Power wire clamp

Abstract

The utility model provides a power line clamp. The power line clamp comprises a gland, a bracket, a pressing strip and a thermoelectric power generation structure. Wherein the gland and the bracket are connected through a fixing bolt, and the gland and the bracket are respectively provided with a wire slot; the pressing strip is located between the fixing bolt and the gland. A limiting sinking groove is formed in the top face of the pressing strip. The bottom surface of the pressing strip is a profiling curved surface and is matched with the upper surface of the gland; a thermoelectric power generation structure is attached to the surface of the gland. The thermoelectric power generation structure is a multi-layer structure and is at least provided with an insulating heat conduction layer, a thermoelectric power generation sheet and a heat dissipation layer; the insulating heat-conducting layer is attached to the gland, and the thermoelectric power generation sheet is located between the insulating heat-conducting layer and the heat dissipation layer. Effective electric signals can be provided under the abnormal heating condition through the temperature difference power generation structure, and therefore overtemperature early warning is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrically conductive connection, in particular to a power line clamp. BACKGROUND

[0002] In the power transmission and distribution network of the power system, the power line clamp is a key component for mechanical connection and electrical conduction between conductors, and its performance directly affects the safe and stable operation of the power line. The power line clamp can be applied in various fields of power connection lines, and its application scenarios cover the tower connection of high-voltage transmission lines, the parallel connection of branch lines in distribution networks, and the terminal connection of electrical equipment, etc. In different application scenarios, there are different requirements for the structural design, mechanical strength and electrical performance of the power line clamp. In the prior art, for example, the parallel groove clamp has a wide application in the jumper connection of the power transmission and distribution network due to its simple structure and convenient installation. The main function of the parallel groove clamp is to realize the parallel connection of multiple conductors, which is commonly used in the connection of main lines and branch lines, the jumper fixing of non-straight towers, etc., and is especially suitable for the connection of medium and small cross-section conductors.

[0003] In the prior art, there is a design for intelligent improvement of the traditional parallel groove clamp. Specifically, during the operation of the parallel groove clamp, an excessively large contact resistance can cause an abnormal temperature rise. A high temperature not only accelerates the oxidation and corrosion of the metal components of the clamp, but also further increases the contact resistance, forming a vicious cycle. Therefore, the intelligent improvement of the parallel groove clamp mainly focuses on temperature monitoring. Usually, an external temperature sensor is used, for example, the temperature sensor is fixed on the surface of the clamp through a mechanical structure, or a paste-type sensor is directly attached to the outer wall of the clamp. However, from the safety, equipment cost and power metering perspectives, the required power of the external temperature sensor does not consider direct or inductive power from the power transmission line, but needs to be powered by an external battery. However, battery power has the problems of short endurance period, the need for regular battery replacement or the addition of external charging equipment, etc. For example, the commonly used power supply equipment for intelligent modification is a photovoltaic panel, which significantly increases the cost and increases the later operation and maintenance cost.

[0004] In summary, the parallel groove clamp in the prior art still has deficiencies in structural design and operation state monitoring. The monitoring method of the external temperature sensor has the problems of complex installation, inconvenient power supply and difficult cost control, making it difficult to realize long-term stable monitoring of the operation state of the clamp. CONTENT OF THE INVENTION

[0005] The present application provides a passive power line clamp technical solution with integrated temperature monitoring function structure design to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] The application provides a power cable clamp, which mainly comprises a gland, a holder, a pressing strip and a thermoelectric power generation structure.

[0008] The gland and the holder are connected by a fixing bolt, and the gland and the holder are both provided with a wire slot.

[0009] The pressing strip is located between the fixing bolt and the gland, the top surface of the pressing strip is provided with a limiting groove, and the nut of the fixing bolt is matched with the limiting groove; the bottom surface of the pressing strip is a profiled curved surface and is matched with the upper surface of the gland.

[0010] The surface of the gland is further attached with the thermoelectric power generation structure; the thermoelectric power generation structure is a multi-layer structure and is provided with at least an insulating heat-conducting layer, a thermoelectric power generation sheet and a heat dissipation layer; the insulating heat-conducting layer is attached with the gland, and the thermoelectric power generation sheet is located between the insulating heat-conducting layer and the heat dissipation layer.

[0011] Optionally, the insulating heat-conducting layer is a heat-conducting ceramic sheet; the bottom surface of the insulating heat-conducting layer is a profiled curved surface and is matched with the upper surface of the gland.

