A fast grounding switch device

Abstract

A fast grounding switch device includes a housing, a moving contact structure and a stationary contact structure. The moving contact structure is arranged in the housing, and a through hole is provided on one side wall of the housing; the stationary contact structure is arranged outside the housing adjacent to the through hole, and the stationary contact structure includes an arc guide cover and a stationary contact. The arc guide cover surrounds and covers the stationary contact, and an opening is provided on the side close to the through hole; when closing, the moving contact of the moving contact structure extends out of the housing through the through hole and extends into the arc guide cover through the opening to cooperate with the stationary contact. When opening, the moving contact of the moving contact structure is retracted into the housing, and the arc guide cover suppresses the arc generated by the moving contact and the stationary contact during opening and closing within the arc guide cover. A fast grounding switch device of the present invention suppresses the arc within the arc guide cover by arranging an arc guide cover on the stationary contact, thereby meeting the requirements of opening and closing super class B and reducing the risk of arc breakdown during opening and closing.

Description

Technical Field

[0001] The invention relates to the field of high-voltage transmission lines, and in particular to a fast grounding switch device. Background Art

[0002] With the rapid development of power construction, the power grid is constantly expanding and the capacity is also increasing. In order to reduce the land occupation of the transmission corridor, more and more transmission lines adopt the same tower double circuit mode. The combined electrical appliances used in this transmission line need to have the ability to open and close the induced current. With the popularization of the same tower double circuit and the increase in voltage level, the ability of the combined electrical appliance's fast grounding switch to open and close the induced current is also increasingly required. In the 220kV same tower double circuit line, the induced voltage generally reaches tens of kilovolts, and the induced current is also very large under certain conditions. As a result, the induced voltage and induced current are far higher than the Class B recommended values ​​stipulated by the state, making the existing 220kV combined electrical appliance Class B fast grounding switch unable to meet the requirements. In addition, the arc generated when the moving contact and the static contact are opened and closed has a high risk of arc breakdown due to the lack of equipment to suppress the arc within a certain range. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a fast grounding switch device with simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A fast grounding switch device comprises a shell, a moving contact structure and a stationary contact structure, wherein the moving contact structure is arranged in the shell, and a through hole is provided on a side wall of the shell; the stationary contact structure is arranged outside the shell adjacent to the through hole, and the stationary contact structure comprises an arc guide cover and a stationary contact, wherein the arc guide cover surrounds and covers the stationary contact, and an opening is provided on the side of the arc guide cover close to the through hole; when closing the switch, the moving contact of the moving contact structure extends out of the shell through the through hole and extends into the arc guide cover through the opening to cooperate with the stationary contact, and when opening the switch, the moving contact of the moving contact structure is retracted into the shell, and the arc guide cover suppresses the arc generated by the moving contact and the stationary contact during opening and closing within the arc guide cover.

[0006] Furthermore, the arc guide hood is in the shape of a hollow cylinder with both ends open. The arc guide hood is arranged on the side of the static contact close to the through hole. The end of the arc guide hood close to the static contact is connected to the static contact as a connecting end, and the end of the arc guide hood close to the through hole is an opening for the moving contact to extend into.

[0007] Furthermore, the side wall of the arc guide cover close to the through hole shrinks inwardly to form an opening, and the inner diameter of the opening is smaller than the inner diameter of the connecting end.

[0008] Furthermore, the edge of the opening extends toward the through hole to form a convex edge, the inner diameter of the convex edge is larger than the inner diameter of the opening and an arc-shaped transition is formed between the convex edge and the opening. The arc guide cover with the convex edge has an overall structure that is thick at both ends and thin in the middle.

[0009] Furthermore, the static contact includes a conductive contact finger, a shielding cover is arranged around the outer periphery of the conductive contact finger, the shielding cover is provided with a guide hole for the moving contact to contact the conductive contact finger, the arc guide cover is arranged on the shielding cover, the moving contact passes through the opening of the arc guide cover and the guide hole of the shielding cover to contact or separate from the conductive contact finger to complete the closing or opening of the moving contact and the static contact.

[0010] Furthermore, it also includes a shell, which encloses the outer shell, the moving contact structure and the static contact structure. SF6 gas is filled in the shell. When the moving contact and the static contact are opened and closed to generate an arc, the heat instantly generated in the arc guide cover causes the SF6 gas to expand due to the heat and extinguish the arc.

[0011] Furthermore, a sliding rod and a crank arm are provided in the shell, the moving contact structure is installed on the sliding rod, and the crank arm is rotatably installed in the shell. The moving contact structure performs linear reciprocating motion along the sliding rod under the drive of the crank arm to achieve closing and opening with the static contact.

