23 Protection against overvoltage Multi gap Arrester

Protection against over voltage- Expulsion Type Arrester(Protector Tube),rod gap arrester,enclosed,chamber,gas fibre,two spark gap in series,over voltage,series sparking of gap,arc,vaporizes the material of the fibre,arc extiguish,arc quench ,natural zero, easily installed,limited operations,cheap,block power frequency,enclosed operation ,not feasible,poor volt-ampere characteristics