A high-voltage transformer anti-overload protection device

Abstract

This utility model discloses an overload protection device for high-voltage instrument transformers, belonging to the field of high-voltage instrument transformers. The device includes a fuse body, with sealing caps threaded to both ends. Connecting pieces are mounted on both sealing caps, connecting to the terminals of the high-voltage instrument transformer. An installation mechanism is provided on the outside of the fuse body, with an installation plate on the mechanism. A sleeve is fixed on the installation plate, and a torsion spring is connected inside the sleeve. This utility model solves the problem of insufficient shielding protection for existing fuse terminals during circuit breakers. By employing a torsion spring linkage structure, this utility model automatically pushes the protective sleeve to shield the terminals during a circuit break, effectively improving the safety performance of the equipment. This design triggers the protection mechanism instantly upon fuse operation, quickly isolating exposed live terminals and preventing the risk of electric shock caused by high-voltage arc leakage.

Description

Technical Field

[0001] This utility model relates to the field of high voltage transformers, specifically to a high voltage transformer overload protection device. Background Technology

[0002] The high-voltage transformer overload protection device is an electrical protection device used to prevent transformers from being damaged by overload, short circuit or abnormal current. The device monitors the current and voltage on the secondary side of the transformer in real time. When an overload or short circuit fault is detected, it quickly triggers the built-in or external high-voltage fuse to cut off the circuit, avoiding overheating, insulation breakdown or magnetic saturation of the transformer. The fuse serves as backup protection, providing reliable physical fuse protection when electronic protection fails, thus enhancing system safety. Existing high-voltage transformer overload protection fuses lack circuit breaking protection structures for the terminals during use. In the event of a circuit break, the terminals cannot be shielded for protection. When the fuse blows due to overload or short circuit, there is a risk of electric shock or short circuit. At the same time, the lack of shielding structure may also allow external dust, moisture or foreign objects to enter, affecting the insulation performance of the equipment and even causing secondary faults, which is not conducive to the safe and stable operation of the power system.

[0003] In summary, in order to improve the safety and reliability of overload protection devices for high-voltage transformers, it is necessary to address the problem of the lack of shielding protection at the terminals of existing fuses when the circuit is broken, so that the equipment can effectively isolate live parts after the fuse trips, preventing arc leakage and foreign object intrusion. Summary of the Invention

[0004] The purpose of this utility model is to provide an overload protection device for high voltage transformers. By adopting a torsion spring linkage structure, the device can push the protective sleeve to shield and protect the wiring terminals when a circuit break occurs, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-voltage transformer overload protection device, comprising a fuse body, both ends of which are threadedly connected to sealing caps, and both sealing caps are equipped with connecting plates, which are connected to the terminals of the high-voltage transformer. An installation mechanism is provided on the outer side of the fuse body, and an installation plate is provided on the installation mechanism. A sleeve is fixed on the installation plate, and a torsion spring is connected inside the sleeve. A clamp is rotatably connected to the torsion spring. A protective sleeve is provided on the outer side of the connecting plate, and a guide assembly is provided on the protective sleeve. The protective sleeve is slidably connected to the connecting plate through the guide assembly. A connecting rod is fixed between the two protective sleeves, and the clamp is fitted with the connecting rod. A positioning mechanism is provided on both sealing caps to assist the movement of the connecting rod. A suspension rope is connected to the fuse wire of the fuse body, and the end of the suspension rope is connected to the torsion spring. A limiting assembly for positioning the suspension rope is provided on the upper sealing cap.

[0006] Preferably, the installation mechanism includes a socket assembly disposed on the outside of the fuse body and a locking assembly disposed on the socket assembly. The socket assembly is used to position the mounting plate, and the locking assembly is used to fasten the socket assembly.

[0007] Preferably, the socket assembly includes two clamps disposed on the outside of the fuse body, a hinge shaft mounted on the clamps, and an anti-slip pad disposed on the inside of the clamps, with the two clamps rotatably connected by the hinge shaft.

[0008] Preferably, the locking assembly includes a positioning shaft mounted on one side of the clamp, a collar rotatably connected to the outside of the positioning shaft, a screw fixed on the collar, and a knob disposed on the outside of the screw, the knob being threadedly connected to the screw.

[0009] Preferably, the guide assembly includes two sliders fixed inside the protective sleeve and two grooves formed outside the connecting piece, with the sliders slidably connected to the grooves.

