Tempered glass insulators have zero self-destruction characteristics. As long as it is observed on the ground or by helicopter, there is no need to climb the pole and detect it piece by piece, which reduces the labor intensity of workers. The introduction of production line products, the annual self-destruction rate of 0.02-0.04 percent, can save line maintenance costs. Good arc resistance and vibration resistance.The new surface of the glass insulator, which has been subjected to lightning burns during operation, is still a smooth glass body and has a tempered inner stress protection layer, so it still maintains sufficient insulation energy and mechanical strength. On the 500 kV line, the ice walking of the wire caused by the repeated dance accident was tested, the glass insulator was tested after the wire dance, and the electromechanical performance was not weakened. Self-cleaning performance is good and not easy to age According to the energy sector, the glass insulator does not accumulate dirt well and is easy to clean, and the glass insulator running along the southern line is washed cleaner after rain.The electromechanical properties of glass insulators on typical regional lines are regularly sampled to determine the electromechanical properties after service, and thousands of data are accumulated to show that the electromechanical properties of glass insulators after 35 years of service are basically consistent with those of the factory, and there is no aging phenomenon. The main capacity is large, the voltage distribution on the string is uniform, the permittivity of glass is 7-8, so that the tempered glass insulator has a large main capacity, and the voltage distribution on the string is uniform, which is conducive to reducing the voltage carried by the insulator near the wire side and the ground side, so as to reduce radio interference, reduce corona loss and prolong the service life of the glass insulator, which has been proven by operating practice.

The traction insulator is composed of reinforcement, traction, umbrella group, between the traction and the reinforcement is the inner cone with a fixed connection, in the mandrel between the fiberglass traction rod, the outer body with different diameters of the umbrella body is composed of an umbrella group, the umbrella body is made of silicone rubber, and is integrated with the traction as a whole, the fittings are made of carbon steel, and then its outer end is opened with a screw hole, with a screw, and the outer surface of the fittings and the box is covered with a sealing layer. The size of the umbrella structure effectively increases the leakage rate, made of carbon steel and made of fiberglass, the tensile strength of the traction is high, so that its mechanical strength has a certain guarantee, the main rod and the connection metal of the inner structure tensile value of 100kN, the outer sealing layer enhances the moisture resistance of the product, the threaded hole of the fitting is directly with the screw, easy to install. The installation of insulators on the traction line of the distribution line can effectively avoid the problem of accidental charging of the traction wire and realize the insulation of the traction wire and the ground. However, in the actual installation process, since the structure is small and reasonable, the design specifications are small, and the installation method is uneven, the role of the insulator cannot be played after installation, which affects the safe operation of the distribution line, so it is necessary to install the insulator in strict accordance with the specification requirements and control the common problems during installation. According to the clear requirements set out in the distribution line specification for the tension wire insulator during installation, construction personnel must control the tension wire insulator at a distance of more than 2.5m from the ground during installation. In the production of insulators, small pipes must be optimized in strict accordance with the relevant standards in terms of their performance or material selection. At present, many national requirements for the production of insulators have introduced many standards. The construction personnel should also consider the altitude of the installation site when installing the insulators, such as the ambient temperature: -40 degrees ~ 40 degrees; The maximum daily temperature difference: 25 degrees; The average monthly relative humidity < 90 percent and the average daily relative humidity < 95 percent. Withstand an earthquake of magnitude 8; The maximum thickness of the ice cover is 10 cm. The level of environmental pollution is level IV. The installation of insulators is usually carried out outdoors.

1. Excellent dielectric properties and no aging of glass insulators.The insulation performance of the insulator is closely related to the internal molecular structure of the insulating material. Glass has an amorphous structure, no fixed melting point of silicate compounds, dense structure, uniform texture, produced through an easy-to-control continuous production process, so as to eliminate the influence of production personnel on the performance of the insulator. SiO2 is the skeleton of the glass, other oxides are filled with the skeleton and bound by chemical bonds, the interaction is large, not easily polarized by the electric field, shows good inertia, is an ideal insulating material. 2. Glass insulator has good mechanical properties and temperature difference characteristics. When the vitreous body is still in a high temperature state after pressing and molding, the vitreous surface is suddenly cooled by spraying controlled cold air to create a uniform pre-stress, so that the interior of the vitreous body is compressed by the cold and generates internal stress, which makes the vitreous surface appear to be under constant compressive stress. After the glass body goes through the tempering process, its mechanical impact resistance is greatly improved. In addition, when a single grounding short circuit occurs in the transmission line, a large short-circuit current will be generated, which requires the insulator to have good arc resistance and so that the tensile strength cannot be reduced. The arc resistance of the tempered glass insulator is higher than that of the porcelain insulator, but the tensile strength is not significantly reduced. 3. Glass insulators have a long service life. The glass parts of the insulator are tempered (760 ~ 780 degrees) to obtain a uniform distribution of the internal tempering stress, which will not decrease with the extension of the service life of the product. The high temperature of the line operation is 70 ~ 80 degrees, which is far lower than the annealing temperature of the glass; in the case of lightning or flash pollution, although the arc temperature can reach more than 3,000 degrees C, the arc time is very short, and the glass cannot be annealed. Therefore, the glass insulator has a long life cycle and is not easy to age, the characteristics are scientifically valid. 

Composite insulator is a kind of good insulation control element which plays an important role in overhead power transmission lines. Composite insulators can be divided into: linear composite insulators and power plants, electrical composite insulators. It can also be divided into rod suspension composite insulator, pin composite insulator, cross-arm composite insulator, columnar composite insulator, wind-deflecting composite insulator, etc. In order to improve the electric field distribution and arc ignition performance of the composite insulator, two voltage equalization tests were carried out on the composite insulator above 10kV. Practice has shown that the composite insulator has the following advantages: strong antifouling overlapping ability. The surface of the composite insulator is hydrophobic, and the water on its surface is granular, making it difficult to form a conductive path. In addition, the umbrella disk diameter of the composite insulator is small, the creepage distance is long, the surface resistance is high, the leakage current is small, and the pollution lightning pressure is large. High strength, light weight. Due to the high tensile strength of the core, the composite insulators are easy to manufacture. It can reduce the stress of the tower body, reduce the installation and maintenance intensity, and save a lot of costs. Small size, light weight. Since the composite insulator is small in size, light in weight, flexible and not easy to damage, it brings great convenience to transportation, installation and maintenance.

1)The overhang wire clamp shall take into account the bare wire or wrapped wire rod and other conditions of use;2)The radius of curvature of the groove for the ship's hull wires shall not be less than 8 times the diameter of the wire and the grounding cable.3)The overhang clamp shall have a horizontal axis to allow the hull to rotate; 4)The overhang clamp shall have clear information about the limited range of use, such as the maximum exit angle, the minimum exit angle and the allowable angle.5)The design of the overhang wire clamp shall reduce the effect of breeze vibration on the wire and the grounding wire, and shall avoid stress concentration or damage to the wire and the grounding wire. The design of the overhang clamp shall also consider reducing the wear of the rotating shaft of the hull when the wire and the grounding wire are under horizontal unbalanced tension.6)The clamping force of the fixed hanging clamp on the wire and the earthing cable, as well as the ratio of the calculated breaking force with the wire and the earthing cable shall not be less than that specified or agreed upon by the supply and demand parties.7)There shall be sufficient contact surface between the hanging clamp of the wire and the installed wire and the earthing cable to reduce the damage caused by short-circuit current.