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SF6 underground substation maintenance systems factorys

Development trends in Substation Designewh.ieee.org/cmte/substations/scm0/Chicago Meeting...· PDF fileSF6 Breakers 2 Chambers/170 kV. SF6 Breakers 1 Chamber/245 kV Disconnectors with open contacts. 1950. 2000. Maintenance Rate (primary system) Evolution of CB´s and DS´s. 420 kV Air blast CB 420 kV Oil minimum CB 420 kV SF6 CB Modern CB´s require maintenance 15 years+, however open air DS´s unchanged 1950 2000

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