CN211479878U

CN211479878U - Direct-striking insertion type grounding switch contact with arc striking function

Info

Publication number: CN211479878U
Application number: CN201922128404.XU
Authority: CN
Inventors: 吴上; 贺坤; 唐雪平; 吴奇钢; 郭鑫
Original assignee: Hunan Changgao High Voltage Switchgear Group Co Ltd
Current assignee: Chang Hi Tech New Technology Co ltd; Hunan Changgao High Voltage Switchgear Group Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-09-11
Anticipated expiration: 2029-12-02

Abstract

The utility model discloses a direct-striking plug-in type grounding switch contact with arc striking function, which provides guiding function for a grounding conducting rod by arranging a guiding channel, so that the grounding conducting rod enters the guiding channel at the end of a rotation stroke, and assists the grounding conducting rod to better complete the switching-on action; by arranging the arc striking device and the moving arc contact, the moving arc contact is firstly contacted with the arc striking piece during closing; when the switch is switched off, the moving contact is finally separated from the arc striking plate, so that arc ablation occurs between the moving arc contact and the arc striking plate in the switching-on and switching-off processes, the moving contact and the grounding contact finger are protected from being ablated, and the whole high-voltage grounding switch has higher capacity of switching on and off electromagnetic induction current and electrostatic induction current.

Description

Direct-striking insertion type grounding switch contact with arc striking function

Technical Field

The utility model relates to a power equipment technical field especially relates to a take direct-drive plug-in earthing switch contact of striking function.

Background

In an electric power transmission and distribution system, a high-voltage grounding switch is widely applied to a transformer substation as an electric device for grounding protection when equipment is overhauled in a high-voltage line. When the direct-striking-insertion type structure grounding switch performs closing motion, the grounding conducting rod performs upward rotary motion in a vertical plane to enable a moving contact on the grounding conducting rod to approach a grounding static contact, and then performs upward linear motion to enable the moving contact to be inserted into the grounding static contact, so that closing motion is completed. When the brake is opened, the grounding conducting rod makes a downward linear motion to make the movable contact break away from the grounding fixed contact, and then makes a downward rotary motion in a vertical plane until the brake opening action is completed.

When the coupling length of the grounding line where the grounding switch is located and the adjacent live line is long or the coupling of the adjacent live line is strong, if the grounding switch on the inlet and outlet side of the overhead high-voltage transmission line with the same tower double-loop parallel connection is adopted, the grounding switch has higher requirements on the breaking capacity of electromagnetic induction current and electrostatic induction current of equipment. For the grounding switch under the special working condition, an auxiliary arc striking device made of copper-tungsten materials with good electric and thermal conductivity, high temperature resistance, arc ablation resistance and certain plasticity is often arranged. When the grounding switch is in closing movement, the auxiliary arc striking device is firstly contacted; when the grounding switch performs opening and closing movement, the auxiliary arc striking device is finally separated, and the main contact finger are not burnt during opening and closing operation. Therefore, the high-voltage grounding switch has higher capability of opening and closing the electromagnetic induction current and the electrostatic induction current.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a take direct impact formula earthing switch contact of striking function makes high voltage earthing switch possess higher opening, close electromagnetic induction current and the ability of electrostatic induction current.

The utility model adopts the technical proposal that: a direct-strike plug-in grounding switch contact with arc strike function, comprising:

the static contact mechanism comprises a current-conducting plate, a guide cover and a grounding contact finger, wherein the guide cover comprises a cylinder part and a guide channel, one end of the cylinder part is fixedly connected to the current-conducting plate, the guide channel is transversely arranged at the other end of the cylinder part, the guide channel is in a V shape, the bottom of the channel of the guide channel is aligned with the cylinder of the cylinder part, and the grounding contact finger is matched with the cylinder part in a cylindrical shape and is arranged in the cylinder part;

the moving contact mechanism comprises a grounding conducting rod and a moving contact, the grounding conducting rod rotates by taking one point on an axis as a circle center, the moving contact is arranged at the top end of the grounding conducting rod, the guide channel is positioned on a rotating path of the moving contact, a guide opening of the guide channel faces the moving contact, and a moving arc contact is arranged at the head part of the moving contact;

the arc striking device comprises two arc striking pieces which are oppositely arranged on two sides of the inner wall of the inlet of the guide channel, the head ends of the arc striking pieces are fixedly arranged on the inner wall of the guide channel through conductive blocks, the tail ends of the arc striking pieces extend along the channel direction of the guide channel, and the tail ends of the arc striking pieces are oppositely arranged to form an outlet which is smaller than the rod diameter of the moving arc contact.

