Modular combined insulator assembly for power equipment

Abstract

The invention discloses a modular combined insulator assembly for power equipment, and relates to the technical field of power equipment. The modularized combined type insulator assembly for the power equipment comprises umbrella skirts, the umbrella skirts are sequentially divided into a high-voltage end umbrella skirt, a medium-voltage end umbrella skirt and a low-voltage end umbrella skirt from near to far from a high-voltage wire, and the modularized combined type insulator assembly further comprises electret groups which are arranged in the umbrella skirts and generate surface mechanical waves under the action of an electric field, and the electret groups are connected with the high-voltage end umbrella skirt, the medium-voltage end umbrella skirt and the low-voltage end umbrella skirt. And the umbrella skirts are excited to resonate to remove stains. A natural electric field of a high-voltage wire is used for driving an electret group to vibrate, umbrella skirts are excited to resonate to generate shearing force to strip stains, zero-energy-consumption self-cleaning is achieved, electric field attenuation from a high-voltage end to a low-voltage end is compensated through the gradient distribution design of the electret group, the cleaning uniformity of the whole wire is ensured, meanwhile, airflow is achieved through a rotational flow guide groove in a skirt edge protection sleeve, and the cleaning efficiency is improved. Therefore, the cleaning effect of the umbrella skirt is improved and the windage yaw phenomenon of the insulator assembly is inhibited.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to a modular combined insulator assembly for power equipment. BACKGROUND

[0002] As the core insulation control of overhead transmission lines, the disc type string design of insulators increases the creepage distance through geometric optimization. Although the traditional glass / ceramic material meets the basic insulation requirements, it has inherent defects such as mechanical brittleness and easy induction of pollution flashover. In a humid environment, the conductive path formed by the pollution layer on the surface of the insulator leads to surface flashover. The traditional solution relies on periodic manual cleaning or live washing, which not only has high operation and maintenance costs, but also has high risk of high-altitude operation. It cannot fundamentally solve the pollution flashover problem and relies on high-cost manual maintenance.

[0003] The Chinese patent with publication number CN218159840U discloses a combined insulator structure. The device is connected to the fixed ring through the bearing outside the fixed column, and the connecting strip connected to the fixed ring is connected to the wind receiving part. At the same time, the brush holder is connected to the surface of the insulator main body. The wind receiving part is affected by the wind force, which drives the fixed ring to rotate through the transmission of the connecting strip, and the fixed ring drives the brush holder to rotate to clean the surface of the insulator main body, preventing corrosion of the insulator caused by dirt, which reduces the service life of the insulator.

[0004] The Chinese patent with publication number CN221008682U discloses a self-cleaning rod-shaped porcelain insulator. The device can fix and adjust the position of the cleaning frame through the limiting plate and the air cylinder, and the cleaning sponge can conveniently clean the surface of the insulator body. The nano glaze layer, also known as nano antibacterial self-cleaning glaze, can prevent dirt from being adsorbed on the surface of the insulator, and also facilitates the cleaning of the surface of the insulator in the later stage.

[0005] The current industry attempts to improve the anti-pollution property by adding cleaning structures or surface modifications, but all have significant limitations. The external installation of cleaning mechanisms necessarily introduces metal connecting parts or physical gaps. The additional metal parts cause local field strength concentration, accelerate insulation aging, and the gap between the brush and the insulator easily accumulates dirt, forming a "pollution bridge", which reduces the insulation strength, and the mechanical structure accumulates dirt to form a parallel conductive path, shortening the effective creepage distance. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a modular combined insulator assembly for power equipment, which solves the problems raised in the background art.

[0007] To achieve the above purpose, the present application is realized by the following technical scheme: The modular combined insulator subassembly for power equipment comprises a shed skirt, the distance from the shed skirt to the high-voltage wire is divided into high-voltage end shed skirt, medium-voltage end shed skirt and low-voltage end shed skirt from near to far, and further comprises: An electret group is arranged inside the shed skirt, which generates surface mechanical waves under the action of an electric field to excite shed skirt resonance to remove stains; A skirt edge protective sleeve is arranged at the edge of each shed skirt, and a spiral flow guide groove is arranged on the surface of the skirt edge protective sleeve to guide the surrounding air to form a cyclone on the surface of the shed skirt to enhance the stain removal effect; The skirt edge protective sleeve is provided with a groove for mounting the electret group; The number of the electret group inside the groove increases from the high-voltage end to the low-voltage end of the field strength to compensate for the attenuation of the electric field, and the thickness of the electret group decreases from the high-voltage end to the low-voltage end of the field strength to enhance the deformation sensitivity.