[0012] Optionally, the surface of the heat dissipation layer is provided with a heat dissipation fin.

[0013] Optionally, the side edge of the thermoelectric power generation structure is provided with an insulating glue seal between the thermoelectric power generation structure mounting position.

[0014] Optionally, the upper surface of the gland is a cylindrical structure; the lower part of the gland is provided with two symmetrical convex parts, and the end surface of each convex part is provided with the wire slot.

[0015] When the gland is matched with the holder, the wire slot of the gland is located inside the wire slot of the holder.

[0016] Optionally, the upper part of the holder is provided with two parallel wire slots, which respectively embrace the cable with the wire slots of the gland.

[0017] A boss is arranged between the two wire slots; the boss is provided with a plurality of connecting through holes penetrating up and down, and the fixing bolt is arranged in the connecting through hole.

[0018] Optionally, the lower surface of the holder is a plane structure, and an open elastic washer and a gasket are sequentially arranged between the nut of the fixing bolt and the holder.

[0019] Optionally, in the gland and the holder, the wire slot and the wire slot edge on one side are provided with a surface copper layer; at least part of the wire slot is provided with a tooth-shaped anti-skid structure, and the tooth top of the tooth-shaped anti-skid structure is not higher than the adjacent wire slot surface.

[0020] Optionally, the upper surface of the cover is a cylindrical arc surface, and the bottom surface of the pressing strip is an inner concave arc surface.

[0021] The bottom surface of the pressing strip is higher than the upper surface of the cover at the vertex.

[0022] Optionally, the thermoelectric power generation structure is externally connected with a communication module through a wire, for receiving a thermoelectric power generation sheet voltage signal and forwarding to the edge computing device.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The present application can provide effective electrical signals under abnormal heating conditions through the thermoelectric power generation structure, thereby realizing over-temperature early warning, and the early warning signal will dynamically respond to changes in the external environment, thereby solving the false alarm problem caused by environmental warming. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 It is a front view of the power line clamp in the specific embodiment of the present application.

[0027] Figure 2 It is a front perspective view of the power line clamp in the specific embodiment of the present application.

[0028] Figure 3 It is a bottom perspective view of the power line clamp in the specific embodiment of the present application.

[0029] Figure 4 It is a perspective view of the thermoelectric power generation structure in the specific embodiment of the present application.

[0030] Figure 5 It is an exploded view of the thermoelectric power generation structure in the specific embodiment of the present application.

[0031] Figure 6 It is a connection schematic diagram of the thermoelectric power generation structure in the specific embodiment of the present application.

[0032] Figure 7 It is a schematic diagram of the wire slot structure in the specific embodiment of the present application.

[0033] In the diagram: 1. Pressure cap, 2. Support, 3. Pressure strip, 4. Fixing bolt, 5. Locking nut, 6. Thermoelectric generator structure, 7. Data acquisition card, 8. Communication module, 201. Toothed anti-slip structure, 202. Copper-clad layer of support, 601. Insulating and heat-conducting layer, 602. Heat dissipation layer, 603. Heat dissipation fins, 604. Thermoelectric generator plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be understood that the relative relationships indicated by terms such as "upper", "lower", and "front" are based on the positions shown in the accompanying drawings and are intended to facilitate the description of this application and simplify the description, rather than indicating or implying that the device or element referred to must have a specific position, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] It is worth noting that, unless otherwise specified, the methods used in this application are all conventional methods; and the raw materials and equipment used are all conventional commercially available products, and their sources are not specifically limited.

[0040] like Figures 1-7 As shown, this embodiment provides a power line clamp. It should be noted that, for ease of description and understanding, this embodiment uses a parallel groove clamp as an example, which mainly includes a pressure cover 1, a support 2, a pressure strip 3, and a thermoelectric power generation structure 6.

[0041] In this embodiment, the pressure cap 1 has a cylindrical structure with an arc-shaped curved surface on the upper surface, specifically an elliptical arc surface. The lower part of the pressure cap 1 has a double-claw structure, consisting of two symmetrical protrusions, and each claw-shaped structure has an axially penetrating groove on its end face. The groove surface of the pressure cap 1 is an arc-shaped structure. A recessed countersunk groove is provided in the middle of the pressure cap 1. Furthermore, the pressure cap 1 has parallel bolt mounting through holes along the axial direction for installing and fixing bolts 4.

