A sub-clamp for live processing of a heating band of a power transformer knife switch contact and a working method thereof

Abstract

The present application relates to a kind of substation knife gap contact heating live processing shunt clamp and its operation method, including the first installation part and the second installation part of electrically conductive material, first installation part or second installation part is installed on knife gap static contact arm, knife gap movable contact arm respectively by clamping mechanism, first installation part and second installation part are respectively provided with electrically conductive clamp and electrically conductive column, electrically conductive clamp side is provided with the opening for the electrically conductive column to go out, electrically conductive column follows substation knife gap movable contact and substation knife gap static contact opening and closing and goes out the opening of electrically conductive clamp, when knife gap static contact and movable contact heat, can be installed shunt clamp in the live condition, by live working mode of ground potential, avoid movable contact and static contact between heat deterioration, when equipment is planned power off, maintenance is carried out to contact.Electrically conductive clamp and electrically conductive column can follow knife gap separation and separate automatically, effectively avoid malignant event caused by knife gap unable to open in emergency.

Description

Technical Field

[0001] This invention relates to a shunt clamp for heating and shunting current of a substation switch contact and its operating method, belonging to the field of power technology. Background Technology

[0002] High-voltage disconnectors in substations are among the most common and widely used electrical devices in the power grid. The moving and stationary contacts are among the weakest components of these disconnectors. Due to prolonged operation and inadequate maintenance, problems such as poor contact, overheating, and arcing may occur between the moving and stationary contacts. These issues cannot be resolved without a power outage, threatening the safe operation of the power grid.

[0003] If not handled promptly, it may cause the contacts to melt and lead to a power outage. In the past, when the contacts of the knife switch overheated, the equipment could only be de-energized before the stationary and moving contact arms of the knife switch could be opened for maintenance, which would affect the electricity supply for social production and daily life. In order not to affect the electricity supply for social production, a current shunt clamp needs to be installed between the moving and stationary contacts to shunt the current.

[0004] In emergency situations, it is necessary to separate the moving and stationary contacts of the switch. However, installing a shunt clamp will restrict and fix the moving and stationary contacts together, causing a serious incident where the moving and stationary contacts cannot be separated. Therefore, the shunt clamp needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a current shunt clamp for heating and energizing the contacts of a substation switch and its operating method, so as to solve the problems mentioned in the background art.

[0006] The technical solution of the present invention is as follows:

[0007] A current-shunting clamp for heating the contacts of a substation disconnect switch includes a first mounting part and a second mounting part made of conductive material. Both the first and second mounting parts are equipped with clamping mechanisms. These clamping mechanisms respectively mount the corresponding first or second mounting part onto the stationary contact arm and the moving contact arm of the disconnect switch. The first and second mounting parts are respectively equipped with conductive clamps and conductive posts, which are electrically connected. One side of the conductive clamp has an opening for the conductive post to enter and exit. The conductive post follows the opening and closing of the moving and stationary contacts of the substation disconnect switch, moving in and out of the opening of the conductive clamp.

[0008] Preferably, the conductive clip is a U-shaped structure made of elastic material.

[0009] Preferably, the conductive clip of the U-shaped structure has both ends bent outwards.

[0010] Preferably, the clamping mechanism includes a conductive locking claw fixedly disposed on the upper part of the corresponding first mounting part or second mounting part, and an adjusting screw threadedly connected to the corresponding first mounting part or second mounting part. One end of the adjusting screw is connected to a movable locking claw, and rotating the adjusting screw causes the movable locking claw to move closer to or away from the corresponding conductive locking claw.

[0011] Preferably, the conductive post includes a fixed part and a movable part, an elastic element is provided between the fixed part and the movable part, and the movable part is pressed onto the fixed part by a threaded rod.

[0012] Preferably, a positioning part made of insulating material is detachably installed on the first or second mounting part, and the shape of the positioning part is adapted to the interval between the stationary contact rotating arm and the moving contact rotating arm of the knife switch.