[0008] The surface of the electret group is covered with a FEP film, and the thickness of the FEP film decreases from the high-voltage end to the low-voltage end of the field strength.

[0009] The spiral flow guide groove is arranged on the side of the skirt edge protective sleeve away from the high-voltage wire, and the opening arc of the end of the spiral flow guide groove away from the center of the shed skirt is twice the opening arc of the other end. At least two skirt edge protective sleeves are arranged on the same shed skirt. The adjacent skirt edge protective sleeves are connected by elastic buckles to form a continuous wrapping structure for the edge of the shed skirt.

[0010] The modular combined insulator subassembly for power equipment further comprises: An optical sensor is arranged on the surface of one or more shed skirts; A signal generating element is used to receive the feedback signal of the optical sensor and control the activation and stop of the electret group.

[0011] The signal generating element comprises: A controller is used to process the optical sensor signal and output a control instruction; A power supply, which is a storage battery; A DC / AC converter is electrically connected to the power supply to convert the direct current output by the power supply into alternating current to drive the electret group.

[0012] A butyl rubber layer is arranged at the contact part of the skirt edge protective sleeve and the shed skirt.

[0013] The thickness of the FEP film covering the surface of the electret group is 0.1mm.

[0014] The modular combined insulator subassembly for power equipment further comprises a connecting piece, and the connecting piece comprises: The connecting bowl head is arranged at the center of the umbrella skirt, and a first insertion hole is arranged on one side of the connecting bowl head, and a second insertion hole is symmetrically arranged on the other side of the connecting bowl head. The inner core is fixed to the lower end of the connecting bowl head, and a notch is arranged on the outer side of the inner core close to the lower end position. The U-shaped limiting rod is inserted into the first insertion hole, and the inner side of the U-shaped limiting rod is matched with the notch for limiting the inner core, and the other end of the U-shaped limiting rod penetrates through the second insertion hole, and a fixing seat is arranged on the outer side of the connecting bowl head, and the fixing seat and the other end of the U-shaped limiting rod are connected through bolts.

[0015] The modular combined insulator assembly for power equipment further comprises: The electric connector is arranged in the inner core and is used for connecting the signal generating element. The electric connector comprises an electric connection seat arranged at the lower end of the inner core, and a carbon brush is arranged at the upper end of the electric connection seat, a moving disc is further slidably arranged in the inner core, an electric connection plug rod is fixed to the moving disc, the electric connection plug rod is electrically connected with the carbon brush, the upper end of the electric connection plug rod can be inserted into the electric connection seat of another umbrella skirt, and a rubber spring is arranged between the electric connection seat and the moving disc on the outer side of the carbon brush.

[0016] The present application has the following advantages: (1) The modular combined insulator assembly for power equipment drives the vibration of the electret group by using the natural electric field of the high-voltage wire, excites the umbrella skirt resonance to generate shear force to strip the dirt, realizes zero-energy-consumption self-cleaning, compensates the electric field attenuation from the high-voltage end to the low-voltage end through the gradient distribution design of the electret group, ensures the uniformity of the whole line cleaning, and realizes airflow through the spiral flow guide groove on the skirt edge protection sleeve to improve the umbrella skirt dirt removal effect and inhibit the wind deviation phenomenon of the insulator assembly.

[0017] (2) The modular combined insulator assembly for power equipment changes the number structure characteristics of the electret group, so that the electret group can generate sufficient and relatively consistent vibration amplitude along the whole spatial span from the high-voltage end to the low-voltage end, ensures the consistency of the vibration performance of the electret group along the electric field gradient direction, and thus maintains the overall cleaning effect.

[0018] (3) The modular combined insulator assembly for power equipment realizes real-time monitoring of the dirt degree on the umbrella skirt surface through the optical sensor, triggers the vibration of the electret group as needed through the signal generating element, excites the umbrella skirt resonance to generate shear force to strip the dirt, avoids damage to the umbrella skirt structure caused by continuous vibration, absorbs the vibration energy when the electret is embedded by using the butyl rubber layer, solves the problems of mechanical strength weakening and material fatigue risk, prolongs the service life of the umbrella skirt, and protects the edge at the same time.

