A strain clamp shunt model and a monitorable early warning shunt system suitable

Abstract

The present application relates to the technical field of power transmission line, in particular to a strain clamp shunt model and a monitorable early warning shunt system suitable for the same, which provides a composite shunt wire group containing a flexible current lead wire and an optical fiber current lead wire, and a strain clamp shunt model is formed by the group, in the model, the main shunt wire has lower impedance, so that most of the shunt current flows through the main shunt wire, and a small part of the current flows through the auxiliary shunt wire, which can avoid the overheat damage of the main shunt wire. Compared with the hard current lead strip structure in the prior art, the flexible current lead wire has smaller twisting pitch and softer twisted wire, and the structure is stable, the strands are not loose, and the wire does not jump when bending. The optical fiber current lead wire is connected in parallel with the flexible current lead wire in equal potential, and based on the Bragg grating fiber structure, when the flexible current lead wire changes greatly under external stress, the change can be converted into the wavelength change of grating reflection, and the change is transmitted to the external remote platform based on the monitoring and early warning module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission lines, in particular to a strain clamp shunt model and a suitable monitorable early warning shunt system. BACKGROUND

[0002] The strain clamp is a key node hardware used to fix the conductor, bear the conductor tension, and connect the conductor with the hardware string and the tower. In overhead lines, the strain clamp can be divided into bolt-type strain, pressure-type strain, pre-stranded strain, wedge-type strain, etc. according to the type of clamp. Only the pressure-type strain clamp bears the mechanical load of the conductor and the electrical load of the conductor. The pressure-type strain clamp is also the most commonly used type in domestic and foreign power transmission lines.

[0003] The pressure-type strain clamp needs to bear the current, and will inevitably heat after passing through the current. Therefore, the overheating of the pressure-type strain clamp is a common defect in the operation of the power transmission line. Abnormal heating often indicates that the strain clamp lacks current-carrying capacity, and continuous high temperature can accelerate the aging of the hardware, leading to a decline in hardware performance and ultimately causing more serious accidents.

[0004] To solve this problem, a lead strip is usually used. The lead strip is a hardware used to connect the conductor and the jumper at the strain clamp and conduct the current operation. After installing the lead strip, the current-carrying path between the conductor and the jumper is increased, which can share the operating current through the lead strip, reduce the heating of the clamp, and reduce the probability of other problems caused by clamp overheating.

[0005] The Chinese patent with publication number CN218161703U provides a power transmission line strain safety backup clamp, wherein the shunt clamp is a lead strip structure that can complete the current conduction operation. However, on the one hand, it uses a pre-stranded shunt clamp, which is a relatively hard structure that can easily pull the conductor and the jumper during use. On the other hand, the lead strip structure inevitably has increased impedance due to mechanical damage or oxidation during actual use, resulting in local overheating. Therefore, regular maintenance and inspection of facilities in the jurisdiction are usually required, but such maintenance and inspection have a certain periodicity and lag for some sudden abnormalities. SUMMARY

[0006] The purpose of the present application is to provide a strain clamp shunt model and a suitable monitorable early warning shunt system to solve the above problems.

[0007] The technical solution adopted by the present application is as follows: a strain clamp shunt model, comprising a strain clamp, one end of the strain clamp being connected with a main conductor, and the other end of the strain clamp being connected with a jumper, wherein a first connecting clamp is clamped on the main conductor;

[0008] The jumper is clamped with a second connecting wire clamp;

[0009] A composite shunt wire group is connected between the first connecting wire clamp and the second connecting wire clamp;

[0010] The composite shunt line group includes a main shunt line and an auxiliary shunt line, and the two are laid in parallel and connected with equipotential;

[0011] The main shunt line is used to share the operating current between the main line and the jumper line;

[0012] The secondary shunt line has a higher impedance than the main shunt line and is used to share the operating current between the main shunt line and the jumper line, and to monitor the strain and temperature changes of the main shunt line.

[0013] Optionally, the main shunt line is a flexible drainage line, and the auxiliary shunt line is an optical fiber drainage line;

[0014] The optical fiber drain line comprises a Bragg grating optical fiber, a metal conductive shielding layer and an outer sheath from the inside to the outside;

[0015] A grating with periodic refractive index variation is inscribed in the Bragg grating optical fiber by ultraviolet laser, and when the grating is subjected to tension or temperature changes, the grating reflection wavelength will shift;

[0016] The metal conductive shielding layer is wrapped around the outer periphery of the Bragg grating optical fiber and can be connected to the first connecting wire clamp and the second connecting wire clamp;

[0017] The outer sheath is wrapped around the outer periphery of the metal conductive shielding layer.