[0013] Preferably, the positioning part is provided with a clamping member, the clamping member is provided with a guide member, the first mounting part or the second mounting part is provided with a guide groove, the guide member and the guide groove are slidably engaged, and the clamping member is provided with a lifting ring.

[0014] Preferably, both the first mounting part and the second mounting part are provided with slots, and a horizontal plate is provided that fits against both the first mounting part and the second mounting part. The horizontal plate is provided with at least two sets of locking posts, which are inserted into the slots for detachable engagement from bottom to top. A locking member is installed on the horizontal plate, which is used to clamp and fix the operating rod to the outside.

[0015] Preferably, the locking member has a plurality of annular array anti-slip elements protruding outward from its sidewall.

[0016] Preferably, an elastic element is installed on the locking post, and the elastic element elastically abuts against the inner wall of the corresponding locking groove through its elastic force.

[0017] A method for operating a shunt clamp for heating and energizing the contacts of a substation switch includes the following steps:

[0018] S1. Remove the oxide layer on the rotating arm of the stationary contact of the disconnector and the rotating arm of the moving contact of the disconnector.

[0019] S2, the conductive post and the conductive clamp are tightly connected;

[0020] S3. First, fix the flush part on the insulating operating rod, and then install the first mounting part and the second mounting part on the flush part;

[0021] S4. Lift the insulating operating rod and hang the first and second mounting parts on the corresponding knife switch stationary contact rotating arm and knife switch moving contact rotating arm, and position them through the positioning part so that the positions of the conductive clamp and conductive post coincide with the dividing point between the moving contact and stationary contact of the knife switch.

[0022] S5. Use the insulating operating rod to operate the clamping mechanism to fix the corresponding first mounting part and second mounting part;

[0023] S6. Use the insulated operating rod to pull away the positioning part and the flush part.

[0024] The present invention has the following beneficial effects:

[0025] A shunt clamp can be installed in a live-line working manner that allows the equipment to operate above ground potential, thus preventing overheating between the moving and stationary contacts. The contacts can then be repaired when the equipment is scheduled to be de-energized.

[0026] The conductive clamp and conductive post can automatically separate when the knife switch is disconnected, effectively preventing serious incidents caused by the knife switch failing to open in an emergency.

[0027] This clamp does not require power outages, load reduction, or load transfer. It can be used for live-line work at ground potential while the disconnector is energized. Using an insulated operating rod, the clamp can be installed on both sides of the disconnector contacts while standing on the ground, short-circuiting the moving and stationary contacts to achieve current diversion and cooling. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the separation structure of the present invention;

[0030] Figure 3 for Figure 2 Another structural diagram;

[0031] Figure 4 This is a schematic diagram of the opening and closing structure of the conductive clip and conductive post of the present invention;

[0032] Figure 5 This is a schematic diagram of a structural application scenario of the present invention;

[0033] Figure 6 This is a schematic diagram of the flow divider clamp, positioning part, and flush part of the present invention;

[0034] Figure 7 This is a schematic diagram of the positioning part and the second mounting part of the present invention;

[0035] Figure 8 This is a schematic diagram of the flush section structure of the present invention.

[0036] The reference numerals in the figure are as follows:

[0037] 1. First mounting part; 2. Second mounting part; 21. Slot; 22. Guide slot; 3. Adjusting screw; 4. Movable locking claw; 5. Conductive clamp; 6. Conductive post; 61. Fixing part; 62. Movable part; 7. Conductive locking claw; 8. Knife switch stationary contact rotating arm; 9. Knife switch moving contact rotating arm; 10. Positioning part; 101. Clamping component; 102. Guide component; 103. Lifting ring; 11. Flush part; 111. Horizontal plate; 112. Locking component; 113. Anti-slip component; 114. Locking post; 115. Elastic component. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1-4 As shown, the first mounting part 1 / second mounting part 2 has an L-shaped structure. The upper part of the first mounting part 1 / second mounting part 2 forms a corresponding conductive locking claw 7. The adjusting screw 3 is threadedly connected to the lower part of the corresponding first mounting part 1 / second mounting part 2. The upper end of the adjusting screw 3 is movably connected to the movable locking claw 4. The movable locking claw 4 fits against the side wall of the corresponding first mounting part 1 / second mounting part 2. Rotating the adjusting screw 3 drives the movable locking claw 4 to move vertically in a straight line along the side wall of the corresponding first mounting part 1 / second mounting part 2, thereby moving closer to or further away from the corresponding conductive locking claw 7.

