Arc striking device for isolating switch and isolating switch

Abstract

The invention relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to an arc striking device for an isolating switch and the isolating switch. The disconnecting switch comprises an arc striking device for the disconnecting switch, the arc striking device for the disconnecting switch comprises arc striking contacts, the arc striking contacts comprise a moving arc contact and a static arc contact, the static arc contact is rotationally connected with a rotating shaft, the rotating shaft is provided with an elastic piece, and the included angle between the moving arc contact and a rotating rod of the corresponding static arc contact is smaller than 90 degrees. When the arc striking device for the disconnecting switch is installed on the disconnecting switch and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is set as L1, the shortest distance between the moving arc contact and the static contact is set as L2, L2-L1 is larger than the breakdown distance between the moving arc contact and the static contact, and L2-L1 is larger than the breakdown distance between the moving arc contact and the static contact. And the distance between the moving contact and the static contact in the moving direction of the moving contact is smaller than L2, and the designed arcing point is far away from the moving contact and the static contact, so that the moving contact and the static contact can be effectively protected, and splashing and ablation are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage or high-current switches with arc extinguishing or arc protection devices, and in particular to an arc striking device for an isolating switch and the isolating switch. Background Art

[0002] The isolating switch is a common device in the power system that can effectively isolate equipment or lines, thereby facilitating maintenance or safe power outage. The isolating switch includes a moving contact seat and a static contact seat. The moving contact seat is equipped with a moving contact, which is U-shaped. The static contact seat is equipped with a static contact perpendicular to the moving contact. The static contact is a conductive rod. The moving contact and the static contact conduct electricity through contact. A guide device is installed at the end of the moving contact away from the moving contact seat. Failure to set an arc-starting device between the moving contact and the static contact can easily lead to splashing and ablation, reduce the service life of the isolating switch, and make it difficult to open and close the switch, which may cause casualties and property losses. In some key UHV power stations, the isolating switch products arranged on the starting resistor side must meet the special requirements of being able to achieve an operation number of not less than 1,000 times without replacing the arc-starting contact device under the conditions of a closing front voltage of 50kV and a closing impact current of 400A.

[0003] The Chinese utility model patent with the authorization announcement number CN204792590U and the authorization announcement date of November 18, 2015 discloses an arc-striking device for a 220kV disconnector, which includes a conductive rod arranged below the static contact and an arc-striking contact arranged on the moving contact. The arc-striking contact is a rod-shaped structure, and the arc-striking contact is rotatably connected to one of the arms of the moving contact through a rotating rod. The rotating rod is fixedly connected with a torsion spring to ensure that the arc-striking contact and the moving contact are closely fitted. During the closing operation, the moving contact moves toward the static contact, and before the two contact, the arc-striking contact first contacts the conductive rod, and then the arc-striking contact rotates with the rotating rod until the knife switch on the moving contact contacts the conductive rod, completing the closing operation; during the opening operation, the moving contact moves in a direction away from the static contact, and the arc-striking contact rotates under the action of the torsion spring to contact the static contact until the arc-striking contact reaches the maximum rotation position, and the static contact is separated from the arc-striking contact, completing the opening operation.

[0004] During the opening and closing process of the above-mentioned disconnector, before the conductive rod contacts the arcing contact, since the arcing contact is arranged at the "U"-shaped opening of the moving contact, before the arcing contact contacts the stationary contact, the distance between the stationary contact and the moving contact is too close, which may cause breakdown. It cannot be guaranteed that the arc is generated only on the arcing contact and the conductive rod, and the arc starting point is too close to the moving contact and the stationary contact, which may cause ablation or splashing, thereby reducing the service life of the disconnector and seriously affecting the reliable operation of the power grid. Summary of the invention

[0005] The purpose of the present invention is to provide an arc striking device for a disconnector to solve the problem that the arc striking contact and the static contact are too close to the arc starting point during the opening and closing process of the arc striking device, and the reliability of the arc striking device cannot be guaranteed.

