Short-circuit grounding wire clamp for transformer insulation characteristic test
By designing the short-circuit grounding clamp of the inverted U-shaped short-circuit clamp main frame and limit torsion spring structure, the problems of inconvenient use and falling off of traditional short-circuit clamps are solved, and efficient and safe transformer insulation characteristics tests are achieved.
Patent Information
- Application Number
- CN202421285990.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-06-06
AI Technical Summary
Traditional short-circuit wiring clamps are inconvenient to use during the insulation characteristics test of transformers, easily fall off, and take a long time to operate, which poses safety hazards.
A short-circuit grounding clamp including a short-circuit clamp main frame, an insulating rod insertion handle, a copper sheet slide and a short-circuit clamp assembly is designed. It adopts an inverted U-shaped structure, combining a limit torsion spring and a contact copper sheet to achieve tight fit and multi-direction angle adjustment.
It improves the efficiency and safety of short-circuit operations, ensures that the wire clamps are closely fitted with the high-voltage sleeve, not easy to fall off, adapt to various environmental angle adjustments, and is easy to carry.
Smart Images
Figure CN223139613U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer high - voltage insulation characteristic tests, and particularly relates to a short - circuit grounding wire clamp for transformer insulation characteristic tests. Background Art
[0002] In the power industry, professionals such as maintenance and high - voltage testing often need to conduct transformer insulation characteristic tests, mainly for transformer insulation resistance absorption ratio, polarization index testing, withstand voltage testing, no - load and load tests, etc. Operators need to short - circuit the three phases of A, B, and C on the high, medium, and low sides of the transformer respectively.
[0003] Traditional short - circuit wiring often uses slot - type wire clamps, which are time - consuming and laborious when connecting and hanging. The position of the transformer high - voltage side bushing is high. When wiring, operators either need to climb onto the transformer high - voltage side bushing or use a boom truck to move to the high - voltage side bushing. It is often affected by the environmental position, and it is difficult to master the angle of the insulating rod. The wire clamp is particularly difficult to tighten, easy to fall off, and not convenient to remove, and it is easy to smash the transformer insulating porcelain bottle, bringing potential risks to operators and equipment. Summary of the Utility Model
[0004] The utility model aims to solve the problems of inconvenient use, easy falling off, and long operation time of the existing transformer short - circuit device, and further proposes a short - circuit grounding wire clamp for transformer insulation characteristic tests.
[0005] The technical solution adopted by the utility model to solve the above - mentioned technical problems is as follows:
[0006] A short - circuit grounding wire clamp for transformer insulation characteristic tests includes a short - circuit wire clamp main frame, an insulating rod insertion handle, a copper sheet slideway, a short - circuit clamp assembly, and a wiring assembly. The shape of the short - circuit wire clamp main frame is an inverted U - shape. The insulating rod insertion handle is fixedly connected to one side outside the short - circuit wire clamp main frame. The wiring assembly is fixedly connected to the other side outside the short - circuit wire clamp main frame. The copper sheet slideway is fixedly connected to the upper part inside the short - circuit wire clamp main frame. The short - circuit clamp assembly is arranged inside the short - circuit wire clamp main frame. The short - circuit clamp assembly includes two short - circuit clamps arranged opposite to each other along the width direction of the short - circuit wire clamp main frame. Each short - circuit clamp includes a short - circuit fixing frame, a limiting torsion spring, and a contact - type copper sheet. The short - circuit fixing frame is fixedly connected to the inner side of the lower end of the side wall of the short - circuit wire clamp main frame. The lower end of the contact - type copper sheet is hinged to the short - circuit fixing frame. The upper end of the contact - type copper sheet is inserted into the copper sheet slideway and is slidably connected to the copper sheet slideway. The limiting torsion spring is arranged between the inner end face of the side wall of the short - circuit wire clamp main frame and the outer side wall of the contact - type copper sheet.
[0007] Furthermore, the inner side wall of the contact - type copper sheet is an inward - concave arc - shaped surface.
[0008] Furthermore, a copper sheet bolt is provided at the lower end of the short - circuit fixing bracket. The end of the copper sheet bolt is threadedly connected with a copper sheet nut, and the copper sheet nut is arranged outside the short - circuit fixing bracket. The lower end of the contact copper sheet is rotatably connected to the middle part of the copper sheet bolt.