[0040] The movable locking claw 4, the conductive locking claw 7, and the corresponding first mounting part 1 / second mounting part 2 form a "C"-shaped structure. The lower end of the adjusting screw 3 has an external hexagonal structure to facilitate rotation by external tools.

[0041] The lower end of the first mounting part 1 is electrically connected to a conductive clip 5. The conductive clip 5 can be made of copper and has a certain elastic deformation capability. The conductive clip 5 has a "U" shaped structure with an opening in one direction.

[0042] The lower end of the second mounting part 2 is electrically connected to a conductive post 6. The conductive post 6 includes a fixed part 61 and a movable part 62. The fixed part 61 is fixed to the second mounting part 2, and the movable part 62 is mounted on the fixed part 61 via a metal threaded rod. Several elastic elements (not shown in the attached drawings, but could be strong compression springs) are provided between the fixed part 61 and the movable part 62. The elastic force of the elastic elements drives the movable part 62 to move away from the fixed part 61. The fixed part 61 and the movable part 62 together form an approximately cylindrical shape (compatible with the internal structure of the conductive clamp 5). The elastic elements ensure the pressure between the conductive post 6 and the conductive clamp 5, preventing insufficient metal contact pressure between the conductive post 6 and the conductive clamp 5, which would affect the flow performance. However, the pressure cannot be too high. If the clamping force between the conductive post 6 and the conductive clamp 5 is too high, it will affect the opening of the switch, or even prevent the switch from opening. Therefore, the distance between the fixed part 61 and the movable part 62 is adjusted by rotating the threaded rod.

[0043] Because the first mounting part 1 and the second mounting part 2 are made of conductive materials, the first mounting part 1 is electrically connected to the rotating arm 8 of the knife switch stationary contact, and the second mounting part 2 is electrically connected to the rotating arm 9 of the knife switch moving contact. Furthermore, the conductive post 6 is electrically connected to the conductive clamp 5. Thus, the moving contact sequentially passes through the conductive locking claw 7, the first mounting part 1, the conductive clamp 5, the conductive post 6, the second mounting part 2, and the conductive locking claw 7 before connecting to the stationary contact, thereby achieving a current-guiding effect. For example, see attached... Figure 4 The solid line portion in the text.

[0044] During use, the worker inserts the conductive post 6 into the conductive clamp 5 from the ground, such as... Figure 1 As shown, two sets of conductive locking claws 7 are positioned at the top. Then, an insulating support rod is used to lift the first mounting part 1 and the second mounting part 2, raising the fixture so that the two sets of conductive locking claws 7 are respectively hung on the knife switch stationary contact rotating arm 8 and the knife switch moving contact rotating arm 9. The knife switch stationary contact rotating arm 8 and the knife switch moving contact rotating arm 9 are horizontally placed rectangular rods. Since the conductive locking claws 7 have barbs, they can prevent horizontal detachment. Then, an external tool and the external hexagonal of the lower part of the adjusting screw 3 are used to drive the adjusting screw 3 to rotate, so that the conductive locking claws 7 and the movable locking claws 4 cooperate to clamp and fix them on the knife switch stationary contact rotating arm 8 and the knife switch moving contact rotating arm 9.

