CN119694814A - A contact system for high voltage switchgear and high voltage switchgear - Google Patents

Abstract

The present invention discloses a contact system for high-voltage switchgear and a high-voltage switchgear, comprising: a moving contact, comprising a conductive member and a moving arc contact; a stationary contact system, comprising a first stationary contact system and a second stationary contact system, 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, and the first stationary contact system is located in the accommodating cavity of the second stationary contact system; a stationary side shielding component is provided with a stationary main contact finger, and the stationary side shielding component cooperates with the second stationary contact system to form a narrow passage. The contact system for high-voltage switchgear provided by the present invention ensures the stability and reliability of current flow through the concave-convex structure provided at the end of the second stationary contact system and the moving arc contact and the stationary side shielding component is provided, thereby reducing the probability of insulation failure of current carrying and fracture.

Description

Contact system for high-voltage switch equipment and high-voltage switch equipment

Technical Field

The present invention relates to the technical field of high-voltage switchgear, and more particularly, to a contact system for a high-voltage switchgear and a high-voltage switchgear.

Background

The isolating switch is an extremely important safety device in the system and is used for safely isolating equipment and lines with power failure from an operation system, so the isolating switch must be provided with a reliable isolating insulation fracture. Meanwhile, a transformer substation often needs to transfer load current from one bus to another bus, and for such operation, an isolating switch is required to have the capability of switching the bus to transfer current at a certain conversion voltage. However, when the switching bus converts current, high-temperature electric arcs are generated between the moving contact and the fixed contact, so that the contact, the contact finger and the shielding are burnt, and current carrying and fracture insulation faults are caused.

In addition, the decomposition products of gas and the splashes of electric arcs pollute the solid insulating part, generate surface flashover discharge, cause great potential safety hazards to equipment and personnel, and meanwhile, when the high-capacity and environment-friendly switch bus conversion current is switched on, the arcing time is longer, the electric arc energy is larger, the serious ablation of an arc contact is caused, and the contact fingers are burnt out to different degrees after the arc contact is ablated, so that the electric field problem of an isolation fracture is caused.

Therefore, how to avoid the damage of the high-temperature arc to the contact system and reduce the probability of insulation faults of current carrying and fracture becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a contact system for a high-voltage switchgear, so as to avoid damage to the contact system caused by high-temperature arc and reduce the probability of insulation failure of current carrying and fracture.

Another object of the invention is to provide a high voltage switchgear with the contact system described above.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a contact system for a high voltage switchgear comprising:

The movable contact comprises a conductive piece and a movable arc contact arranged on the conductive piece;

The fixed contact system comprises a first fixed contact system and a second fixed contact system, wherein the first fixed contact system is used for being in contact with the movable arc contact when the switch is opened, the first fixed contact system is provided with a first elastic component, the second fixed contact system and the end part of the movable arc contact are provided with concave-convex matching structures, the second fixed contact system is provided with a second elastic component, the second fixed contact system is provided with a containing cavity, the first fixed contact system is positioned in the containing cavity of the second fixed contact system, and the first fixed contact system is in sliding fit with the inner wall of the second fixed contact system;

The static side shielding assembly is internally provided with a static main contact finger, the static main contact finger is used for contacting with the conductive piece during closing, and the static side shielding assembly and the second static contact system are matched to form a narrow passage.

Optionally, in the contact system for a high-voltage switch device, the first static contact system includes a first static arc contact and a first contact base connected with the first static arc contact, and the first contact base is connected with the first elastic component;

the second static contact system comprises a second static arc contact and a second contact seat connected with the second static arc contact, the second contact seat is connected with the second elastic component, and the first contact seat is in sliding fit with the inner wall of the second contact seat;

The static side shielding assembly comprises a static shielding and a protective cover arranged on the static shielding, the protective cover is matched with the second static arc contact to form a narrow passage, and the static shielding is connected with the static side conductor.

Optionally, in the contact system for a high-voltage switch device described above, an air flow structure is disposed on the first stationary contact system, the air flow structure includes an air flow hole disposed on the first contact base and a first air flow channel disposed on the first stationary arc contact and communicating with the air flow hole, and the air flow hole on the first contact base is used for communicating with an air cavity formed between the first contact base and the second contact base when the switch is opened;

the first contact seat is provided with a second air flow channel, the first static arc contact is fixedly connected with 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.

Optionally, in the contact system for a high-voltage switch device, the moving arc contact is made of an ablation-resistant material, the moving arc contact is of a convex structure, a first matching hole matched with the first static arc contact is formed in the end part of the moving arc contact, an ablation-resistant static arc contact piece is arranged in the end part of the first static arc contact, the end part of the static arc contact piece is of a contact finger flap structure, and the inner diameter of the first matching hole is smaller than the outer diameter of the static arc contact piece;

the second static arc contact is made of ablation-resistant materials, the second static arc contact is of a concave structure matched with the convex structure of the movable arc contact, a second matching hole matched with the first static arc contact is formed in the center 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.

Optionally, in the contact system for a high-voltage switch device, the protection cover is made of ablation-resistant material, the outer surface of the protection cover is in an arc structure, the protection cover is flush with the second static arc contact, the protection cover is located at the front end of the static main contact finger, a first gap is formed between the protection cover and the static main contact finger, and the inner diameter of the protection cover is larger than that of the static main contact finger.

Optionally, in the contact system for a high-voltage switch device, the first mating holes of the static arc contact piece and the moving arc contact are respectively provided with a rounded portion, a straight line portion and a chamfer portion which are mutually mated, the first static arc contact and the moving arc contact are contacted through the rounded portion in a switching-on initial state so as to be mated in a plugging manner, the first static arc contact and the moving arc contact are contacted through the straight line portion in a switching-on process so as to increase a contact area, and the moving arc contact and the first static arc contact are synchronously moved through the chamfer portion in a switching-off state.

