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Lightning Protection System Design and Installation ...

Hong Kong Polytechnic UniversityggyyDepartment of Building Services EngineeringLightning Protection System Design and Installation Reviewand Installation ReviewOrganised by Prof YP DuDr Tony Sung BSc(Hon) MSc PhD FIET FCIBSE MIEE SenMIEEEAdjt P fAdjunct ProfessorChairman of CIBSE Electrical Services 2012 Slide no: 1 Adjunct Prof Tony SungOutline of LectureOutline of Lecture Fundamental of Lightning PhenomenaPhenomena Standards and Design Guides Important Terms Quantifying Risks Quantifying Risks Control Measures Th R l W ld The Real World ConclusionDec 2012 Slide no: 2 Adjunct Prof Tony SungTheory of LightningTheory of Lightning (ref: Furse Guide to BS EN 62305)Dec 2012 Slide no: 3 Adjunct Prof Tony SungSeparation of ChargesSeparation of ChargesHow charges build up in the cloud is not well understood but the separation of charges in thethe separation of charges

Electric fields of up to 500kV/m can occur before a lightning strike, over an area of up to 100m from the eventual strike point. These can induce damaging currents into conductors and devicesconductors and devices. ... lightning strikes.

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