[0006] The present invention also aims to provide an isolating switch to solve the problem that the moving contact and the static contact are too close to the arc starting point during the opening and closing process of the isolating switch, thereby failing to ensure the reliability of the isolating switch.

[0007] In order to solve the above problems, the arc striking device for the isolating switch of the present invention adopts the following technical solutions: An arc-striking device for an isolating switch comprises an arc-striking contact, wherein the arc-striking contact comprises a moving arc contact for being fixedly mounted on a moving contact seat and a static arc contact for being conductively connected to a static contact, the moving arc contact and the static arc contact being arranged in one-to-one correspondence, the static arc contact being rotatably connected to a rotating shaft for being installed parallel to the static contact, the static arc contact and the rotating shaft being connected via a rotating rod, the rotating shaft being mounted on a bracket for being fixed on the static contact, an elastic member for resetting the static arc contact being arranged on the rotating shaft, the angle between the moving arc contact and the rotating rod of the corresponding static arc contact being less than 90 degrees, when the arc-striking device for an isolating switch is mounted on the isolating switch and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is assumed to be L1, the shortest distance between the moving arc contact and the static contact is assumed to be L2, L2-L1>the breakdown distance between the moving arc contact and the static contact, and the distance between the moving contact and the static contact in the moving contact movement direction is <L2.

[0008] Furthermore, the arc-striking contact is a rod-shaped structure, and the moving arc contact and the stationary arc contact are arranged perpendicular to each other.

[0009] Furthermore, two moving arc contacts are provided, which are distributed in a "V" shape, with the opening direction facing the stationary arc contact.

[0010] Furthermore, the moving arc contacts are fixedly mounted on both ends of the same moving connecting rod, and the moving connecting rod is fixedly mounted on the moving contacts via a pressure plate.

[0011] Furthermore, the rotating shafts of the static arc contacts are coaxially installed, and the distances between the static arc contacts and the rotating shafts are the same.

[0012] Furthermore, a conductive belt is provided on the rotating shaft for achieving conductive connection between the static arc contact and the static contact.

[0013] Furthermore, a bolt hole is provided on the moving arc contact, and the moving arc contact can be adjustably inserted into the moving connecting rod.

[0014] Furthermore, a bolt hole is provided on the static arc contact, and the static arc contact can be adjustably inserted into the static connecting rod.

[0015] Furthermore, the elastic member is a torsion spring, which corresponds to the static arc contact one by one and is sleeved and fixed on the rotating shaft.

[0016] Beneficial effects: The arc-striking device for the isolating switch of the present invention is an improved invention. The arc-striking device for the isolating switch of the present invention includes an arc-striking contact, which is the main component for achieving the arc-striking effect to prevent the moving contact and the static contact from being burned. The arc-striking contact includes a moving arc contact for being fixedly mounted on the moving contact seat and a static arc contact for being conductively connected to the static contact seat. The moving arc contact and the static arc contact are arranged in a one-to-one correspondence, and one-to-one corresponding arc-striking contacts are arranged at both ends of the moving contact and the static contact. Compared with the existing design for preventing the burning of the static contact, the effect is better and the maintenance cost is lower. The static arc contact is rotatably connected with a rotating shaft for installation parallel to the static contact. The static arc contact is a movable connection. During the opening and closing process of the isolating switch, the reliability of the arc-striking device can be ensured by changing the position. The rotating shaft is provided with an elastic member for resetting the static arc contact. Parts are provided, and elastic parts can be displaced in real time during opening and closing to ensure the contact between the moving and static arc contacts to achieve the arc striking effect. The angle between the moving arc contact and the rotating rod of the corresponding static arc contact is less than 90 degrees, ensuring that the moving arc contact can push the static arc contact to move. When the arc striking device for the disconnector is installed on the disconnector and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is L1, and the shortest distance between the moving arc contact and the static contact is L2. L2-L1>the shortest breakdown distance between the moving arc contact and the static contact, and the distance between the moving contact and the static contact in the moving contact movement direction is <L2. The arc starting point of this design is far away from the moving and static contacts, which can achieve effective protection for the moving and static contacts to avoid splashing and ablation.