[0009] Furthermore, a torsion spring bolt is provided at the upper end of the short - circuit fixing bracket. The end of the torsion spring bolt is threadedly connected with a torsion spring nut, and the torsion spring nut is arranged outside the short - circuit fixing bracket. The limiting torsion spring is sleeved on the middle part of the torsion spring bolt. One side foot of the limiting torsion spring is arranged on the inner end face of the side wall of the short - circuit clamp main frame, and the other side foot of the limiting torsion spring is arranged on the outer side wall of the contact copper sheet.
[0010] Furthermore, the shapes of both side feet of the limiting torsion spring are L - shaped.
[0011] Furthermore, the wiring assembly includes a wiring bolt, a wiring wing nut and two wiring washers. The wiring bolt is vertically fixed on the side wall of the short - circuit clamp main frame. The wiring wing nut is threadedly connected to the end of the wiring bolt. The two wiring washers are arranged side by side on the wiring bolt and are arranged inside the wiring wing nut.
[0012] Furthermore, the insulating rod head insertion handle is inclined downward from the fixed end to the insertion end.
[0013] Furthermore, an insulating rod head insertion handle bolt is provided at the upper end of the insulating rod head insertion handle. The insulating rod head insertion handle bolt vertically passes through the side wall of the short - circuit clamp main frame and the upper end of the insulating rod head insertion handle. The end of the insulating rod head insertion handle bolt is threadedly connected with an insulating rod head insertion handle nut, and the insulating rod head insertion handle nut is arranged outside the upper end of the insulating rod head insertion handle.
[0014] Furthermore, an insulating rod head insertion hole is provided at the lower end of the insulating rod head insertion handle.
[0015] Furthermore, limiting baffles are provided on both sides of the copper sheet slideway, and the upper end of the contact copper sheet is arranged between the two limiting baffles.
[0016] The beneficial effects of the present utility model compared with the prior art are as follows:
[0017] 1. The present utility model provides a short - circuit grounding wire clamp for transformer insulation characteristic tests, which can quickly carry out the short - circuit operation process and improve the work efficiency of operators.
[0018] 2. The short - circuit grounding wire clamp of the present utility model can be closely attached to the high - voltage bushing and is not easy to fall off.
[0019] 3. The short - circuit grounding wire clamp of the present utility model is convenient for operators to carry, and is small and handy.
[0020] 4. The short - circuit grounding wire clamp of the present utility model is not affected by the on - site environment and can cooperate with an insulating rod to adjust the angle for operation in multiple directions. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 FIG. is a schematic structural diagram of a short - circuit grounding wire clamp for transformer insulation characteristic test of the present utility model.
[0022] Figure 2 is Figure 1 the front view of
[0023] Figure 3 is Figure 1 the top view of
[0024] Figure 4 is Figure 1 the bottom view of
[0025] Figure 5 is Figure 1 the right view of
[0026] In the figure: 11, main frame of the short - circuit wire clamp; 21, short - circuit fixing frame; 31, insertion handle of the insulating rod head; 12, copper sheet slideway; 13, copper sheet slideway bolt; 14, copper sheet slideway nut; 15, connection bolt; 16, connection wing nut; 17, connection gasket; 22, copper sheet bolt; 23, copper sheet nut; 24, torsion spring bolt; 25, torsion spring nut; 26, limit torsion spring; 27, contact copper sheet; 32, insulating rod head insertion handle bolt; 33, insulating rod head insertion handle nut; 34, insulating rod head insertion hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the following further details the utility model in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0028] DETAILED DESCRIPTION OF THE EMBODIMENT 1: In combination with Figures 1 to 5Description of this embodiment: The short - circuit grounding wire clamp for the insulation characteristic test of a transformer described in this embodiment includes a short - circuit clamp main frame 11, an insulating rod insertion handle 31, a copper - sheet slideway 12, a short - circuit clamp assembly, and a wiring assembly. The shape of the short - circuit clamp main frame 11 is an inverted U - shape. The insulating rod insertion handle 31 is fixedly connected to one side outside the short - circuit clamp main frame 11. The wiring assembly is fixedly connected to the other side outside the short - circuit clamp main frame 11. The copper - sheet slideway 12 is fixedly connected to the upper part inside the short - circuit clamp main frame 11. The short - circuit clamp assembly is arranged inside the short - circuit clamp main frame 11. The short - circuit clamp assembly includes two short - circuit clamps arranged oppositely along the width direction of the short - circuit clamp main frame 11. Each short - circuit clamp includes a short - circuit fixing frame 21, a limiting torsion spring 26, and a contact - type copper sheet 27. The short - circuit fixing frame 21 is fixedly connected to the inner side of the lower end of the side wall of the short - circuit clamp main frame 11. The lower end of the contact - type copper sheet 27 is hinged to the short - circuit fixing frame 21. The upper end of the contact - type copper sheet 27 is inserted into the copper - sheet slideway 12 and is slidably connected to the copper - sheet slideway 12. The limiting torsion spring 26 is arranged between the inner end face of the side wall of the short - circuit clamp main frame 11 and the outer side wall of the contact - type copper sheet 27.
