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Surge arrester |
Also found in: Wikipedia | 0.15 sec. |
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Surge arrester A protective device designed primarily for connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equipment. A lightning arrester is really a voltage-surge arrester. The valve arrester consists of disks of zinc oxide material that exhibit low resistance at high voltage and high resistance at low voltage. By selecting an appropriate configuration of disk material, the arrester will conduct a low current of a few milliamperes at normal system voltage. During conditions of lightning or switching surge overvoltages, the surge current is limited by the circuit; and for the magnitudes of current that can be delivered to the arrester location, the resulting voltage will be limited to controlled values, and to safe levels as well, when insulation levels of equipment are coordinated with the surge arrester protective characteristics. A typical surge arrester consists of disks of zinc oxide material sized in cross-sectional area to provide desired energy discharge capability, and in axial length proportional to the voltage capability. The disks are then placed in porcelain enclosures to provide physical support and heat removal, and sealed for isolation from contamination in the electrical environment. See Lightning and surge protection How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | |
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| The discount is offered for homeowners who install a system that includes a lightning rod, surge arresters for the electrical entrance and surge suppressors for the resident's electronic devices. HV 1650-50 silicone rubber (Type ASTM D 1418 VMQ) is a 50 durometer hydrophobic material designed with low modulus primarily for molding surge arresters. CPS manufactures distribution transformers, distribution switchgear, reclosers, capacitors, protective relays, voltage regulators, automated switches, cable accessories, surge arresters, transformer components and dielectric coolants, fuses, tools and engineering services for the electrical utility and industrial markets. |
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