[0019] (4) The modular combined insulator subassembly for power equipment, through the circumferential connection of the skirt protection sleeves at the edge of the umbrella skirt, forms a complete and continuous wrapping structure around the edge of the umbrella skirt, thereby exerting a uniform and continuous radial constraint on the edge of the umbrella skirt, effectively limiting the deformation of the edge of the umbrella skirt in the radial and circumferential directions, enhancing the overall stiffness and stability of the umbrella skirt structure, and preventing excessive deformation, cracking or even breaking of the edge of the umbrella skirt due to stress or vibration.

[0020] Of course, implementing any product of the present application does not necessarily require all the advantages described above to be achieved simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the first embodiment of the present application; Figure 2 Arrangement structure diagram of the rotational flow guide groove in the present application; Figure 3 Sectional view of the skirt protection sleeve after installation in the present application; Figure 4 Front structure diagram of the first embodiment of the present application; Figure 5 Installation structure diagram of the group of electret in the first embodiment of the present application; Figure 6 Arrangement structure diagram of the group of electret in the first embodiment of the present application; Figure 7 AC frequency change diagram in the first embodiment of the present application; Figure 8 Structure diagram of the second embodiment of the present application; Figure 9 Arrangement structure diagram of the group of electret in the second embodiment of the present application; Figure 10 Principle diagram of the second embodiment of the present application; Figure 11 Structure diagram of the connecting piece in the second embodiment of the present application; Figure 12 Internal structure diagram of the connecting piece in the second embodiment of the present application; Figure 13 Structure diagram of the electrical connector in the second embodiment of the present application.

[0022] In the figure, 1, high-voltage end umbrella skirt; 2, medium-voltage end umbrella skirt; 3, low-voltage end umbrella skirt; 4, connecting bowl head; 5, skirt edge protective sleeve; 6, spiral flow guide groove; 7, groove; 8, electret group; 9, high-voltage wire; 10, optical sensor; 11, signal generating element; 111, controller; 112, power supply; 113, DC / AC converter; 12, U-shaped limiting rod; 13, fixing seat; 14, inner core; 15, notch; 16, electrical connection seat; 17, rubber spring; 18, first socket; 19, second socket; 20, electrical connection plug rod; 21, moving disc; 22, carbon brush. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0025] The following is based on Figure 1 - Figure 13 The modular combined insulator subassembly for power equipment provided by the embodiments of the present application is described.

[0026] Embodiment one: Please refer to Figure 1 - Figure 7 The embodiments of the present application provide a technical solution: a modular combined insulator subassembly for power equipment, which comprises an umbrella skirt. The distance from the umbrella skirt to the high-voltage wire 9 is gradually increased from near to far, and is sequentially divided into a high-voltage end umbrella skirt 1, a medium-voltage end umbrella skirt 2 and a low-voltage end umbrella skirt 3. The high-voltage end umbrella skirt 1, the medium-voltage end umbrella skirt 2 and the low-voltage end umbrella skirt 3 are connected by existing conventional methods. The high-voltage end umbrella skirt 1 is close to the high-voltage wire 9, the low-voltage end umbrella skirt 3 is far away from the high-voltage wire 9, and the medium-voltage end umbrella skirt 2 is located between the two. Since the distance from the umbrella skirt to the high-voltage wire 9 gradually increases, the field strength generated by the high-voltage wire 9 gradually decreases in the high-voltage end umbrella skirt 1, the medium-voltage end umbrella skirt 2 and the low-voltage end umbrella skirt 3.

[0027] To achieve automatic cleaning of stains on the surface of the shed, the modular combined insulator assembly for power equipment provided in this embodiment also includes an electret group 8. The electret group 8 is arranged inside the shed and generates surface mechanical waves under the action of the electric field, which excites the shed to resonate and remove stains. The electret group 8 is composed of multiple electret films. The inherent high insulation and dielectric properties of the electret group 8 are utilized to enable it to provide backup insulation protection in the event of circuit breakdown, thereby preventing its damage from affecting the insulation effect of the insulator assembly.