[0012] Furthermore, the moving contact structure comprises a guide seat and a moving contact, the guide seat is provided with a through hole for the sliding rod to pass through, the moving contact is installed on one side of the guide seat close to the through hole, one end of the crank arm is rotatably installed in the housing, and the other end of the crank arm is connected to the guide seat;

[0013] When closing the circuit breaker, the crank arm rotates forward and moves the guide seat to drive the moving contact to move closer to the static contact;

[0014] When opening the circuit breaker, the crank arm rotates in the opposite direction and moves the guide seat to drive the moving contact away from the static contact.

[0015] Furthermore, one end of the crank arm is rotatably supported, and the other end of the crank arm is connected to the guide seat through a bolt-type needle roller. The crank arm makes a reciprocating motion along the sliding rod during the rotation process.

[0016] Furthermore, an insulator and a connector are provided in the shell. The insulator is provided through a side wall of the shell, and the central conductor of the insulator is connected to the moving contact structure through the connector.

[0017] Furthermore, the connecting piece includes a first connecting piece and a second connecting piece, the first connecting piece is made of a conductive material in an L shape, the second connecting piece is made of a flexible material, one end of the first connecting piece is connected to the moving contact structure, the other end of the first connecting piece is connected to one end of the second connecting piece, the other end of the second connecting piece is connected to the insulator, and the second connecting piece is made of a soft copper strip stacked by multiple copper sheets.

[0018] Furthermore, the shell is composed of a box body with an opening and a cover body, the cover body is sealed to the opening of the box body by bolts, and a through hole is provided in the middle of the cover body.

[0019] Compared with the prior art, a fast grounding switch device of the present invention suppresses the arc within the arc guide cover by arranging an arc guide cover on the static contact, and can be used for 220kV combined electrical appliances. It not only meets the requirements of opening and closing super Class B, but also meets the requirements of insulation and closing short-circuit current, and effectively reduces the risk of arc breakdown during opening and closing.

[0020] In addition, the arc guide cover is integrated with the static contact. The heat generated instantly in the arc guide cover can cause the SF6 gas to expand and blow out, accelerating the extinguishing of the arc. The moving contact is operated by the crank arm to make a linear reciprocating motion along the sliding rod. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a fast grounding switch device of the present invention (opening state);

[0022] Figure 2 It is a structural schematic diagram of a fast grounding switch device of the present invention (closed state);

[0023] Figure 3 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0024] The following is combined with Figures 1 to 3 The given embodiments further illustrate the specific implementation of a fast grounding switch device of the present invention. The fast grounding switch device of the present invention is not limited to the description of the following embodiments.

[0025] A fast grounding switch device comprises a shell, a moving contact structure and a static contact structure, wherein the moving contact structure is arranged in the shell, and a through hole 13 is provided on a side wall of the shell; the static contact structure is arranged outside the shell adjacent to the through hole 13, and the static contact structure comprises an arc guide cover 4 and a static contact 5, wherein the arc guide cover 4 surrounds and covers the static contact 5, and an opening 41 is provided on the side of the arc guide cover 4 close to the through hole 13; when closing the switch, the moving contact 2 of the moving contact structure extends out of the shell through the through hole 13 and extends into the arc guide cover 4 through the opening 41 to cooperate with the static contact 5, and when opening the switch, the moving contact 2 of the moving contact structure is retracted into the shell, and the arc guide cover 4 suppresses the arc generated by the moving contact 2 and the static contact 5 during opening and closing of the switch within the arc guide cover 4.

[0026] Compared with the prior art, a fast grounding switch device of the present invention suppresses the arc within the arc guide hood 4 by arranging an arc guide hood 4 on the static contact 5. It can be used for 220kV combined electrical appliances, which not only meets the requirements of opening and closing super Class B, but also meets the requirements of insulation and closing short-circuit current, and effectively reduces the risk of arc breakdown during opening and closing.

[0027] like Figure 1-3 As shown, a fast earthing switch device, a super-class B fast earthing switch device for 220kV combined electrical appliances, includes a shell, an outer shell, a moving contact structure and a static contact structure. The shell encloses the outer shell, the moving contact structure and the static contact structure, and SF6 gas is filled inside the shell. The moving contact structure is arranged in the outer shell, and a through hole 13 is provided on a side wall of the outer shell. The outer shell is preferably composed of a box body 11 with an opening and a cover body 12. The cover body 12 is bolted to the opening of the box body 11, and a through hole 13 is provided in the center of the cover body 12. The static contact structure is arranged outside the shell on the side adjacent to the through hole 13, and the static contact structure includes an arc guide cover 4 and a static contact 5. The arc guide cover 4 surrounds and covers the static contact 5, and the arc guide cover 4 is provided with an opening 41 on the side adjacent to the through hole 13; when closing the circuit, the moving contact 2 of the moving contact structure extends out of the shell through the through hole 13 and extends into the arc guide cover 4 through the opening 41 to cooperate with the static contact 5. When opening the circuit, the moving contact 2 of the moving contact structure is retracted into the shell, and the arc guide cover 4 suppresses the arc generated by the moving contact 2 and the static contact 5 during opening and closing of the circuit within the arc guide cover 4.

