 2032 and the first air flow channel 2021 to the position where the first static arc contact 202 is separated from the moving arc contact 102, thereby achieving the effect of air blowing out the arc, and the blown air flow can push the moving arc contact 102 to quickly separate, thereby forming the effect of speeding up the separation of both static and dynamic movements, effectively improving the heat dissipation and cooling of the large-capacity arc column, reducing the arcing time, and suppressing the ablation of the arc contact by the arc energy, so as to achieve the rapid recovery of the dielectric strength and the effective opening and closing of the contact system.

[0057] Furthermore, if Figure 8 and Fig. 9 As shown, the second static contact system 300 includes a second static arc contact 302 and a second contact seat 303 connected to the second static arc contact 302, the second contact seat 303 is connected to the second elastic component 301, the first contact seat 203 is slidably matched with the inner wall of the second contact seat 303, and a first guide groove 2033 and a contact finger groove 2034 are provided on the outer wall of the first contact seat 203, a guide ring is provided in the first guide groove 2033, the first contact seat 203 is slidably matched with the inner wall of the second contact seat 303 through the guide ring, thereby guiding the first contact seat 203, a contact finger is provided in the contact finger groove 2034, the first contact seat 203 contacts with the inner wall of the second contact seat 303 through the contact finger, to ensure reliable contact and flow of arc current.

[0058] Furthermore, if Figure 1As shown, the static side shielding assembly 400 includes a static shield 402 and a protective cover 403 arranged on the static shield 402, and the protective cover 403 cooperates with the second static arc contact 302 to form a narrow channel to prevent the arc from drifting into the protective cover 403 and burning the static main contact finger 401, and the static shield 402 is connected to the static side conductor 404, and the static main contact finger 401 is connected to the static shield 402. The protective cover 403 is made of ablation-resistant material, and the outer surface of the protective cover 403 is an arc-shaped structure, and the protective cover 403 is flush with the second static arc contact 302. The protective cover 403 is located at the front end of the static main contact 401. At the same time, there is a first gap between the protective cover 403 and the static main contact 401, and the inner diameter of the protective cover 403 is larger than the inner diameter of the static main contact 401 to ensure that the outer diameter of the moving contact 100 does not contact the protective cover 403 when the switch is closed and inserted, and directly contacts the static main contact 401. The narrow channel formed by the protective cover 403 and the second static arc contact 302 can prevent the arc from drifting into the ablated static main contact 401, and the static shield 402, the protective cover 403 and the second static arc contact 302 are flush with each other, ensuring that the electric field distribution at the static side end face of the fracture is more uniform. It should be noted that the ablation-resistant material can be made of copper tungsten 80 or above. Relevant technical personnel in this field can understand that the use of ablation-resistant materials will lead to a decrease in current carrying capacity. Therefore, in order to ensure the current carrying capacity and current carrying stability of large currents, the static main contact finger 401 that plays a major role in current carrying is generally not made of ablation-resistant material. In this embodiment, by setting the protective cover 403 at the front end of the static main contact finger 401 and setting it flush with the second static arc contact 302, the pre-breakdown arc generated during the closing and opening process cannot contact the static main contact finger 401, thereby avoiding the static main contact finger 401 from being ablated, effectively protecting the static main contact finger 401, thereby avoiding damage to the contact system by high-temperature arc, and reducing the probability of insulation failure of current carrying and break.

[0059] Furthermore, if Figure 1 As shown, in a specific embodiment, the moving arc contact 102 and the second static arc contact 302 are both made of ablation-resistant materials, and the moving arc contact 102 adopts a convex structure, and the second static arc contact 302 adopts a concave structure that matches the convex structure of the moving arc contact 102, and at the same time, a first matching hole 1021 that matches the first static arc contact 202 is provided at the end of the moving arc contact 102, and a first matching hole 1021 that matches the first static arc contact 202 is provided at the center of the second static arc contact 302. The outer diameter of the second static arc contact 302 is smaller than the inner diameter of the static main contact finger 401 in the matching second matching hole 3021, so as to ensure that when the moving contact 100 pushes the second static arc contact 302 during the closing insertion, the second static arc contact 302 is not affected by the static main contact finger 401, and the convex end surface of the convex structure of the moving arc contact 102 contacts the concave end surface of the concave structure of the second static arc contact 302, so that the closing alignment of the moving contact 100 is facilitated by the matching of the concave and convex surfaces.