[0045] Because the first mounting part 1 and the second mounting part 2 are made of conductive materials, the first mounting part 1 is electrically connected to the moving contact, the second mounting part 2 is electrically connected to the stationary contact, and the conductive post 6 is electrically connected to the conductive clamp 5. Thus, the moving contact sequentially passes through the first mounting part 1, the conductive clamp 5, the conductive post 6, and the second mounting part 2 before connecting to the stationary contact, thereby achieving a current-conducting effect. For example, see attached... Figure 4 The solid line portion in the text.

[0046] The first mounting part 1 and the second mounting part 2 are symmetrical to each other except for the structure of the conductive clip 5 and the conductive post 6.

[0047] In emergency situations, it is necessary to separate the moving contact and the stationary contact, for example, by linear movement or rotation to achieve opening and closing. During this process, because the conductive clamp 5 has an opening, the first mounting part 1 rotates with the moving contact and the rotating arm 8 of the knife switch moving contact, and the second mounting part 2 rotates with the stationary contact and the rotating arm 9 of the knife switch stationary and moving contacts. This allows the conductive post 6 of the second mounting part 2 to separate through the opening of the conductive clamp 5, thus separating the conductive post 6 from the conductive clamp 5 (for example, attached). Figure 4 (The dotted line portion).

[0048] The conductive clip 5 is elastic, which facilitates repeated engagement and disengagement of the conductive post 6 and ensures good contact.

[0049] like Figure 6-7As shown, in order to ensure that the positions of the conductive clamp 5 and conductive post 6 of the fixture coincide with the dividing point between the moving contact and the stationary contact of the knife switch, a positioning part 10 is installed on the second mounting part 2. The positioning part 10 is made of an insulating epoxy resin plate, and the shape of the positioning part 10 is adapted to the spacing between the stationary contact rotating arm 8 and the moving contact rotating arm 9 of the knife switch. During installation, the positioning part 10 can be inserted between the stationary contact rotating arm 8 and the moving contact rotating arm 9 of the knife switch to achieve positioning.

[0050] The positioning part 10 has an integral clamping member 101 fixedly connected to its side wall. The clamping member 101 has a U-shaped structure with the opening facing downward. The inner side wall of the clamping member 101 is provided with a guide member 102. The outer side wall of the second mounting part 2 is provided with a guide groove 22. The positioning part 10 slides vertically relative to the second mounting part 2 through the cooperation of the guide member 102 and the guide groove 22. Under the action of their own weight, the clamping member 101 is hung on the second mounting part 2. After the positioning part 10 is inserted between the knife switch stationary contact rotating arm 8 and the knife switch moving contact rotating arm 9 to achieve positioning, the external edge operating rod and the lifting ring 103 are used to drive the clamping member 101 to move vertically upward and detach from the second mounting part 2.

[0051] The positioning part 10 is positioned uniquely when it is installed on the second mounting part 2 by the cooperation of the guide member 102 and the guide groove 22.

[0052] In order to ensure that the first mounting part 1 and the second mounting part 2 remain parallel during the lifting process and to prevent the conductive clamp 5 and the conductive post 6 of the fixture from shifting or loosening, the positioning part 10 connects the first mounting part 1 and the second mounting part 2 into one unit during the lifting process.

[0053] The positioning part 10 includes a horizontal plate 111, two sets of locking pins 114 fixed to the top of the horizontal plate 111, and two sets of locking members 112 fixed to the bottom wall of the horizontal plate 111. In use, the horizontal plate 111 is attached to the bottom wall of the first mounting part 1 and the second mounting part 2. One set of locking pins 114 is inserted vertically upward into the slot 21 of the first mounting part 1, and the other set of locking pins 114 is inserted vertically upward into the slot 21 of the second mounting part 2. The locking pins 114 and the slot 21 are clamped together by friction.

