A moving and static contact assembly for an outdoor medium voltage isolating switch

Abstract

The present invention discloses a moving and static contact assembly of an outdoor medium-voltage disconnector, and relates to the technical field of high-voltage power transmission equipment. It is used for the opening and closing and grounding actions of the disconnector, and comprises a static contact unit, which is installed on the outlet insulator of the disconnector, and the static contact unit is provided with an L-shaped static contact plate; the upper part of the vertical plate of the L-shaped static contact plate is provided with a raised locking block; the horizontal plate of the L-shaped static contact plate is connected with an outlet terminal; the moving contact unit comprises a support arm, a moving contact conductive clip, and a two-stage travel transmission frame; the rotating shaft at one end of the support arm is connected to the incoming insulator, and the moving contact conductive clip is installed at the other end; one end of the insulator transmission arm is connected to the lower end rotating shaft of the two-stage travel transmission frame. The present invention can reduce or eliminate the sliding friction of the moving and static contacts during opening and closing, and improve the service life of the moving and static contact assembly while ensuring good contact pressure of the moving and static contacts.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage power transmission equipment, in particular to a moving and stationary contact assembly of an outdoor medium-voltage isolating switch. Background Art

[0002] The isolating switch is a switch device without a special arc extinguishing device, and its arc extinguishing ability is very weak. Therefore, it cannot be used to interrupt load current or short-circuit current. The contacts of the isolating switch are exposed to the air. In the open state, there is a clearly visible break exposed to the air. In the closed state, it can reliably pass load current and short-circuit current.

[0003] There are generally two types of damage to disconnectors. One is arc burning damage caused by improper operation and load operation. The other is physical friction between the moving and static contacts during opening and closing, which causes damage to the silver-plated surface of the electrode plate, resulting in poor contact, severe local heating, and further thermal corrosion damage. The first type of damage can be effectively supervised and resolved through strict operation training and on-site management. The latter type of damage is caused by the design principle of the disconnector. In order to reduce this friction consumption, the thickness of the silver plating layer should be designed to be thicker, and the thicker the silver plating layer, the higher the cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a moving and static contact assembly for an outdoor medium-voltage disconnector in view of the above-mentioned technical deficiencies. The moving and static contact assembly can reduce or eliminate the sliding friction of the moving and static contacts during opening and closing, and improve the service life of the moving and static contact assembly while ensuring good contact pressure of the moving and static contacts.

[0005] The technical solution adopted by the present invention is to provide a moving and static contact assembly of an outdoor medium-voltage disconnector, which is used for the opening and closing and grounding actions of the disconnector, and comprises

[0006] The static contact unit is installed on the outlet insulator of the disconnector, and the static contact unit is provided with an L-shaped static contact plate; the upper part of the vertical plate of the L-shaped static contact plate is provided with a protruding locking block; the horizontal plate of the L-shaped static contact plate is connected with an outlet terminal;

[0007] The movable contact unit comprises a support arm, a movable contact conductive clip and a two-stage travel transmission frame; a rotating shaft at one end of the support arm is connected to the incoming line insulator, and a movable contact conductive clip is installed at the other end; the free end of the movable contact conductive clip and the vertical plate of the L-shaped static contact plate can be clamped and conductively matched in the horizontal direction; the movable contact conductive clip is connected to the incoming line terminal; the two-stage travel transmission frame is slidably connected to the support arm, and the two conductive plates of the movable contact conductive clip pass through the two-stage travel transmission frame; the two-stage travel transmission frame is provided with a first slide and The second slide; the first slide and the second slide are transitionally connected via a guide surface; when the two-stage travel transmission frame slides, the first slide is used to accommodate the movable contact conductive clip to maintain an open state, such an open state makes the free end of the movable contact conductive clip disengage from the vertical plate of the L-shaped stationary contact plate in the horizontal direction, and disengages from the blocking of the two conductive plates by the locking block in the vertical direction; the second slide is used to accommodate the movable contact conductive clip to maintain a clamped state, such a clamped state makes the free end of the movable contact conductive clip clamped with the vertical plate of the L-shaped stationary contact plate in the horizontal direction;

[0008] An action traction unit, the action traction unit comprises an insulator transmission arm, one end of the insulator transmission arm is connected to the lower end rotation shaft of the two-stage travel transmission frame; the other end is connected to the rotation arm rotation shaft of the insulating rod of the disconnector;

[0009] The static contact unit and / or the moving contact unit are provided with a limit device for closing the moving contact.