Optionally, in the contact system for a high-voltage switch device, the first elastic component includes a first guide rod and a first reset elastic member sleeved on the first guide rod, a first end of the first guide rod is provided with a supporting part for supporting the first reset elastic member, a second end of the first guide rod is sleeved with a guide cover outside, the first guide rod is in sliding fit with the guide cover, a second end of the first guide rod is in threaded connection with the first contact seat, and the first reset elastic member is located between the guide cover and the supporting part of the first guide rod.

Optionally, in the contact system for a high-voltage switch device, the second elastic component is located in an inner cavity of the static shield, a second gap is formed between the inner cavity of the static shield and the second contact base, the second elastic component includes a second guide rod and a second reset elastic member sleeved on the second guide rod, a first supporting ring is arranged at a first end of the second guide rod, a second supporting ring is arranged at a second end of the second guide rod, the second reset elastic member is located between the first supporting ring and the second supporting ring, the first supporting ring is in threaded connection with the second contact base, and the second supporting ring is in threaded connection with the second guide rod.

Optionally, in the contact system for a high-voltage switch device, a first end of the second guide rod is provided with a mounting groove for accommodating the first guide rod, the first end of the second guide rod is provided with an internal thread, the first end of the second guide rod is in threaded connection with the guide cover, a second end of the second guide rod is provided with an internal thread, the second end of the second guide rod is coated with a high-conductivity material, and the second end of the second guide rod is in fastening connection with the static side conductor.

Optionally, in the contact system for a high-voltage switch device, the outer wall of the first contact seat is provided with a first guide groove and a contact finger groove, a guide ring is arranged in the first guide groove, the first contact seat is in sliding fit with the inner wall of the second contact seat through the guide ring, a contact finger is arranged in the contact finger groove, and the first contact seat is in contact with the inner wall of the second contact seat through the contact finger;

The end face of the first end of the second contact seat is coated with a high-conductivity material, the first end of the second contact seat is fixedly connected with the second static arc contact, a contact groove and a second guide groove which are in contact with the outer wall of the second guide rod are formed in the inner wall of the second end of the second contact seat, and the second contact seat is in sliding fit with the second guide rod.

A high voltage switchgear comprising a contact system, which is a contact system for a high voltage switchgear as claimed in any of the foregoing claims.

According to the contact system for the high-voltage switch equipment, the first fixed contact system and the second fixed contact system are arranged, the concave-convex structure is arranged at the end parts of the second fixed contact system and the movable arc contact, so that the distance between the second fixed contact system and the end part of the movable arc contact is smaller than the distance between the movable arc contact and the fixed main contact finger arranged in the static side shielding assembly, the pre-breakdown arc is limited between the second fixed contact system and the end part of the movable arc contact, the fixed main contact finger cannot be ablated, the second elastic assembly is arranged on the second fixed contact system, reliable connection between the second fixed contact system and the movable arc contact after closing is guaranteed, meanwhile, the static side shielding assembly and the second fixed contact system are matched to form a narrow channel, the electric arc can be prevented from entering the fixed main contact finger ablation in the static side shielding assembly after drifting, the static side shielding assembly and the second fixed contact finger can be effectively attracted to the surface of the static side shielding assembly or the second fixed contact system through the arrangement of the static side shielding assembly, and the static main contact finger can be effectively protected, and thus the stability of current can be guaranteed.

When the switch-on is performed, the pre-breakdown arc can be effectively limited at the end parts of the second fixed contact system and the movable arc contact through the concave-convex structure arranged at the end parts of the second fixed contact system and the movable arc contact, and meanwhile, the burning loss of the arc drift to the static main contact finger is further blocked by utilizing a narrow passage between the static side shielding assembly and the second fixed contact system.

When the brake is opened, the first static contact system is quickly separated from the movable arc contact under the drive of the first elastic component, and after the brake is opened, the first static contact system can enter the accommodating cavity of the second static contact system, so that the second static contact system plays an insulating and shielding role on the ablated first static contact system, and the reliability of isolating a fracture electric field is fully ensured.

Compared with the prior art, the contact system for the high-voltage switch equipment has the advantages that the pre-breakdown arc is limited between the second fixed contact system and the end part of the movable arc contact through the concave-convex structure arranged between the second fixed contact system and the end part of the movable arc contact, so that the risk of ablating the fixed main contact finger is reduced, meanwhile, the fixed main contact finger can be effectively protected by arranging the fixed side shielding assembly and the second fixed contact system to effectively attract the arc to the surface of the fixed side shielding assembly or the surface of the second fixed contact system, the stability and the reliability of current through flow are ensured, the damage of the high-temperature arc to the contact system is avoided, and the probability of insulating faults of current carrying and fracture is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present application, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a contact system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a switch-off limit position of a contact system according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a closing process of the contact system according to an embodiment of the present invention;

Fig. 4 is a schematic structural view of a rigid position of a contact system according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a closing limit position of a contact system according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a just-separated position of a contact system according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of switching-off and arc extinguishing of a contact system according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a static contact system according to an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a first stationary contact system according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a moving arc contact and a first static arc contact according to an embodiment of the present invention.