[0017] In order to solve the above problems, the isolating switch of the present invention adopts the following technical solutions: A disconnector, comprising an arc-striking device for the disconnector, the arc-striking device for the disconnector comprising an arc-striking contact, the arc-striking contact comprising a moving arc contact for being fixedly mounted on a moving contact seat and a static arc contact for being conductively connected to a static contact, the moving arc contact and the static arc contact being arranged one by one, the static arc contact being rotatably connected to a rotating shaft for being installed parallel to the static contact, the static arc contact and the rotating shaft being connected via a rotating rod, the rotating shaft being mounted on a bracket for being fixed on the static contact, the rotating shaft being provided with An elastic member used to reset the static arc contact, an angle between the moving arc contact and the rotating rod of the corresponding static arc contact is less than 90 degrees, when the arc striking device for the disconnector is installed on the disconnector and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is L1, the shortest distance between the moving arc contact and the static contact is L2, L2-L1> the breakdown distance between the moving arc contact and the static contact, and the distance between the moving contact and the static contact in the moving contact movement direction is <L2.

[0018] Furthermore, the arc-striking contact is a rod-shaped structure, and the moving arc contact and the stationary arc contact are arranged perpendicular to each other.

[0019] Furthermore, two moving arc contacts are provided, which are distributed in a "V" shape, with the opening direction facing the stationary arc contact.

[0020] Furthermore, the moving arc contacts are fixedly mounted on both ends of the same moving connecting rod, and the moving connecting rod is fixedly mounted on the moving contacts via a pressure plate.

[0021] Furthermore, the rotating shafts of the static arc contacts are coaxially installed, and the distances between the static arc contacts and the rotating shafts are the same.

[0022] Furthermore, a conductive belt is provided on the rotating shaft for achieving conductive connection between the static arc contact and the static contact.

[0023] Furthermore, a bolt hole is provided on the moving arc contact, and the moving arc contact can be adjustably inserted into the moving connecting rod.

[0024] Furthermore, a bolt hole is provided on the static arc contact, and the static arc contact can be adjustably inserted into the static connecting rod.

[0025] Furthermore, the elastic member is a torsion spring, which corresponds to the static arc contact one by one and is sleeved and fixed on the rotating shaft.

[0026] Beneficial effects: The isolating switch of the present invention is an improved invention. The isolating switch of the present invention includes an arc-striking device for the isolating switch, and the arc-striking device for the isolating switch includes an arc-striking contact. The arc-striking contact is the main component for achieving arc-striking effect to prevent the moving contact and the static contact from being burned. The arc-striking contact includes a moving arc contact for being fixedly mounted on the moving contact seat and a static arc contact for being conductively connected to the static contact seat. The moving arc contact and the static arc contact are arranged in a one-to-one correspondence, and one-to-one corresponding arc-striking contacts are arranged at both ends of the moving contact and the static contact. Compared with the existing design for preventing the static contact from being burned, the effect is better and the maintenance cost is lower. The static arc contact is rotatably connected with a rotating shaft for being installed parallel to the static contact. The static arc contact is a movable connection. During the opening and closing process of the isolating switch, the reliability of the arc-striking device can be ensured by changing the position. The rotating shaft is provided with a rotating shaft for achieving static arc-striking effect. The elastic part for resetting the arc contact is arranged so that the elastic part can be displaced in real time during opening and closing to ensure the contact between the moving and static arc contacts to achieve the arc striking effect. The angle between the moving arc contact and the rotating rod of the corresponding static arc contact is less than 90 degrees, ensuring that the moving arc contact can push the static arc contact to move. When the arc striking device for the disconnector is installed on the disconnector and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is L1, and the shortest distance between the moving arc contact and the static contact is L2. L2-L1>the shortest breakdown distance between the moving arc contact and the static contact, and the distance between the moving contact and the static contact in the moving contact movement direction is <L2. The arc starting point of this design is far away from the moving and static contacts, which can achieve effective protection for the moving and static contacts to avoid splashing and ablation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment of an arc striking device for a disconnector of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the arc-starting device for the disconnector in the closed state; Figure 3 for Figure 1 Assembly diagram of the static arc contact; Figure 4 for Figure 3 Assembly diagram of the torsion spring.

