Insulation device for withstand voltage test of current and voltage transformer
By designing the insulating device's fixing frame, pipe clamps, clamping structure, telescopic tube and other components, the problem of loose fixation of the insulating plate during the transformer's withstand voltage test was solved, and the transformer and busbar were firmly separated and the operation was convenient, ensuring the safety and effectiveness of the withstand voltage test.
Patent Information
- Application Number
- CN202422605564.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-28
AI Technical Summary
In the existing current and voltage transformer withstand voltage test, the insulation board is not firmly fixed, the interruption is not tight, and the isolation is not standardized, resulting in poor operability and affecting the conduct of the withstand voltage test.
An insulation device was designed, including a fixing frame, a pipe clamp, a clamping structure, a telescopic tube, and an insulation cover. The device was fixed to the transformer through the clamping structure. The telescopic tube pushed the insulation cover into the transformer, isolating the inner ring of the transformer from the busbar. The position and stability of the insulation cover were ensured by the adjustment frame and guide groove plate.
It achieves firm fixation and tight disconnection between the transformer and the busbar, ensuring the safety of the withstand voltage test and the convenience of operation. It can withstand the test voltage and meet the needs of the withstand voltage test.
Smart Images
Figure CN223413412U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of current and voltage transformer maintenance, in particular to an insulation device used for current and voltage transformer withstand voltage test. Background Art
[0002] Since current and voltage transformers are typically mounted on slotted or rectangular busbars, while the spacing between them can meet the equipment's operating voltage requirements, it cannot withstand the corresponding withstand voltage test voltage. Therefore, insulating plates are typically added between the transformer and the busbar to increase the withstand voltage and ensure the completion of the withstand voltage test. However, the insulating plates are not only unstable and loose in their isolation, but also lack proper isolation and operability, which hinders the performance of the withstand voltage test. Therefore, it is necessary to design a disconnect device that is easy to operate and can properly isolate the transformer from the corresponding busbar. Utility Model Content
[0003] The main purpose of the utility model is to provide an insulation device for current and voltage transformer withstand voltage test, which solves the problem that the insulation board is not only not firmly fixed and the blocking is not tight, but also the isolation is not standardized, the operability is poor, and the withstand voltage test is affected.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: an insulation device for current and voltage transformer withstand voltage test, a frame matching the transformer end face shape is provided on one side of the fixed frame, the center of the frame is a hollow structure, a plurality of pipe clamps are provided on the outer surface of the frame outer ring, and a plurality of clamping structures are provided on the pipe clamps. The outer ring of the transformer end face is arranged inside the pipe clamp and fixed by the clamping structure, an adjustment frame is provided on the other side of the fixed frame, an insulating cover is provided inside the adjustment frame, and one side of the insulating cover is slidably connected to the adjustment frame by two telescopic tubes. The telescopic tube pushes the insulating cover through the hollow center of the frame into the interior of the transformer and is sleeved on the inner ring of the transformer, isolating the inner ring of the transformer from the busbar.
[0005] In the preferred embodiment, the structure of the clamping structure is: the pressure plate is arranged on the inner ring of the pipe clamp, the first adjusting screw passes through the pipe clamp and is rotatably connected to the pressure plate, the first adjusting screw is threadedly connected to the pipe clamp, and the end of the first adjusting screw is connected to the first rotating handle.
[0006] In a preferred embodiment, a pad is provided on the inner surface of the pressing plate, and the pad is made of rubber material or nylon material.
[0007] In a preferred solution, a plurality of limiting pads are provided on the end face of the fixing frame where the transformer is mounted, and the end face of the transformer rests against the limiting pads.
[0008] In a preferred embodiment, the insulating cover includes an upper cover body and a lower cover body, the upper cover body and the lower cover body are snap-connected to form a whole, and one side of the lower cover body is connected to the telescopic tube.
[0009] In a preferred solution, a fixing nut is provided on the telescopic tube, and the fixing nut passes through the outer sleeve and abuts against the inner tube.
[0010] In a preferred embodiment, the outer ends of the telescopic tubes are connected to a push-pull handle, and the push-pull handle is used to push the insulating cover to move laterally.
