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In air blast circuit breakers, compressed air at a pressure of 20 30 kg/cm 2 is employed as an arc quenching medium.Air blast circuit breakers are suitable for operating voltage of 132kV and above. Creepage Distance for Insulators in Substation Switchgear Protection Creepage Distance for Insulators: The creepage distance for insulators is the shortest distance along the insulator surface
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IEC Medium Voltage Switchgear. Eaton's medium voltage switchgear systems are based on the use of vacuum circuit breakers combined with solid insulation material. This is an environmentally friendly technology in comparison with the methods used by many other suppliers, which use SF6 as an insulation medium.
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2010/11/10A gas insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase tophase and phase to ground insulation. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in SF6 gas inside grounded metal enclosures. Gas Insulated Substations – GIS.
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