[0042] In this embodiment, the support 2 is also cylindrical, with two parallel wire grooves on its upper surface. The wire grooves of the support 2 are adapted to the wire grooves of the pressure cap 1, and can respectively clamp the cable with the corresponding wire grooves on the pressure cap 1. Specifically, the width of the wire groove of the pressure cap 1 is smaller than the width of the wire groove of the support 2. The wire groove of the pressure cap 1 is located inside the wire groove of the support 2, and during the clamping process of the pressure cap 1 and the support 2, the wire groove of the pressure cap 1 can enter the wire groove of the support 2. The prismatic boss between the two wire grooves of the support 2 is adapted to the recess of the pressure cap 1. The lower cross section of the support 2 has a multi-segment spliced ​​profile, that is, the bottom surface is a planar structure and the two sides are arc-shaped structures. Correspondingly, two vertically penetrating connecting holes are provided on the prismatic boss of the support 2. The fixing bolts are installed in the connecting holes, and the locking nuts 5 matching the fixing bolts 4 are installed on the bottom surface. An open elastic washer and a gasket are also fitted on the fixing bolt 4. The gasket is placed against the bottom surface of the bracket 2, and then the open elastic washer is fitted. After that, the locking nut 5 is installed and tightened to the preset torque.

[0043] Preferably, in this embodiment, one side of the support 2 and the pressure cap 1 is configured as a copper-aluminum transition structure, that is, the base of both the support 2 and the pressure cap 1 is made of aluminum, and a copper-clad layer is provided on the wire groove and the edge of the wire groove on one side. Specifically, the copper sheet can be welded to the wire groove and the edge area of ​​the wire groove through a hot rolling welding process. In this embodiment, specifically, the copper sheet is... Figure 1 The pressure cover 1 and the bracket 2 cable tray located on the right side are provided with a copper-clad layer; Reference Figure 5 As shown, taking the corresponding cable tray of bracket 2 as an example, a copper sheet is welded to the middle of the cable tray to form a copper-clad layer 202 on the bracket, and toothed anti-slip structures 201 are processed at both ends of the cable tray. The toothed anti-slip structures 201 are processed by a subtractive manufacturing process, such as double-sided boring, so that the tooth tips of the toothed anti-slip structures 201 are not higher than the surface of the adjacent copper-clad layer 202 on the bracket. Through the combined design of the toothed anti-slip structures 201 and the copper-clad layer 202 on the bracket, it can adapt to the application scenarios of copper-aluminum parallel groove cable clamps on the one hand, and provide better clamping stability on the other hand.

[0044] In order to increase the anti-loosening performance of the fastener, the pressing strip 3 is arranged between the fixing bolt 4 and the gland 1. Specifically, the pressing strip 3 has a long strip structure, the upper part is a sunken square groove structure, and the lower part is a profiled curved surface and cooperates with the upper surface of the gland 1. Based on the design of the foregoing gland 1, the lower surface of the pressing strip 3 of the embodiment is also an arc-shaped concave curved surface, specifically an elliptical arc surface, which cooperates with the upper surface of the gland 1. Since the gland 1 will be deformed after being pressed by the fixing bolt 4 and the lock nut 5, and the deformation will be aggravated due to the working temperature, the bottom vertex of the pressing strip 3 is higher than the upper vertex of the gland 1 in combination with the allowance design, that is, the curvatures of the bottom surface of the pressing strip 3 and the upper surface of the gland 1 are adjusted, so that the two edges of the bottom surface of the pressing strip 3 contact the upper surface of the gland 1 and the middle section is separated from the upper surface of the gland 1 to form a reserved gap to cope with the later deformation when the pressing strip 3 is not clamped after assembly. When in the working position, the above gap is eliminated due to the influence of the pressure of the fixing bolt 4 and the lock nut 5 and the working temperature, and the bottom surface of the pressing strip 3 can completely fit the upper surface of the gland 1, so that more balanced pressure is applied to the gland 1, the cable is clamped more stably, and the probability of cracking of each structural part or stress concentration area is reduced. Further, the square groove structure of the top surface of the pressing strip 3 is a limiting sunken groove, the width of which is matched with the screw cap of the fixing bolt 4, the screw cap of the fixing bolt 4 is embedded in the limiting sunken groove, and the rotation of the fixing bolt 4 can be limited by the two side groove walls. Further, two axial through holes are also machined on the pressing strip 3 for mounting the fixing bolt 4.

