47results about How to "Increase pollution flashover voltage" patented technology

The invention discloses an anti-icing coating for an insulator. The anti-icing coating consists of a high-resistivity coating and a low-resistivity coating. The high-resistivity coating consists of silicon rubber and carbon black, wherein the weight percentage content of the carbon black is lower than 1 percent; and the high-resistivity coating is coated at the outermost edge of the skirt of the insulator. The low-resistivity coating consists of silicon rubber and carbon black, wherein the weight percentage content of the carbon black is between 10 percent and 30 percent; and the low-resistivity coating is coated on the surface of the insulator except the outermost edge. Two coatings with high resistivity and low resistivity are prepared respectively by adding carbon black into the silicon rubber according to different proportions; the upper surface and the lower surface of the skirt of the insulator are coated with the low-resistivity coating; and the outermost edge of the skirt of the insulator is coated with the high-resistivity coating. By adopting the high-resistivity coating, ice is prevented from growing at the skirt edge by adopting the high-resistivity coating, the flashover voltage is prevented from being lowered by ice bridging, the working stability of the insulator is enhanced, and safe and reliable power transmission is ensured.

The invention relates to an anti-pollution-flashover superhydrophobic paint, and a preparation method and application thereof, belonging to the field of paints. The preparation method comprises the following steps: (1) adding nano silicon dioxide particles into a polydimethylsiloxane-containing organic solvent until the nano silicon dioxide particles are uniformly dispersed, and volatilizing the organic solvent to obtain low-surface-energy nano silicon dioxide particles; and (2) adding the low-surface-energy nano silicon dioxide particles prepared in the step (1) and an adhesive into an organic solvent, and stirring to obtain the anti-pollution-flashover superhydrophobic paint. The method has the advantages of simple technical process, low facility requests, wide raw material sources and low cost. The prepared anti-pollution-flashover superhydrophobic paint has the advantages of excellent hydrophobicity, high aging resistance, favorable self-repair effect, high pollution flashover voltage and the like, and is used for external insulation protection of transmission equipment and transformer equipment in heavy-smog regions.

The invention discloses an anti-pollution flashover coating. The coating comprises the following components in parts by weight: 15-25 parts of modified silicone resin, 1-12 parts of nano white carbon black, 5-10 parts of mica powder, 5-10 parts of aluminium hydroxide, 15-20 parts of nano polytetrafluoroethylene micro powder, 1-2 parts of titanium dioxide and 0.1-1 part of catalyst. The coating has the advantages that the coating is formed by adopting an interpenetrating polymer network structure; by utilizing excellent anti-static adsorbability and hydrophobicity of fluoride materials and excellent hydrophobicity of silicone materials, the adsorption effects of the surface of the coating on water drops, dust and charged particles are obviously reduced; the coating has good self-cleaning property and weatherability, effectively achieves the aims of long-term pollution flashover and icing prevention of power systems, can increase the pollution flashover voltages of porcelain insulators and is beneficial for improving the reliability of transmission line operation and lengthening the normal operation cycle.

The invention discloses a 1,200kV extra-high voltage suspension type composite rod insulator, which consists of two insulators, wherein the two insulators are connected in series through connecting fittings, and the highest voltage of each insulator is 1,200kV; each insulator comprises a mandrel, and a sheath and umbrella skirts which are arranged on the mandrel in a sleeving manner; voltage sharing rings are arranged at the two ends of the mandrels; a voltage sharing ring on the wire side is a double-layer voltage sharing ring. According to the 1,200kV extra-high voltage suspension type composite rod insulator, the double-layer voltage sharing ring is arranged on the wire side, and a special umbrella skirt design method is adopted, so that the 1,200kV extra-high voltage suspension type composite rod insulator has the advantages of light weight, strong strength, high hydrophobicity and hydrophobic mobility of a silicon rubber surface, high flashover voltage and the like, and the running requirements of an extra-high voltage power transmission line under extreme climate conditions of high humidity, high temperature and the like can be met.