[0028] It should be noted that the electret film is a dielectric material that can durably store space charge and dipole charge. Under the action of an alternating electric field, the bound charges inside the electret film are deformed by Maxwell stress, with the formula being δ=(σ·E) / k (δ deformation variable, σ charge density, E electric field strength, k elastic coefficient), thereby generating vibration. When the shed acts as an elastic body, the forced vibration generates bending waves, thereby achieving shed resonance. During resonance, shear stress is generated on the surface of the shed, which can be used to peel off the stain layer on its surface. It should be further noted that although the shed will change the electric field distribution, according to Maxwell stress tensor theory, the surface of the electret film will still be affected by the electric field force. The insulating medium does not block the electric field, but only changes its distribution form.

[0029] In order to prevent the amplitude caused by the electret group 8 from being too large, which may cause damage to the shed, a skirt protection cover 5 is also installed on the edge of each shed. The surface of the skirt protection cover 5 is provided with a swirl guide groove 6, which is used to guide the surrounding air to form a vortex on the surface of the shed to enhance the stain removal effect, assist the efficiency of stain removal when the shed resonates, and avoid stains accumulating on the edge of the shed. In addition, since the overhead transmission line deviates from the vertical position under the action of wind, the insulator string tilts, resulting in a decrease in the gap between the conductor and the pole tower. The excessive wind deflection angle of the insulator string is the main cause of the line tripping accident. The swing amplitude of the high-voltage conductor 9 is too large under strong wind. Among them, the natural wind will form a Karman vortex street behind the insulator, generating periodic lateral force. The swirl guide groove 6 will break the large vortex into small vortexes, reduce the amplitude of the lateral force, and make part of the airflow flow along the surface of the shed to generate a damping force opposite to the wind deflection direction, thereby reducing the occurrence of wind deflection discharge.

[0030] like Figure 4 - Figure 7As shown, when the high-voltage wire 9 is an alternating current, the direction of the electric field generated at this time changes periodically with the frequency of the alternating current, which in turn causes the alternating electrostatic force to continuously work on the electret group 8, thereby realizing the vibration of the electret group 8. In the present scheme, the skirt protection sleeve 5 is provided with a groove 7 for installing the electret group 8 to avoid embedding the electret group 8 inside the umbrella skirt. Since the electret group 8 will continue to vibrate uncontrollably under the alternating electric field, if it is embedded inside the umbrella skirt, this vibration will force the umbrella skirt to resonate synchronously, and long-term effects may cause mechanical damage such as fatigue and cracking of the umbrella skirt material. The present scheme installs the electret group 8 in the groove 7 in the skirt protection sleeve 5, so that it continuously vibrates under the action of the alternating electric field of the high-voltage wire 9 to clean the dirt on the surface of the umbrella skirt. At the same time, by using this structure to isolate the electret group 8 from the umbrella skirt main body, the mechanical damage caused by the harmful resonance of the umbrella skirt due to the uncontrollable vibration of the electret group 8 is effectively avoided. Although the vibration is weakened by isolation, the groove 7 is located at the edge of the umbrella skirt, and the continuous vibration of the electret group 8 itself can still effectively clean the dirt on the surface of the umbrella skirt through resonance, preventing the accumulation of dirt affecting the insulating performance of the umbrella skirt.

[0031] In addition, since the electric field strength near the high-voltage wire 9 will decay and weaken as it moves away from the high-voltage wire 9 (usually from the high-voltage end to the low-voltage end), this will cause the electrostatic force received by the electret group 8 at different positions to be different, which in turn affects the vibration amplitude. That is, if the electret group 8 is uniformly distributed throughout the structure, the electret group 8 in the area with weaker electric field (far from the high-voltage end) may vibrate weakly due to insufficient driving force, thereby affecting the dirt cleaning effect of the umbrella skirt in this area. To avoid this situation, the number of electret groups 8 inside the groove 7 increases from the high-voltage end to the low-voltage end of the field strength, and the number of force points is increased to compensate for the reduction of electrostatic force on the area of a single electret sheet, so that the total driving force in this area is maintained or close to the level of the high-voltage end area, to compensate for the natural decay of electric field strength due to different spatial positions. In addition, the thickness of the electret group 8 decreases from the high-voltage end to the low-voltage end of the field strength to enhance the deformation sensitivity. In areas with weaker electric fields, reducing the thickness of each electret sheet structure makes it easier to deform under the same size of electrostatic force, i.e. it improves its sensitivity to weak electric fields. This ensures that even in the weak electric field area after decay, the electret group 8 can produce effective deformation, so that the electret group 8 can produce sufficient and relatively consistent vibration amplitude along the entire spatial span from the high-voltage end to the low-voltage end, ensuring the consistency of the vibration performance of the electret group 8 along the electric field gradient, thereby maintaining the overall cleaning effect.

