Modular composite insulator assembly for electrical equipment

Abstract

The application discloses a modular combined insulator subassembly for power equipment and relates to the technical field of power equipment.The modular combined insulator subassembly for power equipment comprises umbrella skirts, the distance of the umbrella skirts to high-voltage conductors is divided into high-voltage end umbrella skirts, medium-voltage end umbrella skirts and low-voltage end umbrella skirts from near to far, and further comprises an electret group, the electret group is arranged in the umbrella skirts and generates surface mechanical waves under the action of an electric field, and the umbrella skirts are excited to resonate to remove dirt.The natural electric field of the high-voltage conductors is utilized to drive the electret group to vibrate, the umbrella skirts are excited to resonate to generate shearing force to strip off the dirt, zero-energy-consumption self-cleaning is realized, the gradient distribution design of the electret group is adopted to compensate for the electric field attenuation from the high-voltage end to the low-voltage end, and the cleaning uniformity of the whole line is ensured, meanwhile, the airflow is realized through the spiral flow guide grooves on the skirt edge protection sleeve, the umbrella skirt cleaning effect is improved, and the wind deviation phenomenon of the insulator subassembly 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 the corrosion of dirt to the insulator and reducing 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" that reduces the insulation strength. 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:

[0008] 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:

[0009] 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;

[0010] 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;

[0011] The skirt edge protective sleeve is provided with a groove for mounting the electret group;

[0012] 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.

[0013] 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.

[0014] 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.

[0015] At least two skirt edge protective sleeves are arranged on the same shed skirt;

[0016] The adjacent skirt edge protective sleeves are connected by elastic buckles to form a continuous wrapping structure for the edge of the shed skirt.

[0017] The modular combined insulator subassembly for power equipment further comprises:

[0018] An optical sensor is arranged on the surface of one or more shed skirts;

[0019] 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.

[0020] The signal generating element comprises:

[0021] A controller is used to process the optical sensor signal and output a control instruction;

[0022] A power supply, which is a storage battery;

[0023] 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.

[0024] The skirt edge protective sleeve is provided with a butyl rubber layer at the position in contact with the umbrella skirt.

[0025] The FEP film covering the surface of the electret group has a thickness of 0.1 mm.

[0026] The modular combined insulator assembly for power equipment further comprises a connecting piece, the connecting piece comprising:

[0027] The connecting bowl head is provided with a first socket on one side and a second socket symmetrically provided on the other side;

[0028] The inner core is fixed to the lower end of the connecting bowl head, and a notch is provided on the outer side of the inner core close to the lower end position;

[0029] The U-shaped limiting rod is inserted into the first socket, and the inner side of the U-shaped limiting rod cooperates with the notch for limiting the inner core, the other end of the U-shaped limiting rod penetrates through the second socket, and a fixing seat is installed 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.

[0030] The modular combined insulator assembly for power equipment further comprises:

[0031] The electric connector is arranged in the inner core and used for connecting the signal generating element;

[0032] The electric connector comprises an electric connection seat arranged at the lower end of the inner core, a carbon brush is arranged at the upper end of the electric connection seat, a moving disc is 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.

[0033] The present application has the following beneficial effects:

[0034] (1) The modular combined insulator assembly for power equipment drives the electret group to vibrate 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 the airflow through the spiral flow guide groove on the skirt edge protective sleeve to improve the umbrella skirt dirt cleaning effect and inhibit the wind deviation phenomenon of the insulator assembly.

[0035] (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.

[0036] (3) The modular combined insulator assembly for power equipment monitors the degree of dirt on the umbrella skirt surface in real time through an optical sensor, triggers the on-demand start of the vibration of the group of electret bodies through a signal generating element, excites the umbrella skirt resonance to generate shear force to strip the dirt, avoids continuous vibration damage to the umbrella skirt structure, absorbs the vibration energy when the electret is embedded by using the butyl rubber layer, solves the weakening of mechanical strength and the risk of material fatigue, prolongs the service life of the umbrella skirt, and ensures edge protection while isolating harmful vibrations.

[0037] (4) The modular combined insulator assembly for power equipment, through the circumferential connection of the skirt edge protective sleeve at the edges of the umbrella skirt, forms a complete, continuous wrapping structure around the edges of the umbrella skirt, thereby exerting a uniform, continuous radial restraint on the edges of the umbrella skirt, effectively limiting the deformation of the edges of the umbrella skirt in the radial and circumferential directions, enhancing the overall stiffness and stability of the umbrella skirt structure, and preventing the edges of the umbrella skirt from deforming, cracking, or even breaking due to stress or vibration.

