composite insulator for High Speed railway

Advantages of Composite insulators:
Compared with traditional porcelain insulators and glass insulators, composite insulators have the following advantages:
1) High strength and light weight. The strength-to-weight ratio of composite insulators is high, that is, the specific strength is high. Its high mechanical strength originates from the excellent mechanical properties of FRP mandrels, which are currently used by a large number of
The tensile strength of the fiberglass reinforced plastic rod used can reach more than 1000MPa, and the density of the core rod is only about 2p/cm3, so its specific strength is very high, about 5~10% of high-quality carbon steel.
times. Under the same voltage level, the weight of the composite insulator is only 1/7~1/10 of the porcelain insulator.
(2) The wet flashover pollution flashover voltage is high. The hydrophobicity of the low-energy surface of organic composites is the main reason for the excellent resistance to moisture and dirt of composite insulators. In fog, light rain, dew, melting snow, melting ice
Under such bad weather conditions, the surface of the Composite insulator forms separate water droplets instead of a continuous water film.
Local arc, local arc is also difficult to further develop and lead to external insulation flashover. After running for a period of time, after the surface of the High-voltage insulator is contaminated, the hydrophobicity can migrate to the surface of the contamination layer.
The characteristic is unique to the silicone rubber material. Under the same pollution degree, its pollution flashover voltage can reach more than twice that of the same leakage.
The equivalent diameter of ordinary rod-shaped composite insulators is much smaller than that of ordinary county-type insulators and pillar insulators, which is also an important reason for its excellent pollution resistance. in adverse conditions
Under low pressure, the hydrophobicity may be reduced or lost due to the influence of electrical and environmental stress, but its equivalent diameter will not become mushy, so the pollution flashover voltage will still maintain a high level.
(3) Convenient operation and maintenance. The excellent anti-pollution performance of the organic external insulation improves the reliability of the operation of the power system. It is not necessary to clean regularly like porcelain and glass insulators in polluted areas.
There is also no problem of zero value detection of ordinary suspension porcelain insulators, which greatly reduces the operation and maintenance costs of insulators in polluted areas.
(4) It is not easy to break and prevents accidents. The composite insulator has strong impact resistance, which greatly reduces accidental damage during installation and transportation, and can effectively prevent damage from human factors such as gunshots.