[0045] The surface of the gland 1 is also attached with a thermoelectric power generation structure 6. Specifically, the thermoelectric power generation structure 6 is arranged on both sides of the pressing strip of the gland 1 and is not arranged in the mounting area of the pressing strip 3. Among them, in combination with the design of the pressing strip 3, the thermoelectric power generation structure 6 is arranged on the two sides of the pressing strip 3, and the two sides of the pressing strip 3 are respectively arranged with a thermoelectric power generation structure 6. Figures 1-5As shown, the temperature difference power generation structure 6 is a multi-layer structure, specifically provided with three layers, namely the insulating heat conducting layer 601, the temperature difference power generation sheet 604 and the heat dissipation layer 602. The insulating heat conducting layer 601 adopts a heat conducting ceramic sheet, which is an excellent insulator and can greatly improve the heat conductivity through doping modification, and is an optimal design for balancing the insulation and heat conduction requirements in high voltage scenarios such as transformers, specifically aluminum nitride (AlN), which has high thermal conductivity, high insulation resistance and high high voltage breakdown field strength, and is commonly used for insulating heat dissipation substrates of high voltage modules and heat conducting insulating layers of high voltage bushings. In this embodiment, the bottom surface of the insulating heat conducting layer 601 is a corresponding contoured surface, which is attached to the upper surface of the gland 1 to increase the heat transfer efficiency. Further, the temperature difference power generation sheet 604 is located between the insulating heat conducting layer 601 and the heat dissipation layer 602, and one side of the insulating heat conducting layer 601 serves as the hot end of the temperature difference power generation sheet. When the power line clamp of this embodiment is in a working state, it will generate continuous heat, which can be quickly and efficiently transferred to the temperature difference power generation sheet 604 through the insulating heat conducting layer 601, and the insulating properties of the insulating heat conducting layer 601 can protect the temperature difference power generation sheet 604; the heat dissipation layer 602 is a plate structure and is made of a metal material such as aluminum, which is attached to the temperature difference power generation sheet and used as a cold end, and the surface is close to the ambient temperature through heat dissipation. Further, in order to significantly increase the heat dissipation efficiency, heat dissipation fins 603 are provided on the outer surface of the heat dissipation layer 602. As shown in Figure 4 and Figure 5 As shown, the electrode lead-out wire of the temperature difference power generation sheet 604 is led out from the side of the temperature difference power generation structure 6 for connection with an external signal acquisition terminal; specifically, as shown in Figure 6 The electrode lead of the temperature difference power generation sheet 604 of this embodiment is connected to the positive and negative input ports of the data acquisition card 7, and the data acquisition card 7 is serially connected with the communication module 8; the communication module 8 specifically selects RS485 and is connected with the data acquisition card 7 through a converter to convert the serial port signal of the acquisition card into an RS485 signal. Among them, the data acquisition card 7 is used to receive the voltage signal generated by the temperature difference power generation structure 6, convert it into a digital signal and send it to the communication module 8, and the communication module 8 retransmits the voltage signal of the temperature difference power generation structure to the edge computing device configured by the local power grid for power line clamp operation state judgment. In order to maintain good insulation performance and increase the safety of the structure, an insulating rubber sealing edge is provided between the side of the temperature difference power generation structure 6 and its mounting position on the gland 1, as shown by the black edge area in Figures 1-3 , that is, the temperature difference power generation structure 6 is connected with the gland 1 by insulating rubber, and the gap at the edge is filled, especially at the lead position of the temperature difference power generation sheet; in this way, the insulation and sealing problem of the lead-out wire can be solved, and the high voltage electric gap creepage problem can be solved, thereby increasing the safety of the temperature difference power generation structure 6.

[0046] It should be noted that the temperature difference power generation structure 6 of the embodiment can generate electricity externally in the case where the temperature difference reaches the threshold value, so that the following functions can be achieved according to the actual situation:

[0047] Normal power clamp heating is not enough to cause the temperature difference between the two ends of the temperature difference power generation sheet to reach an effective temperature difference. For example, the threshold temperature difference of a commercially available temperature difference power generation sheet is 30°C. At this time, the electric signal generated by the temperature difference power generation sheet is a micro-volt level voltage, so the data acquisition end connected externally does not trigger the early warning mechanism.