[0060] Among them, Fig. 9 and Fig.10 As shown, the end of the first static arc contact 202 is provided with an ablation-resistant static arc contact piece 2022, the end of the static arc contact piece 2022 is a contact finger petal-shaped structure, a first airflow channel 2021 is formed at the center of the contact finger petal-shaped structure, and is communicated with the second airflow channel 2032 provided on the first contact seat 203, and the inner diameter of the first matching hole 1021 is smaller than the outer diameter of the static arc contact piece 2022. Specifically, the static arc contact piece 2022 and the first matching hole 1021 of the moving arc contact 102 are respectively provided with a rounded portion, a straight portion and a chamfered portion that match each other. For ease of understanding, the rounded portion, straight portion and chamfered portion provided on the first matching hole 1021 of the moving arc contact 102 are respectively defined as the first rounded portion 1022, the first straight portion 1023 and the first chamfered portion 1024, and the rounded portion, straight portion and chamfered portion provided on the stationary arc contact 2022 are respectively defined as the second rounded portion 2023, the second straight portion 2024 and the second chamfered portion 2025. Figure 4 As shown in the figure, when in the initial state of closing, i.e., the just-closed position, the first rounded portion 1022 of the moving arc contact 102 contacts the second rounded portion 2023 of the static arc contact 2022, so that the guiding pressure and friction are small, which is convenient for the centering and plug-in matching of the moving arc contact 102 and the first static arc contact 202; when the closing process continues, the first straight portion 1023 of the moving arc contact 102 contacts the second straight portion 2024 of the static arc contact 2022, and radial compressive elastic deformation is generated to increase the contact area and ensure reliable surface contact; as shown in the figure, the first rounded portion 1022 of the moving arc contact 102 contacts the second straight portion 2024 of the static arc contact 2022, so as to increase the contact area and ensure reliable surface contact; Figure 5 As shown, after closing, the first chamfered portion 1024 of the moving arc contact 102 and the second chamfered portion 2025 of the static arc contact 2022 are stably separated and no longer electrically connected. At this time, the static main contact finger 401 is connected to the conductive member 101 of the moving contact 100 to ensure reliable flow of the main circuit. Figure 6As shown, when the switch is opened, the first chamfered portion 1024 of the moving arc contact 102 squeezes the contact finger petal structure of the static arc contact 2022, and under the action of the contact force, the first static arc contact 202 is pulled to move synchronously with the moving contact 100, so as to realize the synchronous pulling and opening movement of the first static arc contact 202 and the first contact seat 203, and at the same time, the air flow returns from the first air flow channel 2021 of the first static arc contact 202 and the second air flow channel 2032 of the first contact seat 203 to the air cavity 304 until the first static arc contact 202 and the first contact seat 203 are closed. Driven by the first elastic component 201, the first elastic component 201 quickly separates from the moving arc contact 102, and at the same time compresses the air cavity 304 formed between the first elastic component 201 and the second contact seat 303, so that the airflow formed by the compressed air cavity 304 is blown from the air hole 2031 on the first contact seat 203 to the position where the first static arc contact 202 separates from the moving arc contact 102 through the second airflow channel 2032 and the first airflow channel 2021, respectively, to achieve the effect of air blowing out the arc, and the blown airflow can push the moving arc contact 102 to quickly separate, thereby forming the effect of dynamic and static dual-action speed-up separation.

