53 results about "Polymer insulators" patented technology

Disclosed is a lightning arrester. The lightning arrester safely discharges earth charge of a main electrode section and an auxiliary electrode section regardless of a variation of charge contained in air, so charge charged in a thundercloud is safely discharged into the earth even if the thundercloud is located far-remote from the earth. The lightning arrester has a fixing base fixedly installed on an object to be protected by grounding a lightning circuit connected to a ground electrode grounded to an earth, a fixing bar vertically installed at one side of an upper surface of the fixing base and made of conductive material, a main electrode section making contact with an upper portion of the fixing bar and made of conductive material, an upper polymer insulator including an elongated column member formed at a center thereof with a hollow section for receiving the fixing bar therein, and upper and lower disc-shaped plates integrally formed at an upper end of the elongated column member for ensuring an insulation distance, and an auxiliary electrode section aligned below the main electrode section without making contact with the main electrode section and made of conductive material. The elongated column member of the upper polymer insulator passes through a center of the auxiliary electrode section in order to fill space charge in the auxiliary electrode section.

A silicone rubber composition comprising (A) 100 parts by weight of an organopolysiloxane composition of the organic peroxide or addition curing type, (B) 1-100 parts by weight of finely divided silica, and (C) 30-500 parts by weight of aluminum hydroxide is suitable for use as a high-voltage electrical insulator. The aluminum hydroxide (C) has a water-soluble sodium ion content of up to 0.01% by weight and exhibits pH 6.5-8.0 and an electrical conductivity of up to 50 mu s / cm when measured as a 30 wt % water slurry and preferably has been treated to be hydrophobic. The composition cures into a silicone rubber having improved high-voltage electrical insulating properties even under rigorous conditions.

The invention belongs to the technical field of high-voltage electrical insulating material, and particularly relates to an effective method for improving the flashover performance of a vacuum edge surface of a polymer insulator. The method comprises the step of enabling the polymer insulator to be contacted with fluorine-containing gas with a certain proportion at a certain temperature for generating fluoridation to form a fluoride layer with a certain thickness on the surface of the polymer. The method has the characteristics that the fluoride layer is formed on the surface of the polymer such as polyethylene, polypropylene, nylon and the like by the fluoridation of the gas, so that the flashover performance of the vacuum edge surface of the insulator can be improved, the surface breakdown voltage of the insulator is increased, and the insulating strength of the surface of the fluorizated insulator is 1.2-1.6 times higher than that of the non-fluorizated insulator.

Disclosed is a lightning arrester. The lightning arrester safely discharges earth charge of a main electrode section and an auxiliary electrode section regardless of a variation of charge contained in air, so charge charged in a thundercloud is safely discharged into the earth even if the thundercloud is located far-remote from the earth. The lightning arrester has a fixing base fixedly installed on an object to be protected by grounding a lightning circuit connected to a ground electrode grounded to an earth, a fixing bar vertically installed at one side of an upper surface of the fixing base and made of conductive material, a main electrode section making contact with an upper portion of the fixing bar and made of conductive material, an upper polymer insulator including an elongated column member formed at a center thereof with a hollow section for receiving the fixing bar therein, and upper and lower disc-shaped plates integrally formed at an upper end of the elongated column member for ensuring an insulation distance, and an auxiliary electrode section aligned below the main electrode section without making contact with the main electrode section and made of conductive material. The elongated column member of the upper polymer insulator passes through a center of the auxiliary electrode section in order to fill space charge in the auxiliary electrode section.

Embodiments relate to a Wingless Hovering Micro Air Vehicle and its Power Source Unit. Embodiments can operate at reasonable power levels for hovering and withstanding expected wind gusts. Embodiments can have a diameter less than 15 cm. Embodiments can have one or more smooth (continuous curvature) surface and can be operated using electromagnetic and electrohydrodynamic principles. The wingless design of specific embodiments can allow operation with no rotating or moving components. Additional embodiments can allow active response to the surrounding flow conditions. The issue of low lift to drag ratio and degradation of airfoil efficiency due to the inability of laminar boundary layers attachment can also be significantly reduced, or eliminated. The electromagnetic force can be generated by applying a pulsed (alternating / rf) voltage between a set of grounded and powered electrodes separated by a polymer insulator, dielectric, or other material with insulating properties.