Further optimization, the rod diameter of the moving contact is larger than that of the moving arc contact, and the moving contact and the moving arc contact are connected in a smooth transition mode.

Further preferably, an insulating lining is arranged on the inner wall of the bottom of the channel of the guide channel to isolate the moving contact and the moving arc contact from contacting with the guide channel.

Further preferably, the insulating lining is U-shaped, an opening of the insulating lining is in butt joint with an outlet formed by the two arc striking sheets, and the width of the opening of the insulating lining is larger than the width of the outlet between the two arc striking sheets.

Further preferably, a spring is arranged between the outlet end of the arc striking plate and the insulating lining, and two ends of the spring are connected with the arc striking plate and the insulating lining through insulating parts.

Preferably, the cylinder part is cylindrical, an annular groove is formed in the outer side surface of the grounding contact finger, a clamping spring ring is installed in the groove, and an inner bushing is arranged on the inner side of the grounding contact finger.

Preferably, the grounding contact finger is in direct electrical contact with the conductive plate.

According to the utility model discloses take direct drive of function of striking arc to insert earthing switch contact has following beneficial effect at least:

1. the guide channel is arranged to provide a guide effect for the grounding conducting rod, so that the grounding conducting rod enters the guide channel at the tail end of the rotation stroke, and the auxiliary grounding conducting rod can better complete the switching-on action;

2. by arranging the arc striking device and the moving arc contact, the moving arc contact is firstly contacted with the arc striking piece during closing; when the switch is switched off, the moving contact is finally separated from the arc striking plate, so that arc ablation occurs between the moving arc contact and the arc striking plate in the switching-on and switching-off processes, the moving contact and the grounding contact finger are protected from being ablated, and the whole high-voltage grounding switch has higher capability of switching on and off electromagnetic induction current and electrostatic induction current.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a direct-impact insertion type grounding switch contact with an arc striking function according to an embodiment of the present invention;

fig. 2 is a schematic view of a moving contact mechanism of a direct-impact plug-in type grounding switch contact with an arc striking function rotating into a stationary contact mechanism;

fig. 3 is a bottom view of the stationary contact mechanism of fig. 1;

fig. 4 is a structural schematic diagram of the movable contact mechanism;

fig. 5 is an enlarged schematic view of the stationary contact mechanism in fig. 2.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 3, the direct-impact type earthing switch contact with arc striking function of the present invention includes:

the static contact mechanism comprises a conductive plate 100, a guide cover 200 and a grounding contact finger 300, wherein the guide cover 200 comprises a cylinder 210 and a guide channel 220, one end of the cylinder 210 is fixedly connected to the conductive plate 100, the guide channel 220 is transversely arranged at the other end of the cylinder 210, the guide channel 220 is in a V shape, the bottom of the guide channel 220 is aligned with the cylinder of the cylinder 210, and the grounding contact finger 300 is matched with the cylinder 210 and is arranged in the cylinder 210;

the moving contact mechanism comprises a grounding conducting rod 400 and a moving contact 500, wherein the grounding conducting rod 400 rotates by taking one point on an axis as a circle center, the moving contact 500 is arranged at the top end of the grounding conducting rod 400, a guide channel 220 is positioned on a rotating path of the moving contact 500, a guide opening of the guide channel 220 faces the moving contact 500, and a moving arc contact 510 is arranged at the head part of the moving contact 500;

the arc striking device comprises two arc striking pieces 610 which are oppositely arranged on two sides of the inner wall of the inlet of the guide channel 220, the head ends of the arc striking pieces 610 are fixedly arranged on the inner wall of the guide channel 220 through a conductive block 620, the tail ends of the arc striking pieces 610 extend along the channel direction of the guide channel 220, the tail ends of the two arc striking pieces 610 are oppositely arranged to form an outlet, and the outlet is smaller than the rod diameter of the moving arc contact 510.