[0010] Preferably, the limiting assembly includes a support fixed on the upper sealing cover, a rotating shaft rotatably connected to the support, and a limiting roller fixed on the outside of the rotating shaft, with the suspension rope in contact with the outer surface of the limiting roller.

[0011] Preferably, the positioning mechanism includes a support assembly disposed on the upper sealing cover and a sliding assembly disposed on the support assembly. The support assembly is used to mount the sliding assembly, and the sliding assembly is used to assist the movement of the connecting rod.

[0012] Preferably, the support assembly includes a fixing plate fixed to the upper sealing cover, a support rod fixed to the fixing plate, and a U-shaped seat mounted on the support rod, with the connecting rod passing through the slot of the U-shaped seat.

[0013] Preferably, the sliding assembly includes a mounting groove formed on the U-shaped seat and a plurality of rollers rotatably connected inside the mounting groove, the outer surface of the rollers being in contact with the connecting rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention employs a torsion spring linkage structure, which automatically pushes the protective sleeve to shield the terminals in the event of a circuit breaker, effectively improving the safety performance of the equipment. This design triggers the protection mechanism the instant the fuse trips, quickly isolating exposed live terminals and preventing the risk of electric shock caused by high-voltage arc leakage. The shielding structure not only blocks the intrusion of external dust, moisture, and other contaminants but also prevents maintenance personnel from accidentally touching live parts. Furthermore, this automatic protection function requires no additional power source, has a fast response speed, and high reliability, significantly reducing the probability of secondary short circuits and insulation faults. The shielding effect of the protective sleeve also extends the equipment maintenance cycle, enabling the entire protection device to maintain stable protection performance even in harsh environments, providing more comprehensive protection for the safe operation of the power system. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the installation mechanism of this utility model; Figure 3 This is a three-dimensional structural diagram of the torsion spring of this utility model; Figure 4 This is a three-dimensional structural diagram of the protective sleeve of this utility model; Figure 5 This is a schematic diagram of the three-dimensional structure of the limiting roller of this utility model.

[0016] In the diagram: 1. Fuse body; 2. Sealing cover; 3. Connecting piece; 41. Clamp; 42. Hinge shaft; 43. Anti-slip pad; 44. Positioning shaft; 45. Collar; 46. Screw; 47. Knob; 5. Mounting plate; 6. Sleeve; 7. Torsion spring; 8. Clamp; 9. Protective sleeve; 10. Connecting rod; 111. Sliding block; 121. Support; 122. Rotating shaft; 123. Limiting roller; 131. Fixing plate; 132. Support rod; 133. U-shaped seat; 134. Mounting groove; 135. Roller. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments.

[0018] Refer to the instruction manual appendix Figures 1 to 5 A high-voltage transformer overload protection device includes a fuse body 1, with sealing caps 2 threaded to both ends of the fuse body 1. Connecting pieces 3 are installed on both sealing caps 2, and the connecting pieces 3 are connected to the terminals of the high-voltage transformer. An installation mechanism is provided on the outside of the fuse body 1, with an installation plate 5 on the installation mechanism. A sleeve 6 is fixed on the installation plate 5, and a torsion spring 7 is connected inside the sleeve 6. A clamp 8 is rotatably connected to the torsion spring 7. A protective sleeve 9 is provided on the outside of the connecting piece 3, and a guide assembly is provided on the protective sleeve 9. The protective sleeve 9 is slidably connected to the connecting piece 3 through the guide assembly. A connecting rod 10 is fixed between the two protective sleeves 9, and the clamp 8 fits against the connecting rod 10. A positioning mechanism is provided on both sealing caps 2 to assist the movement of the connecting rod 10. A suspension rope is connected to the fuse wire of the fuse body 1, and the end of the suspension rope is connected to the torsion spring 7. A limiting assembly for positioning the suspension rope is provided on the upper sealing cap 2.

[0019] It should be noted that when the fuse body 1 melts due to overload or short circuit, the suspension rope is no longer pulled by the fuse wire, so the torsion spring 7 releases its elastic potential energy to reset. When the torsion spring 7 rotates, it pulls the clamp 8, and the clamp 8 fits against the connecting rod 10, thereby driving the connecting rod 10 to move. The connecting rod 10 connects two protective sleeves 9, which slide on the connecting piece 3 through the guide assembly, so that the protective sleeves 9 automatically cover the terminal, achieving immediate shielding protection. This process effectively isolates live parts, prevents the risk of electric shock caused by high voltage arc leakage, blocks the intrusion of contaminants such as dust and moisture, avoids secondary short circuits or insulation faults, and improves the safety of inspection and maintenance.