[0032] As shown, Figure 6As shown, the electret group 8 is covered with FEP film, and the thickness of the FEP film decreases from the high-voltage end to the low-voltage end, so as to weaken the insulation shielding effect of the weak electric field area, improve the static force transmission efficiency, and further synergistically and optimally improve the overall vibration excitation effect of the electret group 8 along the electric field gradient direction.

[0033] It should be noted that FEP (fluorinated ethylene propylene copolymer) is an excellent electret material or coating material, and its core characteristic is that it can store surface charge or capture internal charge for a long time and stably, which is crucial for the vibration mechanism of the electret sheet driven by static electricity, and ensures that the device can work continuously and effectively throughout its life cycle, avoids performance degradation caused by charge leakage, has high charge retention capability, in addition, FEP has excellent ultraviolet resistance, high and low temperature resistance, chemical corrosion resistance and moisture resistance, which enables the electret group 8 covered with FEP film to adapt to the harsh outdoor environment of the power grid equipment (such as sunlight, rain, temperature change, industrial or salt spray pollution, etc.), and maintain its physical integrity and electrical performance for a long time, especially the charge retention capability, to ensure the reliability and service life of the system.

[0034] As shown in Figure 1 - Figure 3 As shown in

[0035] In addition, in order to better clean the surface stains of the shed, the opening arc of the far end of the spiral flow guide groove 6 is twice that of the other end, and by expanding the opening at the far end, the airflow capturing capacity of the spiral flow guide groove 6 is enhanced. After the natural wind enters the spiral flow guide groove 6, it is accelerated by the narrow end and forms a high-speed directional whirlwind. The whirlwind flows closely to the surface of the shed, absorbs suspended stain particles and blocks the stain from reattaching to the surface of the shed, assisting the vibration cleaning of the electret group 8. In addition, the spiral flow guide groove 6 guides part of the airflow to flow along the axial direction of the shed, generating an aerodynamic damping force opposite to the wind deflection direction, and the spiral flow destroys large-scale transverse vortices, reduces the periodic wind load on the shed, and suppresses the swing amplitude, thereby reducing the wind deflection discharge phenomenon.

[0036] As shown in Figure 1 - Figure 5As shown, in order to improve the protection effect of the umbrella skirt edge, at least two groups of skirt edge protection sleeves 5 are provided on the same umbrella skirt, and adjacent skirt edge protection sleeves 5 are connected by elastic buckles. This connection method is a prior art and will not be described here. The buckle connection facilitates the quick assembly of the skirt edge protection sleeve 5 and is conducive to its installation and maintenance. In addition, through the buckle connection, the originally independent skirt edge protection sleeves 5 are connected head to tail in the circumferential direction of the umbrella skirt edge to form a complete and continuous wrapping structure that surrounds the umbrella skirt edge, thereby exerting a uniform and continuous radial restraint force on the umbrella skirt edge, effectively limiting the deformation of the umbrella skirt edge in the radial and circumferential directions, and enhancing the overall stiffness and stability of the umbrella skirt structure. This is crucial for resisting wind load, ice load, mechanical stress, and vibration of the internal electret group 8, and can prevent the umbrella skirt edge from excessive deformation, cracking, or even breaking due to stress or vibration.

[0037] As shown in Figure 1 and Figure 4 The modular combined insulator assembly for power equipment provided by the embodiment further includes a core rod arranged at the center of the umbrella skirt for fixedly connecting adjacent two umbrella skirts as the core load-bearing structure of the insulator assembly. The core rod can be an integrated insulating rod structure or a metal pin connector. It should be noted that an insulating filler is arranged at the connection between the core rod and the umbrella skirt. The insulating filler not only ensures electrical insulation reliability but also has comprehensive functions of sealing and moisture-proof, stress buffering, and optimizing interface bonding to ensure long-term stable operation of the connection part under mechanical and environmental stress.

