IEEE C57.12.51-1981 pdf free.American National Standard Requirements for Ventilated Dry-Type Power Transformers, 501 kVA and Larger,Three-Phase,with High-Voltage 601 to 34 500 Volts,Low-Voltage 208Y/120 to 4160 Volts.
All requirements, definitions, and tests, except as specifically covered in this standard, shall be in accordance with theAmerican National Standards listed below (see 2.3). When referred to in this document, standards are identified bydesignation and year (for example,ANSI/IEEE C57.12.01-1979).
American National Standard for Unified Inch Screw Threads (UN and UNR Thread Forms),ANSI B1.1-1974
American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500kVA,Single-Phase, and 15 to 500kVA,Three-Phase; with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 to 600 Volts, ANSIC57.12.50-1981
American National Standard Requirements for Sealed Dry-Type Power Transformers, 501 kVA and Larger, Three-Phase; with High-Voltage 601 to 34 500 Volts, Low-Voltage 208Y/120 to 4160 Volts,ANSI C57.12.52-1981
American National Standard Terminal Markings and Connections for Distribution and Power Transformers,ANSIC57.12.70-1978
American National Standard Guide for Installation and Maintenance of Dry-Type Transformers，ANSl AppendixC57.94 (1958)
American National Standard Guide for Application of Valve-Type Lightning Arresters for Alternating-CurrentSystems,ANSI C62.2-1980
American National Standard Voltage Ratings for Electric Power Systems and Equipment (60 Hz),ANSI C84.1-1977and C84.1a-1980
American National Standard General Requirements for Dry-Type Distribution and Power Transformers,ANSVIEEEC57.12.01-1979
American National Standard Terminology for Distribution and Power Transformers,ANSIIEEE C57.12.80-1978
American National Standard Test Code for Dry-Type Distribution and Power Transformers,ANSIIEEE C57.12.91-1979
American National Standard Requirements for Instrument Transformers,ANSIIEEE C57.13-1978
American National Standard Guide for Application of Transformer Connections in Three-Phase Distribution Systems,ANSI/IEEE C57.105-1978
American National Standard Dictionary of Electrical and Electronics Terms,ANSI/IEEE 100-1977
A minimum of two lifting points shall be provided for lifting the core and coil assembly separately, using one liftingcable at each lifting point.
Lifting facilities shall be provided for lifting the complete transformer. Lifting facilities shall be designed for liftingusing one lifting cable at each lifting point, and with a maximum cable angle of 30 degrees with respect to the vertical.Lifting points shall provide a balanced lift to prevent overturning.The bearing surfaces of lifting facilities shall be freefrom sharp edges and shall be provided with a hole having a minimum diameter of 2.0 inches (51 mm) for guyingpurposes. NOTES:
1-Depending on the design and the manufacturer’s instructions,it may be necessary to have the cover in place when lifting.or it may be necessary to remove the cover to engage the lifting cables with the lifting facilities.
2- A spreader bar may be required to prevent enclosure damage if lifting from the base or side structure, as specified in the manufacturer’s instructions.IEEE C57.12.51 pdf download.