[0018] The present application also provides a monitoring and early warning shunt system applicable to the tension clamp based on the shunt model of the tension clamp, wherein the main shunt line and the auxiliary shunt line are provided with a monitoring and early warning module, and the monitoring and early warning module is provided with a Hall element, an amplifier circuit and a magnetic core;

[0019] The magnetic core is an open-loop structure, the magnetic core surrounds the outer periphery of the flexible drainage line, and the center of the magnetic core overlaps the center of the flexible drainage line;

[0020] The Hall element is arranged at the opening of the magnetic core and is connected to the amplifier circuit;

[0021] The signal output end of the amplifying circuit is connected to the remote platform signal.

[0022] Optionally, a photoelectric conversion structure is provided in the monitoring and early warning module, and the photoelectric conversion structure is inserted into the optical fiber drainage line and connected to the Bragg grating optical fiber, which can convert the optical signal of the Bragg grating optical fiber into an electrical signal and transmit it to the remote platform.

[0023] Optionally, the first connecting wire clamp and the second connecting wire clamp have the same structure, and both include a connecting wire clamp mechanism.

[0024] Optionally, the connecting wire clamp mechanism includes a clamping portion, a pressing block portion, a connecting portion and a pressing tube;

[0025] The lower end of the clamping part is connected to one end of the connecting part, and one side of the clamping part is detachably connected to the pressing block part through a connecting component;

[0026] A clamping cavity is provided between the pressing block portion and the clamping portion, and a conductor can be placed in the clamping cavity;

[0027] The other end of the connecting part is connected to one end of the crimping tube, and the other end of the crimping tube is provided with an insertion cavity, and the flexible drainage wire and the optical fiber drainage wire can be inserted into the insertion cavity, and the flexible drainage wire and the optical fiber drainage wire can abut against the connecting terminal of the insertion cavity.

[0028] Optionally, the connecting component includes a first connecting unit and a second connecting unit, and the clamping cavity is located between the first connecting unit and the second connecting unit;

[0029] The clamping cavity is circular, and includes a first semicircular cavity and a second semicircular cavity, and the first semicircular cavity and the second semicircular cavity are arranged opposite to each other;

[0030] The first semicircular cavity is provided on the clamping portion;

[0031] The second semicircular cavity is provided on the pressing block portion.

[0032] Optionally, the first connecting unit includes a first screw and a first nut;

[0033] The first screw can pass through the clamping portion and be inserted into the pressing block portion;

[0034] The first nut is arranged in the pressing block portion and can limit the position of the first screw;

[0035] The second connecting unit includes a second screw and a second nut;

[0036] The second screw can pass through the clamping portion and be inserted into the pressing block portion. The second screw is arranged parallel to the first screw. The second screw and the first screw are both covered with a disc spring, and the disc spring is located between the clamping portion and the pressing block portion.

[0037] The second nut is arranged in the pressing block portion and can limit the position of the second screw.

[0038] Optionally, the clamping portion is provided with a first limiting groove and a second limiting groove, wherein the first limiting groove is away from the connecting portion, and the second limiting groove is close to the connecting portion;

[0039] The first screw can pass through the clamping portion from the first limiting groove;

[0040] The second screw can pass through the clamping portion from the second limiting groove.

[0041] Optionally, a third limiting groove and a fourth limiting groove are provided on the pressing block portion, and the third limiting groove is away from the connecting portion, and the fourth limiting groove is close to the connecting portion;

[0042] The first screw can pass through the third limiting groove to exit the pressing block portion;

[0043] The second screw can pass through the fourth limiting groove and out of the pressing block portion;

[0044] A first nut limiting groove and a second nut limiting groove are provided in the pressing block portion, and the first nut limiting groove is close to the third limiting groove, and the second nut limiting groove is close to the fourth limiting groove;

[0045] The first screw can pass through the first nut limiting groove and then pass through the pressing block portion from the third limiting groove; the second screw can pass through the second nut limiting groove and then pass through the pressing block portion from the fourth limiting groove;

[0046] The first nut can be placed in the first nut limiting groove;

[0047] The second nut can be placed in the second nut limiting groove.