[0029] In this embodiment, an insulating rod is inserted into the insulating rod head insertion handle 31 for holding by hand. The wiring assembly is used to connect the lead - out wire, and the short - circuit clamp assembly is used to clamp the bushing on the high - voltage side of the transformer. Conductivity exists between the lead - out wire and the bushing on the high - voltage side of the transformer, realizing the short - circuit of the bushing on the high - voltage side of the transformer.
[0030] The bushing on the high - voltage side of the transformer is inserted between the two contact - type copper sheets 27. The two limiting torsion springs 26 make the two contact - type copper sheets 27 closely fit the bushing on the high - voltage side of the transformer. The two contact - type copper sheets 27 can slide within the copper - sheet slideway 12. The copper - sheet slideway 12 is fixedly connected to the upper part inside the short - circuit clamp main frame 11 through a copper - sheet slideway bolt 13 and a copper - sheet slideway nut 14.
[0031] The short - circuit clamp main frame 11, the short - circuit fixing frame 21, and the insulating rod head insertion handle 31 are made of alloy material, with wear - resistant, corrosion - resistant, and strong antioxidant capabilities. The outer wall of the short - circuit clamp main frame 11 has been polished.
[0032] Specific embodiment two: Figures 1 to 5 Description of this embodiment: The inner side wall of the contact - type copper sheet 27 described in this embodiment is a concave arc - shaped surface. The technical features not disclosed in this embodiment are the same as those in the first specific embodiment.
[0033] Since the end of the bushing on the high - voltage side of the transformer is column - shaped, such a design facilitates the contact - type copper sheet 27 to clamp the end of the bushing on the high - voltage side of the transformer in the radial direction. In this embodiment, the contact - type copper sheet 27 can be clamped on the end of the bushing on the high - voltage side of the transformer.
[0034] Specific embodiment three: Figures 1 to 5Regarding this embodiment, a copper sheet bolt 22 is provided at the lower end of the short - circuit fixing bracket 21. A copper sheet nut 23 is thread - connected to the end of the copper sheet bolt 22, and the copper sheet nut 23 is arranged outside the short - circuit fixing bracket 21. The lower end of the contact copper sheet 27 is rotatably connected to the middle part of the copper sheet bolt 22. The technical features not disclosed in this embodiment are the same as those in the first specific embodiment.
[0035] Such a design is to achieve the hinge connection between the contact copper sheet 27 and the short - circuit fixing bracket 21. The transformer high - voltage side bushing enters from the lower ends of the two contact copper sheets 27. When clamping the transformer high - voltage side bushing, the upper ends of the contact copper sheets 27 gradually open, and the inner side walls of the contact copper sheets 27 are pressed against the transformer high - voltage side bushing under the tension of the limiting torsion spring 26, thereby achieving the clamping of the transformer high - voltage side bushing.
[0036] Specific embodiment four: Figures 1 to 5 Regarding this embodiment, a torsion spring bolt 24 is provided at the upper end of the short - circuit fixing bracket 21. A torsion spring nut 25 is thread - connected to the end of the torsion spring bolt 24, and the torsion spring nut 25 is arranged outside the short - circuit fixing bracket 21. The limiting torsion spring 26 is sleeved on the middle part of the torsion spring bolt 24. One side foot of the limiting torsion spring 26 is arranged on the inner end face of the side wall of the short - circuit clamp main frame 11, and the other side foot of the limiting torsion spring 26 is arranged on the outer side wall of the contact copper sheet 27. The technical features not disclosed in this embodiment are the same as those in the third specific embodiment.