[0054] The structure of the upper end of the insulating operating rod is the same as that of the locking member 112. The upper end of the insulating operating rod is locked and fixed to the locking member 112 by a bolt and nut assembly to form an integral unit 9 (the included angle formed by the insulating operating rod and the locking member 112 can be adjusted). In order to prevent the insulating operating rod and the locking member 112 from shifting after locking, an array of anti-slip parts 113 is provided on the side wall of the locking member 112. The anti-slip parts 113 on the side wall of the locking member 112 and the anti-slip parts 113 at the upper end of the insulating operating rod cooperate to achieve anti-slip.

[0055] The elastic element 115 includes a spring and a ejector pin. The ejector pin slides laterally in a straight line within the corresponding locking post 114. The arc-shaped outer end of the ejector pin is tightly abutted against the inner wall of the locking groove 21 by the elastic force of the spring 115.

[0056] After the first mounting part 1 and the second mounting part 2 are hung on the corresponding knife switch stationary contact rotating arm 8 and knife switch moving contact rotating arm 9 and locked, the horizontal plate 111 is dragged down vertically so that the locking post 114 moves down vertically and disengages from the corresponding locking slot 21, thereby realizing that the flush part 11 is disengaged from the diversion clamp.

[0057] The insulating operating rod drives the first mounting part 1 and the second mounting part 2 to move up and down synchronously by dragging the horizontal plate 111.

[0058] When the contacts of a disconnector overheat and power cannot be cut off, it is necessary to shut down the equipment, and even the substation busbar may need to be shut down for maintenance, which can easily cause a large-scale power outage.

[0059] This fixture and live-line working method:

[0060] 1. Use a cleaning brush to perform a small-scale cleaning of the stationary contact arm 8 and the moving contact arm 9 of the knife switch in advance to remove the oxide layer on the stationary contact arm 8 and the moving contact arm 9 of the knife switch and improve the conductivity.

[0061] 2. Two electricians working on the ground should first tightly connect the conductive post 6 and the conductive clamp 5 to ensure good contact. Then, they should use two insulated operating rods to install the flush part 11, fix the shunt clamp on the flush part 11, and then lift the shunt clamp about 1 meter away from the switch to the same height as or higher than the switch's stationary contact arm 8 and moving contact arm 9. Then, they should move the clamp horizontally onto the switch's stationary contact arm 8 and moving contact arm 9. It is not allowed to lift and install the clamp directly at the switch installation location, as this can easily cause a serious short circuit accident.

[0062] 3. The two insulated operating rods of the shunt clamp are controlled synchronously by two live-line workers. The two insulated operating rods should be kept as parallel and vertical as possible to prevent the conductive post 6 and conductive clamp 5 of the clamp from shifting or loosening, which would result in insufficient contact surface and reduce current carrying capacity. Then, the first mounting part 1 and the second mounting part 2 are hooked onto the knife switch stationary contact rotating arm 8 and the knife switch moving contact rotating arm 9, respectively, after the oxide layer has been removed. The positions of the conductive post 6 and conductive clamp 5 should coincide with the dividing point between the knife switch moving contact and the knife switch stationary contact. They should not be on different horizontal lines. Then, another live-line worker alternately tightens the adjusting screw 3. During the tightening process, the tightening should be done gradually and alternately to avoid uneven force on both sides, which could cause the conductive post 6 and conductive clamp 5 to shift and cause poor contact.

[0063] 4. After the conductive post 6 and conductive clamp 5 of the shunt clamp are locked at both ends, first remove the insulating operating rod of the adjusting screw 3, and then remove the corresponding insulating operating rods of the conductive post 6 and conductive clamp 5.