The invention discloses a high-voltage-dropout-type fuse cutout comprising a fuse tube, a fuse wire, a fixed contact, a fixed contact support, a pillar insulator, a moving contact, a moving contact support and an arcing shield, wherein the fixed contact is arranged on the fuse tube; the fixed contact support is arranged at one end of the pillar insulator; the moving contact is arranged at the other end of the pillar insulator; the moving contact support is arranged on the fuse tube; the moving contact is also provided with the arcing shield; the fuse wire is used for tensioning the moving contact on the moving contact support; the fixed contact support and the moving contact are provided with a wire connecting bolt respectively; and the moving contact support end of the fuse tube is also provided with a flow guide tube, and one end of the flow guide tube is provided with a cover. Because the flow guide tube and the cover used for covering the end of the flow guide tube are arranged at one side of the arcing shield of the fuse tube in the scheme, the damages to the arcing shield caused by arcs can be reduced, thus the arcing shield can be repeatedly used.

The invention refers to the usage of silicon fluoride latex to prepare synthetic insulator in high-voltage transmission and transformation lines. It enhances hydrophobic property and age resistance of high-silicon latex, the core rod being routine epoxy glass-cloth, makes the insulator extrude metal fitting, casts silicon fluoride latex, heats and vulcanizes to make it.

The invention discloses a cementing type double-umbrella-shaped and three-umbrella-shaped suspension type polymer composite string insulator unit. The polymer composite string insulator unit comprises a steel cap metal element, a steel foot metal element, an insulating core element, a polymer protective sleeve and a polymer skirt. A cavity with a U-shaped section is formed in the steel cap metal element, the steel foot metal element is provided with a cone head portion matched with the cavity, the cone head portion of the steel foot metal element is arranged in the cavity of the steel cap metal element, the insulating core element is arranged between the cone head portion and the cavity, the center of the insulating core element is provided with a cementing portion which is a cavity of an inverted cone shape, the polymer protective sleeve wraps the outer surface of the insulating core element, the polymer skirt of a double-umbrella-shaped or three-umbrella-shaped structure is disposed on the outer surface of the polymer protective sleeve, the cone head portion of the steel foot metal element is integrated with the cementing portion in a cementing mode through an adhesive, and the cavity of the steel cap metal element is integrated with the cementing portion in a cementing mode through an adhesive. The polymer string insulator unit has the advantages of preventing bird damages, and being resistant to wind and sand, resistant to damages caused by external force and capable of assisting climbing.

The invention discloses an anti-pollution-flashover paint which is composed of the following components in parts by weight: 100-120 parts of pure titanium dioxide sol, 10-20 parts of oxydol, 14-18 parts of mica powder, 25-45 parts of organotin, 20-40 parts of aluminum hydroxide, 6-12 parts of decabromodiphenyl oxide, 22-34 parts of trichloroethylene, 15-25 parts of organic silicon water repellent, 15-25 parts of modified organic silicon resin, 1-12 parts of nano silica white, 5-10 parts of mica powder, 5-10 parts of aluminum hydroxide, 15-20 parts of nano polytetrafluoroethylene micropowder, 1-2 parts of titanium white, 0.1-1 part of catalyst and 20-30 parts of solvent. The anti-pollution-flashover paint is formed by a polymer interpenetrating network structure; and by utilizing the excellent static adsorption resistance and hydrophobicity of the fluoride material and the excellent hydrophobicity of the organic silicon material, the adsorption effect of the coating surface on water drops, dust and charged particles is obviously reduced, and the coating surface has favorable self-cleaning property and weather resistance, effectively achieves the goals of long-term pollution flashover prevention and ice prevention of the power system, can enhance the pollution flashover voltage of the porcelain insulator and is beneficial to enhancing the operation reliability of the transmission line and prolonging the normal operation cycle.