[0010] Preferably, the cross plate of the L-shaped static contact plate of a moving and static contact assembly of an outdoor medium-voltage disconnector is provided with two limit plates in the horizontal direction; the spacing between the limit plate and the locking block is equivalent to the vertical height of the two conductive plates of the moving contact conductive clamp; the two limit plates respectively correspond to the two conductive plates used to support the moving contact conductive clamp, so as to limit the rotation of the moving contact conductive clamp; the two limit plates constitute the limiting device for closing the moving contact.

[0011] Preferably, a support arm limit block is installed on the incoming insulator of the moving and static contact assembly of an outdoor medium-voltage disconnector, and the support arm limit block is constructed to provide a limit for the support arm when the moving contact conductive clip is horizontally aligned with the vertical plate of the L-shaped static contact plate; the support arm limit block constitutes a limit device for closing the moving contact.

[0012] Preferably, the parts where the two conductive plates of the movable contact conductive clamp of the movable and static contact assembly of an outdoor medium-voltage disconnector contact contact and the two-stage travel transmission frame are in contact are both provided with arc chamfers on the upper and lower sides.

[0013] Preferably, each limit plate of an L-shaped static contact plate of a moving and static contact assembly of an outdoor medium-voltage disconnector is equipped with a resistance ball head in the vertical direction; the resistance ball head can slide downward on the limit plate in the vertical direction; the resistance ball head is used to provide opening resistance to the conductive plate of the moving contact conductive clip on the corresponding side; when the first slide is used to accommodate the moving contact conductive clip and maintain it in an open state, the tension of the moving contact conductive clip itself can enable the conductive plate to overcome the resistance of the resistance ball head and slide over the resistance ball head.

[0014] Preferably, the movable contact conductive clip of the movable and stationary contact assembly of an outdoor medium-voltage disconnector is U-shaped; and the U-shaped structure itself provides an opening elastic force.

[0015] Preferably, the connection terminals of the two conductive plates of the moving contact conductive clip of the moving and static contact assembly of an outdoor medium-voltage disconnector are respectively fixed on the support arms; a reset spring is arranged between the two conductive plates; the reset spring is used to provide an elastic force for the moving contact conductive clip to open.

[0016] Preferably, a reset spring is provided between two conductive plates of a movable contact conductive clip of a movable and static contact assembly of an outdoor medium-voltage disconnector; the reset spring is used to assist in providing an elastic force for the movable contact conductive clip to open.

[0017] like Figure 1 In the traditional outdoor medium-voltage disconnector, the moving and static contacts adopt a sliding embedded opening and closing connection method. The moving and static contacts will have sliding friction when in contact, and in order to make good contact between the moving and static contacts, a certain pressure must be maintained between the two through a spring. This pressure will also increase the consumption of the silver plating layer when the moving and static contacts slide and rub. Different from the prior art, the technical solution adopted in this application does not use the traditional sliding embedded connection method for the closing and closing of the static contact unit and the moving contact unit. The process of closing and opening is divided into two actions: when closing, the moving contact conductive clip of the moving contact unit is first in place and horizontally aligned with the vertical plate of the L-shaped static contact plate of the static contact unit, and then the two conductive plates of the moving contact conductive clip are clamped with the vertical plate of the L-shaped static contact plate. During the movement, there is no sliding friction at the conductive coupling part, and the silver plating layer will not be damaged.

[0018] The separation and clamping of the two conductive plates and the vertical plate of the L-shaped static contact plate are achieved by sliding the two-stage travel transmission frame up and down on the support arm. The two-stage travel transmission frame realizes the transmission connection through the action traction unit, and directly utilizes the power of the opening and closing. There is no need for additional power to provide power for it alone. The structure is indirectly reliable, the manufacturing difficulty is relatively small, and the cost is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a traditional medium voltage disconnector;

[0020] Figure 2 It is a structural schematic diagram of the present invention;

[0021] Figure 3 It is a configuration of the conductive clip of the movable contact of the present invention;

[0022] Figure 4 Another configuration of the movable contact conductive clip of the present invention;

[0023] Figure 5 It is a schematic diagram of the installation of the resistance ball head of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the two-stage travel transmission frame of the present invention.