Wherein 100 is a moving contact, 101 is a conductive member, 102 is a moving arc contact, 1021 is a first mating hole, 1022 is a first rounded portion, 1023 is a first straight line portion, 1024 is a first chamfer portion;

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 piece, 2013 is a supporting part, 2014 is a guide cover, 202 is a first static arc contact, 2021 is a first air flow channel, 2022 is a static arc contact piece, 2023 is a second rounded part, 2024 is a second straight line part, 2025 is a second chamfer part, 203 is a first contact seat, 2031 is an air flow hole, 2032 is a second air flow channel, 2033 is a first guide groove, 2034 is a contact finger groove;

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 piece, 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;

400 is a static shield assembly, 401 is a static main contact finger, 402 is a static shield, 403 is a shield, and 404 is a static conductor.

Detailed Description

The core of the invention is to provide a contact system for high-voltage switch equipment, so as to avoid damage of high-temperature electric arcs to the contact system and reduce the probability of insulation faults of current carrying and fracture.

Another core of the present invention is to provide a high voltage switchgear with the contact system described above.

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1, an embodiment of the present invention discloses a contact system for a high voltage switching device, including a moving contact 100, a stationary contact system, and a stationary side shield assembly 400. In the prior art, when the switching bus converts current, a high-temperature arc is generated between the moving contact and the fixed contact, which causes burning loss of the contact, the contact finger and the shielding, and causes current carrying and fracture insulation faults. In addition, the decomposition products of gas and the splashes of electric arcs pollute the solid insulating part, generate surface flashover discharge, cause larger potential safety hazard to equipment and personnel, meanwhile, when the high-capacity and environment-friendly switch bus is switched on, the arcing time is longer, the electric arc energy is larger, the serious ablation of the arc contact is caused, and the contact fingers have different degrees of burning loss after the arc contact is ablated, so that the problem of electric field of an isolation fracture is caused, the ablation resistance of the high current is improved through improving the material of the arc contact, the effect is limited, the arcing time cannot be effectively reduced, the electric arc energy cannot be effectively inhibited, the surface degradation after the arc contact is ablated for a plurality of times, the arcing time is further increased, and the ablation defect of the arc contact is aggravated. According to the contact system for the high-voltage switch equipment, disclosed by the invention, the pre-breakdown arc is limited between the second fixed contact system 300 and the end part of the moving arc contact 102 through the concave-convex structure arranged between the second fixed contact system 300 and the end part of the moving arc contact 102, so that the risk of ablating the fixed main contact finger 401 is reduced, meanwhile, the fixed main contact finger 401 is effectively protected by arranging the fixed side shielding assembly 400 and the second fixed contact system 300 to effectively attract the arc to the surface of the fixed side shielding assembly 400 or the surface of the second fixed contact system 300, the stability and the reliability of current through flow are ensured, the damage of the high-temperature arc to the contact system is avoided, and the probability of insulating faults of current carrying and fracture is reduced. In addition, the first static contact system 200 is quickly separated from the movable arc contact 102 under the drive of the first elastic component 201, and compresses the air cavity 304 between the first static contact system and the second contact seat 303, so that the dynamic and static double-acting speed increasing and air-blowing arc extinguishing capability is formed, the heat dissipation and cooling effects on a large-capacity arc column are effectively improved, the arcing time is effectively reduced, the arc energy is restrained from ablating the arc contact, and the medium strength is quickly recovered, so that the effective breaking is realized, the solid insulating piece is prevented from being polluted by the decomposition products of air and the splashes of electric arcs, the surface flashover discharge is generated, and the potential safety hazards to equipment and personnel are avoided.

As shown in fig. 1, the moving contact 100 includes a conductive member 101 and a moving arc contact 102 disposed on the conductive member 101, and when the moving contact 100 is at a breaking limit position, the moving contact 100 is disposed inside a moving shielding end surface, so as to ensure that effective insulation shielding can be obtained after electric wear, as shown in fig. 2. Meanwhile, the static contact system comprises a first static contact system 200 and a second static contact system 300, the first static contact system 200 is used for being in contact with the movable arc contact 102 when the movable arc contact 102 is separated from the second static contact system 300, the generation of pre-breakdown electric arcs is avoided, the first static contact system 200 is provided with a first elastic component 201 to ensure that the first static contact system 200 is quickly separated from the movable arc contact 102, the end parts of the second static contact system 300 and the movable arc contact 102 are provided with concave-convex matching structures, the pre-breakdown electric arcs are limited between the second static contact system 300 and the end parts of the movable arc contact 102, the second static contact system 300 is provided with a second elastic component 301 to ensure that the second static contact system 300 and the movable arc contact 102 are reliably connected after the switch is closed, the second static contact system 300 is provided with a containing cavity, the first static contact system 200 is positioned in the containing cavity of the second static contact system 300, the first static contact system 200 is in sliding fit with the inner walls of the second static contact system 300, after the switch is separated, the first static contact system 200 can enter the second static contact system 300 to be in the containing cavity, and the second static contact system 300 is completely isolated from the electric field, and the first static contact system is completely isolated from the second static contact system is completely isolated after the switch is separated.