[0061] Furthermore, if Figure 8As shown, in a specific embodiment, the first elastic component 201 includes a first guide rod 2011 and a first reset elastic member 2012 sleeved on the first guide rod 2011, the first end of the first guide rod 2011 is provided with a support portion 2013 supporting the first reset elastic member 2012, the second end of the first guide rod 2011 is sleeved with a guide cover 2014 on the outer side, and the first guide rod 2011 and the guide cover 2014 are slidably matched, the second end of the first guide rod 2011 is threadedly connected to the first contact seat 203 to ensure that the moving contact 100 can drive the first contact seat 203 to move while driving the first guide rod 2011 to slide, and the first reset elastic member 2012 is located between the guide cover 2014 and the support portion 2013 of the first guide rod 2011. The second elastic component 301 is located in the inner cavity of the static shield 402, and a second gap is provided between the inner cavity of the static shield 402 and the second contact seat 303, so that the movement of the second contact seat 303 is radially limited by the inner cavity of the static shield 402, and the second elastic component 301 includes a second guide rod 3011 and a second reset elastic member 3012 sleeved on the second guide rod 3011, a first support ring 3013 is provided at the first end of the second guide rod 3011, a second support ring 3014 is provided at the second end of the second guide rod 3011, and the second reset elastic member 3012 is located between the first support ring 3013 and the second support ring 3014, the first support ring 3013 is threadedly connected to the second contact seat 303, and the second support ring 3014 is threadedly connected to the second guide rod 3011. Among them, the first end of the second guide rod 3011 is provided with a mounting groove 3015 for accommodating the first guide rod 2011, and the first end of the second guide rod 3011 is provided with an internal thread, the first end of the second guide rod 3011 is threadedly connected to the guide cover 2014, and the second end of the second guide rod 3011 is provided with an internal thread, and the second end of the second guide rod 3011 is coated with a highly conductive material, and the second end of the second guide rod 3011 is fastened to the static side conductor 404.

[0062] Specifically, the first return elastic member 2012 adopts a first spring, the second return elastic member 3012 adopts a second spring, and a central through hole is provided in the middle of the guide cover 2014, the first guide rod 2011 and the central through hole of the guide cover 2014 are slidably matched, and the first end of the second guide rod 3011 is threadedly connected to the guide cover 2014 to form a closed mounting groove 3015 for accommodating the first guide rod 2011. When opening the circuit breaker, the first chamfered portion 1024 of the moving arc contact 102 squeezes the static arc contact 2022, and under the action of the contact force, pulls the first static arc contact 202 to move synchronously with the moving contact 100, thereby realizing the synchronous pulling opening movement of the first static arc contact 202 and the first contact seat 203. The outer wall of the guide cover 2014 has a radial limiting function for the second contact seat 303 during opening, thereby ensuring the axial movement of the second static contact system 300, and ensuring that under the thrust of the second reset elastic member 3012, the end face distance between the second static arc contact 302 and the protective cover 403 maintains the original set position at the opening limit position, such as Figure 2 At the same time, the inner end surface of the guide cover 2014 plays an axial limiting role in the opening process of the first guide rod 2011 follower contact 100, ensuring that the first static arc contact 202 meets the requirements of the just-opening position, such as Figure 6 shown.

[0063] like Figure 3 As shown, when the contact system is in the process of closing movement, the moving contact 100 extends out of the moving shield, approaches the second static arc contact 302 and generates a pre-breakdown arc. Since the distance between the moving arc contact 102 of the moving contact 100 and the second static arc contact 302 is the smallest, the pre-breakdown arc is limited between the convex end surface of the convex structure of the moving arc contact 102 and the concave end surface of the concave structure of the second static arc contact 302. At the same time, a narrow channel is formed between the protective cover 403 and the second static arc contact 302, which further blocks the arc drift from burning the static main contact finger 401 while ensuring that the movement of the second static arc contact 302 is not affected. The moving contact 100 continues to move in the direction close to the second static arc contact 302 until the moving arc contact 102 of the moving contact 100 contacts the second static arc contact 302, that is, when the contact system is in the just-closed position, as shown in FIG. Figure 4 As shown, the convex end surface of the moving arc contact 102 cooperates with the concave end surface of the second static arc contact 302 to facilitate the closing and centering of the moving contact 100. At this time, the moving contact 100 continues to move to the right ( Figure 4From the perspective of the moving arc contact 102, the first rounded portion 1022 of the first matching hole 1021 of the moving arc contact 102 contacts the second rounded portion 2023 of the static arc contact 2022, so that the guiding pressure and friction are small, and the centering and plugging of the moving arc contact 102 and the first static arc contact 202 are completed; when continuing to move to the right, the first straight portion 1023 of the first matching hole 1021 of the moving arc contact 102 contacts the second straight portion 2024 of the static arc contact 2022, and radial compressive elastic deformation is generated to increase the contact area and ensure reliable surface contact; Figure 5 As shown, after the circuit breaker is closed, the first chamfered portion 1024 of the first matching hole 1021 of the moving arc contact 102 is stably separated from the second chamfered portion 2025 of the static arc contact 2022. At the same time, the moving arc contact 102 drives the second static arc contact 302 and the second contact seat 303 to move rightward ( Figure 4 perspective), and compress the second resetting elastic member 3012 to store energy, so that before the static main contact finger 401 contacts the conductive member 101 of the moving contact 100, reliable contact between the moving arc contact 102 and the second static arc contact 302 can be ensured during the closing process, and reliable current transfer from the second static arc contact 302 to the conductive member 101 is achieved, until the static main contact finger 401 is connected to the conductive member 101 of the moving contact 100, ensuring reliable flow of the main circuit, completing the closing action, that is, the contact system is in the closing limit position, such as Figure 5 It should be noted that, in the process from the contact system being in the opening limit position to the closing limit position, the first resetting elastic member 2012 is always in a pre-compression state, thereby ensuring that the first static arc contact 202 and the first contact seat 203 remain in a fixed position in the above process.