[0025] In the figure, 1. isolating switch; 2. static contact unit; 3. outgoing line insulator; 4. L-shaped static contact conductive plate; 5. vertical plate; 6. locking block; 7. horizontal plate; 8. outgoing line terminal; 9. moving contact unit; 10. support arm; 11. moving contact conductive clip; 12. two-stage travel transmission frame; 13. incoming line insulator; 14. incoming line terminal; 15. first slide; 16. second slide; 17. action traction unit; 18. insulator transmission arm; 19. insulating rod; 20. rotating force arm; 21. support arm limit block; 22. arc chamfer; 23. resistance ball head; 24. reset spring; 25. conductive plate; 26. limit plate. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 and Figure 2 As shown, the difference between the present invention and the conventional disconnector 1 lies in the difference in the moving and static contact assemblies, and the remaining parts, such as the insulating rod 19 and the insulator transmission arm 18, are basically the same; Figure 2 As shown, a moving and static contact assembly of an outdoor medium-voltage disconnector is used for opening and closing and grounding of the disconnector 1, and comprises a static contact unit 2, which is mounted on an outlet insulator 3 of the disconnector, and the static contact unit 2 is provided with an L-shaped static contact plate 4; a raised locking block 6 is provided on the upper part of a vertical plate 5 of the L-shaped static contact plate 4; and an outlet terminal 8 is connected to a horizontal plate 7 of the L-shaped static contact plate 4;

[0028] A moving contact unit 9, the moving contact unit 9 comprises a support arm 10, a moving contact conductive clip 11, and a two-stage travel transmission frame 12; one end of the support arm 10 is connected to the incoming line insulator 13, and the other end is installed with the moving contact conductive clip 11; the free end of the moving contact conductive clip 11 and the vertical plate 5 of the L-shaped static contact plate 4 can be clamped and conductively matched in the horizontal direction; the moving contact conductive clip 11 is connected to the incoming line terminal 14; the two-stage travel transmission frame 12 is slidably connected to the support arm 10, and the two conductive plates 25 of the moving contact conductive clip 11 pass through the two-stage travel transmission frame 12;

[0029] like Figure 6 As shown, the two-stage travel transmission frame 12 is provided with a first slide 15 and a second slide 16; the first slide 15 and the second slide 16 are transitionally connected by a guide surface; when the two-stage travel transmission frame 12 slides, the first slide 15 is used to accommodate the movable contact conductive clip 11 to maintain an open state, and this open state makes the free end of the movable contact conductive clip 11 disengage from the vertical plate 5 of the L-shaped stationary contact plate 4 in the horizontal direction, and disengages from the blocking of the two conductive plates 25 by the locking block 6 in the vertical direction; the second slide 16 is used to accommodate the movable contact conductive clip 11 to maintain a clamped state, and this clamped state makes the free end of the movable contact conductive clip 11 clamped with the vertical plate 5 of the L-shaped stationary contact plate 4 in the horizontal direction;

[0030] An action traction unit 17, the action traction unit 17 comprises an insulator transmission arm 18, one end of the insulator transmission arm 18 is connected to the lower end rotation shaft of the two-stage travel transmission frame 12; the other end is connected to the rotation shaft of the rotation force arm 20 of the insulating rod 19 of the disconnector;

[0031] The static contact unit 2 and / or the moving contact unit 9 are provided with a limit device for closing the moving contact.

[0032] Closing action of this embodiment:

[0033] In the open state, the moving contact conductive clip 11 is located within the stroke of the first slide 15, and the moving contact conductive clip 11 is in an open state. When the rotating force arm 20 rotates to perform the closing action, the moving contact unit 9 rotates downward following the action traction unit 17. When the moving contact unit 9 reaches the moving limit device, the support arm 10 of the contact unit stops rotating, and the insulator transmission arm 18 continues to pull down the two-stage stroke transmission frame 12, so that the second slide 16 slides to the accommodating position of the moving contact conductive clip 11, driving the moving contact conductive clip 11 to change to a clamped state. At this time, the two conductive plates 25 clamp the vertical plate 5, and at the same time, the conductive plate 25 is limited in the vertical direction by the locking block 6, and the closing action is completed.

