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1、definition

Substation high voltage disconnect switch with hybrid post insulator(Porcelain cores replace FRP core rods) is composed of silicone rubber shed, high-strength porcelain core and end fittings. The porcelain core, as the internal of the insulator, not only plays an important role in internal insulation but also ensures the mechanical connection and support of the insulator. The high-strength porcelain core adopts high-strength porcelain material formula and advanced isostatic dry molding process, which gives the product a large margin in mechanical strength. Inject silicone rubber on the surface of the porcelain core not only ensures the stable mechanical properties of the porcelain insulator, but also has the characteristics of hydrophobicity and strong resistance to electrical corrosion of the composite insulator. Currently it is widely used in UHV projects.

2、Standards

IEC 60273 Characteristics of Indoor and Outdoor Post Insulators for Systems with Nominal Voltages Greater Than 1000 V

GB/T 8287.2 “Indoor and outdoor post insulators for systems with a nominal voltage higher than 1000V – Part 2 Dimensions and Characteristics”

GB/T 25096 “Definition, test methods and acceptance criteria for station post composite insulators for substations with AC voltage higher than 1000V”

3、Technical requirements for porcelain parts

Porcelain parts should comply with the requirements of GB/T 772;
The porcelain parts are made of high-grade, tight and uniform raw materials, manufactured by isostatic dry molding, and sintered completely and uniformly;
The porcelain parts of the insulator that are not glued to the flange meet the impact test requirements;
The porcelain parts of the insulator are subject to ultrasonic flaw detection one by one in accordance with the provisions of JB/T 9674;
The porcelain parts of the insulator should be subjected to a temperature cycle test as required before glue installation.

4、Hybrid post insulator(Porcelain cores replace FRP core rods) advantages

1.Stable and reliable mechanical properties

The connection area between porcelain core (replace FRP core rod) and metal accessories adopts cement adhesive structure, which is characterized by low temperature influence, high mechanical strength, and almost unaffected by corrosion. High strength porcelain core is used to ensure the rigidity of the product and almost no deformation under mechanical bending load.

2.Excellent resistance to pollution and flashover

Because the silicone rubber sheath has good hydrophobicity and hydrophobicity migration, it improves the power frequency wet flashover voltage and anti-fouling flashover ability. At the same time, the silicone rubber housing has a good wind and rain self-cleaning ability, the pollution accumulation speed is slow, and the artificial water washing and cleaning is also very convenient, especially in the dust pollution environment, the more the best.

3.Strong impact resistance

Substation high voltage disconnect switch with hybrid post insulator(Porcelain cores replace FRP core rods) refers to the surface of the porcelain core firmly injected with silicone rubber sheath cover, so that it has good impact resistance. At the same time, because the porcelain is not directly exposed to the air, the frequency of breakdown or explosion of the porcelain caused by sudden changes in environmental temperature difference or lightning strikes is reduced, which greatly reduces the line maintenance cost.

4.Light weight, convenient transportation, installation and maintenance

The weight of the hybrid post insulator(Porcelain cores replace FRP core rods) is 1/3 less than that of the same type of porcelain insulator, thus reducing the installation labor intensity and the load-bearing pressure of the tower. It can withstand the bending distance well on the tensioning string and slow down the damage of periodic impact force on the tower.