Substation Faults and Protection

Lingua: inglese

Editore: GRIN Verlag, 2013

3656412332 / 9783656412335

Da: AHA-BUCH GmbH, Einbeck, GermaniaAHA-BUCH GmbH

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Druck auf Anfrage Neuware - Printed after ordering - Technical Report from the year 2011 in the subject Engineering - Power Engineering, grade: A, ( Atlantic International University ) (Niger Delta University), course: SFP 673, language: English, abstract: The purpose of this work is to establish the type of faults that may result when substations are sited in the region of the Niger Delta due to the prevailing climatic conditions. This will aimed at ensuring as far as possible a small probability of damage to substation insulations.For most transmission lines, relatively large numbers of yearly flashovers are permitted but such number of insulation damages is absolutely not allowed for substations. Flashover of insulation at substation means a short circuit on the busbar which even with the modern means of relay protection can cause most sever system damages. Substations unlike lines have very low probability of damage therefore a quantitative idea of the probability, the so called index of lightning resistance of a substation is used. It is equal to the calculated number of years during which a voltage dangerous for the substation installation does not occur. For modern high voltage substations, the index of lightning resistance is calculated as hundred or even as thousand years which is a proof of attempts made by designers to ensure the largest degree of lightning resistance of substation (Rao,2008,U.S Dept of Agri.2001,Martinez and Castro 2003).Substations must be protected from the direct lightning strokes and voltage waves travelling from the line as well as switching surges. In transmission lines the induced strokes (indirect strokes) due to lightning are important for 11kv lines only. For high voltage transmission lines (up to 220kv) the surges due direct lightning strokes determine the line insulations design. For extra high voltage (400kv and above) the severity of swiching surges is much more than that due to lightning (Gupta, 2008). Whether external or internal over voltage, for reliable operations of substation proper protection is necessary. There are factors that may not produce over voltage but are capable of affecting the operation of the equipments as well as lowering the flashover, these are humidity, rain temperature, pressure and to some extent contamination on the surface of insulator and equipments (outdoor).For proper consideration of these factors with the external and internal over voltages, a proper selection of protective devices may be made for the safe operation of substation.

Codice articolo 9783656412335

Titolo
Substation Faults and Protection
Autore
John Tarilanyo Afa
Editore
GRIN Verlag
Anno di pubblicazione
2013
Condizione
Neu
Rilegatura
Taschenbuch
Lingua
inglese
ISBN 10
3656412332
ISBN 13
9783656412335
Peso dell'articolo
51 grammi
Dimensioni
210x148x3 mm

AHA-BUCH GmbH

Einbeck, Germania

Venditore con 5 stelle

Venditore AbeBooks dal 14 agosto 2006

Tariffe di spedizione da Germania a U.S.A.

ArticoloDa 30 a 40 giorni lavorativiDa 7 a 14 giorni lavorativi
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