[0034] The opening action of this embodiment:

[0035] In the closed state, the moving contact conductive clip 11 is located within the stroke of the second slide 16, and the moving contact conductive clip 11 is in a clamped state. When the rotating force arm 20 rotates to perform the opening action, the action traction unit 17 rotates upward, and the two conductive clips are limited by the locking block 6 to block the rotation of the entire support arm 10. Under the push of the insulator transmission arm 18, the two-stage stroke transmission frame 12 slides upward, so that the first slide 15 slides to the accommodating position of the moving contact conductive clip 11, and then the moving contact conductive clip 11 is changed to an open state. After being disengaged from the vertical limit of the locking block 6, the moving contact unit 9 continues to rotate as a whole to the specified breaking position, and the opening action is completed.

[0036] To further optimize this embodiment, the transverse plate of the L-shaped static contact plate 4 is provided with two limit plates 26 in the horizontal direction; the spacing between the limit plate 26 and the locking block 6 is equivalent to the vertical height of the two conductive plates 25 of the moving contact conductive clip 11; the two limit plates 26 respectively correspond to the two conductive plates 25 for supporting the moving contact conductive clip 11, so as to limit the rotation of the moving contact conductive clip 11; the two limit plates 26 constitute the limiting device for closing the moving contact.

[0037] To further optimize this embodiment, a support arm limit block 21 is installed on the incoming line insulator 13, and the support arm limit block 21 is constructed to provide a limit for the support arm 10 when the moving contact conductive clip 11 is horizontally aligned with the vertical plate 5 of the L-shaped static contact plate 4; the support arm limit block 21 constitutes the limiting device for closing the moving contact.

[0038] In the above two embodiments, the limiting devices are respectively arranged on the stationary contact unit 2 and / or the moving contact unit 9, and both can provide a limit for stopping the support arm 10 in the closing direction.

[0039] like Figure 3 and Figure 4 As shown, the present embodiment is further optimized, and arc chamfers 22 are arranged at the upper and lower parts where the two conductive plates 25 of the movable contact conductive clip 11 contact the two-stage travel transmission frame 12. The arc chamfers 22 can reduce the friction resistance between the movable contact conductive clip 11 and the first slide 15 and the second slide 16.

[0040] like Figure 5As shown, this embodiment is further optimized, each limit plate 26 of the L-shaped static contact plate 4 is equipped with a resistance ball head 23 in the vertical direction; the resistance ball head 23 can slide downward on the limit plate 26 in the vertical direction; the resistance ball head 23 is used to provide opening resistance to the conductive plate 25 of the movable contact conductive clip 11 on the corresponding side; when the first slide 15 is used to accommodate the movable contact conductive clip 11 and maintain it in an open state, the tension of the movable contact conductive clip 11 itself can enable the conductive plate 25 to overcome the resistance of the resistance ball head 23 and slide over the resistance ball head 23. The compression spring of the resistance ball head 23 is encapsulated in the position hole in the limit part, and the exposed part of the resistance ball head 23 is less than half of the sphere. When the conductive plate 25 applies a certain pressure to the resistance ball head 23, the resistance ball head 23 will be pressed down. At the same time, the resistance ball head 23 applies a reaction force to the opening and closing of the conductive plate 25. When the movable contact conductive clip 11 transitions between the first slide 15 and the second slide 16, the reaction force provided by the resistance ball head 23 can accelerate the movement of the conductive plate 25 when it passes through the resistance ball head 23. This acceleration can improve the arc extinguishing ability to a certain extent. When the isolating switch breaks a small current or a no-load current, it can provide a certain protection for the conductive plate 25 and the vertical plate 5. Another function of the resistance ball head is to allow the conductive plate to quickly escape from the vertical blocking range of the locking block when opening the gate, so that the conductive plate will not touch the locking block when rotating upward, preventing the locking block from scratching the conductive plate, thereby further ensuring the life of the silver-plated layer of the conductive plate.

[0041] like Figure 3 As shown, the present embodiment is further optimized, and the movable contact conductive clip 11 is U-shaped; the U-shaped structure itself provides the elastic force for opening. Figure 3 It can be seen that the thickness of the U-shaped bending part is thicker than that of other parts, which can improve the fatigue life and has a simple structure.

[0042] like Figure 4 As shown, this embodiment is further optimized, the connection terminals of the two conductive plates 25 of the movable contact conductive clip 11 are respectively fixed on the support arm 10; a reset spring 24 is arranged between the two conductive plates 25; the reset spring 24 is used to provide elastic force for the movable contact conductive clip 11 to open.