Further, as shown in fig. 1, a stationary main contact finger 401 is disposed in the stationary shielding assembly 400, where the stationary main contact finger 401 is used for contacting with the conductive member 101 during closing, and plays a role of main heavy current through-flow, so as to ensure stability of the heavy current through-flow, and the stationary shielding assembly 400 cooperates with the second stationary contact system 300 to form a narrow channel. When the switch-on is performed, the concave-convex structure arranged at the end part of the second fixed contact system 300 and the movable arc contact 102 enables the distance between the second fixed contact system 300 and the end part of the movable arc contact 102 to be smaller than the distance between the movable arc contact 102 and the fixed main contact finger 401 arranged in the fixed side shielding assembly 400, the pre-breakdown arc can be effectively limited at the end part of the second fixed contact system 300 and the movable arc contact 102, meanwhile, the narrow channel between the fixed side shielding assembly 400 and the second fixed contact system 300 is utilized, the movement of the second fixed contact system 300 is not blocked, meanwhile, the arc drift is prevented from entering the fixed side shielding assembly 400, the fixed main contact finger 401 is ablated, the burning loss of the fixed main contact finger 401 is further protected, as shown in fig. 3 and 4, until the fixed main contact finger 401 contacts with the conductive piece 101 of the movable contact 100, and the switch-on process is completed, as shown in fig. 5. When the switch is opened, after the second fixed contact system 300 is separated from the moving arc contact 102, as the first fixed contact system 200 is still in contact with the moving arc contact 102, a pre-breakdown arc is not generated when the moving arc contact 102 is separated from the second fixed contact system 300, as shown in fig. 6, and the first fixed contact system 200 is quickly separated from the moving arc contact 102 under the drive of the first elastic component 201, after the switch is opened, the first fixed contact system 200 can enter the accommodating cavity of the second fixed contact system 300, as shown in fig. 2, so that the second fixed contact system 300 plays an insulating and shielding role on the ablated first fixed contact system 200, the reliability of an isolated fracture electric field is fully ensured, the static main contact finger 401 is effectively protected, the stability and reliability of a current flow are ensured, the damage of the high-temperature arc to the contact system is avoided, and the probability of insulating faults of current carrying and fracture is reduced. It should be noted that, the occurrence of the electric arc is determined according to the magnitude of the electric field between each other, the electric field is greater than the breakdown field strength of the air gap, and a breakdown arc is generated, according to e=u/D, where D is a distance, U is a voltage, and E is a field strength, where under a condition that the voltage is constant, the smaller the distance is, the greater the electric field strength is, so that the breakdown position is ensured in the concave-convex structure disposed at the end portions of the second stationary contact system 300 and the moving arc contact 102, so as to prevent the pre-breakdown arc from entering the stationary main contact finger 401 ablated by the stationary side shielding assembly 400.

According to the contact system for the high-voltage switch equipment disclosed by the invention, the first fixed contact system 200 and the second fixed contact system 300 are arranged, the concave-convex structure is arranged at the end part of the second fixed contact system 300 and the end part of the movable arc contact 102, so that the distance between the second fixed contact system 300 and the end part of the movable arc contact 102 is smaller than the distance between the movable arc contact 102 and the fixed main contact finger 401 arranged in the fixed side shielding assembly 400, the pre-breakdown arc is limited between the second fixed contact system 300 and the end part of the movable arc contact 102, the fixed main contact finger 401 is not ablated, the second elastic assembly 301 is arranged on the second fixed contact system 300, the reliable connection between the second fixed contact system 300 and the movable arc contact 102 after closing is ensured, meanwhile, the fixed side shielding assembly 400 and the second fixed contact system 300 are matched to form a narrow channel, the moving of the second fixed contact system 300 is not hindered, the moving of the second fixed contact system 300 is prevented from entering the fixed main contact finger 401 in the fixed side shielding assembly 400, the fixed side shielding assembly 400 is effectively prevented from being absorbed by the fixed side shielding assembly 300, the fixed contact finger 401 is effectively shielded by the fixed side shielding assembly 300, and the current is effectively absorbed by the fixed contact system 300, and the stable current is effectively absorbed by the fixed contact finger, and the stable current is ensured.

When the switch is closed, the pre-breakdown arc can be effectively limited to the end parts of the second fixed contact system 300 and the movable arc contact 102 through the concave-convex structure arranged at the end parts of the second fixed contact system 300 and the movable arc contact 102, and meanwhile, the burning loss of the arc drift to the fixed main contact finger 401 is further blocked by utilizing a narrow passage between the fixed side shielding assembly 400 and the second fixed contact system 300.

When the brake is released, the first static contact system 200 is driven by the first elastic component 201 to be quickly separated from the moving arc contact 102, and after the brake is released, 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 and shielding role on the ablated first static contact system 200, and the reliability of isolating a fracture electric field is fully ensured.

Compared with the prior art, the contact system for the high-voltage switch equipment disclosed by the invention has the advantages that the pre-breakdown arc is limited between the second fixed contact system 300 and the end part of the moving arc contact 102 through the concave-convex structure arranged between the second fixed contact system 300 and the end part of the moving arc contact 102, so that the risk of ablating the fixed main contact finger 401 is reduced, meanwhile, the fixed main contact finger 401 is effectively protected by arranging the fixed side shielding assembly 400 and the second fixed contact system 300 to effectively attract the arc to the surface of the fixed side shielding assembly 400 or the surface of the second fixed contact system 300, the stability and the reliability of current through-flow are ensured, the damage of the high-temperature arc to the contact system is avoided, and the probability of insulating faults of current carrying and fracture is reduced.

