IEEE 1277-2020 pdf download.IEEE Standard General Requirements and Test Code for Dry-Type and Oil-Immersed Smoothing Reactors and for Dry-Type Converter Reactors for DC Power Transmission 4. Letter symbols A altitude A o standard reference altitude of 1000 m 5. General requirements—Systems and environmental data 5.1 Usual service conditions 5.1.1 General
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