[0048] The beneficial effects of the present invention include at least one of the following:

[0049] 1. A composite shunt line group including a main shunt line and a secondary shunt line is provided, which forms a tension clamp shunt model. In this model, the main shunt line has a lower impedance, so most of the shunt current flows through it, and a small part of the current flows through the secondary shunt line. When the main shunt line is mechanically damaged or oxidized due to abnormalities, its impedance will increase, causing part of the current to flow through the secondary shunt line. This can prevent the main shunt line from overheating, and the secondary shunt line provides auxiliary protection for it.

[0050] 2. A design that combines a flexible drainage line with an optical fiber drainage line is adopted. Compared with the rigid drainage strip and other structures in the existing technology, the flexible drainage line has a smaller twisting pitch, the stranded wire is softer, the structure is stable when bent, and there is no loose strands or jumps. As a telescopic hardware connection line, it can alleviate the pulling of the jumper when the wire jumps. The optical fiber drainage line is laid in parallel with the flexible drainage line to form an equipotential connection. Based on its own Bragg grating optical fiber structure, when the flexible drainage line is subjected to a large change in external stress, it can convert this change into a change in the grating reflection wavelength, and transmit it to the external remote platform based on the monitoring and early warning module, so that the reliability of the tension clamp shunt structure can be monitored during the intervals between manual inspections.

[0051] 3. Based on the shunt model of the tension clamp, the conditions on the main shunt line and the auxiliary shunt line are monitored through the monitoring and early warning module. For the main shunt line, it can monitor the bypass current. When it increases, it can provide an early warning to prompt that the tension clamp may be broken or loose, which is convenient for inspection or maintenance personnel to quickly handle. For the auxiliary shunt line, the optical signal generated by the Bragg grating optical fiber is converted into an electrical signal through the optoelectronic conversion structure for export. This can provide multiple sets of data for remote platform operation and maintenance personnel to evaluate and determine whether maintenance or replacement is needed.

[0052] 4. In terms of the connection structure, a connecting wire clamp mechanism is provided. By setting a connecting component including a first connecting unit and a second connecting unit, the clamping part and the pressure block part can achieve the functions of tightening and preventing loosening after the wire is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic diagram of the structure of a monitoring and early warning diversion system suitable for tension clamps;

[0054] Figure 2 Set up a structural diagram for the main diversion line and the auxiliary diversion line;

[0055] Figure 3 This is a schematic diagram of a connecting wire clamp structure;

[0056] Figure 4 This is a schematic diagram of the connecting wire clamp structure from another perspective;

[0057] Figure 5 This is a schematic diagram of a monitoring and early warning module.

[0058] In the picture:

[0059] 1 is the clamping part, 2 is the pressing block part, 3 is the connecting part, 4 is the crimping tube, 5 is the insertion cavity, 6 is the first limiting groove, 7 is the second limiting groove, 8 is the third limiting groove, 9 is the fourth limiting groove, 10 is the first nut limiting groove, 11 is the second nut limiting groove, 12 is the first screw, 13 is the second screw, 14 is the first nut, 15 is the second nut, 16 is the clamping cavity, 18 is the tension clamp, 19 is the main conductor, 20 is the jumper, 21 is the first connecting wire clamp, 22 is the second connecting wire clamp, 23 is the flexible drainage wire, 24 is the monitoring and early warning module, 25 is the magnetic core, 26 is the Hall element, 27 is the optical fiber drainage wire, 28 is the connecting terminal, 29 is the first connecting sleeve, 30 is the second connecting sleeve, 31 is the Bragg grating optical fiber, 32 is the metal conductive shielding layer, 33 is the outer sheath, 34 is the photoelectric conversion structure, and 35 is the disc spring. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0062] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0063] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0064] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0065] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0066] like Figure 1As shown, a strain clamp shunt model includes a strain clamp 18, one end of the strain clamp 18 is connected to the main conductor 19, and the other end of the strain clamp 18 is connected to the jumper 20, wherein the main conductor 19 is clamped with a first connecting clamp 21;

[0067] The jumper 20 is clamped with a second connecting wire clamp 22;

[0068] A composite shunt wire group is connected between the first connecting wire clamp 21 and the second connecting wire clamp 22;

[0069] The composite shunt line group includes a main shunt line and an auxiliary shunt line, and the two are laid in parallel and connected with equipotential;

[0070] The main shunt line is used to share the operating current between the main line 19 and the jumper line 20;

[0071] The secondary shunt line has a higher impedance than the main shunt line, and is used to share the operating current between the main shunt line 19 and the jumper line 20, and to monitor the strain and temperature changes of the main shunt line.

