A three-phase four-wire electric energy meter quick-mounting and quick-detaching bundled dynamic insulation protection device

Abstract

The present application relates to the technical field of bundled insulation protection device, and discloses a three-phase four-wire electric energy meter fast-assembly and fast-disassembly bundled dynamic insulation protection device, which comprises a bundled box assembly internally provided with a placing and mounting base, an insulation protection device is mounted above the placing and mounting base, an arc-shaped upper end cover and a temperature sensing built-in groove are arranged on a sealing cover, and the arc-shaped upper end cover cooperates with the placing and mounting base to form a wrapping structure; the placing and mounting base is internally filled with an insulating expanding agent, the bundled box assembly is internally provided with a heat-expandable flame-retardant material IFR, a hot-melt reuse-preventing safety limiting pin and a hot-melt sealing filler block; a passive heat-sensitive arc separation assembly is arranged in the arc-shaped upper end cover, and the passive heat-sensitive arc separation assembly comprises an SMA heat response driving unit, a sliding block guide frame and an insulating arc separation block; when the temperature abnormally rises, the SMA heat response driving unit is deformed by heat to drive the insulating arc separation block to quickly extend, so as to insulate and isolate and arc-protect the wire connection area.

Description

Technical Field

[0001] This invention belongs to the technical field of clustered insulation protection devices, and more specifically, it relates to a clustered dynamic insulation protection device for quick installation and removal of a three-phase four-wire energy meter. Background Technology

[0002] In the daily operation and maintenance of low-voltage power distribution networks, business expansion applications, electricity meter replacement, and live-line emergency repairs are important tasks to ensure power supply continuity and improve the quality of power supply services. These tasks typically require temporary splicing, quick disconnection, and repeated assembly of user-side conductors and electricity meter-side conductors. Therefore, the corresponding insulation protection devices should be characterized by rapid installation, rapid disassembly, temporary protection, and portability to meet the requirements of on-site construction tools.

[0003] Currently, most of the aforementioned operations are completed inside the electricity meter box, which is generally a small space with densely packed multi-phase conductors, creating a complex operating environment. Furthermore, the presence of aging conductors that have been in operation for a long time, with large wire diameters and difficulties in bending and shaping, easily leads to problems such as insufficient spacing between exposed conductors, loose conductors, and inadequate insulation during conductor connections. When abnormal heating occurs at conductor connections due to poor contact or excessive load, it can easily cause phase-to-phase short circuits, arcing, and terminal burning, affecting not only power supply reliability but also threatening the personal safety of on-site personnel. Existing insulation protection methods often involve wrapping with insulating tape, covering with insulating sheaths, or using temporary insulating barriers. These methods generally suffer from low installation efficiency, poor reusability, insufficient protective consistency, and inability to adapt to operations in confined spaces.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a clustered dynamic insulation protection device for quick installation and removal of three-phase four-wire energy meters, in order to achieve a more practical and valuable purpose. Summary of the Invention

[0005] This invention provides a quick-install and quick-release clustered dynamic insulation protection device for three-phase four-wire energy meters, which overcomes the above-mentioned defects in the prior art.

[0006] The purpose and effectiveness of this invention, a quick-install and quick-remove clustered dynamic insulation protection device for a three-phase four-wire energy meter, are achieved through the following specific technical means: A quick-install and quick-remove clustered dynamic insulation protection device for a three-phase four-wire energy meter includes a cluster box assembly, a sealing cover fixedly connected to the top of the cluster box assembly, a placement and installation base fixedly installed inside the cluster box assembly, and an insulation protection device provided on the top of the placement and installation base. The sealing cover is provided with an arc-shaped upper end cover and a built-in temperature sensing groove. The arc-shaped upper end cover and the placement and mounting base form a wrap around the insulation protection device. The inner side of the placement and mounting base is provided with an arc-shaped limiting block. The interior of the placement and mounting base is filled with an insulating expansion agent. The insulating expansion agent provides insulation protection for the insulation protection device through the arc-shaped limiting block. The built-in temperature-sensing slot is used to sense temperature changes in the insulation protection device and to display different temperature-sensing states through thermochromic test paper.