[0038] Of course, implementing any product of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The structure schematic diagram of the embodiment one of the present application;

[0040] Figure 2 The arrangement structure schematic diagram of the rotational flow guide groove in the present application;

[0041] Figure 3 The cross-sectional view of the skirt edge protective sleeve after installation in the present application;

[0042] Figure 4 The front structure schematic diagram of the embodiment one of the present application;

[0043] Figure 5 The installation structure schematic diagram of the group of electret bodies in the embodiment one of the present application;

[0044] Figure 6 The arrangement structure schematic diagram of the group of electret bodies in the embodiment one of the present application;

[0045] Figure 7 The alternating current frequency change diagram in the embodiment one of the present application;

[0046] Figure 8 The structure schematic diagram of the embodiment two of the present application;

[0047] Figure 9 The arrangement structure schematic diagram of the group of electret bodies in the embodiment two of the present application;

[0048] Figure 10 The principle diagram of the embodiment two of the present application;

[0049] Figure 11 Fig. 2 is a structural schematic diagram of the connecting piece in the second embodiment of the present application;

[0050] Figure 12 Fig. 3 is a structural schematic diagram of the internal structure of the connecting piece in the second embodiment of the present application;

[0051] Figure 13 Fig. 4 is a structural schematic diagram of the electrical connector in the second embodiment of the present application.

[0052] In the figure, 1 is a high-voltage end umbrella skirt; 2 is a medium-voltage end umbrella skirt; 3 is a low-voltage end umbrella skirt; 4 is a connecting bowl head; 5 is a skirt edge protective sleeve; 6 is a rotational flow guide groove; 7 is a groove; 8 is an electret group; 9 is a high-voltage wire; 10 is an optical sensor; 11 is a signal generating element; 111 is a controller; 112 is a power supply; 113 is a DC / AC converter; 12 is a U-shaped limiting rod; 13 is a fixing seat; 14 is an inner core; 15 is a notch; 16 is an electrical connection seat; 17 is a rubber spring; 18 is a first socket; 19 is a second socket; 20 is an electrical connection plug rod; 21 is a moving disc; 22 is a carbon brush. DETAILED DESCRIPTION

[0053] 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] 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 used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the indicated component or element 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.

[0055] The following will be described according to Figure 1 Figure 13 The modular combined insulator assembly for power equipment provided by the embodiments of the present application is described.

[0056] Embodiment I:

[0057] Please refer to Figure 1 Figure 7 ​​The embodiment of the application provides a technical scheme: a modular combined insulator assembly for power equipment, comprising an umbrella skirt, the distance from the umbrella skirt to a high-voltage wire 9 is gradually increased, and the umbrella skirt is divided into a high-voltage end umbrella skirt 1, a medium-voltage end umbrella skirt 2 and a low-voltage end umbrella skirt 3 from near to far, the high-voltage end umbrella skirt 1, the medium-voltage end umbrella skirt 2 and the low-voltage end umbrella skirt 3 are connected through an existing conventional mode, wherein 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 between the high-voltage end umbrella skirt 1 and the low-voltage end umbrella skirt 3, so that the field strength generated by the high-voltage wire 9 is gradually reduced in the high-voltage end umbrella skirt 1, the medium-voltage end umbrella skirt 2 and the low-voltage end umbrella skirt 3.

[0058] In order to realize automatic cleaning of the stains on the surface of the umbrella skirt, the modular combined insulator assembly for power equipment provided by the embodiment further comprises an electret group 8, the electret group 8 is arranged in the umbrella skirt and generates surface mechanical waves under the action of an electric field to excite resonance of the umbrella skirt to remove stains, wherein the electret group 8 is composed of a plurality of electret films, the inherent high insulation and dielectric properties of the electret group 8 are used, so that the electret group 8 can still provide backup insulation protection when a circuit is broken down, and the influence of damage of the electret group 8 on the insulation effect of the insulator assembly is avoided.