[0028] like Figure 1-2 As shown, the arc guide hood 4 is in the shape of a hollow cylinder with two ends open. The arc guide hood 4 is arranged on the side of the static contact 5 close to the through hole 13. The end of the arc guide hood 4 close to the static contact 5 is connected to the static contact 5 as a connecting end, and the end of the arc guide hood 4 close to the through hole 13 is used as an opening 41 for the moving contact 2 to extend into. Preferably, the side wall of the arc guide hood 4 close to the through hole 13 is contracted inward to form the opening 41 for the moving contact 2 to extend into. The inner diameter of the opening 41 is smaller than the inner diameter of the connecting end, which is beneficial to suppress the arc generated by the moving contact 2 and the static contact 5 when opening and closing the circuit breaker within the arc guide hood 4 to prevent the arc from overflowing. Preferably, the arc guide hood 4 is made of polytetrafluoroethylene with good insulation performance. Under the high temperature of the electric arc, the SF6 gas in the shell is heated and pressurized to extinguish the arc. As the super Class B voltage increases, the electromagnetic field density becomes larger and the insulation distance to the shell becomes larger. Since the arc guide hood 4 has good insulation performance, it is beneficial to suppress the arc within the range of the arc guide hood 4, effectively avoiding the risk of discharge breakdown of the shell due to the high super Class B voltage.

[0029] As a further structural optimization, the edge of the opening 41 extends toward the through hole 13 to form a convex edge 42, the inner diameter of the convex edge 42 is larger than the inner diameter of the opening 41 and an arc-shaped transition is formed between the convex edge 42 and the opening 41. The arc guide hood 4 with the convex edge 42 has a structure that is thick at both ends and thin in the middle as a whole, which is conducive to increasing the internal space of the arc guide hood 4, especially after SF6 gas is filled in the shell, when the moving contact 2 and the static contact 5 are opened and closed to generate an arc, the heat instantly generated in the arc guide hood 4 causes the SF6 gas to expand due to the heat and extinguish the arc. This structure can provide more space for blowing out the arc.

[0030] Specifically, Figure 1-2 As shown, the static contact 5 includes a conductive contact finger, a shielding cover 51 is arranged around the outer periphery of the conductive contact finger, the shielding cover 51 is provided with a guide hole for the moving contact 2 to contact with the conductive contact finger, the guide hole and the conductive contact finger are connected, the arc guide cover 4 is arranged on the shielding cover 51, and preferably, the inner diameter of the arc guide cover 4 close to the shielding cover 51 is larger than the outer diameter of the guide hole of the shielding cover 51, the moving contact 2 passes through the opening 41 of the arc guide cover 4 and the guide hole of the shielding cover 51 to contact or separate from the conductive contact finger to complete the closing or opening of the moving contact 2 and the static contact 5. The shielding cover 51 is mainly made of copper-tungsten alloy. Under the high temperature of the electric arc, the copper on the shielding cover 51 takes away a large amount of heat through the "sweating" effect, utilizing the characteristic that the melting and boiling points of copper are much lower than those of tungsten, so that the tungsten skeleton is cooled and maintains good mechanical properties, thereby ensuring the breaking function between the contacts; at the same time, the arc guide cover 4 is made of polytetrafluoroethylene with good insulation performance. Under the high temperature of the electric arc, the SF6 gas in the shell is heated and pressurized to extinguish the arc. As the super-B class voltage increases, the electromagnetic field density becomes larger, and the insulation distance to the shell becomes larger. Since the arc guide cover 4 has good insulation performance, it is beneficial to suppress the arc within the range of the arc guide cover 4. With the cooperation of the shielding cover 51 and the arc guide cover 4, the arc suppression effect is enhanced, further ensuring that the shell is not broken down by discharge, and effectively avoiding the risk of discharge breakdown of the shell due to the high super-B class voltage.