[0007] In a further technical solution, the cluster box assembly includes a cluster box shell assembly, which is rectangular. Several sets of wiring ports are symmetrically installed on the long side of the cluster box shell assembly, and several sets of pressure relief valves are arrayed on the wide side of the cluster box shell assembly. The pressure relief valves connect the inside and outside of the cluster box shell assembly.

[0008] A further technical solution is that the cluster box assembly includes an outer shell and an inner shell. The outer shell and the inner shell are provided with threaded mounting holes at the four rectangular corners of their opening ends. A side sealing groove is formed between the four sets of threaded mounting holes. The bottom back of the cluster box assembly is provided with a number of tail end mounting parts, which include sealing thrust columns and hot-melt sealing filler blocks.

[0009] A further technical solution is provided, wherein a heat-fused anti-reuse safety limit pin is installed between the outer shell and the inner shell, the heat-fused anti-reuse safety limit pin is located above the wiring port, and divides the interior of the shell into a closed cavity and an open cavity; the closed cavity is connected to the sealing thrust column through a heat-fused sealing filler block, and the interior of the closed cavity is filled with a heat-expanding flame-retardant material IFR.

[0010] In a further technical solution, the heat-expanding flame-retardant material IFR is made by mixing an intumescent flame retardant with a thermosensitive phase change microcapsule at a mass ratio of 2:1; the cluster box assembly includes a cluster box and an exhaust vent, and the heat-expanding flame-retardant material IFR diffuses into the interior of the cluster box through the exhaust vent after being heated and expanded.

[0011] A further technical solution is provided in the internal cavity of the cluster box, and four sets of placement and mounting bases corresponding to the wiring ports are fixedly installed inside the internal cavity; the arc-shaped groove array inside the placement and mounting base is provided with arc-shaped limiting blocks, the arc-shaped limiting blocks are provided with through holes, the through holes are filled with sealing flame-retardant glue, and the placement and mounting base is filled with insulating expansion agent.

[0012] A further technical solution is that the sealing cover includes an upper cover, with bolts at the four corners of the bottom of the upper cover, and a rectangular sealing strip between the four sets of bolts. The rectangular sealing strip is fixed to the open cavity by a socket. An NFC wireless module is provided inside the upper cover.

[0013] A further technical solution includes multiple sets of built-in temperature-sensing slots on the outer side of the upper cover, several sets of extended connecting columns fixedly installed on the inner side of the upper cover, and four sets of arc-shaped upper covers fixedly installed below the extended connecting columns; two sets of passive thermal arc-insulating components are provided inside the arc-shaped upper cover, each passive thermal arc-insulating component including a slider guide frame, with an SMA thermal response driving unit fixedly installed at the upper end of the slider guide frame; the output end of the SMA thermal response driving unit is connected to an insulating arc-insulating block via a push rod; and a thermosensitive color-changing test strip is attached inside the built-in temperature-sensing slot.

[0014] A further technical solution is provided, wherein the insulation protection device includes a first insulating cylinder and a second insulating cylinder, the first insulating cylinder and the second insulating cylinder being connected by threads; both are fixedly connected to a flexible rubber ring at their outer ends; the first insulating cylinder is provided with a heat dissipation insertion hole and an insulating material filling cavity; the insulating material filling cavity is filled with an insulating expansion agent; a connecting cavity is provided at the connection between the first insulating cylinder and the second insulating cylinder; an annular groove is provided on the outer surface, the annular groove cooperating with the arc-shaped limiting block.

[0015] In a further technical solution, the insulating expansion agent material is formulated with 60% heat-expanding flame-retardant material, 30% aluminum hydroxide, 8% talc, and 2% stearic acid; the hot-melt sealing filler block is made of a composite hot-melt material doped with thermosensitive phase change microcapsules.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter. It comprises a cluster box assembly 1, a mounting base 16, an insulation protection device 3, an arc-shaped upper cover 24, and an arc-shaped limiting block 18, forming a clustered, wrapped protective structure. The device utilizes the threaded quick-release connection between the first insulating cylinder 31 and the second insulating cylinder 32 to achieve rapid installation and disassembly of the wire connection area. Simultaneously, the arc-shaped limiting block 18, in conjunction with the annular groove 35, achieves precise positioning, and an insulating expansion agent is used to dynamically reinforce the insulation of the wire connection area. This solves the problems of low efficiency and poor stability of traditional insulating tape wrapping, as well as the difficulty in neatly protecting wires within a small meter box. It improves the construction efficiency and insulation protection reliability of meter replacement, business expansion applications, and live-line emergency repairs.