[0048] When the power clamp abnormally heats up, a large temperature difference is generated relative to the ambient temperature, and the temperature difference is higher than the threshold temperature difference of the temperature difference power generation sheet. The temperature difference power generation structure 6 will output a voltage signal of millivolt level and above externally, so that the data acquisition end connected externally detects an effective voltage signal (higher than the preset voltage) to trigger the early warning mechanism. In combination with the current information detected by the power collection CT and other devices, it can be comprehensively judged whether the problem is a power clamp failure. Specifically, if the current is normal, it means that the power clamp is faulty. If the current is overcurrent, and the temperature difference power generation structure 6 of the power clamp no longer sends an effective voltage signal after the fault is recovered, it means that the power clamp is normal.

[0049] In the embodiment, the power clamp monitoring is realized by temperature difference power generation, which can dynamically respond to the ambient temperature, and can avoid the error problem caused by the application of temperature sensors in extreme high temperature scenarios or when there are abnormal heat sources in the installation environment. Further, the embodiment can effectively distinguish abnormal working conditions based on the working temperature characteristics of commercially available products, that is, the normal range temperature difference of the power clamp is 20-30°C, and the temperature difference of the abnormal condition of the power clamp is >35°C. The working characteristics of the conventional temperature difference power generation sheet are adapted, so that the temperature difference power generation structure 6 of the power clamp of the embodiment does not need to be additionally designed or attached.

[0050] It should also be noted that the main body of the clamp in the embodiment is a parallel groove clamp, which is intended to facilitate description and understanding. Since the power clamp commonly used for wire connection will heat up in the working state, the specific structure of the embodiment, such as the temperature difference power generation structure, can be adapted to different types of clamps after adjustment, so the specific structure of the parallel groove clamp should not be understood as a limitation of the application.

[0051] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the application, and is not a limitation on the protection scope of the application. Simple modifications or equivalent replacements of the technical solutions of the application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the application.

Claims

1. An electrical power clamp, characterized by: The temperature difference power generation structure is arranged on the surface of the gland. The gland and the holder are connected by a fixing bolt, and the gland and the holder are each provided with a wire slot. The fixing bolt is matched with a limiting groove on the top surface of the compression strip. The bottom surface of the compression strip is a profiled curved surface and is matched with the upper surface of the gland.

2. The electrical power clamp of claim 1, wherein: The surface of the gland is further attached with the temperature difference power generation structure.

3. The electrical power clamp of claim 1, wherein: The temperature difference power generation structure is a multi-layer structure and is provided with at least an insulating heat-conducting layer, a temperature difference power generation sheet and a heat dissipation layer.

4. The electrical power clamp of claim 1, wherein: The insulating heat-conducting layer is a heat-conducting ceramic sheet.

5. The electrical power clamp of claim 1, wherein: The surface of the heat dissipation layer is provided with heat dissipation fins. An insulating rubber sealing edge is arranged between the side edge of the temperature difference power generation structure and the temperature difference power generation structure mounting position.

6. The electrical power clamp of claim 1, wherein: The upper surface of the gland is a cylindrical surface structure. The lower part of the gland is provided with two symmetrical convex parts, and the end surface of each convex part is provided with the wire slot.

7. The electrical power clamp of claim 1, wherein: When the gland is matched with the holder, the wire slot of the gland is located inside the wire slot of the holder.

8. The electrical power clamp of claim 1, wherein: The upper part of the holder is provided with two parallel wire slots which respectively embrace the cable of the wire slot of the gland. A convex platform is arranged between the two wire slots.

9. The electrical power clamp of claim 1, wherein: The convex platform is provided with a plurality of connecting through holes which penetrate up and down, and the fixing bolt is installed in the connecting through hole. The lower surface of the holder is a plane structure, and an open elastic washer and a gasket are sequentially arranged between the nut of the fixing bolt and the holder.

10. The electrical power clamp of claim 1, wherein: The surface of the wire slot and the edge of the wire slot are provided with a copper layer. At least part of the wire slot is provided with a tooth-shaped anti-skid structure, and the tooth top of the tooth-shaped anti-skid structure is not higher than the adjacent wire slot surface. The upper surface of the gland is a cylindrical arc-shaped curved surface, and the bottom surface of the compression strip is an inwardly recessed arc-shaped curved surface. The vertex of the bottom surface of the compression strip is higher than the vertex of the upper surface of the gland. The electrode of the temperature difference power generation sheet of the temperature difference power generation structure is externally connected with a communication module through a wire for receiving the voltage signal of the temperature difference power generation sheet and forwarding to the edge computing device.

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