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Epoxy Stand-Off Insulator up to 40.5kV
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EPOXY SUPPORT INSULATORS 7.2 TO 123KV
An electrical insulator casted with epoxy resin and hardener. Insulators could be made from an indoor epoxy resin system like a Bisphenol A-epichlorohydrin resin and an anhydride hardener of from an UV and waterproof outdoor epoxy system like a cycloaliphatic epoxy resin and hardener.
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Description
Epoxy stand-off (also called bus support) insulators are used as mechanical supports that provide the necessary electrical clearances for conductors and other current carrying components. They can be used in a variety of indoor and outdoor applications such as in switchgear bus supports, transformers, station posts, and other special power apparatus. The design and testing of stand-off insulators should comply with the electrical and mechanical industry standards, including ANSI, IEEE, IEC, and NEMA.
When selecting insulators for a project, there are several important design requirements to consider:
- Application, where and how the insulator is being used and installed including environmental factors such as pollution, ambient temperature, and UV exposure.
- Voltage class
- Mechanical strength requirements
- Cantilever strength - the amount of weight a wall mounted insulator will support when something is hung on it.
- Tensile strength - the amount of stress that an insulator will withstand when pressure is applied pulling straight up on the bolt in the insert.
- Torsion strength - the amount of stress that an insulator will withstand when twisted by an applied torque.
- Compression strength - the amount of weight an insulator will support with a direct vertical application of pressure.
- Mounting configuration
- Dimensional control of height and creep
- An insulators height determines the distance that will separate a source of voltage from ground or other components.
- Creep (leakage) distance is the shortest distance on the surface of insulator between two conductive parts. Creep occurs when contamination builds up on the surface of an insulator and provides a conductive path for current to flow. It can be controlled by the design of an insulator’s sheds and shape, for instance, a deep shed design offers more generous creep distances.
- Material used
- Epoxy insulators offer a high tolerance to physical impact and will not shatter when subjected to thermal or mechanical forces. They also offer a very high electrical breakdown strength.
- Epoxy is homogeneous. If the surface is damaged, material underneath provides the same properties.
- Epoxy is economical even for low production volumes
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