[0017] This invention discloses a quick-install and quick-dismantle clustered dynamic insulation protection device for a three-phase four-wire energy meter. It incorporates a built-in temperature-sensing slot 22, an extension connecting post 23, a thermosensitive color-changing test paper, and a passive thermosensitive arc-blocking assembly 28. The SMA thermal response drive unit 281, upon heating, deforms the phase, driving the insulating arc-blocking block 283 to move directionally along the slider guide frame 282. This allows the insulating arc-blocking block 283 to quickly extend and form insulation when the conductor experiences abnormal heating. Simultaneously, heat is transferred through the extension connecting post 23 to the built-in temperature-sensing slot 22, enabling visual early warning of fault temperature rise. This provides passive monitoring, active arc blocking, and fault early warning functions for the conductor connection area, reducing the risk of arc propagation and phase-to-phase short circuits, and improving the device's operational safety.

[0018] This invention discloses a quick-install and quick-dismantle clustered dynamic insulation protection device for a three-phase four-wire energy meter. This device incorporates a heat-fused anti-reuse safety limit pin 25, a sealing thrust column 191, a heat-fused sealing filler block 192, a heat-expanding flame-retardant material IFR, an exhaust port 112, and a pressure relief valve 13. When a local fault further develops into an overall high-temperature state, the heat-fused sealing filler block 192 melts and conducts, causing the heat-expanding flame-retardant material IFR to rapidly diffuse into the cluster housing 111, forming a full-coverage insulation and flame-retardant arc-extinguishing protection for the conductors and connection areas. Simultaneously, the pressure relief valve 13 releases pressure, and the heat-fused anti-reuse safety limit pin 25 undergoes irreversible failure locking. This constructs a multi-level safety protection system integrating fault suppression, arc extinguishing and flame retardancy, pressure release, and anti-reuse, further enhancing the device's safety assurance capabilities under extreme fault conditions and its full life-cycle management level. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the overall side view structure of the present invention; Figure 4 This is a schematic diagram of the overall side sectional structure of the present invention; Figure 5 This is a partial side-section structural diagram of the present invention; Figure 6 This is a schematic diagram of the overall side cross-sectional structure of the present invention; Figure 7 This is a partial internal structure diagram of the cluster box assembly of the present invention; Figure 8 This is a partial top view of the cluster box assembly of the present invention; Figure 9 This is a side view and a schematic diagram of the external structure of the sealing cap of the present invention; Figure 10 This is a schematic diagram showing the overall and split-type appearance structure of the insulation protection device of the present invention; Figure 11 This is a schematic diagram of the overall side cross-section of the insulation protection device of the present invention; Figure 12 This is a schematic diagram of the overall appearance and structure of the passive thermal arc isolation component of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Cluster box assembly; 11. Cluster box shell assembly; 111. Cluster box shell; 112. Exhaust vent; 12. Wiring port; 13. Pressure relief valve; 14. Insulating cavity; 15. Threaded mounting hole; 16. Mounting base; 17. Side sealing groove; 18. Arc-shaped limiting block; 19. Tail end mounting component; 191. Sealing thrust column; 192. Hot-melt sealing packing block; 2. Sealing cap; 21. Top cap; 22. Temperature sensing built-in groove; 23. Extension connecting post; 24. Arc-shaped top cap; 25. Heat-melted anti-reuse safety limit pin; 26. Bolt; 27. Rectangular sealing strip; 28. Passive thermal arc-damping assembly; 281. SMA thermal response drive unit; 282. Slider guide frame; 283. Insulating arc-damping block; 3. Insulation protection device; 31. First insulating cylinder; 32. Second insulating cylinder; 33. Heat dissipation insertion hole; 34. Flexible rubber ring; 35. Annular groove; 36. Connecting cavity; 37. Insulation material filling cavity. Detailed Implementation