At the time of closing, the grounding conductive rod 400 rotates from the position a to the position B in fig. 2. The movable contact 500 rotates with the grounding conductive rod 400 around a point on the axis as a center of circle, and at the end of the upward rotation stroke of the grounding conductive rod 400, the movable contact 500 enters the guide channel 220 from the opening of the guide channel 220 and continues to advance along the guide channel 220 until entering the inner wall of the bottom of the guide channel 220, and at this time, the grounding conductive rod 400 can be aligned with the cylinder 210, i.e., aligned with the grounding contact finger 300 in the cylinder 210. Under the driving of the related driving device, the grounding conductive rod 400 moves upward to accurately insert the grounding contact finger 300, thereby completing the closing operation.

When the moving contact 500 enters the guiding channel 220, when an outlet is formed by oppositely arranging the tail ends of the two arc striking pieces 610, the moving arc contact 510 at the head part of the moving contact 500 is close to the arc striking pieces 610 firstly, electric arc is generated between the arc striking pieces 610 and the moving arc contact 510, so that arc ablation in the switching-on process occurs between the moving arc contact 510 and the arc striking pieces 610, the purposes of protecting the moving contact 500 and preventing the grounding contact finger 300 from being ablated are achieved, and the whole high-voltage grounding switch has higher capability of opening, closing electromagnetic induction current and electrostatic induction current.

Meanwhile, since the outlet between the two arc striking plates 610 is smaller than the rod diameter of the moving arc contact 510, the moving arc contact 510 needs to overcome the clamping force between the two arc striking plates 610, thereby reducing the speed of the moving arc contact 510, slowing down the speed, and preventing the moving arc contact 510 from quickly colliding against the inner wall of the guide channel 220.

The arc striking plate 610 and the moving arc contact 510 are made of copper-tungsten materials which are good in electric and thermal conductivity, resistant to high temperature and arc ablation and have certain plasticity, so that the service life is prolonged.

During opening, the moving arc contact 510 is finally separated from the arc runner 610, and arc erosion also only occurs between the moving arc contact 510 and the arc runner 610.

As shown in fig. 4, in the present embodiment, the movable contact 500 has a larger rod diameter than the movable arc contact 510, and the movable arc contact are connected by a smooth transition.

After the movable arc contact 510 is ablated, the surface of the movable arc contact 510 may have a plurality of pits and protrusions, and if the uneven movable arc contact 510 directly contacts with the grounding contact finger 300, the abrasion of the grounding contact finger 300 may be increased.

By making the rod diameter of the moving arc contact 510 smaller than that of the moving contact 500, when the moving contact 500 is inserted into the grounding contact finger 300, the moving contact 500 can contact with the grounding contact finger 300, and the moving arc contact 510 cannot contact with the grounding contact finger 300, so that the situation that the grounding contact finger 300 is partially abraded by ablation is avoided.

An insulating lining 700 is arranged on the inner wall of the bottom of the guide channel 220 to isolate the moving contact 500 and the moving arc contact 510 from contacting with the guide channel 220.

The insulating lining 700 is U-shaped, the opening of the insulating lining 700 is butted with the outlet formed by the two arc ignition pieces 610, and the width of the opening of the insulating lining 700 is larger than the width of the outlet between the two arc ignition pieces 600.

The insulating lining 700 is made of high-quality insulating material to ensure that the moving contacts 500 and the moving arc contacts 510 do not directly touch the guiding cover 200.

As shown in fig. 3, a spring 630 is disposed between the outlet end of the arc striking plate 610 and the insulating liner 700, and both ends of the spring 630 are connected to the arc striking plate 610 and the insulating liner 700 through an insulating member. By providing the spring 630, the insulating liner 700 and the arc runner 600 provide the necessary contact pressure therebetween, so that the two have good contact therebetween. Meanwhile, the insulating liner 700 is U-shaped, so that the insulating liner 700 may also provide a certain guiding function.

The cylinder 210 is cylindrical, an annular groove is formed in the outer side surface of the ground contact finger 300, a clamping spring ring 800 is mounted in the groove, and an inner bushing 900 is arranged on the inner side of the ground contact finger 300.