[0037] Such a design is to achieve the positioning and limiting of the limiting torsion spring 26.
[0038] Specific embodiment five: Figures 1 to 5 Regarding this embodiment, the shapes of the two side feet of the limiting torsion spring 26 are both L - shaped. The technical features not disclosed in this embodiment are the same as those in the fourth specific embodiment.
[0039] Such a design is to increase the contact area of the feet of the limiting torsion spring 26, avoid the slipping and deformation of the feet of the limiting torsion spring 26, ensure sufficient tension, and further ensure that the contact copper sheet 27 can be pressed against the transformer high - voltage side bushing.
[0040] Specific embodiment six: Figures 1 to 5 Regarding this embodiment, the wiring assembly includes a wiring bolt 15, a wiring wing nut 16 and two wiring washers 17. The wiring bolt 15 is vertically fixed on the side wall of the short - circuit clamp main frame 11. The wiring wing nut 16 is thread - connected to the end of the wiring bolt 15. The two wiring washers 17 are arranged side - by - side on the wiring bolt 15 and are arranged inside the wiring wing nut 16. The technical features not disclosed in this embodiment are the same as those in the first specific embodiment.
[0041] The wiring wing nut 16 can set the distance between the two wiring gaskets 17 through rotation adjustment, facilitating the access of the lead wire.
[0042] Specific Embodiment Seven: In combination with Figures 1 to 5 To illustrate this embodiment, the insulating rod head insertion handle 31 of this embodiment is inclined downward from the fixed end to the insertion end. The technical features not disclosed in this embodiment are the same as those in Specific Embodiment One.
[0043] Specific Embodiment Eight: In combination with Figures 1 to 5 To illustrate this embodiment, the upper end of the insulating rod head insertion handle 31 of this embodiment is provided with an insulating rod head insertion handle bolt 32. The insulating rod head insertion handle bolt 32 vertically passes through the side wall of the short circuit clamp main frame 11 and the upper end of the insulating rod head insertion handle 31. The end of the insulating rod head insertion handle bolt 32 is threadedly connected with an insulating rod head insertion handle nut 33. The insulating rod head insertion handle nut 33 is arranged outside the upper end of the insulating rod head insertion handle 31. The technical features not disclosed in this embodiment are the same as those in Specific Embodiment Seven.
[0044] Specific Embodiment Nine: In combination with Figures 1 to 5 To illustrate this embodiment, the lower end of the insulating rod head insertion handle 31 of this embodiment is provided with an insulating rod head insertion hole 34. The technical features not disclosed in this embodiment are the same as those in Specific Embodiment Seven.
[0045] The insulating rod head is inserted into the insulating rod head insertion hole 34 to be connected with the insulating rod head insertion handle 31.
[0046] Specific Embodiment Ten: In combination with Figures 1 to 5 To illustrate this embodiment, limiting baffles are provided on both sides of the copper sheet slideway 12. The upper end of the contact copper sheet 27 is arranged between the two limiting baffles. The technical features not disclosed in this embodiment are the same as those in Specific Embodiment One.
[0047] Such a design can effectively achieve the limit during the sliding process of the contact copper sheet 27, ensuring that the upper end of the contact copper sheet 27 maintains a relative state during the opening and closing sliding processes.
[0048] Working Principle
[0049] By rotating the wiring wing nut 16, the distance between the two wiring gaskets 17 can be adjusted to connect the lead wire and lock it. The insulating rod head is connected to the insulating rod head insertion hole 34, and the insulating rod is rotated and locked. The two contact copper sheets 27 are inserted into the transformer high-voltage side bushing. The two limiting torsion springs 26 drive the two contact copper sheets 27 to fit the transformer high-voltage side bushing, so that it will not fall off, and the short-circuit work is completed.