[0023] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] As attached Figure 1 To be continued Figure 12 As shown: This invention provides a quick-install and quick-remove clustered dynamic insulation protection device for a three-phase four-wire energy meter, including a cluster box assembly 1, a sealing cover 2 fixedly connected to the top of the cluster box assembly 1, a placement and installation base 16 fixedly installed inside the cluster box assembly 1, and an insulation protection device 3 provided above the placement and installation base 16. The sealing cover 2 is provided with an arc-shaped upper cover 24 and a temperature sensing built-in groove 22. The arc-shaped upper cover 24 and the placement and mounting base 16 form a wrap around the insulation protection device 3. The inner side of the placement and mounting base 16 is provided with an arc-shaped limiting block 18. The interior of the placement and mounting base 16 is filled with an insulating expansion agent. The insulating expansion agent provides insulation protection for the insulation protection device 3 through the arc-shaped limiting block 18. The built-in temperature-sensing groove 22 is used to sense the temperature change of the insulation protection device 3 and to display different temperature-sensing states through thermosensitive color-changing test paper.

[0027] Preferred options are shown in the appendix. Figure 3 To be continued Figure 5 The cluster box assembly 1 includes a cluster box shell assembly 11, which is rectangular. Several sets of wiring ports 12 are symmetrically installed on the long side of the cluster box shell assembly 11, and several sets of pressure relief valves 13 are arrayed on the wide side of the cluster box shell assembly 11. The pressure relief valves 13 connect the inside and outside of the cluster box shell assembly 11.

[0028] Preferred options are shown in the appendix. Figure 3 To be continued Figure 6 The cluster box assembly 11 includes an outer shell and an inner shell. The outer shell and the inner shell are provided with threaded mounting holes 15 at the four rectangular corners of their opening ends. A side sealing groove 17 is formed between the four sets of threaded mounting holes 15. The bottom back of the cluster box assembly 11 is provided with a number of tail end mounting parts 19. The tail end mounting parts 19 include sealing thrust columns 191 and hot melt sealing filler blocks 192.

[0029] Preferred options are shown in the appendix. Figure 3 To be continued Figure 6 A heat-fused anti-reuse safety limit pin 25 is installed between the outer shell and the inner shell. The heat-fused anti-reuse safety limit pin 25 is located above the wiring port 12 and divides the interior of the shell into a closed cavity and an open cavity. The closed cavity is connected to the sealing thrust column 191 through a heat-fused sealing filler block 192. The closed cavity is filled with heat-expanding flame-retardant material IFR.

[0030] Preferred options are shown in the appendix. Figure 3 To be continued Figure 6 The heat-expandable flame retardant material IFR is made by mixing an intumescent flame retardant with a thermosensitive phase change microcapsule at a mass ratio of 2:1; the cluster box assembly 11 includes a cluster box 111 and an exhaust vent 112, and the heat-expandable flame retardant material IFR diffuses into the interior of the cluster box 111 through the exhaust vent 112 after being heated and expanded.

[0031] Preferred options are shown in the appendix. Figure 3 To be continued Figure 6 The bundle box shell 111 has an insulating cavity 14 inside, and four sets of placement and mounting bases 16 corresponding to the wiring ports 12 are fixedly installed inside the insulating cavity 14. The placement and mounting base 16 has an arc-shaped groove array with arc-shaped limiting blocks 18. The arc-shaped limiting blocks 18 have through holes, and the through holes are filled with sealing flame-retardant glue. The placement and mounting base 16 is filled with insulating expansion agent.

[0032] Preferred options are shown in the appendix. Figure 3 To be continued Figure 9 The sealing cover 2 includes an upper cover 21, with bolts 26 at the four corners of the bottom of the upper cover 21, and a rectangular sealing strip 27 between the four sets of bolts 26. The rectangular sealing strip 27 is fixed to the open cavity. An NFC wireless module is provided inside the upper cover 21.