[0028] In the figure: 1. moving arc contact; 2. moving connecting rod; 3. moving contact; 4. moving contact seat; 5. pressure plate; 6. stationary arc contact; 7. stationary connecting rod; 8. connecting block; 9. rotating rod; 10. bracket; 11. conductive belt; 12. torsion spring; 13. rotating shaft; 14. stationary contact. DETAILED DESCRIPTION

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] The arc starting device of the isolating switch is an important structure for protecting the conductive contacts of the isolating switch and improving the service life of the isolating switch. The concept of the present invention is to improve the operation stability and service life of the isolating switch by keeping the arc starting point of the isolating switch away from the moving contact and the stationary contact.

[0031] The specific implementation of the arc striking device for the disconnector of the present invention is as follows: Based on the above concept, in a basic embodiment, the arc-striking device for the isolating switch of the present invention includes an arc-striking contact, which is a main component for realizing the arc-striking function to prevent the moving contact 3 and the static contact 14 from being burned. The arc-striking contact includes a moving arc contact 1 for being fixedly mounted on the moving contact seat 4 and a static arc contact 6 for being conductively connected to the static contact seat. The moving arc contact 1 and the static arc contact 6 are arranged in a one-to-one correspondence, and arc-striking contacts are arranged in a one-to-one correspondence at both ends of the moving contact 3 and the static contact 14. Compared with the existing design for preventing the static contact 14 from being burned, the static arc contact 6 is rotatably connected to a rotating shaft 13 for being installed parallel to the static contact 14. The static arc contact 6 is a movably connected. During the opening and closing process of the isolating switch, the reliability of the arc-striking device can be ensured by changing its position. The rotating shaft 13 is installed on a bracket 10 fixed on the static contact 14. The rotating shaft 13 is provided with an elastic member for resetting the static arc contact 6. The elastic member can be displaced in real time during opening and closing to ensure that the moving and static arc contacts 6 are in contact to achieve the arc striking effect. When the arc striking device for the isolating switch is installed on the isolating switch and the moving arc contact 1 is not in contact with the static arc contact 6, the shortest distance between the moving arc contact 1 and the static arc contact 6 is L1, and the shortest distance between the moving arc contact 1 and the static contact 14 is L2. L2-L1>the shortest breakdown distance between the moving arc contact 1 and the static contact 14, and the distance between the moving contact 3 and the static contact 14 in the moving direction of the moving contact 3 is <L2. The arc starting point of this design is far away from the moving and static contacts, which can achieve effective protection of the moving and static contacts to avoid splashing and ablation.

[0032] In a preferred embodiment, the arc-striking contact is a rod-shaped structure, and the moving arc contact 1 and the static arc contact 6 are arranged perpendicular to each other. By vertically arranging the arc-striking contact, it is possible to ensure good contact between the moving arc contact 1 and the static arc contact 6 during the opening and closing of the disconnector, and avoid poor contact between the two due to vibration or slippage, which affects the safe operation of the disconnector. In other embodiments, the arc-striking contact can be designed to be spherical or square. Although the arc-striking contact is severely eroded during operation and needs to be replaced frequently, it can still work normally.