The invention relates to a disk-shaped suspension porcelain or glass composite insulator, wherein an iron cap is arranged on the upper part of a porcelain element or a glass element, and steel pins are arranged on the lower part thereof, an integral combined shelter is mould pressing formed or injection molded on the middle lower parts of the steel pins, and at least two radial recesses are arranged on the upper surface of the porcelain element or glass element. According to the invention, integral shelters made of organic materials are respectively arranged on the iron cap and steel pins to greatly improve the creepage distance and to reinforce the pollution flashover prevention capability, and the integral shelters can be produced in an industrial large scale manner. The products are manufactured in factories to guarantee the quality of the product interfaces, so the aging speed is slow; the non-ridge structure guarantees a simple production technique; the small dimension greatly reduces the weight of the insulator; the recesses arranged on the upper surface of the porcelain element or glass element to facilitate the rain on the upper surface to flow away; the integral combined shelter arranged on the steel pins can shield the rain to keep the dryness of the upper surface of the next adjacent insulator to improve the wet flashover voltage and to block the electrons emitted by the steel pins so as to improve the dry flashover voltage.

The invention discloses a glazing process of a semiconductive glaze and the semiconductive glaze used by the glazing process. The process comprises the following steps of: preparing the following components in parts by mass: 20 parts to 30 parts of feldspar powder, 20 parts to 30 parts of quartz powder, 2 parts to 6 parts of calcite, 8 parts to 15 parts of KuanCheng soil, 3 parts to 6 parts of TiO2, 15 parts to 20 parts of Fe2O3 and 1.5 parts to 4.5 parts of Cr2O3 to prepare the semiconductive glaze; cementing a flange plate of a semiconductive glaze blank to the lower edge of the closest umbrella to be covered by a rubber belt, and then spraying a layer of common glaze on the blank by a glaze spraying machine; then taking off the rubber belt and spraying a layer of semiconductive glaze slip on the covered position of the rubber belt; and spraying sand on the cemented position of the flange plate. By utilizing the semiconductive glaze prepared by the process, the original problems of uneven electric field distribution near the flange plate, too large insulation resistance value of porcelain sleeve surface and high local electric discharge index can be overcome.

The invention relates to an outdoor dry-type voltage transformer used for an electric locomotive, which comprises a main body which is composed of an iron core, a primary winding which is sheathed on the iron core, and a secondary winding, a primary terminal connector, a secondary terminal connector, a primary high-voltage insulation column which is sheathed outside of the primary terminal connector, and a base, wherein the main body, the primary terminal connector, the secondary terminal connector and the primary high-voltage insulation column are fixedly installed on the base after integrally adopting epoxide resin and silicon rubber to compositely insulate the secondary terminal connector and the primary high-voltage insulation column into a whole structure, wherein the primary high-voltage insulation column and the main body are in cylindrical shape or ellipsoidal shape, and the connection between the primary high-voltage insulation column and the main body is a spherical surface whose both sides are cut obliquely. The outdoor dry-type voltage transformer can prevent the leakage of oil and the generation of a pollution flashover fault, and the invention has the advantages of stable insulation, fuse protection, long service life, small volume, convenient fixing, high mechanical strength, and wide application.

The invention discloses a cementing type bell-shaped disk-shaped suspension type composite polymer string insulator unit. The polymer string insulator unit comprises a steel cap metal element, a steel foot metal element, an insulating core element and a polymer skirt. A cavity with a U-shaped section is formed in the steel cap metal element, the steel foot metal element is provided with a cone head portion matched with the cavity, the cone head portion of the steel foot metal element is arranged in the cavity of the steel cap metal element, the insulating core element is arranged between the cone head portion and the cavity, the center of the insulating core element is provided with a cementing portion which is a cavity of an inverted cone shape, the bell-shaped polymer skirt wraps the outer surface of the insulating core element, the inner wall of a bell-type body is provided with a plurality of prismatic protrusions coaxial with the insulating core element, the cone head portion of the steel foot metal element is integrated with the cementing portion in a cementing mode through an adhesive, and the cavity of the steel cap metal element is integrated with the cementing portion in a cementing mode through an adhesive. The polymer string insulator unit has the advantages of preventing bird damages, and being resistant to wind and sand, resistant to damages caused by external force and capable of assisting climbing.