[0064] like Figure 6 As shown, when the contact system is opened, from the closing limit position to the just-opening position, the moving contact 100 moves to the left ( Figure 6 perspective), the static main contact finger 401 is first separated from the conductive member 101 of the moving contact 100. During this process, the second reset elastic member 3012 continuously releases the closing energy, and pushes the second static arc contact 302 to reliably contact the moving arc contact 102 during the opening process, thereby realizing reliable current transfer from the conductive member 101 to the second static arc contact 302. At the same time, the moving arc contact 102 uses the first chamfered portion 1024 of the first matching hole 1021 to squeeze the contact finger petal-shaped structure of the static arc contact member 2022 of the first static arc contact 202, and realizes the synchronous traction opening movement of the first static arc contact 202 and the first contact seat 203 under the action of the contact force. The airflow returns to the air cavity 304 from the first airflow channel 2021 of the first static arc contact 202 and the second airflow channel 2032 of the first contact seat 203. At this time, the first reset elastic member 2012 is converted from the pre-compression state to the compression state. When the moving contact 100 continues to move to the left ( Figure 6perspective), that is, in the process from the just-opening position to the opening limit position, the first static arc contact 202 moves to the left ( Figure 6 The first resetting elastic member 2012 is continuously compressed, and at the same time, the contact finger petal structure of the static arc contact member 2022 and the first matching hole 1021 of the moving arc contact 102 produce radial compressive elastic deformation, until the energy storage pulling force of the first resetting elastic member 2012 is greater than the critical point of radial compressive elastic deformation and friction between the contact finger petal structure and the first matching hole 1021 of the moving arc contact 102, and the first static arc contact 202 and the first contact seat 203 are quickly separated from the moving arc contact 102 under the drive of the first resetting elastic member 2012. At this time The first reset elastic member 2012 returns to the pre-compression state, and at the same time, the first contact seat 203 compresses the air cavity 304 between the first contact seat 203 and the second contact seat 303, and forms an air blowing airflow between the first static arc contact 202 and the moving arc contact 102, so as to blow out the arc generated when the first static arc contact 202 is separated from the moving arc contact 102, and at the same time, the moving arc contact 102 can be pushed to quickly separate, thereby achieving the effect of speeding up the double action of the moving and static contacts of the switch and blowing out the arc, effectively reducing the arc burning time, and inhibiting the ablation of the arc contact by the arc energy. Figure 7 shown.