[0033] like Figure 1 As shown, in a preferred embodiment, two moving arc contacts 1 are provided, which are distributed in a "V" shape, with the opening direction facing the static arc contact 6. Two groups of arc-striking contacts are provided to ensure the stable operation of the arc-striking device. Even if a group of arc-striking contacts or elastic members are deformed and cannot play the arc-striking role, the normal operation of the arc-striking device for the disconnector is not affected. In other embodiments, only one moving contact 3 can be designed. Although the reliability of the arc-striking device for the disconnector will be reduced, all functions of the arc-striking device can be realized and it can work normally.

[0034] In a preferred embodiment, the moving arc contact 1 is fixedly mounted on both ends of the same moving connecting rod 2, and the moving connecting rod 2 is fixedly mounted on the moving contact 3 through a pressure plate 5. This structure can enhance the flow capacity of the moving arc contact 1 and the moving contact 3, and prevent the moving arc contact 1 from being in virtual contact and failing to strike an arc.

[0035] In a preferred embodiment, the rotating shaft 13 of each static arc contact 6 is installed coaxially, and the distance between the static arc contact 6 and the rotating shaft 13 is the same, ensuring the synchronization of the two groups of arc-striking contacts, which can reduce the loss and ablation of the arc-striking contacts, increase the service life of the arc-striking device for the disconnector, and improve the stability and safety of the operation of the disconnector.

[0036] like Figure 3 As shown, in a preferred embodiment, a conductive belt 11 for realizing the conductive connection between the static arc contact 6 and the static contact 14 is provided on the rotating shaft 13. By adding the conductive belt 11, it is possible to ensure that the static arc contact 6 and the static contact 14 maintain good flow, and avoid the static arc contact 6 being in virtual connection and unable to play the arc-starting role as it should. During the closing process, the moving arc contact 1 and the static arc contact 6 are in contact to realize flow, and avoid the arc generated by the pressure difference when the moving and mirror contacts are closed, resulting in ablation. When opening the switch, the moving contact 3 and the static contact 14 are separated first, and the moving arc contact 1 and the static arc contact 6 still maintain contact and conduction. In other embodiments, through the contact finger connection, a good electrical connection can also be guaranteed, and a similar effect can be achieved, and normal operation can be achieved.

[0037] In a preferred embodiment, a bolt hole is provided on the moving arc contact 1, and the moving arc contact 1 can be adjustably inserted into the moving connecting rod 2. During on-site installation, the installation position of the moving arc contact 1 can be adjusted according to actual needs to protect the moving contact 3 and the static contact 14 of the disconnector. In other embodiments, the moving arc contact 1 can also be fixedly installed on the moving connecting rod 2 by threading. Although it increases the difficulty of on-site installation, it can still work normally. The moving connecting rod 2 is fixed to the moving contact seat 4 by setting a pressure plate 5, which ensures the stability of the flow of the two and prevents the moving arc contact 1 from being falsely connected.

[0038] In a preferred embodiment, a bolt hole is provided on the static arc contact 6, and the static arc contact 6 can be adjustably inserted into the static connecting rod 7. During on-site installation, the installation position of the static arc contact 6 can be adjusted according to actual needs to protect the moving contact 3 and the static contact 14 of the disconnector. In other embodiments, the static arc contact 6 can also be fixedly installed on the static connecting rod 7 by threading. Although it increases the difficulty of on-site installation, it can still work normally. The static connecting rod 7 is connected to the rotating rod 9 through the connecting block 8, and the end of the rotating rod 9 away from the static connecting rod 7 is fixed on the rotating shaft 13 to achieve rotational fit.

[0039] like Figure 4As shown, in a preferred embodiment, the elastic member is a torsion spring 12, which corresponds to the static arc contact 6 one by one and is fixed on the rotating shaft 13. The elastic member adopts the torsion spring 12 to better realize the resetting of the static arc contact 6. At the same time, the torsion spring 12 can ensure the stability of the connection between the moving arc contact 1 and the static arc contact 6 during the opening and closing process, and avoid virtual connection between the two, which will cause erosion of the moving contact 3 and the static contact 14, affecting the safe operation of the disconnector.