[0038] In use (during work), the core rod is fixedly penetrated through the centers of adjacent umbrella skirts, the insulating filler is filled at the connection between the core rod and the umbrella skirt to ensure sealing and insulation, and the skirt edge protection sleeve 5 is installed at the edge of the umbrella skirt through buckle connection. The electret group 8 in the groove 7 of the umbrella skirt edge is continuously vibrated by the alternating electric field generated by the high-voltage conductor 9, the umbrella skirt is resonated by mechanical wave excitation, the surface stains of the umbrella skirt are stripped by shear stress, the number of electret sheets increases in the direction from high voltage to low voltage to maintain driving force, and the thickness decreases to improve the sensitivity in the weak field area. At the same time, the rotational flow guide groove 6 on the skirt edge protection sleeve 5 guides the airflow to rotate on the surface of the umbrella skirt, enhancing the cleaning effect.

[0039] Embodiment two: Please refer to Figure 8 - Figure 13The embodiment provides a technical scheme, which is different from the embodiment one, and the difference between the embodiment and the embodiment one is that the modular combined insulator subassembly for power equipment provided by the embodiment is characterized in that the high-voltage wire 9 is an alternating current or a direct current, and the electret group 8 is uniformly embedded in the umbrella skirt.

[0040] The modular combined insulator subassembly for power equipment provided by the embodiment further comprises an optical sensor 10 and a signal generating element 11, the optical sensor 10 mainly realizes monitoring by analyzing the mutual influence of light and stains, wherein the embodiment mainly adopts a transmission type light intensity sensor, the transmitting end of which can be installed on the lower surface of the upper umbrella skirt, and the receiving end of which can be arranged on the upper surface of the adjacent lower umbrella skirt; as the stain accumulation causes the receiving end on the umbrella skirt surface to also accumulate stains, the light sensing effect of the receiving end is reduced, and then the stain condition on the umbrella skirt surface is judged; the signal generating element 11 is used for receiving the feedback signal of the optical sensor 10 and controlling the activation and stop of the electret group 8.

[0041] When the stain degree is detected to reach or be lower than the preset threshold value, the signal generating element 11 can be triggered to control the electret group 8 to work, so that the electret group 8 vibrates, the umbrella skirt resonance is excited through mechanical waves, and the stain on the umbrella skirt surface is stripped by shear stress; when the light transmittance is restored or is higher than the triggering threshold value, the signal generating element 11 can control the electret group 8 to stop working, the on-demand start-stop is realized, the umbrella skirt is prevented from being continuously affected by resonance, and the service life of the umbrella skirt is improved.

[0042] As shown in FIGS. Figure 8 and Figure 10 The signal generating element 11 provided by the embodiment comprises a controller 111, a power supply 112 and a DC / AC converter 113, wherein the controller 111 is used for processing the signal of the optical sensor 10 and outputting a control instruction, the power supply 112 is a storage battery, the power source of which can be generated by using solar energy, wind energy and the like, the DC / AC converter 113 is electrically connected with the power supply 112, converts the direct current output by the power supply 112 into alternating current to drive the electret group 8, and it needs to be noted that the DC / AC converter 113 can be selected as a transformer, which has the function of converting direct current (DC) into alternating current (AC) to drive the electret group 8 to generate continuous vibration, and also has the function of voltage boosting to ensure that the alternating current supplied to the electret group 8 has sufficient voltage and power, so as to drive the electret group 8 to generate the vibration frequency and amplitude required for effective stain cleaning.

[0043] To avoid the strong electric field near the high-voltage conductor 9 interfering with the normal operation of the signal generating element 11, prevent the risk of high-voltage breakdown, and ensure the safety of maintenance personnel and the stability of the control signal, the signal generating element 11 needs to be installed on the low-voltage side of the tower.

[0044] As shown in Figure 9 The embedding of the electret group 8 inside the umbrella skirt cuts the continuity of the umbrella skirt material, reduces the overall mechanical strength, and the continuous vibration generated by the operation of the electret group 8 directly acts on the umbrella skirt body, which may cause material fatigue damage over a long period of time. Therefore, a butyl rubber layer is provided at the contact part of the skirt edge protective sleeve 5 and the umbrella skirt, which absorbs vibration energy by its high damping property to buffer the vibration amplitude of the umbrella skirt.