[0072] The purpose of this design is to provide a composite shunt line group including a main shunt line and a secondary shunt line, thereby forming a tension clamp shunt model. In this model, the main shunt line has a lower impedance, so most of the shunt current flows through it, and a small part of the current flows through the secondary shunt line. When the main shunt line is mechanically damaged or oxidized due to abnormalities, its impedance will increase, causing part of the current to flow through the secondary shunt line. This can prevent the main shunt line from overheating, and the secondary shunt line provides auxiliary protection for it.

[0073] like Figure 2 As shown, the main diversion line is a flexible drainage line 23, and the auxiliary diversion line is an optical fiber drainage line 27;

[0074] The optical fiber drain line 27 comprises, from the inside to the outside, a Bragg grating optical fiber 31, a metal conductive shielding layer 32 and an outer sheath 33;

[0075] The Bragg grating fiber 31 is inscribed with a grating having a periodic refractive index change by ultraviolet laser, and when the grating is subjected to tension or temperature changes, the grating reflection wavelength will shift;

[0076] The metal conductive shielding layer 32 is wrapped around the outer periphery of the Bragg grating optical fiber 31 and can be connected to the first connecting clamp 21 and the second connecting clamp 22;

[0077] The outer sheath 33 is wrapped around the outer periphery of the metal conductive shielding layer 32 .

[0078] The purpose of such design is to adopt the design of flexible drainage wire and optical fiber drainage wire, wherein the flexible drainage wire has smaller twisting pitch, softer twisted wire, stable structure when bending, no loose strands and no wire jumping compared with the hard drainage strip structure in the prior art, and can relieve the pulling of the jumper wire when the conductor jumps. The optical fiber drainage wire is connected in equipotential with the flexible drainage wire and is laid in parallel. Based on the Bragg grating fiber structure, when the flexible drainage wire changes greatly under external stress, the change can be converted into the wavelength change of the grating reflection, and is transmitted to the external remote platform based on the monitoring and early warning module, so that the reliability of the strain clamp shunt structure can be monitored during the artificial inspection interval.

[0079] It should be noted that the flexible drainage wire has the functions of soft twisted wire, stable structure when bending, no loose strands and no wire jumping. The bending here refers to reasonable interval bending. Of course, the optical fiber drainage wire arranged in parallel will also bend, and the optical fiber will also convert the change into the wavelength change of the grating reflection. However, the change cannot exceed the set threshold value. The threshold value needs to be adjusted by the on-site staff and set based on the specific use scenario. When the threshold value is exceeded, it means that the bending deformation of the flexible drainage wire exceeds the expectation, and the inspection personnel need to be arranged to check. At the same time, the deformation may not be caused by the flexible drainage wire, but may be caused by the strain clamp. Under the current technology and reasonable cost conditions, it is difficult to distinguish through the remote platform. Therefore, the system provided in the embodiment is more to find problems, and the problem judgment and how to deal with the problems are more dependent on artificial implementation. In this way, the monitoring and early warning are realized to a great extent, and the high cost that is not practical is avoided.

[0080] In the embodiment, as shown in Figure 5 Based on the strain clamp shunt model, a monitorable and early warning shunt system suitable for the strain clamp is provided. The main shunt wire and the auxiliary shunt wire are provided with a monitoring and early warning module 24. The monitoring and early warning module 24 is provided with a Hall element 26, an amplification circuit and a magnetic core 25.

[0081] The magnetic core 25 is an open loop structure, the magnetic core 25 surrounds the outer periphery of the flexible drainage wire 23, and the center of the magnetic core 25 overlaps the center of the flexible drainage wire 23.

[0082] The Hall element 26 is arranged at the opening of the magnetic core 25, and the Hall element 26 is connected with the amplification circuit.

[0083] The signal output end of the amplification circuit is connected with the signal of the remote platform.

[0084] It should be pointed out that the monitoring and early warning module in this embodiment adopts an open-loop Hall element installation structure. Of course, those skilled in the art may also choose other sensor elements, such as closed-loop Hall elements, when implementing this solution. This is not limited in this embodiment.

[0085] In the monitoring and early warning module structure provided in this embodiment, the magnetic core has an open air gap, and the Hall element is placed in the air gap. When current flows through the flexible drainage line, a magnetic field with a magnetic field strength proportional to the current magnitude is generated around the flexible drainage line. The magnetic core gathers the magnetic lines of force at the air gap, and the Hall element outputs a voltage signal proportional to the magnetic induction intensity at the air gap. The amplifier circuit amplifies and outputs this signal. When the tension clamp breaks or loosens, the current flowing into the flexible drainage line will increase significantly. This change is fed back to the designated maintenance personnel or remote platform monitoring through wireless transmission or other means. The early warning is completed by the monitoring and early warning module. It should be pointed out that the monitoring and early warning currently provided by this embodiment mainly sends the monitoring data to the designated personnel, and the judgment is completed manually. Of course, those skilled in the art can also add an additional controller to use the existing control system to judge the current or voltage collected by the monitoring and early warning module with the set threshold, and then accurately push the alarm.