[0040] like Figure 2 As shown, during the closing process, when the arc-striking contacts have not yet touched, the moving arc contact 1 gradually moves toward the static arc contact 6 in a translational manner until the two are in contact, and the moving arc contact 1 continues to move in a translational manner, and the static arc contact 6 and the moving arc contact 1 are tightly attached under the action of the torsion spring 12, and the static arc contact 6 rotates around the rotating shaft 13 in the direction of travel of the moving arc contact 1 until the moving contact 3 and the static contact 14 are closed, at which time the two remain stationary; during the opening process, the moving contact 3 and the static contact 14 are separated first, and the moving arc contact 1 moves in a translational manner away from the static contact 14 until the moving arc contact 1 and the static arc contact 6 are separated, and the disconnector is opened. During the whole process, the distance between the moving arc contact 1 and the static contact 14 is greater than the distance between the moving arc contact 1 and the static arc contact 6 by at least 200 mm to ensure that the arc is only generated between the arc-striking joints, and the arc starting point is prevented from being close to the moving contact 3 and the static contact 14 to avoid ablation and splashing.

[0041] The specific implementation of the isolating switch of the present invention is as follows: Based on the above conception, in a basic embodiment, the isolating switch of the present invention includes an arc-striking device for the isolating switch, and the arc-striking device for the isolating switch includes an arc-striking contact, which is a main component for achieving an arc-striking effect to prevent the moving contact 3 and the static contact 14 from being burned. The arc-striking contact includes a moving arc contact 1 for being fixedly mounted on the moving contact seat 4 and a static arc contact 6 for being conductively connected to the static contact seat. The moving arc contact 1 and the static arc contact 6 are arranged in a one-to-one correspondence, and arc-striking contacts are arranged in a one-to-one correspondence at both ends of the moving contact 3 and the static contact 14. Compared with the existing design for preventing the static contact 14 from being burned, the static arc contact 6 is rotatably connected to a rotating shaft 13 for being installed parallel to the static contact 14. The static arc contact 6 is a movably connected, and arc-striking can be ensured by changing its position during the opening and closing process of the isolating switch. The device is reliable, the rotating shaft 13 is installed on the bracket 10 fixed on the static contact 14, and the rotating shaft 13 is provided with an elastic member for realizing the resetting of the static arc contact 6. The elastic member can be displaced in real time during the opening and closing of the switch to ensure the contact between the moving and static arc contacts 6 to achieve the arc striking effect. When the arc striking device for the isolating switch is installed on the isolating switch and the moving arc contact 1 is not in contact with the static arc contact 6, the shortest distance between the moving arc contact 1 and the static arc contact 6 is L1, and the shortest distance between the moving arc contact 1 and the static contact 14 is L2, L2-L1>the shortest breakdown distance between the moving arc contact 1 and the static contact 14, and the distance between the moving contact 3 and the static contact 14 in the moving direction of the moving contact 3 is<L2. The arc starting point of this design is far away from the moving contact 3 and the static contact 14, which can realize effective protection of the moving and static contacts and avoid splashing and ablation.

[0042] In a preferred embodiment, the arc-striking contact is a rod-shaped structure, and the moving arc contact 1 and the static arc contact 6 are arranged perpendicular to each other. By vertically arranging the arc-striking contact, it is possible to ensure good contact between the moving arc contact 1 and the static arc contact 6 during the opening and closing of the disconnector, and avoid poor contact between the two due to vibration or slippage, which affects the safe operation of the disconnector. In other embodiments, the arc-striking contact can be designed to be spherical or square. Although the arc-striking contact is severely eroded during operation and needs to be replaced frequently, it can still work normally.

