#insulator 33 kv disc

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What are the types of disc insulators?

Insulators have many types, like shackle, strain, suspension and pin insulator. The insulators work to provide necessary insulation between line conductors and supports and thus prevent any leakage current from conductors to earth which is as important as conductors in the external overhead electrical system. Further information is as following.

A high-quality disc insulator must have high mechanical strength in order to withstand conductor load, wind load etc as well as high electrical resistance of insulator material in order to avoid leakage currents to earth. Besides that, they should be made by high relative permittivity of insulator material in order that dielectric strength is high. The insulator material be non-porous, free from impurities and cracks otherwise the permittivity will be lowered with a high ratio of puncture strength to flashover.

The most commonly used material for insulators of overhead lines is ceramics, but glass, talc and materials with special components are also used to a certain extent. Porcelain is made by firing a mixture of kaolin, feldspar and Shi Ying at high temperature. It is mechanically stronger than glass, and has less trouble in leaking and is less affected by temperature changes.

Different types of insulators in transmission lines:

The most commonly used are pin type, suspension type, strain insulator and shackle insulator.

NO.1 pin insulators

As the first overhead insulator, pin insulators are commonly used among transmission lines with 33kv voltage or lower voltage. Pin insulators can be divided into ordinary type (single umbrella), double umbrella type or three umbrella type, and the choice of these insulators depend mainly on the line voltage. In 11 kV power system, we usually use ordinary pin insulator, that is, the whole pin insulator has only one umbrella canopy.

There are two main reasons for the design of pin insulator umbrella skirt. First of all, since the leakage path of an insulator is through its surface, the leakage distance can be extended by increasing the vertical length of its surface area in the manufacturing process of an insulator. In other words, providing one, two or more canopy or umbrella skirts on the insulator body can make it obtain a longer creep distance. In addition, beside increasing creepage distance, the insulator skirt design has another purpose: when it rains, the outer surface of the umbrella skirt will be wet by rain, but the inner surface will remain dry and non-conductive, thus interrupting the conduction of current on the wet pin insulator surface.

In 33 kv and 66 kV high voltage power system, ordinary pin insulator is difficult to perform the task of high voltage porcelain. Because the higher the voltage, the thicker the insulation layer required to ensure adequate insulation during operation. In this case, power systems prefer multi-umbrella pin insulators, in which multiple umbrella skirts are fastened together to form a complete insulator unit. And 33 kv power system generally uses double umbrella type pin insulator, 66 kV power generally uses three umbrella type pin insulator.

NO.2 suspension insulator

As we mentioned above, with the voltage increasing the costs of using ordinary pin insulator are also growing. Therefore, it is not economical to apply pin insulator in a high voltage transmission line. But suspension insulator could work in transmission lines with a high voltage. Suspension insulator is commonly used in high voltage transmission lines. Suspension insulators can be divided into disk type suspension insulators and rod type suspension insulators. Disk-type suspension insulators are the most widely used insulators in transmission lines. Rod type suspension insulators have been widely used in Germany and other countries.

Suspension insulators consist of several porcelain plates, which are connected in series by metal links in the form of strings. The conductor is carried by the bottom insulator, while the top insulator is fixed to the cross arm of the tower. A single insulator plate can be used for low voltage lines, while multiple insulator plates connected in series can be used for higher voltage lines. For example, six 11kV insulator plates connected in series can be used for 66kV transmission and distribution lines.

NO.3 strain insulator

Strain insulator is an important part of transmission line, including porcelain strain insulator, composite strain insulator and glass strain insulator. Strain insulators can effectively isolate  conductors from the ground based on keeping the position of each conductor unchanged, futher to enhance the safety of transmission line environment.

In the daily operation and maintenance of transmission lines, the geographical environment and weather conditions of transmission lines are complex and changeable, and insulators will inevitably be damaged. Tension insulator is the most common product in transmission lines, which is often used together with matching hardware fittings to achieve the function of high voltage electrical porcelain insulation. In addition, in actual business, according to the construction needs of power system, the construction party also combines several tension insulators to meet the tension requirements of transmission lines.

NO.4 shackle insulator

Shackle insulators (also known as spool insulators) are usually used in low voltage transmission lines. It can be used in both the horizontal or vertical positions. With the increasing number of underground cables for distribution purpose, the application of such insulator has decreased rapidly.

If you are looking for a disc insulator supplier, we are looking forward to be your first choice as JiangDong Group Co,Ltd, a professional insulator manufacturer, has engaged in telecom, power, renewable energy for 26 years. If you have any need, please feel free to contact us.

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