[0031] A sliding rod 7 and a crank arm 6 are also provided in the housing. Figure 1-2 As shown, two parallel sliding rods 7 are installed in the housing, and the sliding rods 7 are symmetrically arranged on both sides of the through hole 13. The moving contact structure is installed on the sliding rods 7, and the crank arm 6 is rotatably installed in the housing. One end of the crank arm 6 is connected to the moving contact structure. Under the action of external force, the crank arm 6 swings in a circle around a point in the housing. The moving contact structure moves back and forth along the sliding rod 7 under the drive of the crank arm 6 to achieve closing and opening with the static contact 5. Of course, the number of sliding rods 7 can be more than two or a single sliding rod 7.

[0032] Specifically, the moving contact structure includes a guide seat 3 and a moving contact 2. The guide seat 3 is provided with a through hole for the sliding rod 7 to pass through, and the through hole is slidably matched with the sliding rod 7. The moving contact 2 is installed on the side of the guide seat 3 close to the through hole 13. One end of the crank arm 6 is preferably rotatably supported in the outer shell, and the other end of the crank arm 6 is rotatably connected to the guide seat 3. Preferably, a bolt-type needle roller 61 is installed at the end of the crank arm 6 connected to the guide seat 3. Under the action of external force, the crank arm 6 rotates around the end rotatably supported in the outer shell, and the guide seat 3 reciprocates along the sliding rod 7 under the action of the bolt-type needle roller 61.

[0033] Preferably, the bolt-type needle roller 61 is a full-filled roller structure, and the bolt shaft raceway is quenched to avoid stress concentration. The outer surface of the thick-walled outer ring of the roller is arc-shaped, and there are two integral flanges on the outer ring, which are guided axially by rollers. The bolt shaft head and the press-fitted side retaining ring provide axial support for the outer ring through rollers, which is particularly suitable for heavier radial loads. Since the outer ring is axially guided by rollers, the bearing can also withstand heavier axial loads and allow relatively high-speed operation. The present invention utilizes the structure of a bolt-type needle roller with one side being a bolt, which can be fastened to the crank arm 6, which can effectively avoid the situation where the transmission part of other structures has been moved, but the sliding rod has not moved. When the crank arm 6 moves, the movement mode is a circular arc mode. If there is no axial movement of the outer ring of the bolt-type needle roller, the moving contact 2 is not well centered and the operating force is relatively large.

[0034] When closing the circuit breaker, Figure 1 As shown, the crank arm 6 rotates forward and moves the guide seat 3 to drive the moving contact 2 to move toward the direction close to the static contact 5. Figure 1 In the figure, the crank arm 6 rotates in the clockwise direction; when the switch is opened, the crank arm 6 rotates in the opposite direction and moves the guide seat 3 to drive the moving contact 2 to move away from the static contact 5. Figure 2 In the middle, the crank arm 6 rotates in the counterclockwise direction.

[0035] like Figure 1-2 As shown, an insulator 8 and a connector are also provided in the housing, wherein the insulator 8 is arranged through a side wall of the housing, and the central conductor of the insulator 8 is connected to the moving contact structure through the connector; the connector preferably includes a first connector 91 and a second connector 92, wherein the first connector 91 and the second connector 92 are connected to conduct electricity, one end of the first connector 91 is connected to the moving contact structure, the other end of the first connector 91 is connected to one end of the second connector 92, and the other end of the second connector 92 is connected to the insulator 8, preferably the first connector 91 is made of a conductive material in an L shape, and the second connector 92 is made of a flexible material, and the second connector 92 made of a flexible material has little interference with the reciprocating motion of the moving contact structure, and preferably the second connector 92 is made of a plurality of copper sheets with a thickness of 0.1 mm stacked to form a soft copper strip, which is conducive to repeated reciprocating motions.