[0020] Refer to the instruction manual appendix Figure 1 and Figure 2 The installation mechanism includes a socket assembly disposed on the outside of the fuse body 1 and a locking assembly disposed on the socket assembly. The socket assembly is used to position the mounting plate 5, and the locking assembly is used to fasten the socket assembly.

[0021] It should be noted that the installation mechanism positions the mounting plate 5 through the sleeve assembly and secures the entire structure through the locking assembly, ensuring stable installation and reliable fixation of the device on the outside of the fuse body 1.

[0022] Refer to the instruction manual appendix Figure 1 and Figure 2 The socket assembly includes two clamps 41 disposed on the outside of the fuse body 1, a hinge shaft 42 mounted on the clamps 41, and an anti-slip pad 43 disposed on the inside of the clamps 41. The two clamps 41 are rotatably connected by the hinge shaft 42.

[0023] It should be noted that the two clamps 41 are rotatably connected by the hinge shaft 42, and can be fitted to the outside of the fuse body 1, which facilitates the installation and disassembly of the device and enhances the overall stability.

[0024] Refer to the instruction manual appendix Figure 1 and Figure 2 The locking assembly includes a positioning shaft 44 mounted on a clamp 41 on one side, a collar 45 rotatably connected to the outside of the positioning shaft 44, a screw 46 fixed on the collar 45, and a knob 47 disposed on the outside of the screw 46. The knob 47 is threadedly connected to the screw 46.

[0025] It should be noted that after the two clamps 41 are combined, the knob 47 can be rotated. With the screw thread engaging with the screw 46, the knob 47 can fit tightly against one side of the clamp 41, thereby positioning the two clamps 41.

[0026] Refer to the instruction manual appendix Figure 4 The guide assembly includes two sliders 111 fixed inside the protective sleeve 9 and two grooves opened on the outside of the connecting piece 3, with the sliders 111 slidably connected to the grooves.

[0027] It should be noted that when the protective sleeve 9 moves, it can drive the slider 111 to slide synchronously along the slide groove. The slide groove can limit the sliding direction of the slider 111, thereby improving the stability of the movement of the protective sleeve 9.

[0028] Refer to the instruction manual appendix Figure 4 and Figure 5 The limiting assembly includes a support 121 fixed on the upper sealing cover 2, a rotating shaft 122 rotatably connected to the support 121, and a limiting roller 123 fixed on the outside of the rotating shaft 122. The suspension rope is in contact with the outer surface of the limiting roller 123.

[0029] It should be noted that the limiting roller 123 is spindle-shaped and can position the suspension rope.

[0030] Refer to the instruction manual appendix Figure 1 and Figure 4 The positioning mechanism includes a support assembly disposed on the upper sealing cover 2 and a sliding assembly disposed on the support assembly. The support assembly is used to install the sliding assembly, and the sliding assembly is used to assist the movement of the connecting rod 10.

[0031] It should be noted that the positioning mechanism assists the movement of the link 10 through the support component and the sliding component, ensuring that the link 10 is accurately positioned during the protection process and improving the shielding effect.

[0032] Refer to the instruction manual appendix Figure 4 The support assembly includes a fixing plate 131 fixed on the upper sealing cover 2, a support rod 132 fixed on the fixing plate 131, and a U-shaped seat 133 mounted on the support rod 132. The connecting rod 10 passes through the slot of the U-shaped seat 133.

[0033] It should be noted that the support rod 132 is used to support and fix the U-shaped seat 133, providing stable support and maintaining the rigidity of the overall structure.

[0034] Refer to the instruction manual appendix Figure 1 and Figure 4 The sliding assembly includes a mounting groove 134 formed on the U-shaped seat 133 and a plurality of rollers 135 rotatably connected inside the mounting groove 134, the outer surface of the rollers 135 being in contact with the connecting rod 10.

[0035] It should be noted that the roller 135 enables the sliding positioning of the connecting rod 10, reduces the frictional resistance when the connecting rod 10 moves, ensures that the connecting rod 10 runs smoothly within the U-shaped seat 133, and improves the efficiency and durability of the operation.