[0033] Preferred options are shown in the appendix. Figure 6 To be continued Figure 12The upper end cover 21 has multiple sets of built-in temperature sensing slots 22 on its outer side, and several sets of extension connecting columns 23 are fixedly installed on the inner side of the upper end cover 21. Four sets of arc-shaped upper end covers 24 are fixedly installed below the extension connecting columns 23. The arc-shaped upper end cover 24 has two sets of passive thermal arc-insulating components 28 inside. The passive thermal arc-insulating components 28 include a slider guide frame 282. An SMA thermal response driving unit 281 is fixedly installed on the upper end of the slider guide frame 282. The output end of the SMA thermal response driving unit 281 is connected to an insulating arc-insulating block 283 through a push rod. Thermosensitive color-changing test paper is attached inside the temperature sensing slots 22.

[0034] Preferred options are shown in the appendix. Figure 8 To be continued Figure 11 The insulation protection device 3 includes a first insulating cylinder 31 and a second insulating cylinder 32, which are connected by threads. Both have a flexible rubber ring 34 fixedly connected to their outer ends. The first insulating cylinder 31 is provided with a heat dissipation insertion hole 33 and an insulating material filling cavity 37. The insulating material filling cavity 37 is filled with an insulating expansion agent. A connecting cavity 36 is provided at the connection between the first insulating cylinder 31 and the second insulating cylinder 32. An annular groove 35 is provided on the outer surface, which cooperates with the arc-shaped limiting block 18.

[0035] Preferred options are shown in the appendix. Figure 6 To be continued Figure 11 The insulating expansion agent material is formulated with 60% heat-expanding flame retardant material, 30% aluminum hydroxide, 8% talc, and 2% stearic acid; the hot-melt sealing filler block 192 is made of a composite hot-melt material doped with thermosensitive phase change microcapsules.

[0036] Specific usage of this invention: When using this device, firstly, snap-fit ​​the cluster box assembly 1 into the inside of the meter box. It uses a snap-fit ​​structure adapted to the internal mounting slot of the meter box, eliminating the need for additional drilling and enabling quick positioning and installation in confined spaces. Then, separate the cluster box assembly 1 from the sealing cover 2 using bolts 26 and threaded mounting holes 15. During separation, the rectangular sealing strip 27 disengages from the open cavity, ensuring smooth separation without damaging the sealing structure. After separation, remove the insulation protection device 3 from the mounting base 16, enabling rapid connection and temporary protection of wires during meter rotation and live-line repairs. The advantages are that the snap-fit ​​installation and bolt connection design allow for tool-free quick installation and disassembly, significantly improving the efficiency of wire connection and device maintenance in confined meter boxes, reducing the workload of workers. Simultaneously, the detachable design facilitates the quick removal and placement of the insulation protection device 3, ensuring convenient and smooth wire connection operations. The snap-fit ​​structure enhances installation stability and prevents loosening during subsequent use.

[0037] In traditional operations, live-line repairs and meter replacements in confined meter boxes present challenges. Old, large-diameter outdoor wires are difficult to shape, and manually wrapping them with insulating tape is time-consuming and prone to loosening. Multiple exposed wire ends in confined spaces can easily cause phase-to-phase short circuits. Traditional insulation methods cannot meet the needs for temporary, dynamic, and rapid protection. This device, through the synergistic action of insulation protection device 3, insulating expansion agent, heat-expanding flame-retardant material IFR, and passive thermal arc-damping component 28, forms temporary, dynamic, and bundled insulation protection at wire joints, preventing short circuits caused by wire loosening or displacement. Simultaneously, combined with temperature monitoring and a passive emergency arc-extinguishing mechanism, it enables early fault warning and rapid response, improving the safety and efficiency of meter replacement and live-line repair operations.