A flexible, moldable material is provided with bi-conductive surfaces that can be fabricated using simple, cost-effective, and scalable deposition processes. The material is a composite structure composed of two conductive or semi-conductive sheets sandwiching a thin polymer insulator, all bonded together at their interfaces. The two functionalized sheets are made of conductive or semi-conductive particles dispersed through a flexible polymer. In one embodiment, a protective coating over the outer conductive sheets is applied to improve the durability of the composite structure. The material can be patterned into custom shapes and patterns with sizes ranging from meso-scale (millimeters) to macro-scale (meters) dimensions. The thicknesses of the components can also be tailored to be thin, such as a few hundred microns, yet the material maintains very good durability.

Medium voltage polymer insulators coated with semi-conducting refractory paint exhibit higher puncture strength and better corona erosion (corona cutting) resistance than a typical non-coated polymer insulator. The refractory semi-conducting paint is surface bonded to the ends of the polymer chains via electron beam reactive processing methods resulting in a mechanical bond on a molecular level to the polymer chain.

The invention relates to a preparation method of a modified polymer insulator material. The preparation method of the modified polymer insulator material comprises the following steps of: pre-heating an internal mixer to 150 DEG C to 160 DEG C; dropping an upper top bolt after adding polypropylene, banburying for 115 seconds to 125 seconds under the pressure of 0.5MPa-0.6MPa and temperature of 150 DEG C to 170 DEG C; then adding polythene and banburying for 115 seconds to 125 seconds under the pressure of 0.5MPa-0.6MPa and temperature of 150 DEG C to 170 DEG C; raising the upper top bolt, banburying for 115 seconds to 125 seconds under the temperature of 150 DEG C to 170 DEG C; and finally discharging, cooling and pelletizing, wherein the molecular weight of each of polypropylene and polyethylene is 10 thousand to 20 thousand. The modified polymer insulator material prepared by the preparation method not only can satisfy the electrical characteristics and mechanical performance requirements of the insulator, but also can satisfy the service life requirement. Besides, the preparation method has an antifouling self-cleaning function and has the advantages of high cost performance, energy conservation and environment protection and no pollution, so that the product can be recycled after reaching the service life.

For the purpose of providing an insulting layer which enables to improve device characteristics when used in an electronic device, a polymer insulator containing a repeating unit represented by the formula below is contained in the insulating layer. In the formula, R represents a direct bond or an arbitrary linking group; Ar represents an optionally substituted divalent aromatic group; and R represents a hydrogen atom, a fluorine atom or a monovalent organic group.

The invention discloses a cable trench cover plate prepared by doping retired polymer insulator rubber and core rod powder and a preparation method thereof. The retired insulator rubber and core rod are pulverized, and the pulverized retired insulator rubber and core rod serve as fillers and respectively added to silicone rubber and glass fiber reinforced epoxy resin and prepare a composite resincapable trench cover plate through high-temperature moulding and solidification. The method realizes recycling and reusing of the retired insulator material in the field of cable trench cover plate preparation for the first time. The test shows that the cable trench cover plate prepared according to the preparation method is excellent in various performance parameters and that mechanical propertyand thermal property test data results of the cable trench cover plate are higher than that of an ordinary concrete cover plate and steel fiber reinforced cover plate. The method achieves a technicaleffect of recycling a lot of retired insulator materials under the condition of not influencing the performance of the composite resin cover plate in all aspects for the first time, and has importantsignificance and application values on the aspects of waste macromolecular material recycling, energy conversation and sustainable development of materials.

A polymer insulator capable of reducing usage of rubber without reducing quality or performance, is provided. In a housing (5) composed of a core member (2), a cylinder portion (3) and umbrella portions (4) which are provided around the core member (2), and in a polymer insulator (1) provided at two ends of the core member (2) and composed of holding components (6), at least the thickness of the umbrella portions (4) at two ends are thicker than that of other umbrella portions (4).

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.

A termination for extra high voltage includes, around a central conductor (1), a deflector cone (2) made of flexible material covered by a polymer insulator having a first internal insulating element (3) and containing a conducting deflector (5), the conductor (1) is connected to an output terminal (6). The maximum diameter (D) of the first insulating element (3) at right angles to the length (L) of the deflector cone (2) included between the conducting deflector (5) and the adjacent end of the output terminal (6) is greater than or equal to double the maximum diameter (d1) of the conducting deflector (5).