Further, as shown in fig. 6, 7 and 9, in a specific embodiment, the first static contact system 200 includes a first static arc contact 202 and a first contact base 203 connected to the first static arc contact 202, the first contact base 203 is connected to the first elastic component 201, and an air flow structure is disposed on the first static contact system 200, the air flow structure includes an air flow hole 2031 disposed on the first contact base 203 and a first air flow channel 2021 disposed on the first static arc contact 202 and communicating with the air flow hole 2031, when the brake is separated, an air cavity 304 is formed between the first contact base 203 and the second contact base 303, and the air flow hole 2031 on the first contact base 203 communicates with the air cavity 304, while a second air flow channel 2032 is disposed on the first contact base 203, and the first static arc contact 202 is fixedly connected to the first contact base 203, the first air flow channel 2021 and the second air flow channel 2032 of the first static arc contact 202 communicate with the air cavity 304 formed when the brake is separated, respectively. As shown in fig. 7, 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 meanwhile, the air cavity 304 formed between the first static arc contact 202 and the first contact seat 203 is compressed, so that the air flow formed by the compressed air cavity 304 is blown to the position where the first static arc contact 202 is separated from the moving arc contact 102 by the air flow holes 2031 on the first contact seat 203 through the second air flow channel 2032 and the first air flow channel 2021 respectively, the effect of air-blowing arc extinguishing is realized, and the blown air flow can push the moving arc contact 102 to be quickly separated, thereby forming the effect of moving and static accelerating separation, effectively improving the heat dissipation and cooling effect on a large-capacity arc column, reducing the arcing time, inhibiting the arc energy from ablating the arc contact, and realizing the quick recovery of medium strength and the effective opening of a contact system.

Further, as shown in fig. 8 and 9, the second stationary contact system 300 includes a second stationary arc contact 302 and a second contact base 303 connected to the second stationary arc contact 302, the second contact base 303 is connected to the second elastic component 301, the first contact base 203 is slidably matched with an inner wall of the second contact base 303, a first guiding groove 2033 and a contact finger groove 2034 are provided on an outer wall of the first contact base 203, a guiding ring is provided in the first guiding groove 2033, the first contact base 203 is slidably matched with an inner wall of the second contact base 303 through the guiding ring, so as to play a guiding role on the first contact base 203, a contact finger 203is provided in the contact finger groove 2034, and the first contact base 203 is contacted with the inner wall of the second contact base 303 through the contact finger, so as to ensure reliable contact current of an arc.

Further, as shown in fig. 1, the static shield assembly 400 includes a static shield 402 and a shield 403 disposed on the static shield 402, the shield 403 cooperates with the second static arc contact 302 to form a catwalk to prevent the arc from drifting into the shield 403 to ablate the static primary contact finger 401, and the static shield 402 is connected to the static conductor 404, while the static primary contact finger 401 is connected to the static shield 402. The protection casing 403 adopts the ablation resistant material, the surface of protection casing 403 is circular arc structure, and protection casing 403 and the parallel and level of second quiet arc contact 302, protection casing 403 is located the front end of quiet main contact finger 401, have first clearance between protection casing 403 and the quiet main contact finger 401 simultaneously, the internal diameter of protection casing 403 is greater than the internal diameter of quiet main contact finger 401, in order to guarantee that the external diameter of moving contact 100 does not contact protection casing 403 when the combined floodgate is inserted, direct contact is to quiet main contact finger 401, narrow and small passageway through protection casing 403 and the cooperation of second quiet arc contact 302 formation can prevent to get into the quiet main contact finger 401 of ablation after the electric arc drift, and quiet shielding 402, protection casing 403 and the parallel and level of second quiet arc contact 302 set up, the electric field distribution of fracture quiet side terminal surface position has been guaranteed more evenly. It should be noted that, the ablation-resistant material may be copper-tungsten 80 or above, and those skilled in the art will understand that, the ablation-resistant material will reduce the current flowing capability, so in order to ensure the high current flowing capability and the high current flowing stability, the stationary main contact finger 401 playing a main role in flowing current is generally not made of ablation-resistant material, in this embodiment, the protective cover 403 is disposed at the front end of the stationary main contact finger 401 and is flush with the second stationary arc contact 302, so that the pre-breakdown arc generated in the switching-on and switching-off process cannot contact the stationary main contact finger 401, avoiding the situation that the stationary main contact finger 401 is ablated, effectively protecting the stationary main contact finger 401, thereby avoiding the damage of the high temperature arc to the contact system, and reducing the probability of insulation fault of current carrying and fracture.

Further, as shown in fig. 1, in a specific embodiment, the moving arc contact 102 and the second static arc contact 302 both adopt ablation-resistant materials, the moving arc contact 102 adopts a convex structure, the second static arc contact 302 adopts a concave structure matched with the convex structure of the moving arc contact 102, meanwhile, a first matching hole 1021 matched with the first static arc contact 202 is arranged at the end part of the moving arc contact 102, a second matching hole 3021 matched with the first static arc contact 202 is arranged at the central position of the second static arc contact 302, the outer diameter of the second static arc contact 302 is smaller than the inner diameter of a Yu Jing main contact finger 401, so that when the moving contact 100 pushes the second static arc contact 302 during closing insertion, the second static arc contact 302 is not influenced by the main contact finger 401, and the closing centering of the moving contact 100 is easy by the concave-convex matching through 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.