[0059] It should be noted that the electret film is a dielectric material capable of storing space charge and dipole charge for a long time, under the action of an alternating electric field, the bound charges in the electret film are deformed under the action of Maxwell stress, the formula is delta=(sigma*E) / k (delta deformation variable, sigma charge density, E electric field strength, k elastic coefficient), so that vibration is generated, when the umbrella skirt is used as an elastic body, forced vibration is generated to generate bending waves, so that resonance of the umbrella skirt is realized, shear stress is generated on the surface of the umbrella skirt during resonance, and the stain layer on the surface of the umbrella skirt can be peeled off, it should be further noted that although the umbrella skirt changes the distribution of the electric field, according to the Maxwell stress tensor theory, the surface of the electret film is still subjected to the action of the electric field force, the insulating dielectric does not interrupt the electric field, and only changes the distribution mode of the electric field.

[0060] In order to prevent the amplitude caused by the electret group 8 from being too large and causing damage to the umbrella skirt, a skirt edge protection sleeve 5 is further arranged at the edge of each umbrella skirt, the surface of the skirt edge protection sleeve 5 is provided with a rotational flow guide groove 6, the rotational flow guide groove 6 is used for guiding surrounding air to form a tornado on the surface of the umbrella skirt to enhance the stain removal effect, assist the stain removal efficiency of the umbrella skirt during resonance, avoid accumulation of stains at the edge of the umbrella skirt, in addition, the overhead transmission line deviates from the vertical position under the action of wind force, the insulator string is inclined, the gap between the wire and the tower is reduced, and the wind deviation angle of the insulator string exceeding the standard is a main reason for causing line tripping accidents, the swing amplitude of the high-voltage wire 9 is too large under strong wind, the natural wind forms a karman vortex street behind the insulator, periodic transverse forces are generated, the large vortex is broken into small vortexes through the rotational flow guide groove 6, the transverse force amplitude is reduced, and part of the airflow flows along the surface of the umbrella skirt to generate a damping force opposite to the wind deviation direction, so that the wind deviation discharge phenomenon is reduced.

[0061] As shown in Figure 4 - Figure 7 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 inside 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 main body of the umbrella skirt, 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.

[0062] 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 in 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 reduces the relative stiffness of the thinner electret sheet structure, which is more likely to deform under the same size of electrostatic force, i.e. improving 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 direction, thereby maintaining the overall cleaning effect.

[0063] As shown in 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.

[0064] 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 internally capture 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.

[0065] As shown in Figure 1 - Figure 3 As shown in the figure, in order to avoid the electric field distortion caused by the rotational flow guide groove 6 in the high field strength area, the rotational flow guide groove 6 is arranged on the side of the skirt protective sleeve 5 away from the high-voltage conductor 9, so as to avoid the direct exposure of the rotational flow guide groove 6 to the high field strength area, and eliminate the risk of electric field distortion, in addition, the edge of the rotational flow guide groove 6 is smoothly transitioned and an arc-shaped guide corner is additionally arranged to suppress partial discharge.

[0066] In addition, in order to better clean the stains on the surface of the umbrella skirt, the opening arc of one end of the rotational flow guide groove 6 away from the center of the umbrella skirt is twice that of the other end, and by expanding the opening at the far end, the airflow capturing capacity of the rotational flow guide groove 6 is enhanced, the natural wind entering the rotational flow guide groove 6 is accelerated by being squeezed at the narrow end, forming a high-speed directional whirlwind, the whirlwind flows closely to the surface of the umbrella skirt, and the suspended stain particles are sucked and the re-attachment of the stain to the surface of the umbrella skirt is blocked, assisting the vibration cleaning of the electret group 8, in addition, part of the airflow guided by the rotational flow guide groove 6 flows along the axial direction of the umbrella skirt, generating an aerodynamic damping force opposite to the wind deflection direction, and the rotational flow destroys large-scale transverse vortices, reducing the periodic wind load on the umbrella skirt and suppressing the swing amplitude, thereby reducing the wind deflection discharge phenomenon.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Embodiment two:

[0071] Please refer to Figure 8 - Figure 13The embodiment provides a technical scheme, and differs from the embodiment one. The insulator subassembly for modular combined 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.

[0072] The insulator subassembly for modular combined 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. In the scheme, a transmission type light intensity sensor is mainly used. The transmitting end of the sensor can be installed on the lower surface of the upper umbrella skirt, and the receiving end can be arranged on the upper surface of the adjacent lower umbrella skirt. As the stains accumulate on the receiving end on the surface of the umbrella skirt, the light sensing effect of the receiving end decreases, and then the stain condition on the surface of the umbrella skirt 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.

