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IEEE PC57.93 DRAFT
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IEEE PC57.93 DRAFT 2018 Edition, February 1, 2018 Guide for Installation and Maintenance of Liquid Immersed Power Transformers
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Description / Abstract:
The recommendations presented in this guide apply to the inspection, installation, and maintenance of liquid-immersed power transformers rated 501 kVA and above with secondary voltages of 1000 V and above. This guide covers the entire range of power transformers, including extra high-voltage (EHV) transformers. This guide does not cover special transformers such as furnace transformers, rectifier transformers, etc. Distinctions are made as required for various MVA ratings, voltage ratings, and types of liquid insulation.
Clause 4 contains information for use with transformers rated below 10 MVA with high voltages less than 69 kV. Clause 5 applies to transformers rated 10 MVA and above with primary voltages of 69 kV and above, including EHV transformers. For transformers with primary voltages that are less than 69 kV and larger than 10 MVA, users shall follow 4.1.
Clause 4 contains information for use with transformers rated below 10 MVA with high voltages less than 69 kV. Clause 5 applies to transformers rated 10 MVA and above with primary voltages of 69 kV and above, including EHV transformers. For transformers with primary voltages that are less than 69 kV and larger than 10 MVA, users shall follow 4.1.