IEEE Std C37.20.9:2019 pdf download
This standard covers the design, testing, and intallation of metal-enclosed switchgear that incorporates gas (typically SFJ at higher than ambient pressure as an insulation medium for alternating-current applications rated above I kV to 52 kV. The contents of the switchgear may include but are not limited to circuit breakers, switches, bushings, buses, instrument transformers, cable […]
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