Transcription of Lightning and surge protection - basic principles
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Lightning and surge protection - basic principles
Lightning and surgeprotection - basic principles October 2016AN904-1002 Rev IApplication noteMTL surge protectionCONTENTS ..Page1 INTRODUCTION ..1 The need for surge protection ..1 surge protection devices (SPDs) ..12 Lightning ..2 Introduction ..2 Generation of atmospheric discharges ..2 Lightning conductors and buildings ..2 Lightning -induced transients ..3 Transient specifications ..33 surge protection COMPONENTS ..4 Introduction ..4 Arc or carbon spark gaps ..4 Gas discharge tubes ..4 Zener diodes ..5 Metal oxide varistors ..5 Fuses ..6 surge relays ..6 Circuit breakers ..6 Multistage hybrid circuits ..64 surge protection DEVICES (SPDs) ..6 Introduction ..6 basic multistage hybrid circuits ..65 ..8 The need for protection ..8 Loop protection general ..8 SPD selection general ..8 surge protection for industrial process systems ..8 surge protection for building systems and communications networks.
Surge protection devices should ideally operate instantaneously to divert a surge current to ground with no residual common-mode voltage presented at the equipment terminals. Once the surge current has subsided, the SPD should automatically restore normal operation and reset to a state ready to receive the next surge.
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