As shown in fig. 3, in this embodiment, a structure of a cylindrical grounding contact finger 300 and a round bar-shaped moving contact 500 is adopted, the cylindrical grounding contact finger 300 is composed of a plurality of contact fingers, and a clamping spring ring 800 is installed at an outer groove position. The cylindrical grounding contact finger 300 and the round bar-shaped moving contact 500 can ensure that each contact finger can be reliably contacted with the moving contact 500 even if the center line of the moving contact 500 deviates from the center line of the grounding contact finger 300.

The inner bushing 900 and the clamping spring ring 800 interact with each other, the inner bushing 900 firstly expands the grounding contact finger 300 to a certain size, the initial resistance of the moving contact 500 inserted into the grounding contact finger 300 is reduced, and the reliable contact pressure between the grounding contact finger 300 and the moving contact 500 is ensured through the clamping spring ring 800.

The ground contact fingers 300 are in direct electrical contact with the conductive plate 100. The number of parts in the through-current path is reduced, the conductive contact surface is reduced, and other problems such as heating caused by poor contact of the conductive surface are prevented.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. The utility model provides a take direct impact formula earthing switch contact of striking arc function which characterized in that includes:

the static contact mechanism comprises a conductive plate (100), a guide cover (200) and a grounding contact finger (300), wherein the guide cover (200) comprises a cylinder part (210) and a guide channel (220), one end of the cylinder part (210) is fixedly connected to the conductive plate (100), the guide channel (220) is transversely arranged at the other end of the cylinder part (210), the guide channel (220) is V-shaped, the bottom of the channel of the guide channel (220) is aligned with the cylinder body of the cylinder part (210), and the grounding contact finger (300) is matched with the cylinder part (210) in a cylindrical shape and is arranged in the cylinder part (210);

the moving contact mechanism comprises a grounding conducting rod (400) and a moving contact (500), the grounding conducting rod (400) rotates by taking one point on an axis as a circle center, the moving contact (500) is arranged at the top end of the grounding conducting rod (400), the guide channel (220) is positioned on a rotating path of the moving contact (500), a guide opening of the guide channel (220) faces the moving contact (500), and a moving arc contact (510) is arranged at the head part of the moving contact (500);

the arc striking device comprises two arc striking pieces (610) which are oppositely arranged on two sides of the inner wall of an inlet of a guide channel (220), the head ends of the arc striking pieces (610) are fixedly arranged on the inner wall of the guide channel (220) through conductive blocks (620), the tail ends of the arc striking pieces (610) extend along the channel direction of the guide channel (220), two the tail ends of the arc striking pieces (610) are oppositely arranged to form an outlet, and the outlet is smaller than the rod diameter of a moving arc contact (510).

2. The direct-strike earthing switch contact with arc striking function according to claim 1, characterized in that: the rod diameter of the moving contact (500) is larger than that of the moving arc contact (510), and the moving contact and the moving arc contact are connected in a smooth transition mode.

3. The direct-strike earthing switch contact with arc striking function according to claim 1 or 2, characterized in that: and an insulating lining (700) is arranged on the inner wall of the bottom of the guide channel (220) to isolate the moving contact (500) and the moving arc contact (510) from contacting with the guide channel (220).

4. The direct-strike earthing switch contact with arc striking function according to claim 3, characterized in that: the insulation lining (700) is U-shaped, the opening of the insulation lining (700) is in butt joint with the outlet formed by the two arc ignition sheets (610), and the width of the opening of the insulation lining (700) is larger than the width of the outlet between the two arc ignition sheets (610).

5. The direct-strike earthing switch contact with arc striking function according to claim 4, characterized in that: a spring (630) is arranged between the outlet end of the arc striking plate (610) and the insulating lining (700), and two ends of the spring (630) are connected with the arc striking plate (610) and the insulating lining (700) through insulating parts.

6. The direct-strike earthing switch contact with arc striking function according to claim 1 or 2, characterized in that: the grounding contact finger is characterized in that the cylinder part (210) is cylindrical, an annular groove is formed in the outer side surface of the grounding contact finger (300), a clamping spring ring (800) is installed in the groove, and an inner lining (900) is arranged on the inner side of the grounding contact finger (300).

7. The direct-strike earthing switch contact with arc striking function according to claim 1 or 2, characterized in that: the grounding contact finger (300) is in direct electrical contact with the conductive plate (100).