[0086] At the same time, in this embodiment, a photoelectric conversion structure 34 is provided in the monitoring and early warning module 24, and the photoelectric conversion structure 34 is inserted into the optical fiber drainage line 27 and connected to the Bragg grating optical fiber 31, which can convert the optical signal of the Bragg grating optical fiber 31 into an electrical signal and transmit it to the remote platform.

[0087] The purpose of this design is to monitor the conditions on the main shunt line and the auxiliary shunt line through the monitoring and early warning module on the basis of the tension clamp shunt model. For the main shunt line, it can monitor the bypass current. When it increases, it can provide an early warning to prompt that the tension clamp may be broken or loose, so that the inspection or maintenance staff can quickly handle it. For the auxiliary shunt line, the optical signal generated by the Bragg grating optical fiber is converted into an electrical signal through the optoelectronic conversion structure for export. This can provide multiple sets of data for the remote platform operation and maintenance personnel to evaluate and determine whether maintenance or replacement is needed.

[0088] In some specific use cases, the flexible drain wire serves as the primary path, carrying the majority of the current, typically 80% to 90%, and is directly connected to the crimped tube of the tension clamp. The optical fiber drain wire serves as a secondary path, conducting only a small portion of the current, typically 10% to 20%. However, its metal conductive shielding layer forms an equipotential connection with the flexible drain wire, preventing corrosion or arcing caused by potential differences.

[0089] When the flexible drain wire's impedance increases due to mechanical damage or oxidation, the fiber optic drain wire automatically shares more current, preventing local overheating. For example, if the flexible drain wire's resistance rises to 1.5 times its original value, the fiber optic composite wire maintains overall current diversion efficiency through its inherent low impedance.

[0090] For ease of understanding, the two can be considered as a parallel relationship. The total current I is distributed according to the ratio of their impedances R, where the resistance of the flexible drain wire is R1 and the resistance of the metal conductive shielding layer of the optical fiber drain wire is R2, that is:

[0091] ;

[0092] ;

[0093] In this way, the tension clamp is shunted through the main channel for protection, and the main channel is shunted through the auxiliary channel for protection.

[0094] In this embodiment, Figure 3 and Figure 4 As shown, this embodiment provides a specific structure of a connecting wire clamp, wherein the first connecting wire clamp 21 and the second connecting wire clamp 22 have the same structure and both include a connecting wire clamp mechanism. At the same time, the connecting wire clamp mechanism includes a clamping portion 1, a pressing block portion 2, a connecting portion 3 and a crimping tube 4;

[0095] The lower end of the clamping part 1 is connected to one end of the connecting part 3, and one side of the clamping part 1 is detachably connected to the pressing part 2 through a connecting component;

[0096] A clamping cavity 16 is provided between the pressing block portion 2 and the clamping portion 1, and a conductor can be placed in the clamping cavity 16;

[0097] The other end of the connecting portion 3 is connected to one end of the crimping tube 4, and the other end of the crimping tube 4 is provided with an insertion cavity 5, and the flexible drainage wire 23 and the optical fiber drainage wire 27 can be inserted into the insertion cavity 5, and the flexible drainage wire 23 and the optical fiber drainage wire 27 can abut against the connection terminal 28 of the insertion cavity 5.

[0098] The purpose of this design is that the insertion cavity provided on the crimping tube is used to insert the flexible drainage wire and the optical fiber drainage wire. In actual installation, the two ends of the flexible drainage wire and the optical fiber drainage wire are first inserted into the insertion cavities of the two connecting wire clamps respectively, and pushed into the bottom. Then, the crimping tube with a circular tube structure is pressed into a hexagonal prism structure by a hydraulic press to complete the clamping of the flexible drainage wire therein.

[0099] It should be pointed out that the description that a conductor can be placed in the clamping cavity 16 is a general description, which can be a main conductor or a jumper wire, depending on the needs of the usage scenario or other conductive cables.