[0036] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A fast grounding switch device, comprising a housing, a moving contact structure and a stationary contact structure, characterized in that: The moving contact structure is arranged in the housing, and a through hole (13) is provided on a side wall of the housing; the stationary contact structure is arranged outside the housing adjacent to a side of the through hole (13), and the stationary contact structure comprises an arc guide cover (4) and a stationary contact (5). The stationary contact (5) comprises a conductive contact finger, a shielding cover (51) is arranged around the outer periphery of the conductive contact finger, the shielding cover (51) is provided with a guide hole for the movable contact (2) to contact the conductive contact finger, and the arc guide cover (4) is arranged on the shielding cover (51). The arc guide cover (4) surrounds and covers the stationary contact (5), and the arc guide cover (4) is provided with an opening (41) on a side close to the through hole (13); the moving contact (2) passes through the opening (41) of the arc guide cover (4) and the guide hole of the shielding cover (51) to contact or separate with the conductive contact finger to complete the closing or opening of the moving contact (2) and the stationary contact (5), and the inner diameter of the arc guide cover (4) close to the shielding cover (51) is larger than the outer diameter of the guide hole of the shielding cover (51); When the switch is closed, the moving contact (2) of the moving contact structure extends out of the housing through the through hole (13) and extends through the opening (41) into the arc guide cover (4) to cooperate with the stationary contact (5); when the switch is opened, the moving contact (2) of the moving contact structure is retracted into the housing, and the arc guide cover (4) suppresses the arc generated by the moving contact (2) and the stationary contact (5) during the opening and closing of the switch within the arc guide cover (4); The arc guide cover (4) is arranged on a side of the stationary contact (5) close to the through hole (13); one end of the arc guide cover (4) close to the stationary contact (5) serves as a connecting end connected to the stationary contact (5); one end of the arc guide cover (4) close to the through hole (13) serves as an opening (41) for the moving contact (2) to extend into; the side wall of the arc guide cover (4) close to the through hole (13) contracts inwardly to form the opening (41); the inner diameter of the opening (41) is smaller than the inner diameter of the connecting end.

2. A fast grounding switch device according to claim 1, characterized in that: The arc guide cover (4) is in the shape of a hollow cylinder with both ends open.

3. A fast grounding switch device according to claim 1 or 2, characterized in that: The edge of the opening (41) extends in the direction of the through hole (13) to form a convex edge (42); the inner diameter of the convex edge (42) is greater than the inner diameter of the opening (41) and an arc-shaped transition is formed between the convex edge (42) and the opening (41); the arc guide cover (4) provided with the convex edge (42) has an overall structure with thick ends and thin middle.

4. A fast grounding switch device according to claim 1, characterized in that The shielding cover (51) is made of copper-tungsten alloy, and the arc guide cover (4) is made of polytetrafluoroethylene.

5. A fast grounding switch device according to claim 1, characterized in that: It also comprises a shell, which encloses the outer shell, the moving contact structure and the stationary contact structure. SF6 gas is filled in the shell, and when the moving contact (2) and the stationary contact (5) are opened or closed to generate an arc, the heat instantly generated in the arc guide cover (4) causes the SF6 gas to expand due to the heat, extinguishing the arc.

6. A fast grounding switch device according to claim 1, characterized in that: A sliding rod (7) and a crank arm (6) are provided in the housing, the moving contact structure is mounted on the sliding rod (7), the crank arm (6) is rotatably mounted in the housing, and the moving contact structure performs linear reciprocating motion along the sliding rod (7) under the drive of the crank arm (6) to achieve closing and opening with the static contact (5).

7. A fast grounding switch device according to claim 6, characterized in that: The movable contact structure comprises a guide seat (3) and a movable contact (2); the guide seat (3) is provided with a through hole for the sliding rod (7) to pass through; the movable contact (2) is mounted on a side of the guide seat (3) close to the through hole (13); one end of the crank arm (6) is rotatably mounted in the housing; the other end of the crank arm (6) is connected to the guide seat (3); When the switch is closed, the crank arm (6) rotates in the positive direction and moves the guide seat (3) to drive the moving contact (2) to move in the direction close to the stationary contact (5); When the switch is opened, the crank arm (6) rotates in the opposite direction and moves the guide seat (3) to drive the moving contact (2) to move in a direction away from the stationary contact (5).

8. A fast grounding switch device according to claim 7, characterized in that: One end of the crank arm (6) is rotatably supported, and the other end of the crank arm (6) is connected to the guide seat (3) via a bolt-type needle roller (61). The crank arm (6) makes a reciprocating motion along the sliding rod (7) during the rotation process.

9. A fast grounding switch device according to claim 1, characterized in that: An insulator (8) and a connector are also provided in the shell. The insulator (8) is arranged through a side wall of the shell. The central conductor of the insulator (8) is connected to the moving contact structure via the connector.

10. A fast grounding switch device according to claim 9, characterized in that: The connecting piece comprises a first connecting piece (91) and a second connecting piece (92); the first connecting piece (91) is made of a conductive material into an L shape; the second connecting piece (92) is made of a flexible material; one end of the first connecting piece (91) is connected to the moving contact structure; the other end of the first connecting piece (91) is connected to one end of the second connecting piece (92); the other end of the second connecting piece (92) is connected to an insulator (8); and the second connecting piece (92) is made of a plurality of copper sheets stacked together to form a soft copper strip.

11. A fast grounding switch device according to claim 1, characterized in that: The housing is composed of a box body (11) with an opening and a cover body (12). The cover body (12) is sealed to the opening of the box body (11) by bolts, and a through hole (13) is provided in the middle of the cover body (12).

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