[0065] Furthermore, if Figure 8 As shown, the end surface of the first end of the second contact seat 303 is coated with a highly conductive material, and the first end of the second contact seat 303 is tightly connected to the second static arc contact 302. The inner wall of the second end of the second contact seat 303 is provided with a contact groove 3031 and a second guide groove 3032 that are in contact with the outer wall of the second guide rod 3011. The second contact seat 303 and the second guide rod 3011 are slidably matched through the contact fingers arranged in the contact groove 3031 and the guide ring in the second guide groove 3032, wherein the second guide groove 3032 plays a guiding role, and the contact groove 3031 ensures reliable current flow. Figure 4 and Figure 5 As shown, when the moving contact 100 moves to the right ( Figure 4 perspective), pushing the second static arc contact 302 and the second contact seat 303 to move rightward ( Figure 4 The second contact seat 303 slides smoothly under the joint action of the second guide groove 3032 provided on the second contact seat 303 and the first guide groove 2033 provided on the first contact seat 203. At the same time, the contact groove 3031 provided on the second contact seat 303 and the contact finger groove 2034 provided on the first contact seat 203 ensure reliable contact and flow of the second contact seat 303 during sliding.

[0066] An embodiment of the present invention further discloses a high-voltage switch device, including a contact system. The contact system is the contact system for the high-voltage switch device disclosed in the above embodiment, and therefore has all the technical effects of the above-mentioned contact system for the high-voltage switch device, which will not be repeated herein.

[0067] The terms "first" and "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A contact system for a high voltage switchgear, characterized in that: include: A moving contact (100), the moving contact (100) comprising a conductive member (101) and a moving arc contact (102) arranged on the conductive member (101); A stationary contact system, the stationary contact system comprising a first stationary contact system (200) and a second stationary contact system (300), the first stationary contact system (200) being used to contact the moving arc contact (102) when opening the switch, the first stationary contact system (200) being provided with a first elastic component (201), the second stationary contact system (300) and the end of the moving arc contact (102) being provided with a concave-convex matching structure, the second stationary contact system (300) being provided with a second elastic component (301), the second stationary contact system (300) being provided with a receiving cavity, the first stationary contact system (200) being located in the receiving cavity of the second stationary contact system (300), and the first stationary contact system (200) and the inner wall of the second stationary contact system (300) being slidably matched; A static side shielding assembly (400), wherein a static main contact finger (401) is arranged inside the static side shielding assembly (400), and the static main contact finger (401) is used to contact the conductive member (101) when the switch is closed, and the static side shielding assembly (400) cooperates with the second static contact system (300) to form a narrow channel.

2. The contact system for high voltage switchgear according to claim 1, characterized in that: The first stationary contact system (200) comprises a first stationary arc contact (202) and a first contact seat (203) connected to the first stationary arc contact (202), and the first contact seat (203) is connected to the first elastic component (201); The second static contact system (300) comprises a second static arc contact (302) and a second contact seat (303) connected to the second static arc contact (302), the second contact seat (303) being connected to the second elastic component (301), and the first contact seat (203) being slidably matched with the inner wall of the second contact seat (303); The static side shielding assembly (400) comprises a static shield (402) and a protective cover (403) arranged on the static shield (402), the protective cover (403) cooperates with the second static arc contact (302) to form a narrow channel, and the static shield (402) is connected to the static side conductor (404).

3. The contact system for high voltage switchgear according to claim 2, characterized in that: An airflow structure is provided on the first static contact system (200), the airflow structure comprising an airflow hole (2031) provided on the first contact seat (203) and a first airflow channel (2021) provided on the first static arc contact (202) and connected to the airflow hole (2031), the airflow hole (2031) on the first contact seat (203) being used to communicate with an air cavity (304) formed between the first contact seat (203) and the second contact seat (303) when the switch is opened; The first contact seat (203) is provided with a second air flow channel (2032), and the first static arc contact (202) is fastened to the first contact seat (203), and the first air flow channel (2021) and the second air flow channel (2032) of the first static arc contact (202) are respectively connected to the air cavity (304).

4. The contact system for high voltage switchgear according to claim 3, characterized in that: The moving arc contact (102) is made of ablation-resistant material, the moving arc contact (102) is a convex structure, and the end of the moving arc contact (102) is provided with a first matching hole (1021) matching with the first static arc contact (202), the end of the first static arc contact (202) is provided with ablation-resistant static arc contact piece (2022), the end of the static arc contact piece (2022) is a contact finger petal structure, and the inner diameter of the first matching hole (1021) is smaller than the outer diameter of the static arc contact piece (2022); The second static arc contact (302) is made of ablation-resistant material, and is a concave structure that cooperates with the convex structure of the moving arc contact (102). A second matching hole (3021) that cooperates with the first static arc contact (202) is provided at the center of the second static arc contact (302), and the outer diameter of the second static arc contact (302) is smaller than the inner diameter of the static main contact finger (401).