[0045] As shown in Figure 9 The electret group 8 surface is covered with a FEP film with a thickness of 0.1 mm, which enables the electret group 8 covered with the FEP film to adapt to the harsh outdoor environment of the power grid equipment, maintain its physical integrity and electrical performance for a long time, especially the charge retention capability, and ensure the reliability and service life of the system.

[0046] As shown in Figures 11-13 To facilitate the connection of adjacent umbrella skirts, the scheme also includes a connecting piece for fixedly connecting two adjacent umbrella skirts. The connecting piece includes a connecting bowl head 4 arranged at the center of the umbrella skirt, which is provided with a first socket 18 on one side and a second socket 19 symmetrically arranged on the other side. The inner core 14 is fixed to the lower end of the connecting bowl head 4 at the top, and the other end can be inserted into the connecting bowl head 4 of the adjacent umbrella skirt. The outer side of the connecting bowl head 4 is provided with a slot 15, and the slot 15 is an annular groove. A U-shaped limiting rod 12 is arranged inside the connecting bowl head 4, which is inserted into the first socket 18, and the inner side cooperates with the slot 15 to limit the inner core 14. The other end of the U-shaped limiting rod 12 penetrates the second socket 19, and the outer side of the connecting bowl head 4 is provided with a fixing seat 13, which is connected with the other end of the U-shaped limiting rod 12 through bolts for fixing the U-shaped limiting rod 12, thereby fixing the connecting bowl head 4 and the U-shaped limiting rod 12.

[0047] Due to the rigidity of the mechanical connection, under the influence of gravity or external force after connection, mechanical gaps are prone to occur. In order to avoid the mechanical gaps leading to the decline of the stability of the electrical signal output by the signal generating element 11, the connecting piece provided in the embodiment further comprises an electrical connector, which is arranged inside the inner core 14 and is used to connect the signal generating element 11. The electrical connector comprises an electrical connector seat 16 arranged at the lower end of the inner core 14. A carbon brush 22 is arranged at the upper end of the electrical connector seat 16. A moving disc 21 is further slidably arranged inside the inner core 14. An electrical connection plug rod 20 is fixedly arranged on the moving disc 21. The electrical connection plug rod 20 is electrically connected with the carbon brush 22. The upper end of the electrical connection plug rod 20 can be inserted with another electrical connector seat 16 on the umbrella skirt. A rubber spring 17 is arranged outside the carbon brush 22 between the electrical connector seat 16 and the moving disc 21.

[0048] Specifically, by inserting the inner core 14 on one of the umbrella skirts into the connecting bowl head 4 on the other umbrella skirt, the electrical connector seat 16 is inserted with the electrical connection plug rod 20. The electrical connection plug rod 20 further pushes the moving disc 21, so that the rubber spring 17 is deformed under pressure. The elastic potential energy of the rubber spring 17 can improve the stability of the connection between the electrical connector seat 16 and the electrical connection plug rod 20, so that the electrical connection plug rod 20 is always inserted into the electrical connector seat 16. Further, the gap caused by the mechanical connection is avoided to cause the decline of the signal stability. The open end of the U-shaped limiting rod 12 is inserted into the first insertion hole 18 and extends out of the second insertion hole 19. Through the cooperation of the slot 15 and the U-shaped limiting rod 12, the inner core 14 on the adjacent umbrella skirt is fixed. The U-shaped limiting rod 12 is mechanically limited by the fixed seat 13 at the extending position, so as to realize the fixed connection between the two adjacent umbrella skirts.

[0049] In use (when working), the optical sensor 10 on the surface of the umbrella skirt is used to monitor the light transmittance attenuation caused by the accumulation of stains in real time. When the stains reach the preset threshold, the signal generating element 11 starts to control: the high-power alternating current is output by the power supply 112 through the DC / AC converter 113, which drives the electret group 8 embedded in the umbrella skirt to vibrate, excites the umbrella skirt resonance, so as to make the umbrella skirt generate surface shear stress to peel off the stains. After the stains are removed, the machine is automatically stopped to avoid damage to the structure caused by continuous vibration. The FEP film covering the surface of the electret group 8 is used to protect the environmental stability. The butyl rubber layer on the skirt edge protective sleeve 5 is used to buffer the transmission of internal vibration, so as to prolong the service life of the umbrella skirt.