[0043] like Figure 1 As shown, in a preferred embodiment, two moving arc contacts 1 are provided, which are distributed in a "V" shape, with the opening direction facing the static arc contact 6. Two groups of arc-striking contacts are provided to ensure the stable operation of the arc-striking device. Even if a group of arc-striking contacts or elastic members are deformed and cannot play the arc-striking role, the normal operation of the arc-striking device for the disconnector is not affected. In other embodiments, only one moving contact 3 can be designed. Although the reliability of the arc-striking device for the disconnector will be reduced, all functions of the arc-striking device can be realized and it can work normally.

[0044] In a preferred embodiment, the moving arc contact 1 is fixedly mounted on both ends of the same moving connecting rod 2, and the moving connecting rod 2 is fixedly mounted on the moving contact 3 through a pressure plate 5. This structure can enhance the flow capacity of the moving arc contact 1 and the moving contact 3, and prevent the moving arc contact 1 from being in virtual contact and failing to strike an arc.

[0045] In a preferred embodiment, the rotating shaft 13 of each static arc contact 6 is installed coaxially, and the distance between the static arc contact 6 and the rotating shaft 13 is the same, ensuring the synchronization of the two groups of arc-striking contacts, which can reduce the loss and ablation of the arc-striking contacts, increase the service life of the arc-striking device for the disconnector, and improve the stability and safety of the operation of the disconnector.

[0046] like Figure 3 As shown, in a preferred embodiment, a conductive belt 11 for realizing the conductive connection between the static arc contact 6 and the static contact 14 is provided on the rotating shaft 13. By adding the conductive belt 11, it is possible to ensure that the static arc contact 6 and the static contact 14 maintain good flow, and avoid the static arc contact 6 being in virtual connection and unable to play the arc-starting role as it should. During the closing process, the moving arc contact 1 and the static arc contact 6 are in contact to realize flow, and avoid the arc generated by the pressure difference when the moving and mirror contacts are closed, resulting in ablation. When opening the switch, the moving contact 3 and the static contact 14 are separated first, and the moving arc contact 1 and the static arc contact 6 still maintain contact and conduction. In other embodiments, through the contact finger connection, a good electrical connection can also be guaranteed, and a similar effect can be achieved, and normal operation can be achieved.

[0047] In a preferred embodiment, a bolt hole is provided on the moving arc contact 1, and the moving arc contact 1 can be adjustably inserted into the moving connecting rod 2. During on-site installation, the installation position of the moving arc contact 1 can be adjusted according to actual needs to protect the moving contact 3 and the static contact 14 of the disconnector. In other embodiments, the moving arc contact 1 can also be fixedly installed on the moving connecting rod 2 by threading. Although it increases the difficulty of on-site installation, it can still work normally. The moving connecting rod 2 is fixed to the moving contact seat 4 by setting a pressure plate 5, which ensures the stability of the flow of the two and prevents the moving arc contact 1 from being falsely connected.

[0048] In a preferred embodiment, a bolt hole is provided on the static arc contact 6, and the static arc contact 6 can be adjustably inserted into the static connecting rod 7. During on-site installation, the installation position of the static arc contact 6 can be adjusted according to actual needs to protect the moving contact 3 and the static contact 14 of the disconnector. In other embodiments, the static arc contact 6 can also be fixedly installed on the static connecting rod 7 by threading. Although it increases the difficulty of on-site installation, it can still work normally. The static connecting rod 7 is connected to the rotating rod 9 through the connecting block 8, and the end of the rotating rod 9 away from the static connecting rod 7 is fixed on the rotating shaft 13 to achieve rotational fit.

[0049] like Figure 4As shown, in a preferred embodiment, the elastic member is a torsion spring 12, which corresponds to the static arc contact 6 one by one and is fixed on the rotating shaft 13. The elastic member is a torsion spring 12, which can better realize the resetting of the static arc contact 6. At the same time, the torsion spring 12 can ensure the stability of the connection between the moving arc contact 1 and the static arc contact 6 during the opening and closing process, and avoid virtual connection between the two, which will cause erosion of the moving contact 3 and the static contact 14, affecting the safe operation of the disconnector.