[0038] During operation, firstly, the meter-side wire and the load-side wire are inserted into the wiring ports 12 at both ends of the device, respectively. The inner side of the wiring port 12 is adapted to the flexible rubber ring 34 to achieve a tight fit between the wires. Then, the insulation protection device 3 is rotated, and the threaded structure of the first insulating cylinder 31 and the second insulating cylinder 32 is used to quickly separate them, exposing the connecting cavity 36 for easy wire splicing. The wires on both sides are then inserted into the first insulating cylinder 31 and the second insulating cylinder 32 respectively, and the flexible rubber ring 34 provides buffer protection for the outer surface of the wires. After the wire splicing is completed, the first insulating cylinder 31 and the second insulating cylinder 32 are quickly screwed together to achieve a sealed wrap at the wire splice. Then, the insulation protection device 3 is inserted into the mounting base 16, so that the arc-shaped limiting block 18 and the annular groove are aligned. 35 work together to achieve stable limiting of the insulation protection device 3; finally, the sealing cover 2 is connected to the bundle box assembly 1 and locked by bolts 26, and the rectangular sealing strip 27 achieves overall sealing; the effect is that, under the premise of following the relevant electrical work safety specifications and using necessary insulating tools and safety protection measures, the installation, disassembly and removal of the device itself and the placement of the insulation protection device 3 do not require additional special assembly tools, which is suitable for rapid operation in narrow meter box environments. The flexible rubber ring 34 adapts to the use of wires of different diameters, the connecting cavity 36 ensures stable and reliable wire connection, and the arc-shaped limiting block 18 prevents the insulation protection device 3 from shaking, meeting the temporary insulation protection needs during meter replacement and live-line repair.

[0039] When the wire connection area experiences an abnormal temperature rise due to poor contact, overload operation, or short circuit fault, the heat is transferred to the arc-shaped upper cover 24 through the heat dissipation pin 33, and then conducted to the temperature-sensing built-in groove 22 via the extension connecting post 23. The thermosensitive color-changing test paper set inside the temperature-sensing built-in groove 22 changes color, thereby changing color according to the temperature rise, thus providing the staff with a visual status prompt of abnormal temperature rise in the wire connection area; at the same time, the passive thermosensitive arc isolation component 28 synchronously senses the temperature change in the wire connection area.

[0040] When the temperature reaches the operating temperature of the SMA thermal response drive unit 281, the SMA thermal response drive unit 281 undergoes thermally induced phase deformation and generates axial displacement. This displacement, via a push rod, pushes the insulating arc-blocking block 283 to move directionally along the slider guide frame 282. Guided by the slider guide frame 282, the insulating arc-blocking block 283 gradually extends towards the heat dissipation socket 33 and enters the wire connection area. This allows the insulating arc-blocking block 283 to extend between adjacent conductors in the wire connection area, forming spatial insulation to reduce the risk of arc discharge and phase-to-phase short circuits between adjacent conductors. Simultaneously, heat is continuously transferred to the temperature-sensing built-in slot 22 via the extension connecting post 23. The thermosensitive color-changing test paper displays the fault status in real time, facilitating rapid identification of abnormal areas by staff.

[0041] After the arc-blocking protection is formed, the high temperature causes the sealing flame-retardant adhesive to soften. The insulating expansion agent inside the mounting base 16 expands due to heat and diffuses into the wire connection area through the corresponding holes, forming a wrapping insulation protection for the faulty wire. The expanding flame-retardant component forms a porous carbonized layer when heated, which isolates the faulty area. The aluminum hydroxide component absorbs heat and reduces the local temperature, achieving a synergistic effect of insulation protection and flame-retardant arc extinguishing. The internal pressure generated during the expansion process is released in an orderly manner through the pressure relief valve 13, thereby ensuring the stability of the internal structure of the bundle box assembly 1.

[0042] When the device experiences abnormal high temperature or after the protection action, the thermo-melted anti-reuse safety limit pin 25 undergoes irreversible thermo-melting deformation, causing the device to enter the protection state; at the same time, the fault status is continuously displayed by the thermosensitive color-changing test paper, and the staff can quickly locate the fault location and replace the corresponding insulation protection device 3 according to the display status. During the replacement process, it is not necessary to remove the overall bundle box assembly 1, thereby reducing maintenance costs and improving maintenance efficiency.

[0043] When multiple sets of wires simultaneously experience abnormal heating and the high temperature spreads throughout the entire bundle assembly 1, the heat-fused anti-reuse safety limit pin 25 senses the overall temperature rise and triggers the melting of the heat-fused sealing filler block 192; the heat-expanding flame-retardant material IFR stored inside the sealed cavity rapidly expands and diffuses into the bundle shell 111 through the exhaust hole 112, forming a covering insulating flame-retardant layer over the fault area, thereby suppressing arc propagation and fault spread; at the same time, the pressure relief valve 13 performs synchronous exhaust and pressure stabilization to achieve emergency safety protection under extreme working conditions.