[0100] Then combine Figure 2 For further description, in actual use, a connecting terminal is provided at the top of the insertion cavity, and the connecting terminal is connected to the connecting part 3, so that the current on both the main conductor and the jumper can be transmitted to the connecting terminal through the connecting part. At the same time, a first connecting sleeve 29 and a second connecting sleeve 30 are also provided on the connecting terminal, so that the ends of the flexible drainage line 23 and the optical fiber drainage line 27 can be inserted therein, and the size of the two connecting sleeves is slightly larger than the end size of the flexible drainage line 23 and the optical fiber drainage line 27. After the insertion is completed, crimping is performed by a segmented hydraulic method to avoid irreversible damage to the optical fiber inside the optical fiber drainage line by one-time crimping. After the crimping is completed, the performance of the optical fiber drainage line needs to be tested. Furthermore, for the optical fiber drainage line itself, the thickness of its metal conductive shielding layer is between 0.5mm and 1mm, and an insulating sleeve is provided on the outside with a thickness of more than 2mm, which can greatly reduce the lateral extrusion of the internal optical fiber by the crimping mold.

[0101] At the same time, when setting the pressure pipe 4, a straight structure can be selected. Compared with the conventional inclined structure, its center of gravity is closer to the bottom of the wire clamp. After the installation of the monitoring and early warning module is completed, the force on the connecting wire clamp is more uniform, reducing the interference of torque in other directions.

[0102] Furthermore, since the function of the connecting wire clamp provided in this embodiment is to assist the flexible drain wire in sharing the operating current, its overall structure adopts a conductive material, and aluminum alloy can be selected from the perspectives of cost and mechanical strength.

[0103] At the same time, in this embodiment, the connecting component includes a first connecting unit and a second connecting unit, and the clamping cavity 16 is located between the first connecting unit and the second connecting unit. The clamping cavity 16 is circular and includes a first semicircular cavity and a second semicircular cavity, and the first semicircular cavity is arranged opposite to the second semicircular cavity.

[0104] The first semicircular cavity is provided on the clamping portion 1;

[0105] The second semicircular cavity is provided on the pressing block portion 2 .

[0106] The purpose of this design is to use two semicircular cavities to form a full-circular cavity structure, so that when clamping, the acting force is more easily distributed on the clamping part and the pressing block part, so that the overall force is more balanced.

[0107] At the same time, this embodiment provides a specific composition of a connecting component, wherein

[0108] The first connecting unit includes a first screw 12 and a first nut 14;

[0109] The first screw 12 can pass through the clamping part 1 and be inserted into the pressing part 2;

[0110] The first nut 14 is provided in the pressing block portion 2 and can limit the first screw rod 12;

[0111] The second connecting unit includes a second screw 13 and a second nut 15;

[0112] The second screw 13 can pass through the clamping portion 1 and be inserted into the pressing portion 2. The second screw 13 is arranged parallel to the first screw 12. The second screw 13 and the first screw 12 are both covered with a disc spring 27, and the disc spring 27 is located between the clamping portion 1 and the pressing portion 2.

[0113] The second nut 15 is disposed in the pressing block portion 2 and can limit the position of the second screw rod 13 .

[0114] At the same time, the clamping portion 1 is provided with a first limiting groove 6 and a second limiting groove 7, and the first limiting groove 6 is away from the connecting portion 3, and the second limiting groove 7 is close to the connecting portion 3;

[0115] The first screw 12 can pass through the clamping portion 1 from the first limiting groove 6;

[0116] The second screw rod 13 can pass through the clamping portion 1 from the second limiting groove 7 .

[0117] Furthermore, the pressing block portion 2 is provided with a third limiting groove 8 and a fourth limiting groove 9, and the third limiting groove 8 is away from the connecting portion 3, and the fourth limiting groove 9 is close to the connecting portion;

[0118] The first screw 12 can pass through the third limiting groove 8 and out of the pressing block part 2;

[0119] The second screw rod 13 can pass through the fourth limiting groove 9 and out of the pressing block part 2 .

[0120] At the same time, a first nut limiting groove 10 and a second nut limiting groove 11 are provided in the pressing block portion 2, and the first nut limiting groove 10 is close to the third limiting groove 8, and the second nut limiting groove 11 is close to the fourth limiting groove 9;

[0121] The first screw 12 passes through the first nut limiting groove 10 and can pass through the third limiting groove 8 to exit the pressing block part 2. The second screw 13 passes through the second nut limiting groove 11 and can pass through the fourth limiting groove 9 to exit the pressing block part 2.

[0122] The first nut 14 can be placed in the first nut limiting groove 10;

[0123] The second nut 15 can be placed in the second nut limiting groove 11 .