[0050] like Figure 2 As shown, during the closing process, when the arc-striking contacts have not yet touched, the moving arc contact 1 gradually moves toward the static arc contact 6 in a translational manner until the two are in contact, and the moving arc contact 1 continues to move in a translational manner, and the static arc contact 6 and the moving arc contact 1 are tightly attached under the action of the torsion spring 12, and the static arc contact 6 rotates around the rotating shaft 13 in the direction of travel of the moving arc contact 1 until the moving contact 3 and the static contact 14 are closed, at which time the two remain stationary; during the opening process, the moving contact 3 and the static contact 14 are separated first, and the moving arc contact 1 moves in a translational manner away from the static contact 14 until the moving arc contact 1 and the static arc contact 6 are separated, and the disconnector is opened. During the whole process, the distance between the moving arc contact 1 and the static contact 14 is greater than the distance between the moving arc contact 1 and the static arc contact 6 by at least 200 mm to ensure that the arc is only generated between the arc-striking joints, and the arc starting point is prevented from being close to the moving contact 3 and the static contact 14 to avoid ablation and splashing.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An arc striking device for an isolating switch, comprising an arc striking contact, characterized in that: The arc-striking contact comprises a moving arc contact for being fixedly mounted on a moving contact seat and a static arc contact for being conductively connected to a static contact. The moving arc contact and the static arc contact are arranged in one-to-one correspondence. The static arc contact is rotatably connected to a rotating shaft for being installed parallel to the static contact. The static arc contact and the rotating shaft are connected via a rotating rod. The rotating shaft is installed on a bracket for being fixed on the static contact. An elastic member for resetting the static arc contact is arranged on the rotating shaft. The angle between the moving arc contact and the rotating rod of the corresponding static arc contact is less than 90 degrees. When the arc-striking device for the disconnector is installed on the disconnector and the moving arc contact is not in contact with the static arc contact, the shortest distance between the moving arc contact and the static arc contact is L1, and the shortest distance between the moving arc contact and the static contact is L2. L2-L1>the breakdown distance between the moving arc contact and the static contact, and the distance between the moving contact and the static contact in the moving contact movement direction is <L2.

2. The arc striking device for disconnector according to claim 1, characterized in that: The arc-striking contact is a rod-shaped structure, and the moving arc contact and the static arc contact are arranged perpendicular to each other.

3. The arc striking device for disconnecting switch according to claim 2, characterized in that: The moving arc contacts are provided with two, which are distributed in a "V" shape, and the opening direction is toward the stationary arc contact.

4. The arc striking device for disconnector according to claim 3, characterized in that: The moving arc contacts are fixedly mounted on the two ends of the same moving connecting rod, and the moving connecting rod is fixedly mounted on the moving contacts via a pressing plate.

5. The arc striking device for disconnecting switch according to claim 3 or 4, characterized in that: The rotating shafts of each static arc contact are coaxially installed, and the distances between the static arc contact and the rotating shaft are the same.

6. The arc striking device for disconnecting switch according to any one of claims 1 to 4, characterized in that: The rotating shaft is provided with a conductive belt for realizing conductive connection between the static arc contact and the static contact.

7. The arc striking device for disconnecting switch according to any one of claims 1 to 4, characterized in that: The moving arc contact is provided with a bolt hole, and the moving arc contact can be adjustably inserted into the moving connecting rod.

8. The arc striking device for disconnecting switch according to any one of claims 1 to 4, characterized in that: The static arc contact is provided with a bolt hole, and the static arc contact can be adjustably inserted into the static connecting rod.

9. The arc striking device for disconnecting switch according to any one of claims 1 to 4, characterized in that: The elastic member is a torsion spring, which corresponds to the static arc contact one by one and is sleeved and fixed on the rotating shaft.

10. A disconnector, comprising an arc striking device, characterized in that: The arc striking device is an arc striking device for a disconnector as described in any one of claims 1 to 9.

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