[0044] After the device completes emergency protection, it can read the device's identity information and maintenance records through the NFC wireless module. Combined with the status display of the thermal color-changing test paper, it can achieve rapid inspection and maintenance management, providing status traceability basis for meter rotation and live-line emergency repair operations.

[0045] This invention discloses a quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter. It comprises a cluster box assembly 1, a mounting base 16, an insulation protection device 3, an arc-shaped upper cover 24, and an arc-shaped limiting block 18, forming a clustered, wrapped protective structure. The device utilizes the threaded quick-release connection between the first insulating cylinder 31 and the second insulating cylinder 32 to achieve rapid installation and disassembly of the wire connection area. Simultaneously, the arc-shaped limiting block 18, in conjunction with the annular groove 35, achieves precise positioning, and an insulating expansion agent is used to dynamically reinforce the insulation of the wire connection area. This solves the problems of low efficiency and poor stability of traditional insulating tape wrapping, as well as the difficulty in neatly protecting wires within a small meter box. It improves the construction efficiency and insulation protection reliability of meter replacement, business expansion applications, and live-line emergency repairs.

[0046] This invention discloses a quick-install and quick-dismantle clustered dynamic insulation protection device for a three-phase four-wire energy meter. It incorporates a built-in temperature-sensing slot 22, an extension connecting post 23, a thermosensitive color-changing test paper, and a passive thermosensitive arc-blocking assembly 28. The SMA thermal response drive unit 281, upon heating, deforms the phase, driving the insulating arc-blocking block 283 to move directionally along the slider guide frame 282. This allows the insulating arc-blocking block 283 to quickly extend and form insulation when the conductor experiences abnormal heating. Simultaneously, heat is transferred through the extension connecting post 23 to the built-in temperature-sensing slot 22, enabling visual early warning of fault temperature rise. This provides passive monitoring, active arc blocking, and fault early warning functions for the conductor connection area, reducing the risk of arc propagation and phase-to-phase short circuits, and improving the device's operational safety.

[0047] This invention discloses a quick-install and quick-dismantle clustered dynamic insulation protection device for a three-phase four-wire energy meter. This device incorporates a heat-fused anti-reuse safety limit pin 25, a sealing thrust column 191, a heat-fused sealing filler block 192, a heat-expanding flame-retardant material IFR, an exhaust port 112, and a pressure relief valve 13. When a local fault further develops into an overall high-temperature state, the heat-fused sealing filler block 192 melts and conducts, causing the heat-expanding flame-retardant material IFR to rapidly diffuse into the cluster housing 111, forming a full-coverage insulation and flame-retardant arc-extinguishing protection for the conductors and connection areas. Simultaneously, the pressure relief valve 13 releases pressure, and the heat-fused anti-reuse safety limit pin 25 undergoes irreversible failure locking. This constructs a multi-level safety protection system integrating fault suppression, arc extinguishing and flame retardancy, pressure release, and anti-reuse, further enhancing the device's safety assurance capabilities under extreme fault conditions and its full life-cycle management level.

[0048] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A quick-install and quick-release clustered dynamic insulation protection device for a three-phase four-wire energy meter, comprising a cluster box assembly (1), wherein a sealing cover (2) is fixedly connected to the top of the cluster box assembly (1), characterized in that: The cluster box assembly (1) has a fixed mounting base (16) inside, and an insulation protection device (3) is provided above the mounting base (16). The sealing cover (2) is provided with an arc-shaped upper end cover (24) and a temperature sensing built-in groove (22). The arc-shaped upper end cover (24) and the placement and mounting base (16) together wrap the insulation protection device (3). The inner side of the mounting base (16) is provided with an arc-shaped limiting block (18), and the interior of the mounting base (16) is filled with an insulating expansion agent. The insulating expansion agent acts on the outside of the insulating protection device (3) through the arc-shaped limiting block (18). The built-in temperature sensing slot (22) is used to sense the temperature change of the insulation protection device (3); The arc-shaped upper cover (24) is provided with a passive thermal arc-isolating component (28). The passive thermal arc-isolating component (28) includes an SMA thermal response drive unit (281), a slider guide frame (282), and an insulating arc-isolating block (283). After the SMA thermal response drive unit (281) undergoes phase deformation due to heat, it drives the insulating arc-isolating block (283) to move along the slider guide frame (282) to form an insulating isolation for the internal wires of the insulation protection device (3).