[0011] In a preferred embodiment, guide groove plates are further provided on both sides of the interior of the adjustment frame. The guide groove plates are arranged on both sides of the insulation cover, and the insulation cover is slidably connected to the guide groove plates on both sides.
[0012] In the preferred embodiment, the middle bending position of the guide groove plate is rotatably connected to the end of the inclined second adjusting screw, and the other end of the second adjusting screw passes through one side of the adjusting frame and is connected to the second rotating handle.
[0013] The utility model provides an insulation device for current and voltage transformer withstand voltage tests. It can be reliably and conveniently fixed on a slotted or rectangular busbar, and the thickness or withstand voltage of the insulation cover can be selected according to the test voltage to be borne, ensuring that the corresponding withstand voltage is not lower than the corresponding maximum withstand voltage value, ensuring the completion of the corresponding withstand voltage test. The device is firmly fixed, the blocking is strict and standardized, and the operation is convenient. It can effectively block the air gap between the transformer and the corresponding busbar, and can meet the needs of various transformer withstand voltage tests. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0015] Figure 1 This is a structural diagram of the utility model's insulation device installed on a mutual inductor;
[0016] Figure 2 This is a side view of the structure of the utility model with the fixing frame installed in the front of the transformer;
[0017] Figure 3 This is a structural diagram of the installation and disassembly of the fixing frame and mutual inductor of the utility model;
[0018] Figure 4 This is a side view of the structure of the fixed frame and mutual inductor of the utility model after installation and disassembly;
[0019] Figure 5 This is a cross-sectional structural diagram of the interior of the insulation cover of the utility model;
[0020] Figure 6 This is a structural diagram of the installation position of the utility model after the insulation cover is disassembled and the mutual inductor.
[0021] In the figure: fixing frame 1; pipe clamp 101; limiting pad 102; adjustment frame 103; telescopic tube 2; fixing nut 201; push-pull handle 3; insulating cover 4; upper cover body 401; lower cover body 402; mutual inductor 5; busbar 501; clamping structure 6; first rotating handle 601; first adjusting screw 602; pressing plate 603; pad 604; guide groove plate 7; second adjusting screw 8; second rotating handle 801. DETAILED DESCRIPTION
[0022] like Figures 1 to 6 As shown, an insulation device for current and voltage transformer withstand voltage testing is provided. A frame that matches the end face shape of the transformer 5 is provided on one side of the fixed frame 1. The center of the frame is a hollow structure. A plurality of pipe clamps 101 are provided on the outer surface of the frame. The pipe clamps 101 are provided with a plurality of clamping structures 6. The outer ring of the end face of the transformer 5 is arranged inside the pipe clamps 101 and fixed by the clamping structure 6. An adjustment frame 103 is provided on the other side of the fixed frame 1. An insulating cover 4 is provided inside the adjustment frame 103. One side of the insulating cover 4 is slidably connected to the adjustment frame 103 by two telescopic tubes 2. The telescopic tubes 2 push the insulating cover 4 through the hollow center of the frame to penetrate into the interior of the transformer 5 and be sleeved on the inner ring of the transformer, isolating the inner ring of the transformer from the busbar.
[0023] The fixing frame 1 is the primary component of the insulation device. It features a frame with one side matching the shape of the end face of the transformer 5. The center of this frame is hollowed out to allow the telescopic tube 2 and insulating cover 4 to pass smoothly through and into the transformer 5. The outer ring of the fixing frame 1 is equipped with multiple pipe clamps 101, each equipped with a clamping structure 6. These clamps work together to secure the fixing frame 1 to the transformer 5, ensuring a tight connection between the device and the transformer.
[0024] The adjustment frame 103 is located on the other side of the fixed frame 1, and an insulating cover 4 is installed inside it. One side of the insulating cover 4 is slidably connected to the adjustment frame 103 via two telescopic tubes 2. The purpose of this design is to allow the insulating cover 4 to adjust its position as needed. When the telescopic tubes 2 push the insulating cover 4 forward, it passes through the hollow portion in the center of the fixed frame 1, penetrates into the interior of the transformer 5, and tightly fits around the inner ring of the transformer, effectively isolating the inner ring of the transformer from direct contact with the busbar. This is to ensure that during the withstand voltage test, the transformer can withstand voltage values higher than those required by the test, ensuring the safety and effectiveness of the test.
