Transcription of Understanding TVSS and its Application
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Understanding TVSS and its Application
Understanding tvss and its ApplicationChris M. Finen, EngineerEaton ElectricalOverviewBackgroundTest waveforms and standardsTVSS FeaturesApplication and Mounting ConsiderationsNEC Code Compliance Changes in 2005 tvss Overcurrent Coordination SafetyUpcoming UL1449 ChangesIndustry MythsSpecification GuidelinesYou Can t Afford to Take RisksEach year, there are over $1 billion worth of lightning-related insurance industry lossesNashville Area averages 6strikes/km2 per yearLightning Activity stats for the USHow Does tvss Work? tvss is a passive, parallel connected deviceUnder normal circumstances, tvss has extremely high impedance to groundSurgeCurrent, KAMOVsLoadLG During a surge event, the tvss instantly changes to a very low impedance Surge is shunted to groundStandard (current revision date)Purpose of Standard/CommentsUL 1449 (1987) - Transient VoltageSurge Suppressors1. Safety Test (constructed of approved components in a safe manner).
IEEE Emerald Book Reference manual for the operation of electronic loads (includes grounding, power requirements, etc.) NEMA LS-1 NEMA Technical Committee guide for the specification of surge protection devices including physical and operating parameters. NEC National Electrical Code articles 245, 680 and 800
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