[0073] When the stain degree reaches or is lower than the preset threshold, 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 resonates through mechanical wave excitation, and the stains on the surface of the umbrella skirt are stripped by shear stress. When the light transmittance is restored or is higher than the triggering threshold, the signal generating element 11 can control the electret group 8 to stop working, so that the umbrella skirt is not continuously affected by resonance, and the service life of the umbrella skirt is improved.

[0074] As shown in 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. 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, and the power source thereof 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. It should 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. The DC / AC converter 113 also has the function of voltage boosting, so as to ensure that the alternating current supplied to the electret group 8 has sufficient voltage and power, thereby driving the electret group 8 to generate the vibration frequency and amplitude required for effective stain cleaning.

[0075] 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.

[0076] As shown in Figure 9 The embedding of the electret group 8 inside the umbrella skirt cuts the continuity of the umbrella skirt material, reducing its overall mechanical strength, and the continuous vibration generated by the electret group 8 when in operation directly acts on the umbrella skirt body, which may cause material fatigue damage over 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 due to its high damping properties, to buffer the vibration amplitude of the umbrella skirt.

[0077] As shown in Figure 9 The electret group 8 in this embodiment is covered with a FEP film with a thickness of 0.1 mm, which allows 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.

[0078] As shown in Figures 11-13 To facilitate the connection of adjacent umbrella skirts, the present scheme also includes a connecting piece for fixing and connecting two adjacent umbrella skirts. The connecting piece includes a connecting bowl head 4 located at the center of the umbrella skirt, with a first socket 18 on one side and a second socket 19 symmetrically provided 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 provided 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 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 for fixing the U-shaped limiting rod 12, thereby fixing the connecting bowl head 4 and the U-shaped limiting rod 12.

[0079] Due to the rigidity of the mechanical connection, under the influence of gravity or external force after connection, mechanical gap is prone to occur. In order to avoid the mechanical gap 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 for connecting 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.

[0080] 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.

[0081] 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 produce 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 insulator assembly for power equipment, comprising sheds, wherein the distances from the sheds to the high-voltage conductor (9) are sequentially divided into high-voltage end sheds (1), medium-voltage end sheds (2), and low-voltage end sheds (3), characterized in that, Also includes: Electret group (8), which is disposed inside the umbrella skirt, generates surface mechanical waves under the action of an electric field, thereby exciting the umbrella skirt to resonate; Skirt edge protective sleeve (5) is provided on the edge of each umbrella skirt, and its surface is provided with swirl guide groove (6). The skirt protective sleeve (5) has a groove (7) for installing electret group (8); The number of electret groups (8) inside the groove (7) increases from the high-voltage end to the low-voltage end to compensate for the electric field attenuation, and the thickness of the electret groups (8) decreases from the high-voltage end to the low-voltage end to enhance deformation sensitivity.

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

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

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

5. The modular combined insulator assembly for power equipment according to claim 4, characterized in that, The signal generating element (11) includes: The controller (111) is used to process the signal from the optical sensor (10) and output control commands; Power source (112), wherein the power source (112) is a storage battery; The DC / AC converter (113) is electrically connected to the power supply (112) and converts the DC power output from the power supply (112) into AC power to drive the electret group (8).

6. The modular combined insulator assembly for power equipment according to claim 5, characterized in that: The skirt edge protective sleeve (5) has a butyl rubber layer at the contact part with the umbrella skirt.

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

8. The modular combined insulator assembly for power equipment according to claim 5, characterized in that: It also includes a connector, the connector comprising: The connecting bowl head (4) is located at the center of the umbrella skirt, with a first insertion port (18) on one side and a second insertion port (19) symmetrically opened on the other side. The inner core (14) is fixed to the lower end of the connecting bowl head (4), and a groove (15) is provided on its outer side near the lower end. The U-shaped limiting rod (12) is inserted through the first socket (18), and its inner side cooperates with the slot (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 outside 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 power equipment according to claim 8, characterized in that: Also includes: An electrical connector is located inside the inner core (14) and is used to connect a signal generating element (11). The electrical connector includes an electrical connector seat (16) located at the lower end of the inner core (14). A carbon brush (22) is provided at the upper end of the electrical connector seat (16). A movable disk (21) is also slidably installed inside the inner core (14). An electrical connector plug (20) is fixed on the movable disk (21). The electrical connector plug (20) is electrically connected to the carbon brush (22), and the upper end of the electrical connector plug (20) can be plugged into an electrical connector seat (16) on another umbrella skirt. A rubber spring (17) is installed on the outside of the carbon brush (22) between the electrical connector seat (16) and the movable disk (21).

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