The invention provides an umbrella-shaped structure of a super / extra-high voltage alternating-current composite insulator to optimize umbrella-shaped design and increase creep distance utilization rate. The umbrella-shaped structure comprises large umbrellas and small umbrellas which are equal in diameter and are alternately arranged, and the creep coefficient of the composite insulator ranges from 3.8 to 4.2. The flashover voltage of the umbrella-shaped composite insulator at unit insulating height under a hydrophilic condition is higher than that of an umbrella-shaped composite insulator with a large umbrella and two small umbrellas for a 1000kV extra-high voltage test demonstration project, the string lengths of composite insulators in regions with different contamination degrees can be decreased to different degrees, accordingly, the size of a tower is optimized, and the manufacturing cost of a power transmission line is greatly saved.

The invention discloses a super-amphiphobic material with hydrophobic migration and self-repairing performance, the super-amphiphobic material comprises a hydrophobic migration modified resin bottom layer and a super-hydrophobic and super-oleophobic surface layer arranged on the surface of the hydrophobic migration modified resin bottom layer, and a coating adopted by the hydrophobic migration modified resin bottom layer is mainly formed by mixing a resin dispersion liquid, a migration agent and an auxiliary agent; a coating adopted by the super-hydrophobic and super-oleophobic surface layer is mainly prepared from acid modified silicon dispersion liquid and fluorosilane. The super-amphiphobic material disclosed by the invention has good super-hydrophobic and super-oleophobic characteristics and self-repairing performance; and the related preparation method is simple, convenient to operate, low in cost, capable of realizing macro preparation and suitable for popularization and application.

The invention discloses a cementing type bell-shaped disk-shaped suspension type polymer string insulator unit. The polymer string insulator unit comprises a steel cap metal element and a steel foot metal element, wherein a cavity with a U-shaped section is formed in the steel cap metal element, the steel foot metal element is provided with a cone head portion matched with the cavity, the cone head portion of the steel foot metal element is arranged in the cavity of the steel cap metal element, a polymer insulating element is arranged between the cone head portion and the cavity, the polymer insulating element comprises a bell-shaped skirt, the center of the skirt is provided with a cementing portion which is a cavity of an inverted cone shape, the inner wall of a bell-shaped body is provided with a plurality of prismatic protrusions coaxial with the polymer insulating element, the cone head portion of the steel foot metal element is integrated with the cementing portion through an adhesive in a cementing mode, and the cavity of the steel cap metal element is integrated with the cementing portion through an adhesive in a cementing mode. The polymer string insulator unit has the advantages of preventing bird damages, and being resistant to wind and sand, resistant to damages caused by external force and capable of assisting climbing.

The invention discloses a cementing type double-umbrella-shaped and three-umbrella-shaped suspension type polymer string insulator unit. The polymer string insulator unit is characterized by comprising a steel cap metal element and a steel foot metal element, wherein a cavity with a U-shaped section is formed in the steel cap metal element, the steel foot metal element is provided with a cone head portion matched with the cavity, the cone head portion of the steel foot metal element is arranged in the cavity of the steel cap metal element, a polymer insulating element is arranged between the cone head portion and the cavity, the polymer insulating element comprises a skirt of a double-umbrella-shaped or three-umbrella-shaped structure, the center of the skirt is provided with a cementing portion which is a cavity of an inverted cone shape, the cone head portion of the steel foot metal element is integrated with the cementing portion in a cementing mode through an adhesive, and the cavity of the steel cap metal element is integrated with the cementing portion in a cementing mode through an adhesive. The polymer string insulator unit has the advantages of preventing bird damages, and being resistant to wind and sand, resistant to damages caused by external force and capable of assisting climbing.