Claims

1. A modular combined power equipment insulator assembly, comprising sheds, wherein the distances between the sheds and the high-voltage conductor (9) are sequentially divided into a high-voltage end shed (1), a medium-voltage end shed (2), and a low-voltage end shed (3), from near to far, and characterized in that: Also includes: An electret group (8), the electret group (8) being arranged inside the shed and generating surface mechanical waves under the action of an electric field to excite resonance of the shed; A skirt protection sleeve (5) is provided on the edge of each umbrella skirt and has a swirl guide groove (6) on its surface; The skirt protective sleeve (5) is provided with a groove (7) for mounting an electret group (8); The number of the electret groups (8) inside the groove (7) increases in a direction from the high-voltage end to the low-voltage end of the field strength to compensate for electric field attenuation, and the thickness of the electret groups (8) decreases in a direction from the high-voltage end to the low-voltage end of the field strength to enhance deformation sensitivity.

2. The modular combined insulator assembly for electric power equipment according to claim 1, characterized in that: The surface of the electret group (8) is covered with an FEP film, and the thickness of the FEP film decreases along the direction from the high-voltage end to the low-voltage end of the field intensity.

3. The modular combined insulator assembly for electric power equipment according to claim 2, characterized in that: The swirl guide groove (6) is provided on a side of the skirt protective sleeve (5) facing away from the high-voltage conductor (9), and the opening arc of one end of the swirl guide groove (6) away from the center of the umbrella skirt is twice the opening arc of the other end; At least two sets of skirt edge protection sleeves (5) are provided on the same umbrella skirt; Adjacent skirt edge protective sleeves (5) are connected via elastic buckles to form a continuous wrapping structure for the edge of the umbrella skirt.

4. The modular combined insulator assembly for electric power equipment according to claim 1, characterized in that: Also includes: An optical sensor (10) is provided on one or more shed surfaces; The signal generating element (11) is used to receive the feedback signal of the optical sensor (10) and control the activation and deactivation of the electret group (8).

5. The modular combined insulator assembly for electric power equipment according to claim 4, characterized in that: The signal generating element (11) comprises: A controller (111) for processing signals from the optical sensor (10) and outputting control instructions; A power source (112), wherein the power source (112) is a battery; The DC / AC converter (113) is electrically connected to the power supply (112) and converts the direct current output by the power supply (112) into alternating current to drive the electret group (8).

6. The modular combined insulator assembly for electric power equipment according to claim 5, characterized in that: A butyl rubber layer is provided at the contact portion between the skirt protective cover (5) and the umbrella skirt.

7. The modular combined insulator assembly for electric power equipment according to claim 6, characterized in that: The thickness of the FEP film covering the surface of the electret group (8) is 0.1 mm.

8. The modular combined insulator assembly for electric power equipment according to claim 5, characterized in that: Also included is a connecting piece, the connecting piece comprising: A connecting bowl head (4) is provided at the center of the umbrella skirt, with a first socket (18) provided on one side and a second socket (19) provided symmetrically on the other side; An inner core (14) is fixed to the lower end of the connecting bowl head (4), and a notch (15) is provided on the outer side thereof near the lower end; The U-shaped limiting rod (12) is inserted into the first socket (18), and its inner side cooperates with the notch (15) to limit the inner core (14). The other end of the U-shaped limiting rod (12) passes through the second socket (19). A fixing seat (13) is installed on the outer side of the connecting bowl head (4). The fixing seat (13) and the other end of the U-shaped limiting rod (12) are connected by bolts.

9. The modular combined insulator assembly for electric power equipment according to claim 8, characterized in that: Also includes: An electrical connector, disposed inside the inner core (14) and used for connecting to the signal generating element (11); The electrical connector includes an electrical connection seat (16) arranged at the lower end of the inner core (14), a carbon brush (22) is provided at the upper end of the electrical connection seat (16), a movable disk (21) is slidably installed inside the inner core (14), an electrical connection plug rod (20) is fixed on the movable disk (21), the electrical connection plug rod (20) is electrically connected to the carbon brush (22), and the upper end of the electrical connection plug rod (20) can be plugged into the electrical connection seat (16) on another umbrella skirt, and a rubber spring (17) is installed on the outer side of the carbon brush (22) between the electrical connection seat (16) and the movable disk (21).

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