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Power System

Power System :

Insulator

The insulator is used to support and secure the busbar and charged conductor and make sure there is enough distance and insulation between conductors or between the conductor and ground.



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     Glass Insulator Composite InsulatorPorcelain Insulator

Application:

Insulator can guarantee enough insulation existing between the conductor and cross arm/tower. It mainly has two functions in overhead transmission lines, namely, supporting conductor and preventing electric leakage. It should be able to stand the vertical load and the horizonal tensile strength of the conductor when operating. It also stands sunshine, rain, climate changes and chemical corrosion. Therefore, the insulator requires not only good electrical properties, but also enough mechanical strength.

Category:

FRP insulator, porcelain insulator and composite insulator are the most commonly used.

1.Porcelain Insulator
Porcelain insulator consists of ceramic part, iron cap, steel leg, which are cemented by adhesive containing Portland cement and quartz sand. There is a thin resilient coating between iron cap / steel leg and the adhesive and the top of the steel leg has cushion pad. The ceramic surface is usually glazed white or brown, or other colors if necessary and the surface of the iron cap and steel leg is fully hot galvanized.
Features:
1)Small, light weighted, high strength and good electrical property
2)It has almost 100 years operating experience. High anti-aging property. Within a certain working period, faulty insulators can be replaced if detected.

2.Composite Insulator
Consist of the insulator core rod, silicone rubber shed and end fittings. The insulator core rod is an abbreviation of epoxy resin glass fiber drawing rod, which serves as the framework of the composite insulator with several functions, such as bracing the shed, internal insulating, linking end fitting and bearing mechanical load. Its tensile strength, which can reach 600Mpa, is twice that of normal steel, 5-8 times that of ceramic materials. Good dielectric property, chemical resistant, good bending fatigue resistance, anti-creep and anti-impact. The main function of the silicone rubber shed is protecting the rod, shielding against rain and snow, increasing creep distance and external insulation. It uses macro-molecule polymer silicone rubber as the matrix, added with flame retardant, anti-aging agent, coupling agent and other fillers, then vulcanized under high temperature and high pressure. It has sound hydrophobicity and mobility as well as good corrosion resistance, aging resistance, electrical insulation and other properties.
Feature:
1)Made of special steel and labyrinth design principle for the fitting end is adopted. It also has multi-layer protection and good sealing, solving insulator’s most critical problem -- interface electrical puncture.
2)The core rod adopts ERC high temperature, acid-proof rod. A special coupling agent is applied to the interface of the rod and silicone rubber.
3)The shed adopts high temperature and high pressure one-step forming process, coupled with PC monitored post vulcanization, extending product working life. The product is especially applicable to heavily contaminated areas, with environment temperature ±40℃ and altitude of not more than 2000m.

3.Glass Insulator
Consist of iron cap, armored glass part and steel leg, cemented  as a whole by cement compo.
Feature:
1)It adopts the most advanced design-cylindrical head structure, featured by small head size, light weight, high strength and large creep distance, saving metal and lowering transmission line cost.
2)Glass insulator is used in AC/DC electric transmission lines of HV and EHV. The application of glass insulator for insulation and suspension conductor is featured by self-shattering. Observation from ground or helicopter is enough, no need to check by pole ascending, which reduces labor intensity.
3)The lighting struck surface of the in-service glass insulator remains smooth with tempered internal stress protection layer, which, enable the insulator to maintain enough insulating property and mechanical strength.

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