12.07.2015 Views

13 - Curriculum Development Centre, Kalamassery

13 - Curriculum Development Centre, Kalamassery

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UNIT-VEarthing and Lightning arrestersSurges – causes of transient- over voltage- mechanism of lightning phenomena-lightning strokes- -Lightning arresters- thyrite lightning arrestor – surge absorbers –-rod gap, sphere gap, horn gap, multiplegap arresters-testing of arrestersEarthing-effects on human body-soil resistivity and measurement-earthing mat-size of earthing conductorPower stations – substations and electrical apparatus protection by ground wire – Neutral grounding –comparison of Earthed and isolated three phase systems - Types of grounding - description of solid -resistance and reactance earthing of neutral – earthing transformers-sub station earthingREFERENCE BOOKS1. A Text Book of Electrical Technology, Vol. III - B.L. Theraja2. Principles of Power System - V.K. Mehta3. Utilization of Electrical Energy - N.V.Surya Narayana4. Switch gear & Protection - J.B.Gupta5. Principle of Switch gear & Protection - Sunil S Rao122

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