[0124] The purpose of such design is that, on the one hand, the built-in first, second, third and fourth limiting grooves make the entire screw rod after installation, without protruding parts outside the clamping part and the pressing block part, more uniform, and not easy to be affected by external force to affect the connection stability;

[0125] On the other hand, the additional nut limiting groove is used to place the nut and prevent it from being removed by riveting, which can effectively prevent the nut from being accidentally removed.

[0126] In addition, the symmetrically distributed screw rod is used to install the wire clamp on both sides, providing uniform pressure to the wire, making the wire clamp grip more durable and reliable.

[0127] At the same time, by setting a disc spring between the clamping part 1 and the pressing block part 2, it can automatically compensate for the loosening of the wire clamp to a certain extent.

[0128] In this embodiment, during installation, the crimping tube is welded to the connecting part by argon arc welding process, and defects such as lack of welding, porosity and cracks should be avoided. Then the crimping tube and the flexible lead wire are crimped by a hydraulic machine. After crimping, the surface of the crimping tube is polished to remove burrs and burrs.

[0129] Compared with the other two kinds of wires, the super small pitch soft aluminum stranded wire has a smaller stranded pitch, is soft, and has a stable structure when bending, does not loosen the strands, and does not jump the wire, so it is often used as a flexible hardware connecting line between equipment or busbar nodes in a substation or a converter station.

[0130] Of course, those skilled in the art can choose appropriate other flexible lead wire materials according to actual conditions in actual use.

[0131] It should be noted that the flexible lead wire in this embodiment mainly functions to share operating current, and does not function to support, etc., so it needs to be used with a stable and uniformly stressed connecting wire clamp.

[0132] By setting the composite shunt line composed of the main shunt line and the auxiliary shunt line and the combination into a monitorable and early warning shunt system, the composite shunt line is significantly superior to the traditional fixed lead wire in mechanical strength, fatigue resistance and weather resistance, and meets the 20-year service life requirement of the ultra-high voltage line.

[0133] At the same time, through optical fiber data sensing and Hall current sensing, the shunt data of the entire shunt model can be monitored, and timely feedback can be realized to the remote platform to realize early warning.

[0134] Finally, under the premise of ensuring the current carrying capacity, the double-channel shunt reduces the temperature rise of the wire clamp, and is expected to reduce the line loss by 3%~5%.

[0135] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A strain clamp shunt model, comprising a strain clamp (18), one end of the strain clamp (18) being connected to a main conductor (19), and the other end of the strain clamp (18) being connected to a jumper (20), characterized in that: A first connecting wire clamp (21) is clamped on the main wire (19); A second connecting wire clamp (22) is clamped on the jumper wire (20); A composite shunt wire group is connected between the first connecting wire clamp (21) and the second connecting wire clamp (22); The composite shunt line group includes a main shunt line and an auxiliary shunt line, and the two are laid in parallel and connected with equipotential; The main shunt line is used to share the operating current between the main line (19) and the jumper line (20); The secondary shunt line has a higher impedance than the main shunt line and is used to share the operating current between the main shunt line (19) and the jumper line (20), and to monitor the strain and temperature changes of the main shunt line; The main shunt line is a flexible drainage line (23), and the auxiliary shunt line is an optical fiber drainage line (27); The optical fiber drain line (27) comprises, from the inside to the outside, a Bragg grating optical fiber (31), a metal conductive shielding layer (32), and an outer sheath (33); A grating with periodic refractive index variation is inscribed in the Bragg grating optical fiber (31) by ultraviolet laser, and when the grating is subjected to tension or temperature changes, the grating reflection wavelength will shift; The metal conductive shielding layer (32) is wrapped around the outer periphery of the Bragg grating optical fiber (31) and can be connected to the first connecting wire clamp (21) and the second connecting wire clamp (22); The outer sheath (33) is wrapped around the outer periphery of the metal conductive shielding layer (32).

2. A monitoring and early warning diversion system for tension clamps, based on the tension clamp diversion model of claim 1, characterized in that: The main shunt line and the auxiliary shunt line are provided with a monitoring and early warning module (24), wherein the monitoring and early warning module (24) is provided with a Hall element (26), an amplifying circuit and a magnetic core (25); The magnetic core (25) is an open-loop structure, the magnetic core (25) surrounds the outer periphery of the flexible drainage line (23), and the center of the magnetic core (25) overlaps with the center of the flexible drainage line (23); The Hall element (26) is provided at the opening of the magnetic core (25), and the Hall element (26) is connected to the amplifier circuit; The signal output end of the amplifying circuit is connected to the remote platform signal.

