IEEE C57.12.10-2010

1 Introduction and scope
   1.1 Introduction
   1.2 Scope
   1.3 Mandatory requirements
2 Referenced and related standards
   2.1 Referenced American National Standards
   2.2 Related standard
3 Terminology
4 Rating data
   4.1 Usual service conditions
   4.2 Kilovolt-ampere ratings
   4.3 Kilovolt-ampere and voltage ratings
   4.4 Insulation levels
   4.5 Taps
   4.6 Impedance voltage
   4.7 Top-liquid temperature-range limits
   4.8 Routine tests
5 Construction
   5.1 Accessories
   5.2 Bushings
   5.3 Lifting, moving, and jacking facilities
   5.4 Nameplate
   5.5 Ground pads
   5.6 Polarity, angular displacement, and terminal markings
   5.7 Liquid preservation
   5.8 Tanks
   5.9 Auxiliary cooling equipment
   5.10 Power supply for transformer auxiliary equipment and
        controls
6 Basic construction features - load-tap-changing equipment
   6.1 Load-tap-changing equipment
   6.2 Arcing tap switch
   6.3 Motor-drive mechanism
   6.4 Position indicator
   6.5 Control equipment and accessories
7 Alarm contacts
8 Other ratings
   8.1 Other kilovolt-ampere ratings
   8.2 Other high-voltage ratings
   8.3 Other winding ratings and connections
   8.4 Other basic impulse insulation levels (BILs) and
        impedance voltages
9 Other construction features - general
   9.1 Other bushings
   9.2 Other neutral terminations
   9.3 Terminal board
   9.4 Junction boxes
   9.5 Disconnecting switches with interlocks and terminal
        chambers
   9.6 Throat connections
   9.7 Temperature and liquid-level indicator contacts and wiring
   9.8 Current transformers
   9.9 Provision for future forced-air cooling
   9.10 Pressure-type relay
   9.11 Moving facilities
   9.12 Surge arresters
   9.13 Other oil preservation systems
   9.14 Other insulating liquid
   9.15 Other tanks
   9.16 Other loading
   9.17 "Other" tests
10 Other construction features - load-tap-changing equipment
   10.1 Terminal blocks
   10.2 Paralleling circuit and operation
   10.3 Omission of automatic load-tap-changing control
   10.4 Lightning surge voltage protector for motor power supply

Describes certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of 60-Hz, two-winding, liquid-immersed transformers, and used for step-down or step-up purposes.