The invention discloses an outdoor totally-enclosed composite insulation three-phase combined transformer. The transformer comprises three single-phase combined transformers of the same structure anda base, the three single-phase combined transformers are arranged to be a phase A, a phase B and a phase C respectively and evenly arranged on the base, and a junction box and a low-voltage terminal of a high-voltage primary coil are correspondingly arranged on the two sides of the lower portion of each single-phase combined transformer; the low-voltage terminals of the three single-phase combinedtransformers are connected through a line bank, the line bank is connected with a grounding terminal strip, and the grounding terminal strip is connected with a grounding terminal on the base. The three-phase combined transformer is compact in structure, excellent in layout, accurate in metering and stable and reliable in performance, the outdoor complex operation environment is fully considered,the current part can achieve three transformation ratios, the voltage part can achieve voltage conversion from 15 kV to 20 kV according to different requirements of users, installation is convenient,pollution flashover resistance is achieved, maintenance is avoided, the self-cleaning performance is high, electricity larceny prevention is reliable, and the operation life is long.

The invention discloses an adhesive binding and suspended type disc-shaped polymer composite insulator chain element with a clock-shell-shaped umbrella shirt. The adhesive binding and suspended type disc-shaped polymer composite insulator chain element comprises a steel cap and a steel leg. A cavity with the U-shaped cross section is formed inside the steel cap. A conical head portion matched with the cavity is arranged on the steel leg. The conical head portion of the steel leg is arranged in the cavity of the steel cap. A polymer insulating piece is arranged between the conical head portion and the cavity. The polymer insulating piece comprises the clock-shell-shaped umbrella shirt. The surface of the umbrella shirt is coated with an RTV stain-proofing coating. An adhesive binding portion is arranged at the center of the umbrella skirt. The adhesive binding portion is an inverted conical cavity. A plurality of prismatic protrusions are arranged on the inner wall of a clock-shell-shaped body, wherein the prismatic protrusions and the polymer insulating piece are coaxial. The conical head portion of the steel leg and the adhesive binding portion are connected into a whole in an adhesive binding mode through adhesives. The cavity of the steel cap and the adhesive binding portion are connected into a whole in an adhesive binding mode through adhesives. The adhesive binding and suspended type polymer insulator chain element can resist bird trouble, sand wind and external damage and can assist in climbing.

The invention discloses a cementing type composite insulator chain element with a double-umbrella-shaped and three-umbrella-shaped disk suspension type polymer. The element comprises a steel cap fitting, a steel leg fitting, an insulation core part, a polymer protecting sleeve and a polymer umbrella skirt. A cavity with the U-shaped section is formed in the steel cap fitting. The steel leg fitting is provided with a conical head portion matched with the cavity. The conical head portion of the steel leg fitting is arranged in the cavity of the steel cap fitting. The insulation core part is arranged between the conical head portion and the cavity. A cementing part is arranged in the center portion of the insulation core part and is an inverted-cone-shaped cavity. The outer surface of the insulation core part is covered with the polymer protecting sleeve. The outer surface of the polymer protecting sleeve is provided with the polymer umbrella skirt of a double-umbrella-shaped or three-umbrella-shaped structure. The conical head portion of the steel leg fitting and the cementing part are cemented into a whole through adhesive. The cavity of the steel cap fitting and the cementing part are cemented into a whole through the adhesive. The element can prevent bird damage, resist sand wind, prevent external force damage and assist in climbing and treading.

The invention discloses an integrated-molding-type double-umbrella-shaped or three-umbrella-shaped disk-shaped suspension-type polymer insulator string element. The integrated-molding-type double-umbrella-shaped or three-umbrella-shaped disk-shaped suspension-type polymer insulator string element comprises a steel cap fitting, a steel leg fitting and a polymer insulating part, wherein the inner portion of the steep cap fitting is provided with a cavity with a U-shaped cross section, and the steel leg fitting is provided with a conical head portion matched with the cavity; the conical head portion of the steel leg fitting is arranged in the cavity of the steel cap fitting; the disk-shaped polymer insulating part is arranged between the steel cap fitting and the steel leg fitting, the disk-shaped polymer insulating part is formed in one step through an integrated injection or pouring technology, meanwhile, the disk-shaped polymer insulating part, the steel cap fitting and the steel leg fitting are solidified into a whole at high temperature, and the polymer insulating part comprises a shed of a double-umbrella-shaped structure or a three-umbrella-shaped structure. The integrated-molding-type double-umbrella-shaped or three-umbrella-shaped disk-shaped suspension-type polymer insulator string element has the advantages of preventing bird trouble and being resistant to sand, wind and external force destroy and capable of assisting climb and tread.