[0025] The entire device installation process begins by attaching one side of the fixing frame 1 to the end face of the transformer 5. The clamping structure 6 on the pipe clamp 101 ensures that the fixing frame 1 is securely fixed to the transformer 5. Next, the insulating cover 4 is pushed accurately into the transformer 5 by operating the telescopic tube 2 to complete the isolation task. This design not only improves the safety of the withstand voltage test but also simplifies the operational steps during test preparation.
[0026] In the preferred embodiment, the structure of the clamping structure 6 is: the pressure plate 603 is arranged on the inner ring of the pipe clamp 101, the first adjusting screw 602 passes through the pipe clamp 101 and is rotatably connected to the pressure plate 603, the first adjusting screw 602 is threadedly connected to the pipe clamp 101, and the end of the first adjusting screw 602 is connected to the first rotating handle 601.
[0027] The clamping structure 6 securely fastens the fixing frame 1 to the end face of the transformer 5, ensuring a stable connection between the entire insulation device and the transformer. Its specific structure includes a pressure plate 603, a first adjustment screw 602, and a first rotating handle 601. The pressure plate 603 is positioned within the inner ring of the pipe clamp 101, while the first adjustment screw 602 passes through the pipe clamp 101 and forms a rotational connection with the pressure plate 603. The first adjustment screw 602 and the pipe clamp 101 are threaded together. One end of the first adjustment screw 602 is connected to the first rotating handle 601. Manually rotating the first rotating handle 601 rotates the first adjustment screw 602, which in turn pushes the pressure plate 603 toward the transformer 5, ultimately pressing the pressure plate 603 against the end face of the transformer 5, achieving a tight fixation between the fixing frame 1 and the transformer 5. This mechanism ensures that the insulation device does not loosen or shift during the withstand voltage test, ensuring the safety and accuracy of the test.
[0028] In a preferred embodiment, a pad 604 is provided on the inner surface of the pressing plate 603 , and the pad 604 is made of rubber material or nylon material.
[0029] The inner surface of the pressure plate 603 is fitted with a backing plate 604, which can be made of rubber or nylon. The backing plate 604 provides a soft contact surface when the pressure plate 603 is pressed against the transformer 5, preventing damage that could otherwise occur from direct contact with hard metal. It also increases friction on the contact surface, making the fixation more secure. In actual use, the first adjustment screw 602 is rotated via the first rotating handle 601, pushing the pressure plate 603 and its inner backing plate 604 toward the transformer 5 until the backing plate 604 is tightly against the end face of the transformer 5, thereby achieving a secure fixation between the fixing frame 1 and the transformer 5.
[0030] In the preferred solution, a plurality of limiting pads 102 are provided on the end surface of the fixing frame 1 where the transformer 5 is mounted, and the end surface of the transformer 5 rests against the limiting pads 102 .
[0031] When the fixed frame 1 is installed on the end face of the transformer 5, a plurality of limiting pads 102 are provided on it. The function of the limiting pads 102 is to ensure that the relative position between the transformer 5 and the fixed frame 1 is fixed when the end face of the transformer 5 rests on them. When in use, first move the fixed frame 1 close to the end face of the transformer 5 so that the end face of the transformer 5 gently rests on the limiting pads 102, and then rotate the first adjusting screw 602 through the first rotating handle 601 in the clamping structure 6 to push the pressure plate 603 and the pad 604 thereon toward the transformer 5 until the transformer 5 is pressed, thereby achieving a stable connection between the fixed frame 1 and the transformer 5. The design of the limiting pads 102 helps to improve the accuracy and stability of the device installation.
[0032] In a preferred embodiment, the insulating cover 4 includes an upper cover body 401 and a lower cover body 402 . The upper cover body 401 and the lower cover body 402 are snap-fitted to form a whole, and one side of the lower cover body 402 is connected to the telescopic tube 2 .
