Transcription of Simplified selection procedure
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Simplified selection procedure
B-3 ABB Surge Arresters Buyer s GuideEdition 4, 2003-10 ABB Surge Arresters Buyer s GuideC-1 Edition 4, 2003-10 selection of arresterSimplified selection procedureFor a detailed selection Guide, please refer to ABB publications PTHVP/A 2300E and PTHVP/A 2310E. The catalogues list the available standard arresters from ABB of por-celain-housed arresters type EXLIM and silicone polymer-housed arresters, type PEXLIM. The selection is carried out in two major steps: Matching the electrical characteristics of the arresters to the system s electri-cal demands Matching the mechanical characte-ristics of the arresters to the system s mechanical and environmental final selection is reflected in the arres-ter type system voltageUcContinuous operating voltageUrRated voltageTOVT emporary overvoltageTTOV strength factorkEarth fault factorUpsSwitching impulse protective levelUplLightning impulse protective levelUwsSwitching impulse withstand levelUwlLightning impulse withstand levelC-2 ABB Surge Arresters Buyer s GuideEdition 4, 2003-10 ABB Surge Arresters Buyer s GuideC-3 Edition 4, 2003-10 selection of arrester Flowchart for Simplified selection of surge arrestersC-2 ABB Surge Arresters Buyer s GuideEdition 4, 2003-10 ABB Surge Arresters Buyer s GuideC-3 Edition 4, 2003-10 selection of arresterSystem EarthingFaultDura-tionSystem VoltageUm (kV)Min.
discharge class IEC classifies arresters by their nominal discharge current. For 10 and 20 kA arres-ters, they are also classified by energy capa-bility expressed as line discharge class (2 to 5) verified in a long duration current test and a switching surge operating duty test. In the latter, the arrester is subjected to two
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