As shown in fig. 9 and 10, an end portion of the first static arc contact 202 is provided with an ablation-resistant static arc contact piece 2022, an end portion of the static arc contact piece 2022 is of a finger flap type structure, a first air flow channel 2021 is formed in a center position of the finger flap type structure and is communicated with a second air flow channel 2032 arranged on the first contact base 203, and an inner diameter of the first matching hole 1021 is smaller than an outer diameter of the static arc contact piece 2022. Specifically, the stationary arcing contact piece 2022 and the first fitting hole 1021 of the moving arcing contact 102 are respectively provided with a rounded portion, a straight portion, and a chamfered portion that are fitted to each other. For ease of understanding, the rounded portion, the straight portion, and the chamfer portion provided on the first fitting hole 1021 of the moving arcing contact 102 are defined as a first rounded portion 1022, a first straight portion 1023, and a first chamfer portion 1024, respectively, and the rounded portion, the straight portion, and the chamfer portion provided on the stationary arcing contact piece 2022 are defined as a second rounded portion 2023, a second straight portion 2024, and a second chamfer portion 2025, respectively. As shown in fig. 4, when the movable arc contact 102 is in the initial closing state, namely, in the just closing position, the first rounded portion 1022 of the movable arc contact 102 is in contact with the second rounded portion 2023 of the static arc contact piece 2022, so that guiding pressure and friction are smaller, centering and plugging cooperation of the movable arc contact 102 and the first static arc contact 202 are facilitated, when the closing process is continued, the first straight portion 1023 of the movable arc contact 102 is in contact with the second straight portion 2024 of the static arc contact piece 2022, radial compression elastic deformation is generated, so that the contact area is increased, and reliable surface contact is ensured, and as shown in fig. 5, after closing, the first chamfered portion 1024 of the movable arc contact 102 is stably separated from the second chamfered portion 2025 of the static arc contact piece 2022, no electrical connection is generated, and at this time, the static main contact finger 401 is connected with the conductive piece 101 of the movable contact 100, so that reliable through flow of a main circuit is ensured. As shown in fig. 6, when the switch is opened, the first chamfer 1024 of the moving arc contact 102 presses the finger flap structure of the static arc contact piece 2022, the first static arc contact 202 is pulled to move synchronously with the moving contact 100 under the action of the contact force, so as to realize synchronous traction switch-off movement of the first static arc contact 202 and the first contact seat 203, meanwhile, air flows back to the air cavity 304 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 until 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 meanwhile, the air cavity 304 formed between the first static arc contact 202 and the second contact seat 303 is compressed, so that air flows formed by the compressed air cavity 304 are blown to the position where the first static arc contact 202 is separated from the moving arc contact 102 by the second air flow channel 2032 and the first air flow channel 2021 respectively, so as to realize the effect of air-blowing arc extinguishing, and the blown air flows can push the moving arc contact 102 to be quickly separated, so as to form the effect of quick-release lifting arc.

Further, as shown in fig. 8, in a specific embodiment, the first elastic component 201 includes a first guide rod 2011 and a first return elastic member 2012 sleeved on the first guide rod 2011, a first end of the first guide rod 2011 is provided with a supporting portion 2013 supporting the first return elastic member 2012, a second end of the first guide rod 2011 is sleeved with a guiding cover 2014, the first guide rod 2011 is slidably matched with the guiding cover 2014, a second end of the first guide rod 2011 is in threaded connection with the first contact holder 203, so that the moving contact 100 can drive the first guide rod 2011 to slide while driving the first contact holder 203 to move, and the first return elastic member 2012 is located between the guiding cover 2014 and the supporting portion 2013 of the first guide rod 2011. The second elastic component 301 is located the inner chamber of quiet shielding 402, have the second clearance between the inner chamber of quiet shielding 402 and the second contact seat 303, play radial spacing's effect to the motion of second contact seat 303 through the inner chamber of quiet shielding 402, and second elastic component 301 includes second guide arm 3011 and the second elastic component 3012 that resets of cover on second guide arm 3011, the first end of second guide arm 3011 is provided with first support ring 3013, the second end of second guide arm 3011 is provided with second support ring 3014, and second elastic component 3012 that resets is located between first support ring 3013 and the second support ring 3014, first support ring 3013 and second contact seat 303 threaded connection, second support ring 3014 and second guide arm 3011 threaded connection. Wherein, 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 in threaded connection with the guide cover 2014, meanwhile, 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 high conductive material, and the second end of the second guide rod 3011 is in fastening connection with the static side conductor 404.

Specifically, the first return elastic member 2012 employs a first spring, the second return elastic member 3012 employs a second spring, a central through hole is provided in the middle of the guide cover 2014, the first guide rod 2011 is in sliding fit with the central through hole of the guide cover 2014, and a first end of the second guide rod 3011 is in threaded connection with the guide cover 2014 to form a closed mounting groove 3015 for accommodating the first guide rod 2011. When the brake is released, the first chamfer 1024 of the movable arc contact 102 extrudes the static arc contact piece 2022, and pulls the first static arc contact 202 and the movable contact 100 to move synchronously under the action of contact force, so that synchronous traction brake release movement of the first static arc contact 202 and the first contact base 203 is realized, the outer wall of the guide cover 2014 has a radial limiting function when the brake is released to the second contact base 303, axial movement of the second static contact system 300 is ensured, and the distance between the second static arc contact 302 and the end face of the protective cover 403 can be ensured to keep the original set position when the brake is released under the thrust action of the second reset elastic piece 3012, as shown in fig. 2. Meanwhile, the inner side end surface of the guide cover 2014 plays a role of axial limiting in the brake separating process of the first guide rod 2011 following contact 100, so that the first static arc contact 202 is ensured to meet the requirement of the just separated position, as shown in fig. 6.