[0033] The insulating cover 4 is composed of an upper cover body 401 and a lower cover body 402, which are connected into a whole by a snap-fit method. Figure 5-6 As shown. One side of the lower cover 402 is connected to the telescopic tube 2, allowing the insulating cover 4 to move under the push of the telescopic tube 2. When the insulating cover 4 passes through the hollow portion in the center of the fixed frame 1, penetrates into the interior of the transformer 5 and is sleeved on the inner ring of the transformer, it can effectively isolate the connection between the inner ring of the transformer and the busbar, ensuring that the transformer can withstand voltage values higher than those required for the test during the withstand voltage test, thereby ensuring the safety of the test. The snap-fit design between the upper cover 401 and the lower cover 402 facilitates the assembly and disassembly of the insulating cover 4.
[0034] In the preferred embodiment, a fixing nut 201 is provided on the telescopic tube 2, and the fixing nut 201 passes through the outer sleeve and rests on the inner tube. Figure 6 As shown, the telescopic tube 2 is used to adjust the position of the insulating cover 4 to ensure that it can be correctly inserted into the transformer 5. The telescopic tube 2 is provided with a fixing nut 201. The fixing nut 201 passes through the outer sleeve and abuts against the inner tube inside, thereby locking the length of the telescopic tube 2. During use, the length of the telescopic tube 2 is first adjusted as needed so that the insulating cover 4 can be accurately inserted into the transformer 5 and isolate the transformer's inner ring from the busbar. After adjusting the position, the fixing nut 201 is tightened so that it abuts against the inner tube, thereby fixing the length of the telescopic tube 2. This ensures that the position of the insulating cover 4 remains unchanged during the withstand voltage test and achieves a good insulation effect.
[0035] In a preferred embodiment, the outer end of the continuous telescopic tube 2 is connected to the push-pull handle 3, and the push-pull handle 3 is used to push the insulating cover 4 to move laterally.
[0036] The outer ends of the two telescopic tubes 2 are connected to push-pull handles 3, designed to facilitate manual lateral movement of the insulating cover 4. During use, the operator can grasp the push-pull handles 3 and apply force to extend or shorten the telescopic tubes 2, thereby driving the insulating cover 4 through the hollowed-out portion at the center of the fixed frame 1, deep into the interior of the transformer 5, and precisely fitting over the transformer's inner ring, effectively isolating the transformer's inner ring from the busbar. This design not only improves operational convenience but also ensures accurate positioning of the insulating cover 4, thereby enhancing the safety and reliability of the withstand voltage test.
[0037] In a preferred embodiment, guide groove plates 7 are further provided on both sides of the interior of the adjustment frame 103 . The guide groove plates 7 are provided on both sides of the insulation cover 4 . The insulation cover 4 is slidably connected to the guide groove plates 7 on both sides.
[0038] Guide groove plates 7 are provided on both sides of the interior of the adjustment frame 103. These guide groove plates 7 are located on both sides of the insulating cover 4 and form a sliding connection with the insulating cover 4. The function of the guide groove plates 7 is to provide stable support for the insulating cover 4 and to serve as a sliding guide to ensure that the insulating cover 4 can move smoothly and accurately along the predetermined path. When the telescopic tube 2 is pushed by the push-pull handle 3, the insulating cover 4 will, under the guidance of the guide groove plates 7, pass through the hollow part in the center of the fixed frame 1, penetrate into the interior of the transformer 5 and be sleeved on the inner ring of the transformer, thereby effectively isolating the connection between the inner ring of the transformer and the busbar. The design of the guide groove plates 7 not only enhances the overall stability of the device, but also improves the convenience and accuracy of operation.
[0039] In the preferred embodiment, the middle bending position of the guide groove plate 7 is rotatably connected to the end of the inclined second adjusting screw 8, and the other end of the second adjusting screw 8 passes through one side of the adjusting frame 103 and is connected to the second rotating handle 801.
[0040] The bent position in the middle of the guide groove plate 7 is rotatably connected to the end of the inclined second adjusting screw 8, and the other end of the second adjusting screw 8 passes through one side of the adjustment frame 103 and is connected to the second rotating handle 801. This design allows the guide groove plate 7 to be adjusted in position as needed.
