Specification

The table above is just one of our product parameters. If you want more information, please get in touch with info@wishpower.net

What is Silicone Composite Insulator?

The silicone composite insulator is a high-performance insulator intended for application in electrical power networks, which consists of a fiberglass-reinforced resin core and a silicone rubber outer layer. The combination of these materials is highly preferable for its mechanical strength and electrical insulation, respectively. The silicone rubber housing has excellent environmental stress resistance, e.g., ultraviolet (UV) radiation, moisture, and pollution, and is therefore particularly suitable for use in outdoor applications that are prone to contamination or severe weather. By being hydrophobic, the silicone minimizes the probability that conductive water films will form on the insulator’s surface, reducing the probability of flashover and providing reliable operation even when the environment is wet and polluted. Also, They are lighter than conventional porcelain or glass insulators as a result they are easier to handle and install and the load on supporting structures is reduced. Another advantage is their flexibility in design, which provides better performance under such mechanical stresses as bending and torsion.

Composite insulator types

1. Composite Insular

This type is used to support the conductor in overhead transmission lines, and hangs from the tower, providing mechanical and electrical insulation between the conductor and supporting structure. Due to its lightweight design and high durability, it is in widespread use in high-voltage transmission systems.

2. Post Composite Insulator

Post composite insulators are specifically designed for vertical or horizontal mounting on poles, or substation equipment to provide support for electrical conductors while dampening the energy (insulation). Substations and distribution systems use them.

3. Strain Composite Insulator

This type is used to bear high tensile loads in the transmission line when it changes its direction or terminates. Resisting mechanical stress while still insulating properly strain composite insulators is ideal.

4. Line Post Composite Insulator

Line post composite insulators are typically mounted on cross arms or poles and support conductors under tension in distribution lines. Bending resistant to high load and for areas with strong winds or heavy ice.

5. Pin Composite Insulator

Usually used in lower voltage distribution systems, pin composite insulators are mounted on cross arms of poles directly. A robust design is used, which results in solid insulation and physical line integrity.

Composite insulators vs porcelain

The silicone rubber composite insulator comprises a fiberglass core and an organic shell. Its superior properties for lightweight construction, flexibility, and resistance to environmental degradation make silicone rubber an attractive choice. Hydrophobic properties minimize the risk of water-related flashovers enhancing performance in polluted or humid atmospheres, and giving them better resistance to cracking to act ring under mechanical stress. This lighter and easier to install reduces the load on supporting structures and correspondingly reduces transportation costs.

Ceramic materials are used in making porcelain insulators, which have been used in power systems for decades. Though trusted for their longevity and reliability, porcelain insulators are heavier, and more brittle, than composite insulators. Cracking of the fragile material during impact or installation, as well as increased surface contamination as a result of high pollution, makes them prone to maintenance problems.

Inspection before leaving the factory

Mechanical Tests

Tensile Strength Test: This test measures the mechanical tension at which the insulator will fail — the mechanical loads it will experience in service before the insulator breaks.

Bending Test: Performed to confirm resistance to bending forces induced by wind or line sag.

Impact Resistance Test: It guarantees the insulator isn’t damaged during accidental impact or shock during transport or installation.

Electrical Tests

Flashover Voltage Test: This test also ensures the maximum voltage at which the polymer insulators will flash over under normal conditions and verify its insulating ability.

Withstand Voltage Test: The insulator is evaluated to determine the ability to withstand the high voltage without breaking down, giving reliable performance in high-voltage applications.

Leakage Current Test: Its hydrophobicity and electrical integrity are measured by this test which tests for the amount of current that leaks over the surface of the insulator in wet or contaminated conditions.

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