As shown in fig. 3, when the contact system is in the closing motion, the moving contact 100 extends out of the moving shield, approaches to the second static arc contact 302, and a pre-breakdown arc occurs, and because the distance between the moving arc contact 102 and the second static arc contact 302 of the moving contact 100 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, and meanwhile, a narrow channel is formed between the protective cover 403 and the second static arc contact 302, so that the burning loss of the arc drift to the static main contact finger 401 is further blocked while the motion of the second static arc contact 302 is not influenced. The moving contact 100 continues to move towards 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, namely, when the contact system is at the just-closed position, as shown in fig. 4, the closing centering of the moving contact 100 is facilitated by the cooperation of the convex end surface of the moving arc contact 102 and the concave end surface of the second static arc contact 302. At this time, the moving contact 100 continues to move rightward (from the view of fig. 4), the first rounded portion 1022 of the first mating hole 1021 of the moving arcing contact 102 contacts the second rounded portion 2023 of the static arcing contact piece 2022, so that the guiding pressure and friction are smaller, and the centering and plugging of the moving arcing contact 102 and the first static arcing contact 202 are completed; when continuing to move rightwards, the first straight line part 1023 of the first matching hole 1021 of the moving arc contact 102 is contacted with the second straight line part 2024 of the static arc contact piece 2022 and generates radial compression elastic deformation so as to increase the contact area and ensure reliable surface contact, as shown in fig. 5, after closing, the first chamfer part 1024 of the first matching hole 1021 of the moving arc contact 102 is stably separated from the second chamfer part 2025 of the static arc contact piece 2022, meanwhile, the moving arc contact 102 drives the second static arc contact 302 and the second contact seat 303 to move rightwards (view angle of fig. 4), and compresses the second reset elastic piece 3012 to store energy, so that before the static main contact finger 401 is contacted with the conductive piece 101 of the moving contact 100, reliable contact between the moving arc contact 102 and the second static arc contact 302 in the closing process can be ensured, and reliable current transfer from the second static arc contact 302 to the conductive piece 101 is realized until the static main contact finger 401 is connected with the conductive piece 101 of the moving contact 100, and reliable through flow of a main circuit is ensured, namely, the closing action position of the system is in the limit position shown in fig. 5. It should be noted that, during the process from the contact system to the closing limit position, the first reset elastic member 2012 is always in the pre-compressed state, so as to ensure that the first static arc contact 202 and the first contact base 203 remain in the fixed positions during the above process.

As shown in fig. 6, when the contact system is switched off, the moving contact 100 moves leftwards (from the view of fig. 6) from the switching-on limit position to the just-switched-off position, the stationary main contact finger 401 is first separated from the conductive member 101 of the moving contact 100, and in this process, the second reset elastic member 3012 continuously releases switching-on stored energy and pushes the second stationary arc contact 302 to reliably contact with the moving arc contact 102 in the switching-off process, so as to realize reliable current transfer from the conductive member 101 to the second stationary arc contact 302. Meanwhile, the moving arc contact 102 presses the finger flap type structure of the static arc contact piece 2022 of the first static arc contact 202 by using the first chamfer 1024 of the first mating hole 1021, synchronous traction and opening movement of the first static arc contact 202 and the first contact seat 203 is realized under the action of contact force, air flows return to the air cavity 304 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, and at this time, the first reset elastic piece 2012 is converted from the pre-compression state to the compression state. When the moving contact 100 continues to move leftwards (from view angle of fig. 6), that is, in the process from the just-separated position to the opening limit position, the first static arc contact 202 moves leftwards (from view angle of fig. 6) to continuously compress the first reset elastic member 2012, meanwhile, the contact finger flap structure of the static arc contact member 2022 and the first matching hole 1021 of the moving arc contact 102 generate radial compression elastic deformation, until the energy storage pulling force of the first reset elastic member 2012 is greater than the critical point of the radial compression elastic deformation and friction force generated by the contact finger flap structure and the first matching hole 1021 of the moving arc contact 102, the first static arc contact 202 and the first contact seat 203 are quickly separated from the moving arc contact 102 under the driving of the first reset elastic member 2012, at this time, the first reset elastic member returns to the precompacted state, meanwhile, the first contact seat 203 compresses the air cavity 304 between the first contact seat 203 and the second contact seat 303, and forms blowing air flow between the first static arc contact 202 and the moving arc contact 102, the static arc contact 202 generated when the first static arc contact 102 is separated from the moving arc contact 102, and simultaneously, the moving arc contact 102 can be quickly pushed to be separated from the moving arc contact 102, and the burning effect of the moving arc is suppressed, as shown by the figure, and the burning effect of the moving arc is reduced, and the burning effect of the moving arc is shown by the moving arc is 7.

Further, as shown in fig. 8, the end face of the first end of the second contact holder 303 is coated with a high conductive material, the first end of the second contact holder 303 is fixedly connected with the second static arc contact 302, a contact slot 3031 and a second guide slot 3032 are arranged on the inner wall of the second end of the second contact holder 303 and are in contact with the outer wall of the second guide rod 3011, the second contact holder 303 and the second guide rod 3011 are in sliding fit through a contact finger arranged in the contact slot 3031 and a guide ring in the second guide slot 3032, the second guide slot 3032 plays a guiding role, and the contact slot 3031 ensures reliable current passing. As shown in fig. 4 and 5, when the moving contact 100 moves rightward (view angle of fig. 4), the second static arc contact 302 and the second contact seat 303 are pushed to move rightward (view angle of fig. 4), the second contact seat 303 slides smoothly under the combined 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, and meanwhile, the contact groove 3031 provided on the second contact seat 303 and the contact groove 2034 provided on the first contact seat 203 ensure that the second contact seat 303 contacts the through-flow reliably in sliding.

The embodiment of the invention also discloses a high-voltage switch device, which comprises a contact system, wherein the contact system is the contact system for the high-voltage switch device disclosed in the embodiment, so that all the technical effects of the contact system for the high-voltage switch device are achieved, and the description is omitted herein.