3. A monitoring and early warning shunting system suitable for tension clamps according to claim 2, characterized in that: The monitoring and early warning module (24) is provided with a photoelectric conversion structure (34), and the photoelectric conversion structure (34) is inserted into the optical fiber drainage line (27) and connected to the Bragg grating optical fiber (31), and can convert the optical signal of the Bragg grating optical fiber (31) into an electrical signal and transmit it to the remote platform.

4. A monitoring and early warning shunting system suitable for tension clamps according to claim 3, characterized in that: The first connecting wire clamp (21) and the second connecting wire clamp (22) have the same structure and both comprise a connecting wire clamp mechanism.

5. The monitoring and early warning shunting system for tension clamps according to claim 4 is characterized in that: The connecting wire clamp mechanism comprises a clamping portion (1), a pressing block portion (2), a connecting portion (3) and a pressing tube (4); The lower end of the clamping portion (1) is connected to one end of the connecting portion (3), and one side of the clamping portion (1) is detachably connected to the pressing block portion (2) via a connecting component; A clamping cavity (16) is provided between the pressing block portion (2) and the clamping portion (1), and a conductor can be placed in the clamping cavity (16); The other end of the connecting portion (3) is connected to one end of the crimping tube (4), and the other end of the crimping tube (4) is provided with an insertion cavity (5), and a flexible drainage wire (23) and an optical fiber drainage wire (27) can be inserted into the insertion cavity (5), and the flexible drainage wire (23) and the optical fiber drainage wire (27) can abut against a connection terminal (28) of the insertion cavity (5).

6. A monitoring and early warning shunting system suitable for tension clamps according to claim 5, characterized in that: The connecting component comprises a first connecting unit and a second connecting unit, and the clamping cavity (16) is located between the first connecting unit and the second connecting unit; The clamping cavity (16) is circular, and comprises a first semicircular cavity and a second semicircular cavity, wherein the first semicircular cavity and the second semicircular cavity are arranged opposite to each other; The first semicircular cavity is provided on the clamping portion (1); The second semicircular cavity is provided on the pressing block portion (2).

7. The monitoring and early warning shunting system for tension clamps according to claim 6 is characterized in that: The first connecting unit comprises a first screw (12) and a first nut (14); The first screw (12) can pass through the clamping portion (1) and be inserted into the pressing block portion (2); The first nut (14) is arranged in the pressing block portion (2) and can limit the position of the first screw rod (12); The second connecting unit comprises a second screw (13) and a second nut (15); The second screw (13) can pass through the clamping portion (1) and be inserted into the pressing portion (2). The second screw (13) is arranged in parallel with the first screw (12). The second screw (13) and the first screw (12) are both sleeved with a disc spring (27), and the disc spring (27) is located between the clamping portion (1) and the pressing portion (2). The second nut (15) is arranged in the pressing block portion (2) and can limit the position of the second screw rod (13).

8. The monitoring and early warning shunting system for tension clamps according to claim 7 is characterized in that: The clamping portion (1) is provided with a first limiting groove (6) and a second limiting groove (7), wherein the first limiting groove (6) is away from the connecting portion (3), and the second limiting groove (7) is close to the connecting portion (3); The first screw (12) can pass through the clamping portion (1) from the first limiting groove (6); The second screw (13) can pass through the clamping portion (1) from the second limiting groove (7).

9. The monitoring and early warning shunting system for tension clamps according to claim 8, characterized in that: The pressing block portion (2) is provided with a third limiting groove (8) and a fourth limiting groove (9), wherein the third limiting groove (8) is away from the connecting portion (3) and the fourth limiting groove (9) is close to the connecting portion; The first screw (12) can pass through the pressing block portion (2) from the third limiting groove (8); The second screw (13) can pass through the pressing block portion (2) from the fourth limiting groove (9); A first nut limiting groove (10) and a second nut limiting groove (11) are provided in the pressing block portion (2), and the first nut limiting groove (10) is close to the third limiting groove (8), and the second nut limiting groove (11) is close to the fourth limiting groove (9); After the first screw rod (12) passes through the first nut limiting groove (10), it can pass through the third limiting groove (8) to exit the pressing block part (2); after the second screw rod (13) passes through the second nut limiting groove (11), it can pass through the fourth limiting groove (9) to exit the pressing block part (2); The first nut (14) can be placed in the first nut limiting groove (10); The second nut (15) can be placed in the second nut limiting groove (11).

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