[0043] like Figure 3 As shown, preferably, a reset spring 24 is provided between two conductive plates 25 of a movable contact conductive clip 11 of a movable and static contact assembly of an outdoor medium-voltage disconnector; the reset spring 24 is used to assist in providing elastic force for the movable contact conductive clip 11 to open.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A moving and static contact assembly of an outdoor medium-voltage disconnector, used for opening, closing and grounding of the disconnector, characterized in that: include The static contact unit is installed on the outlet insulator of the disconnector, and the static contact unit is provided with an L-shaped static contact plate; the upper part of the vertical plate of the L-shaped static contact plate is provided with a protruding locking block; the horizontal plate of the L-shaped static contact plate is connected with an outlet terminal; The movable contact unit comprises a support arm, a movable contact conductive clip and a two-stage travel transmission frame; a rotating shaft at one end of the support arm is connected to the incoming line insulator, and a movable contact conductive clip is installed at the other end; the free end of the movable contact conductive clip and the vertical plate of the L-shaped static contact plate can be clamped and conductively matched in the horizontal direction; the movable contact conductive clip is connected to the incoming line terminal; the two-stage travel transmission frame is slidably connected to the support arm, and the two conductive plates of the movable contact conductive clip pass through the two-stage travel transmission frame; the two-stage travel transmission frame is provided with a first slide and The second slide; the first slide and the second slide are transitionally connected via a guide surface; when the two-stage travel transmission frame slides, the first slide is used to accommodate the movable contact conductive clip to maintain an open state, such an open state makes the free end of the movable contact conductive clip disengage from the vertical plate of the L-shaped stationary contact plate in the horizontal direction, and disengages from the blocking of the two conductive plates by the locking block in the vertical direction; the second slide is used to accommodate the movable contact conductive clip to maintain a clamped state, such a clamped state makes the free end of the movable contact conductive clip clamped with the vertical plate of the L-shaped stationary contact plate in the horizontal direction; An action traction unit, the action traction unit comprises an insulator transmission arm, one end of the insulator transmission arm is connected to the lower end rotation shaft of the two-stage travel transmission frame; the other end is connected to the rotation arm rotation shaft of the insulating rod of the disconnector; The static contact unit and / or the moving contact unit are provided with a limit device for closing the moving contact.

2. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 1, characterized in that: The transverse plate of the L-shaped static contact plate is provided with two limit plates in the horizontal direction; the spacing between the limit plate and the locking block is equivalent to the vertical height of the two conductive plates of the moving contact conductive clamp; the two limit plates respectively correspond to the two conductive plates used to support the moving contact conductive clamp to limit the rotation of the moving contact conductive clamp; the two limit plates constitute the limit device for closing the moving contact.

3. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 1 or 2, characterized in that: A support arm limit block is installed on the incoming line insulator, and the support arm limit block is constructed to provide a limit for the support arm when the movable contact conductive clip is aligned with the vertical plate of the L-shaped stationary contact plate in the horizontal direction; the support arm limit block constitutes the limit device for closing the movable contact.

4. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 1, characterized in that: The parts where the two conductive plates of the movable contact conductive clamp contact the two-stage travel transmission frame are both provided with arc chamfers at the top and bottom.

5. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 2, characterized in that: Each limit plate of the L-shaped static contact plate is equipped with a resistance ball head in the vertical direction; the resistance ball head can slide downward on the limit plate in the vertical direction; the resistance ball head is used to provide opening resistance to the conductive plate of the movable contact conductive clip on the corresponding side; when the first slide is used to accommodate the movable contact conductive clip and maintain it in an open state, the tension of the movable contact conductive clip itself can enable the conductive plate to overcome the resistance of the resistance ball head and slide over the resistance ball head.

6. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 1, characterized in that: The movable contact conductive clip is U-shaped; the U-shaped structure itself provides the elastic force for opening.

7. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 1, characterized in that: The connection terminals of the two conductive plates of the movable contact conductive clamp are respectively fixed on the support arms; a reset spring is arranged between the two conductive plates; the reset spring is used to provide an elastic force for the movable contact conductive clamp to open.

8. The moving and static contact assembly of an outdoor medium voltage disconnector according to claim 6, characterized in that: A return spring is arranged between the two conductive plates of the movable contact conductive clamp; the return spring is used to assist the movable contact conductive clamp in providing an elastic force to open.

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