The invention provides a silicone rubber creepage extender shield and a mounting technique thereof. The silicone rubber creepage extender shield comprises a chassis, a base plate, a cover and a lug boss, wherein the middle part of the chassis is opening; a first channel is arranged on the surface of the chassis; a first connecting part and a second connecting part are arranged on the two sides of the first channel; the first connecting part and the second connecting part are coincided with each other, so that the chassis is closed; the base plate is internally connected with the opening of the chassis; a first notch is arranged on the base plate; the cover is covered on the chassis; a through hole is formed in the middle of the cover; a second channel is arranged on one side of the cover; a third connecting part and a fourth connecting part are arranged on the two sides of the second channel; the third connecting part and the fourth connecting part are coincided with each other, so that the cover is closed and is jointed with the chassis; the lug boss is covered on the cover along the peripheral direction of the through hole of the cover; a port is arranged in the middle of the lug boss; a second notch is arranged on the lug boss. The creepage extender has excellent material performance; a large-diameter flash creepage extender has a certain self-cleaning function and shows the performance better than that of an anti-fouling insulator; the creepage extender is especially suitable for a high voltage large-scale power substation which is difficult to cut off power or to clean under an electrified state.

The invention discloses a high-voltage insulation gas circuit distributor for a high-speed motor train unit. The high-voltage insulation gas circuit distributor comprises a distributor body, an upper-end connecting part, a lower-end connecting part, a gas channel core body and outer insulation umbrella groups, wherein the upper-end connecting part and the lower-end connecting part are arranged at the two ends of the distributor body; the outer insulation umbrella groups are distributed on the periphery end of the distributor and are integrally injection molded with the distributor body; the gas channel core body is arranged at the inner end of the distributor body; each of the port of the upper-end connecting part and the port of the lower-end connecting part is provided with a plurality of gas channels with trapezoidal sealing grooves which enable the gas channel core body to be in close fit with the gas channels of the upper-end and lower-end connecting parts, and enable the gas channels to communicate with the gas channel core body. The high-voltage insulation gas circuit distributor has the following characteristics that the sealing property is good; the distributor is capable of bearing the severe outdoor conditions, such as acute radiation of ultraviolet rays, salt mist, fine sand flying up in the air, high and low temperature change in the south and north areas and haze weather and has good anti-creepage trace, flame retardance and hydrophobicity; and the reliability and economy of the product can be ensured.

The invention relates to a disk-shaped suspension insulator special for a tension resisting circuit. The disk-shaped suspension insulator comprises an umbrella disk and a columnar head, wherein at least one upper umbrella edge is arranged on the upper surface of the umbrella disk; a plurality of lower umbrella edges are arranged on the lower surface of the umbrella disk; and the upper umbrella edge and the lower umbrella edges form two serially-connected standard umbrella shapes. In the invention, the umbrella edges are arranged on the upper part and the lower part of the insulator umbrella disk; and the head has a columnar structure for tension resisting strings. Compared with a deep umbrella edge insulator, the disk-shaped suspension insulator has the advantages that: the upper and lower umbrella edges of the insulator are shallower for effectively reducing the height of the edges; the insulator can improve wind and rain self-cleaning performance, and the leakage current tends to the surface of the umbrella edge so as to prevent arc bridge connection and improve anti-pollution performance of the product; and the deep umbrella anti-pollution umbrella shape is changed into two serially-connected standard umbrella shapes, and the voltage is uniformly distributed on the upper and lower surfaces so that the creeping distance effectiveness is higher, the pollution flashover voltage is higher and the anti-pollution effect is improved.