[0064] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A current shunt clamp for heating and discharging the contacts of a substation switch, comprising a first mounting part (1) and a second mounting part (2) made of conductive material, characterized in that: Both the first mounting part (1) and the second mounting part (2) are provided with clamping mechanisms. The corresponding first mounting part (1) is installed on the rotating arm (9) of the knife switch moving contact and the second mounting part (2) is installed on the rotating arm (8) of the knife switch stationary contact through the clamping mechanisms. The first mounting part (1) is provided with a conductive clamp (5) and the second mounting part (2) is provided with a conductive post (6). The conductive clamp (5) and the conductive post (6) are electrically connected and cooperated. The conductive clamp (5) has an opening on one side for the conductive post (6) to enter and exit. The conductive post (6) follows the opening and closing of the moving contact and the stationary contact of the substation knife switch to enter and exit the opening of the conductive clamp (5). Both the first mounting part (1) and the second mounting part (2) are provided with slots (21), and a horizontal plate (111) is provided that fits against both the first mounting part (1) and the second mounting part (2). At least two sets of locking pins (114) are provided on the horizontal plate (111). The locking pins (114) are inserted into the slots (21) that are detachably engaged from bottom to top. A locking member (112) is installed on the horizontal plate (111). The locking member (112) is used to clamp and fix the operating rod to the outside. An elastic element (115) is installed on the locking post (114), and the elastic element (115) elastically abuts against the inner wall of the corresponding locking groove (21) through its elastic force.

2. The transformer switch contact heating and current shunt clamp as described in claim 1, characterized in that: The conductive clip (5) is a U-shaped structure made of elastic material.

3. A current shunt clamp for heating and energizing the contacts of a transformer switch as described in claim 2, characterized in that: The conductive clip (5) of the U-shaped structure is bent outward at both ends.

4. A current shunt clamp for heating and energizing the contacts of a transformer switch as described in claim 1, characterized in that: The clamping mechanism includes a conductive locking claw (7) fixedly disposed on the upper part of the corresponding first mounting part (1) and second mounting part (2), and an adjusting screw (3) threadedly connected to the corresponding first mounting part (1) and second mounting part (2). One end of the adjusting screw (3) is connected to a movable locking claw (4). Rotating the adjusting screw (3) causes the movable locking claw (4) to move closer to or away from the corresponding conductive locking claw (7).

5. A current shunt clamp for heating and energizing the contacts of a transformer switch as described in claim 4, characterized in that: The conductive post (6) includes a fixed part (61) and a movable part (62). An elastic element is provided between the fixed part (61) and the movable part (62). The movable part (62) is pressed onto the fixed part (61) by a threaded rod.

6. A current shunt clamp for heating and energizing the contacts of a transformer switch as described in claim 4, characterized in that: A positioning part (10) made of insulating material is detachably installed on the first mounting part (1) or the second mounting part (2). The shape of the positioning part (10) is adapted to the spacing between the stationary contact rotating arm (8) and the moving contact rotating arm (9) of the knife switch.

7. A current shunt clamp for heating and energizing the contacts of a transformer switch as described in claim 6, characterized in that: The positioning part (10) is provided with a clamping member (101), the clamping member (101) is provided with a guide member (102), the first mounting part (1) or the second mounting part (2) is provided with a guide groove (22), the guide member (102) and the guide groove (22) are slidably engaged, and the clamping member (101) is provided with a lifting ring (103).

8. A method for using the shunt clamp for heating and energizing the contacts of a substation switch as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Remove the oxide layer on the stationary contact arm (8) and moving contact arm (9) of the disconnector; S2, the conductive post (6) and the conductive clamp (5) are tightly connected; S3. First, fix the flush part (11) on the insulating operating rod, and then install the first mounting part (1) and the second mounting part (2) on the flush part (11); S4. Lift the insulating operating rod and hang the first mounting part (1) and the second mounting part (2) on the corresponding knife switch stationary contact rotating arm (8) and knife switch moving contact rotating arm (9), and position them through the positioning part (10) so that the positions of the conductive clamp (5) and the conductive post (6) coincide with the dividing point between the moving contact and the stationary contact of the knife switch. S5. Use the insulating operating rod to operate the clamping mechanism to fix the corresponding first mounting part (1) and second mounting part (2); S6. Use the insulating operating rod to remove the positioning part (10) and the flush part (11).

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