The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A contact system for a high voltage switchgear, comprising:

A moving contact (100), wherein the moving contact (100) comprises a conductive piece (101) and a moving arc contact (102) arranged on the conductive piece (101);

The static contact system comprises a first static contact system (200) and a second static contact system (300), wherein the first static contact system (200) is used for being in contact with the moving arc contact (102) when the switch is opened, the first static contact system (200) is provided with a first elastic component (201), the second static contact system (300) and the end part of the moving arc contact (102) are provided with concave-convex matching structures, the second static contact system (300) is provided with a second elastic component (301), the second static contact system (300) is provided with a containing cavity, the first static contact system (200) is positioned in the containing cavity of the second static contact system (300), and the first static contact system (200) is in sliding fit with the inner wall of the second static contact system (300);

The static side shielding assembly (400), be provided with quiet main contact finger (401) in static side shielding assembly (400), quiet main contact finger (401) are used for with conducting piece (101) contact when closing a floodgate, static side shielding assembly (400) with second static contact system (300) cooperation forms narrow and small passageway.

2. The contact system for a high voltage switchgear according to claim 1, characterized in that the first stationary contact system (200) comprises a first stationary arcing contact (202) and a first contact base (203) connected to the first stationary arcing contact (202), the first contact base (203) being connected to the first elastic assembly (201);

The second static contact system (300) comprises a second static arc contact (302) and a second contact seat (303) connected with the second static arc contact (302), the second contact seat (303) is connected with the second elastic component (301), and the first contact seat (203) is in sliding fit with the inner wall of the second contact seat (303);

The static side shielding assembly (400) comprises a static shielding (402) and a protective cover (403) arranged on the static shielding (402), the protective cover (403) is matched with the second static arc contact (302) to form a narrow passage, and the static shielding (402) is connected with a static side conductor (404).

3. The contact system for a high-voltage switching device according to claim 2, characterized in that an air flow structure is provided on the first stationary contact system (200), the air flow structure comprising an air flow hole (2031) provided on the first contact base (203) and a first air flow channel (2021) provided on the first stationary arc contact (202) and communicating with the air flow hole (2031), the air flow hole (2031) on the first contact base (203) being for communicating with an air cavity (304) formed between the first contact base (203) and the second contact base (303) when opening;

The first contact seat (203) is provided with a second air flow channel (2032), the first static arc contact (202) is fixedly connected with 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 communicated with the air cavity (304).

4. A contact system for a high voltage switchgear according to claim 3, characterized in that the moving arcing contact (102) is of ablation-resistant material, the moving arcing contact (102) is of convex structure, and the end of the moving arcing contact (102) is provided with a first mating hole (1021) mating with the first static arcing contact (202), the end of the first static arcing contact (202) is provided with an ablation-resistant static arcing contact piece (2022), the end of the static arcing contact piece (2022) is of a contact finger flap type structure, and the inner diameter of the first mating hole (1021) is smaller than the outer diameter of the static arcing contact piece (2022);

The second static arc contact (302) is made of ablation-resistant materials, the second static arc contact (302) is of a concave structure matched with the convex structure of the moving arc contact (102), a second matching hole (3021) matched with the first static arc contact (202) is formed in 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 a high voltage switchgear according to claim 4, characterized in that the shield (403) is of ablation resistant material, the outer surface of the shield (403) is of circular arc structure, and the shield (403) is flush with the second static arc contact (302), the shield (403) is located at the front end of the static main contact finger (401), a first gap is provided between the shield (403) and the static main contact finger (401), and the inner diameter of the shield (403) is larger than the inner diameter of the static main contact finger (401).

6. The contact system for a high-voltage switching device according to claim 4, wherein the stationary arcing contact piece (2022) and the first fitting hole (1021) of the moving arcing contact (102) are respectively provided with a rounded portion, a straight portion and a chamfer portion which are fitted to each other, the first stationary arcing contact (202) and the moving arcing contact (102) are contacted by the rounded portion in a closing initial state so as to be centered and plug-in fitted, the first stationary arcing contact (202) and the moving arcing contact (102) are contacted by the straight portion in a closing process so as to increase a contact area, and the moving arcing contact (102) and the first stationary arcing contact (202) are synchronously moved by the chamfer portion in a separating state.

7. The contact system for a high voltage switchgear according to claim 2, characterized in that the first elastic assembly (201) comprises a first guide rod (2011) and a first return elastic member (2012) sleeved on the first guide rod (2011), a first end of the first guide rod (2011) is provided with a support part (2013) for supporting the first return elastic member (2012), a second end of the first guide rod (2011) is sleeved with a guide cover (2014) at the outer side, and the first guide rod (2011) is in sliding fit with the guide cover (2014), the second end of the first guide rod (2011) is in threaded connection with the first contact base (203), and the first return elastic member (2012) is located between the guide cover (2014) and the support part (2013) of the first guide rod (2011).

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

9. The contact system for a high-voltage switching device according to claim 8, wherein a first end of the second guide rod (3011) is provided with a mounting groove (3015) for accommodating the first guide rod (2011), 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 in threaded connection with the guide cover (2014), a 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 high-conductivity material, and the second end of the second guide rod (3011) is in fastening connection with the stationary side conductor (404).

10. The contact system for a high-voltage switching device according to claim 8, characterized in that the outer wall of the first contact base (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 base (203) is in sliding fit with the inner wall of the second contact base (303) through the guide ring, a contact finger is provided in the contact finger groove (2034), and the first contact base (203) is in contact with the inner wall of the second contact base (303) through the contact finger;

The end face of the first end of the second contact seat (303) is coated with a high-conductivity material, the first end of the second contact seat (303) is fixedly connected with the second static arc contact (302), a contact groove (3031) and a second guide groove (3032) which are in contact with the outer wall of the second guide rod (3011) are formed in the inner wall of the second end of the second contact seat (303), and the second contact seat (303) is in sliding fit 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 of claims 1-10.