[0050] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A short - circuit grounding wire clamp for transformer insulation characteristic tests, characterized in that: It includes a short-circuit line clamp main frame (11), an insulating rod insertion handle (31), a copper sheet slideway (12), a short-circuit clamp assembly and a wiring assembly. The shape of the short-circuit line clamp main frame (11) is an inverted U shape. The insulating rod insertion handle (31) is fixedly connected to one side outside the short-circuit line clamp main frame (11). The wiring assembly is fixedly connected to the other side outside the short-circuit line clamp main frame (11). The copper sheet slideway (12) is fixedly connected to the upper part inside the short-circuit line clamp main frame (11). The short-circuit clamp assembly is arranged inside the short-circuit line clamp main frame (11). The short-circuit clamp assembly includes two short-circuit clamps arranged oppositely along the width direction of the short-circuit line clamp main frame (11). The short-circuit clamp includes a short-circuit fixing frame (21), a limiting torsion spring (26) and a contact copper sheet (27). The short-circuit fixing frame (21) is fixedly connected to the inside of the lower end of the side wall of the short-circuit line clamp main frame (11). The lower end of the contact copper sheet (27) is hinged to the short-circuit fixing frame (21). The upper end of the contact copper sheet (27) is inserted on the copper sheet slideway (12) and is slidably connected to the copper sheet slideway (12). The limiting torsion spring (26) is arranged between the inner end face of the side wall of the short-circuit line clamp main frame (11) and the outer side wall of the contact copper sheet (27).
2. The short - circuit grounding wire clamp for transformer insulation characteristic test according to claim 1, characterized in that: The inner side wall of the contact copper sheet (27) is a concave arc surface.
3. The short - circuit grounding wire clamp for the insulation characteristic test of a transformer according to claim 1, characterized in that: A copper sheet bolt (22) is provided at the lower end of the short-circuit fixing frame (21). The end of the copper sheet bolt (22) is threadedly connected with a copper sheet nut (23). The copper sheet nut (23) is arranged outside the short-circuit fixing frame (21). The lower end of the contact copper sheet (27) is rotatably connected to the middle of the copper sheet bolt (22).
4. The short - circuit grounding wire clamp for the insulation characteristic test of a transformer according to claim 3, characterized in that: A torsion spring bolt (24) is provided at the upper end of the short-circuit fixing frame (21). The end of the torsion spring bolt (24) is threadedly connected with a torsion spring nut (25). The torsion spring nut (25) is arranged outside the short-circuit fixing frame (21). The limiting torsion spring (26) is sleeved on the middle of the torsion spring bolt (24). One leg of the limiting torsion spring (26) is arranged on the inner end face of the side wall of the short-circuit line clamp main frame (11). The other leg of the limiting torsion spring (26) is arranged on the outer side wall of the contact copper sheet (27).
5. The short-circuit grounding clamp for transformer insulation characteristic test according to claim 4, characterized in that: The shapes of both legs of the limiting torsion spring (26) are L-shaped.
6. The short-circuit grounding wire clamp for the insulation characteristic test of a transformer according to claim 1, wherein: The wiring assembly includes a wiring bolt (15), a wiring wing nut (16) and two wiring washers (17). The wiring bolt (15) is vertically fixedly connected to the side wall of the short-circuit line clamp main frame (11). The wiring wing nut (16) is threadedly connected to the end of the wiring bolt (15). The two wiring washers (17) are arranged side by side on the wiring bolt (15) and are arranged inside the wiring wing nut (16).
7. The short-circuit grounding wire clamp for the insulation characteristic test of a transformer according to claim 1, characterized in that: The insulating rod head insertion handle (31) is inclined downward from the fixed end to the insertion end.
8. The short - circuit grounding wire clamp for the insulation characteristic test of a transformer according to claim 7, wherein: An insulating rod head insertion handle bolt (32) is provided at the upper end of the insulating rod head insertion handle (31). The insulating rod head insertion handle bolt (32) vertically passes through the side wall of the short-circuit line clamp main frame (11) and the upper end of the insulating rod head insertion handle (31). The end of the insulating rod head insertion handle bolt (32) is threadedly connected with an insulating rod head insertion handle nut (33). The insulating rod head insertion handle nut (33) is arranged outside the upper end of the insulating rod head insertion handle (31).
9. The short - circuit grounding wire clamp for transformer insulation characteristic test according to claim 7, characterized in that: The lower end of the insulating rod head insertion handle (31) is provided with an insulating rod head insertion hole (34).
10. The short - circuit grounding clamp for the insulation characteristic test of a transformer according to claim 1, characterized in that: Both sides of the copper sheet slideway (12) are provided with limiting baffles, and the upper end of the contact copper sheet (27) is arranged between the two limiting baffles.