2. The quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 1, characterized in that: The cluster box assembly (1) includes a cluster box shell assembly (11), which is rectangular and has several sets of wiring ports (12) symmetrically installed on its long side. Several pressure relief valves (13) are arranged on its wide side array. The pressure relief valves (13) connect the inside and outside of the cluster box shell assembly (11) and only allow gas to pass through.

3. The quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 2, characterized in that: The cluster box assembly (11) includes an outer shell and an inner shell, with threaded mounting holes (15) at the four corners of the opening ends of both, and a side sealing groove (17) is formed between the four sets of threaded mounting holes (15); the bottom back of the cluster box assembly (11) is provided with a number of tail end mounting parts (19), and the tail end mounting parts (19) include a sealing thrust column (191) and a hot melt sealing filler block (192).

4. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 3, characterized in that: A heat-fused anti-reuse safety limit pin (25) is installed between the outer shell and the inner shell. The heat-fused anti-reuse safety limit pin (25) is located above the wiring port (12) and divides the interior of the shell into a closed cavity and an open cavity. The closed cavity is connected to the sealing thrust column (191) through a heat-fused sealing filler block (192). The closed cavity is filled with heat-expanding flame-retardant material IFR.

5. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 4, characterized in that: The heat-expandable flame retardant material IFR is made by mixing an intumescent flame retardant with a thermosensitive phase change microcapsule at a mass ratio of 2:1; the cluster box assembly (11) includes a cluster box (111) and an exhaust vent (112). After the heat-expandable flame retardant material IFR expands due to heat, it diffuses into the interior of the cluster box (111) through the exhaust vent (112).

6. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 5, characterized in that: The bundle box shell (111) has an insulating cavity (14) inside, and four sets of placement and mounting bases (16) corresponding to the wiring ports (12) are fixedly installed in the insulating cavity (14); the placement and mounting base (16) has an arc-shaped groove array with arc-shaped limiting blocks (18), the arc-shaped limiting blocks (18) have through holes, the through holes are filled with sealing flame-retardant glue, and the placement and mounting base (16) is filled with insulating expansion agent.

7. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 6, characterized in that: The sealing cover (2) includes an upper cover (21), with bolts (26) at the four corners of the bottom of the upper cover (21), and a rectangular sealing strip (27) between the four sets of bolts (26); the bolts (26) are threadedly connected to the threaded mounting holes (15), and the rectangular sealing strip (27) is fixed to the open cavity; the upper cover (21) is equipped with an NFC wireless module inside.

8. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 7, characterized in that: The upper end cover (21) has multiple sets of temperature-sensing built-in grooves (22) on the outside and several extension connecting columns (23) fixed on the inside. Four sets of arc-shaped upper end covers (24) corresponding to the temperature-sensing built-in grooves (22) are fixed below the extension connecting columns (23). Thermosensitive color-changing test paper is attached inside the temperature-sensing built-in grooves (22).

9. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 8, characterized in that: The insulation protection device (3) includes a first insulating cylinder (31) and a second insulating cylinder (32) connected by threads, and both of them are fixedly connected to a flexible rubber ring (34) at their outer ends; the first insulating cylinder (31) is provided with a heat dissipation insertion hole (33) and an insulating material filling cavity (37), and its inner ring wall is provided with multiple sets of holes, and the insulating material filling cavity (37) is filled with an insulating expansion agent; a connecting cavity (36) is provided at the connection between the first insulating cylinder (31) and the second insulating cylinder (32), and an annular groove (35) is provided on the outer surface to cooperate with the arc-shaped limiting block (18).

10. A quick-installation and quick-removal clustered dynamic insulation protection device for a three-phase four-wire energy meter according to claim 9, characterized in that: The insulating expansion agent is composed of 60% heat-expanding flame retardant material, 30% aluminum hydroxide, 8% talc and 2% stearic acid; the hot-melt sealing filler block (192) is made of composite hot-melt material doped with thermosensitive phase change microcapsules.

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