Due to the weather changing, ceramic suspension insulator will be breakdown by lightning, when the same time voltage is called breakdown voltage.

Ceramic suspension insulator application:
An ceramic suspension insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field. A perfect ceramic suspension insulator does not exist, because a portion of the ceramic suspension insulator could becoming electrically conductive if the voltage applied across it exceeds the breakdown voltage. This is known as breakdown voltage of an ceramic suspension insulators. Some materials such as glass, porcelain and composite, which have high resistivity, are very good electrical insulators. A much larger class of materials, even though they may have lower bulk resistivity, are still good enough to insulate electrical wiring and cables. Examples include rubber-like polymer insulator. Such materials can serve as practical and safe insulators for low to moderate voltages .

                   
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Ceramic suspension insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves. The ceramic suspension insulator is also used more specifically to refer to insulating supports used to attach electric power distribution or transmission lines to utility poles and transmission towers. They support the weight of the suspended wires without allowing the current to flow through the tower to ground.

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