5. The contact system for high voltage switchgear according to claim 4, characterized in that: The protective cover (403) is made of ablation-resistant material, the outer surface of the protective cover (403) is an arc-shaped structure, and the protective cover (403) is flush with the second static arc contact (302), the protective cover (403) is located at the front end of the static main contact finger (401), and there is a first gap between the protective cover (403) and the static main contact finger (401), and the inner diameter of the protective cover (403) is greater than the inner diameter of the static main contact finger (401).

6. The contact system for high voltage switchgear according to claim 4, characterized in that: The first matching holes (1021) of the static arc contact (2022) and the moving arc contact (102) are respectively provided with rounded parts, straight parts and chamfered parts that match each other. The first static arc contact (202) and the moving arc contact (102) are in contact through the rounded parts in the initial state of closing the switch so as to be aligned and plug-fitted. The first static arc contact (202) and the moving arc contact (102) are in contact through the straight parts during the closing process so as to increase the contact area. The moving arc contact (102) and the first static arc contact (202) move synchronously through the chamfered parts in the opening state.

7. The contact system for high voltage switchgear according to claim 2, characterized in that: The first elastic component (201) comprises a first guide rod (2011) and a first reset elastic member (2012) sleeved on the first guide rod (2011); a first end of the first guide rod (2011) is provided with a support portion (2013) for supporting the first reset elastic member (2012); a guide cover (2014) is sleeved on the outer side of the second end of the first guide rod (2011); the first guide rod (2011) and the guide cover (2014) are slidably matched; the second end of the first guide rod (2011) is threadedly connected to the first contact seat (203); and the first reset elastic member (2012) is located between the guide cover (2014) and the support portion (2013) of the first guide rod (2011).

8. The contact system for high voltage switchgear according to claim 7, characterized in that: The second elastic component (301) is located in the inner cavity of the static shield (402), and a second gap is provided between the inner cavity of the static shield (402) and the second contact seat (303). The second elastic component (301) comprises a second guide rod (3011) and a second reset elastic member (3012) sleeved on the second guide rod (3011). A first support ring (3013) is provided at the first end of the second guide rod (3011), and a second support ring (3014) is provided at the second end of the second guide rod (3011). The second reset elastic member (3012) is located between the first support ring (3013) and the second support ring (3014). The first support ring (3013) is threadedly connected to the second contact seat (303), and the second support ring (3014) is threadedly connected to the second guide rod (3011).

9. The contact system for high voltage switchgear according to claim 8, characterized in that: The first end of the second guide rod (3011) is provided with a mounting groove (3015) for accommodating the first guide rod (2011), and the first end of the second guide rod (3011) is provided with an internal thread, and the first end of the second guide rod (3011) is threadedly connected to the guide cover (2014); the second end of the second guide rod (3011) is provided with an internal thread, and the second end of the second guide rod (3011) is coated with a highly conductive material, and the second end of the second guide rod (3011) is tightly connected to the static side conductor (404).

10. The contact system for high voltage switchgear according to claim 8, characterized in that: The outer wall of the first contact seat (203) is provided with a first guide groove (2033) and a contact finger groove (2034); a guide ring is provided in the first guide groove (2033); the first contact seat (203) is slidably matched with the inner wall of the second contact seat (303) through the guide ring; a contact finger is provided in the contact finger groove (2034); the first contact seat (203) is in contact with the inner wall of the second contact seat (303) through the contact finger; The end surface of the first end of the second contact seat (303) is coated with a highly conductive material, and the first end of the second contact seat (303) is fastened to the second static arc contact (302); the inner wall of the second end of the second contact seat (303) is provided with a contact groove (3031) and a second guide groove (3032) that are in contact with the outer wall of the second guide rod (3011), and the second contact seat (303) is slidably matched with the second guide rod (3011).

11. A high voltage switchgear, comprising a contact system, characterized in that: The contact system is a contact system for a high-voltage switchgear according to any one of claims 1 to 10.

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