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- Surge_arrester abstract "A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. Also called a surge protection device (SPD) or transient voltage surge suppressor (TVSS), this class of device is used to protect equipment in power transmission and distribution systems. (For consumer equipment protection, different products called surge protectors are used.) The energy criterion for various insulation material can be compared by impulse ratio, the surge arrester should have a low impulse ratio, so that a surge incident on the surge arrester may be bypassed, to the ground instead of passing through the apparatus. To protect a unit of equipment from transients occurring on an attached conductor, a surge arrester is connected to the conductor just before it enters the equipment. The surge arrester is also connected to ground and functions by routing energy from an over-voltage transient to ground if one occurs, while isolating the conductor from ground at normal operating voltages. This is usually achieved through use of a varistor, which has substantially different resistances at different voltages.Surge arresters are not generally designed to protect against a direct lightning strike to a conductor, but rather against electrical transients resulting from lightning strikes occurring in the vicinity of the conductor. Lightning which strikes the earth results in ground currents which can pass over buried conductors and induce a transient that propagates outward towards the ends of the conductor. The same kind of induction happens in overhead and above ground conductors which experience the passing energy of an atmospheric EMP caused by the lightning flash. Surge arresters only protect against induced transients characteristic of a lightning discharge's rapid rise-time and will not protect against electrification caused by a direct strike to the conductor. Transients similar to lightning-induced, such as from a high voltage system's fault switching, may also be safely diverted to ground; however, continuous overcurrents are not protected against by these devices. The energy in a handled transient is substantially less than that of a lightning discharge; however it is still of sufficient quantity to cause equipment damage and often requires protection.Without very thick insulation, which is generally cost prohibitive, most conductors running more than a minimal distance, say greater than about 50 feet, will experience lightning-induced transients at some time during use. Because the transient is usually initiated at some point between the two ends of the conductor, most applications install a surge arrester just before the conductor lands in each piece of equipment to be protected. Each conductor must be protected, as each will have its own transient induced, and each SPD must provide a pathway to earth to safely divert the transient away from the protected component. The one notable exception where they are not installed at both ends is in high voltage distribution systems. In general, the induced voltage is not sufficient to do damage at the electric generation end of the lines; however, installation at the service entrance to a building is key to protecting downstream products that are not as robust.".
- Surge_arrester thumbnail Surge_Arresters.jpg?width=300.
- Surge_arrester wikiPageID "19022547".
- Surge_arrester wikiPageLength "5624".
- Surge_arrester wikiPageOutDegree "14".
- Surge_arrester wikiPageRevisionID "682221503".
- Surge_arrester wikiPageWikiLink Category:Electrical_components.
- Surge_arrester wikiPageWikiLink Electric_power_distribution.
- Surge_arrester wikiPageWikiLink Electric_power_transmission.
- Surge_arrester wikiPageWikiLink Electromagnetic_pulse.
- Surge_arrester wikiPageWikiLink Ground_(electricity).
- Surge_arrester wikiPageWikiLink Lightning_arrester.
- Surge_arrester wikiPageWikiLink Lightning_rod.
- Surge_arrester wikiPageWikiLink Lightning_strike.
- Surge_arrester wikiPageWikiLink Metal_oxide_varistor.
- Surge_arrester wikiPageWikiLink Overcurrent.
- Surge_arrester wikiPageWikiLink Surge_protector.
- Surge_arrester wikiPageWikiLink Varistor.
- Surge_arrester wikiPageWikiLink File:Surge_Arresters.jpg.
- Surge_arrester wikiPageWikiLink File:Surge_Arresters_big.jpg.
- Surge_arrester wikiPageWikiLinkText "Surge arrester".
- Surge_arrester wikiPageWikiLinkText "arresters".
- Surge_arrester wikiPageWikiLinkText "surge arrester".
- Surge_arrester hasPhotoCollection Surge_arrester.
- Surge_arrester wikiPageUsesTemplate Template:Commons_category.
- Surge_arrester subject Category:Electrical_components.
- Surge_arrester hypernym Device.
- Surge_arrester type Device.
- Surge_arrester comment "A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. Also called a surge protection device (SPD) or transient voltage surge suppressor (TVSS), this class of device is used to protect equipment in power transmission and distribution systems.".
- Surge_arrester label "Surge arrester".
- Surge_arrester sameAs m.09g82zv.
- Surge_arrester sameAs Katodni_odvodnik.
- Surge_arrester sameAs Q14190856.
- Surge_arrester sameAs Q14190856.
- Surge_arrester wasDerivedFrom Surge_arrester?oldid=682221503.
- Surge_arrester depiction Surge_Arresters.jpg.
- Surge_arrester isPrimaryTopicOf Surge_arrester.