[0036] Working principle: When the fuse body 1 melts due to overload or short circuit, the suspension rope originally pulled by the fuse wire loses its restraint and droops. At this time, the torsion spring 7 quickly resets and rotates under the drive of elastic potential energy, which drives the clamp 8 connected to it to move synchronously. The clamp 8 fits against the connecting rod 10 and applies tension, so that the protective sleeves 9 fixed at both ends of the connecting rod 10 slide synchronously towards the terminal along the sliding groove on the outside of the connecting piece 3 (guided by the slider 111 on the inside of the protective sleeve 9). During the movement, the protective sleeve 9 completely covers the exposed terminal. This action is supported by the roller 135 in the U-shaped seat 133 to reduce friction and ensure smooth sliding. At the same time, when the suspension rope is installed with the traction torsion spring 7, its path is precisely guided and positioned by the upper limit roller 123 (spindle-shaped structure) of the sealing cover 2. The whole process is completed automatically at the moment of melting and requires no external intervention.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-voltage instrument transformer overload protection device, comprising a fuse body (1), characterized in that, Both ends of the fuse body (1) are threaded with sealing caps (2), and each sealing cap (2) is equipped with a connecting piece (3). The connecting piece (3) is connected to the terminal of the high-voltage transformer. An installation mechanism is provided on the outside of the fuse body (1). An installation plate (5) is provided on the installation mechanism. A sleeve (6) is fixed on the installation plate (5). A torsion spring (7) is connected inside the sleeve (6). A clamp (8) is rotatably connected to the torsion spring (7). A protective sleeve (9) is provided on the outside of the connecting piece (3). The protective sleeve (9) is provided with a guide component. The protective sleeve (9) is slidably connected to the connecting piece (3) through the guide component. A connecting rod (10) is fixed between the two protective sleeves (9). The clamp (8) fits with the connecting rod (10). A positioning mechanism is provided on both sealing covers (2). The positioning mechanism is used to assist the connecting rod (10) in moving. A suspension rope is connected to the fuse wire of the fuse body (1). The end of the suspension rope is connected to the torsion spring (7). A limiting component for positioning the suspension rope is provided on the upper sealing cover (2).

2. The overload protection device for a high-voltage instrument transformer according to claim 1, characterized in that, The mounting mechanism includes a socket assembly located on the outside of the fuse body (1) and a locking assembly located on the socket assembly. The socket assembly is used to position the mounting plate (5), and the locking assembly is used to fasten the socket assembly.

3. The overload protection device for a high-voltage instrument transformer according to claim 2, characterized in that, The socket assembly includes two clamps (41) disposed on the outside of the fuse body (1), a hinge shaft (42) mounted on the clamps (41) and an anti-slip pad (43) disposed on the inside of the clamps (41). The two clamps (41) are rotatably connected by the hinge shaft (42).

4. The overload protection device for a high-voltage instrument transformer according to claim 3, characterized in that, The locking assembly includes a positioning shaft (44) mounted on a clamp (41) on one side, a collar (45) rotatably connected to the outside of the positioning shaft (44), a screw (46) fixed on the collar (45), and a knob (47) located on the outside of the screw (46), the knob (47) being threadedly connected to the screw (46).

5. The overload protection device for a high-voltage instrument transformer according to claim 1, characterized in that, The guide assembly includes two sliders (111) fixed inside the protective sleeve (9) and two grooves opened on the outside of the connecting piece (3), with the sliders (111) slidably connected to the grooves.

6. The overload protection device for a high-voltage instrument transformer according to claim 1, characterized in that, The limiting assembly includes a support (121) fixed on the upper sealing cover (2), a rotating shaft (122) rotatably connected to the support (121), and a limiting roller (123) fixed on the outside of the rotating shaft (122). The suspension rope is in contact with the outer surface of the limiting roller (123).

7. The overload protection device for a high-voltage instrument transformer according to claim 1, characterized in that, The positioning mechanism includes a support component disposed on the upper sealing cover (2) and a sliding component disposed on the support component. The support component is used to install the sliding component, and the sliding component is used to assist the movement of the connecting rod (10).

8. The overload protection device for a high-voltage instrument transformer according to claim 7, characterized in that, The support assembly includes a fixing plate (131) fixed on the upper sealing cover (2), a support rod (132) fixed on the fixing plate (131), and a U-shaped seat (133) mounted on the support rod (132), with the connecting rod (10) passing through the slot of the U-shaped seat (133).

9. A high-voltage transformer overload protection device according to claim 8, characterized in that, The sliding assembly includes a mounting groove (134) formed on a U-shaped seat (133) and a plurality of rollers (135) rotatably connected inside the mounting groove (134), the outer surface of the rollers (135) being in contact with the connecting rod (10).

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