The invention provides pollution-flashover-preventing coating with high self-cleaning and ultra-strong hydrophobic performance and belongs to the technical field of coating. The pollution-flashover-preventing coating is prepared by the invention is prepared from the following components in parts by mass: 10 to 15 parts of magnesium oxide, 8 to 12 parts of aluminum hydroxide, 3 to 5 parts of ferroferric oxide, 2 to 8 parts of 2-(isopropylamino)ethyl methacrylate, 30 to 50 parts of fluorine-containing p-hydroxybenzoate, 20 to 25 parts of organic silicon, 10 to 15 parts of poly-dimethyl hydroxylsiloxane containing blocked methylene, 5 to 8 parts of boron-containing polydimethylsiloxane, 3 to 5 parts of expanded graphite, 8 to 10 parts of decabromodiphenyl ethane, 5 to 10 parts of polyurethanePPA, 10 to 15 parts of diacetone acrylamide, 2 to 8 parts of oxalyl dihydrazide, 1 to 3 parts of stannous octoate, 80 to 200 parts of petroleum ether and 2 to 8 parts of ethylene glycol. According tothe high-self-cleaning pollution-flashover-preventing coating provided by the invention, the hydrophobic performance and the self-cleaning performance indexes are greatly improved; the self-cleaningperformance can be used for effectively reducing the pollution accumulation amount on the surface of a coating layer during an operation period and a better pollution-flashover-preventing effect is obtained; the hydrophobic performance is greatly improved and the service life is greatly improved.

The invention discloses an antipollution flashover disk-shaped insulator comprising an umbrella tray of a gossan, the lower surface of the parachute tray is provided with annular umbrella ridges and a water dripping edge, the water dripping edge is integrated with the umbrella tray, and a distance h1 between the lowermost end of the water dripping edge and an axis L of a disk-shaped insulator is smaller than a distance h2 between the uppermost end of the water dripping edge and the axis L of the disk-shaped insulator, i.e. the diameter of the lowermost end of the annular water dripping edge is smaller than that of the uppermost end of the water dripping edge. Because the distance h1 between the lowermost end of the water dripping edge and the axis L of the disk-shaped insulator is smaller than the distance h2 between the uppermost end of the water dripping edge and the axis L of the disk-shaped insulator, accumulated dirt on the umbrella tray naturally falls under the action of wind force and rain water, and dust particles in the atmosphere can be blocked from entering the lower surface of the umbrella tray so as to prevent the dust particles from being accumulated on the umbrella ridges on the lower surface of the umbrella tray; and moreover, an insulation ring and a cleaning brush are arranged on the umbrella tray, the accumulated dirt on the umbrella tray can be constantly swept off under the pushing of the wind force, thus the cleanness of the upper surface of the insulator is ensured and the purpose of antipollution flashover is achieved.

The invention discloses a composite insulator umbrella-shaped structure, which includes a mandrel, a sheath, a large umbrella skirt and a small umbrella skirt, the large umbrella skirts and the small umbrella skirts are arranged alternately, the diameter of the large umbrella skirt is 151.3-204.7 mm, and the diameter of the small umbrella skirt is 151.3-204.7 mm. is 127.5~172.5 mm, the umbrella spacing is 59.5~80.5mm, the minimum umbrella spacing is 29.75~40.25 mm, the large umbrella skirt umbrella extension is 53.12~71.88mm, the small umbrella skirt umbrella extension is 41.22~55.78mm, the upper umbrella inclination angle The inclination angle to the lower umbrella is 78.8°~106.6°, and the chamfer radius of the umbrella root is 6.8~9.2 mm. The invention can optimize the electric field distribution of each shed on the composite insulator, avoid high potential difference near the shed, and the symmetrical umbrella structure is beneficial to improve the self-cleaning ability of the tensile composite insulator, improve the pollution flashover voltage of the composite insulator, and improve Pollution flashover resistance of tension strings of transmission lines.