[0041] When the second rotating handle 801 is rotated, the second adjusting screw 8 rotates accordingly, causing the guide groove plate 7 to move away from or closer to the insulating cover 4. If the insulating cover 4 needs to be removed, the second rotating handle 801 can be rotated to move the guide groove plate 7 away from the insulating cover 4, thereby conveniently removing the insulating cover 4. In addition, when it is necessary to replace the insulating cover 4 of a different size, such as replacing a larger insulating cover 4, the position of the guide groove plate 7 can also be adjusted by adjusting the second adjusting screw 8 to adapt to the size requirements of the new insulating cover 4, ensuring that it can be effectively supported and guided. This design improves the flexibility and adaptability of the device.
[0042] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.
Claims
1. An insulation device for current and voltage transformer withstand voltage testing, characterized by: A frame matching the outer shape of the end face of the mutual inductor (5) is provided on one side of the fixed frame (1), the center of the frame is a hollow structure, a plurality of pipe clamps (101) are provided on the outer surface of the frame, a plurality of clamping structures (6) are provided on the pipe clamps (101), the outer ring of the end face of the mutual inductor (5) is arranged inside the pipe clamps (101) and fixed by the clamping structure (6), an adjustment frame (103) is provided on the other side of the fixed frame (1), an insulating cover (4) is provided inside the adjustment frame (103), one side of the insulating cover (4) is slidably connected to the adjustment frame (103) by two telescopic tubes (2), the telescopic tubes (2) push the insulating cover (4) through the hollow center of the frame, deep into the interior of the mutual inductor (5) and sleeved on the inner ring of the mutual inductor, isolating the inner ring of the mutual inductor from the busbar.
2. The insulation device for current and voltage transformer withstand voltage test according to claim 1, characterized in that: The structure of the clamping structure (6) is as follows: a pressure plate (603) is arranged on the inner ring of the pipe clamp (101), a first adjusting screw (602) passes through the pipe clamp (101) and is rotatably connected to the pressure plate (603), the first adjusting screw (602) is threadedly connected to the pipe clamp (101), and an end of the first adjusting screw (602) is connected to the first rotating handle (601).
3. The insulation device for current and voltage transformer withstand voltage test according to claim 2, characterized in that: A backing plate (604) is provided on the inner surface of the pressing plate (603), and the backing plate (604) is made of rubber material or nylon material.
4. The insulation device for current and voltage transformer withstand voltage test according to claim 1, characterized in that: The end face of the fixed frame (1) for mounting the mutual inductor (5) is provided with a plurality of limiting pads (102), and the end face of the mutual inductor (5) rests against the limiting pads (102).
5. The insulation device for current and voltage transformer withstand voltage test according to claim 1, characterized in that: The insulating cover (4) comprises an upper cover body (401) and a lower cover body (402). The upper cover body (401) and the lower cover body (402) are connected to form a whole by snap-fitting, and one side of the lower cover body (402) is connected to the telescopic tube (2).
6. The insulation device for current and voltage transformer withstand voltage test according to claim 5, characterized in that: A fixing nut (201) is provided on the telescopic tube (2), and the fixing nut (201) passes through the outer sleeve and rests on the inner tube.
7. The insulation device for current and voltage transformer withstand voltage test according to claim 5, characterized in that: The outer end of the continuous telescopic tube (2) is connected to a push-pull handle (3), and the push-pull handle (3) is used to push the insulating cover (4) to move laterally.
8. The insulation device for current and voltage transformer withstand voltage test according to claim 1, characterized in that: Guide groove plates (7) are further provided on both sides of the interior of the adjustment frame (103). The guide groove plates (7) are arranged on both sides of the insulation cover (4). The insulation cover (4) is slidably connected to the guide groove plates (7) on both sides.
9. The insulation device for current and voltage transformer withstand voltage test according to claim 8, characterized in that: The middle bending position of the guide groove plate (7) is rotatably connected to the end of the second adjusting screw (8) which is arranged obliquely, and the other end of the second adjusting screw (8) passes through one side of the adjusting frame (103) and is connected to the second rotating handle (801).