February 1, 1960 - IEEE

This standard covers electrical char¬acteristics and mechanical features of 3-phase, 60- cycle, 2-winding, mineral-oil-immersed indoor transformers rated 250 to 35000 kva, inclusive, high voltage 2400 to 34400 volts, inclusive, used for sup¬plying electric power to direct arc ferrous-melting...

NEMA TR 1 - Transformers, Step Voltage Regulators and Reactors
January 1, 2013 - NEMA

This standards publication applies to single phase and poly phase power and distribution transformers (including step-voltage regulators and reactors). This standard excludes dry type transformers covered by NEMA ST20. This publication provides a reference list of applicable...

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NEMA TP 2 - Standard Test Method for Measuring the Energy Consumption of Distribution Transformers
January 1, 2005 - NEMA

Provides the basis for determining the energy efficiency of single- and three-phase dry-type and liquid-immersed distribution transformers and assists with the proper selection of such equipment. This standard is intended for use as a basis for determining the energy efficiency performance...

NEMA ST 20 - Dry-Type Transformers for General Applications
January 1, 2014 - NEMA

This standards publication applies to single-phase and polyphase dry-type transformers (including autotransformers and non-current-limiting reactors) for supplying energy to power, heating, and lighting circuits and designed to be installed and used in accordance with the National Electrical...

IEEE C57.110 - Recommended Practice for Establishing Liquid Immersed and Dry-Type Power and Distribution Transformer Capability when Supplying Nonsinusoidal Load Currents
June 14, 2018 - IEEE

This recommended practice applies only to two winding transformers covered by IEEE Std C57.12.00, IEEE Std C57.12.01, and NEMA ST20.1 It does not apply to rectifier transformers.2 Purpose The purpose of this document is to establish uniform methods for determining the...

ANSI C12.9 - Test Switches and Plugs for Transformer-Rated Meters
January 1, 2014 - NEMA

This standard is intended to encompass the dimensions and functions of meter test switches used with transformer-rated watthour meters in conjunction with instrument transformers and test plugs used in conjunction with the test switch.

NEMA TP 3 - Standard for the Labeling of Distribution Transformer Efficiency
January 1, 2000 - NEMA

Defines the labeling of distribution transformers tested to the efficiency levels specified in TP 1. This standard defines the labeling of distribution transformers tested to the efficiency levels specified in TP 1. The label shall be affixed to the transformer in a permanent...

ANSI C12.11 - Instrument Transformers for Revenue Metering 10 kV BIL through 350 kV BIL (0.6 kV NSV through 69 kV NSV)
January 1, 2007 - NEMA

The NEMA Smart Meter Package provides the requirements and guidance on electricity metering, watt hour meter sockets, device data tables, meter interfacing to data communication networks and type 2 optical ports. NEMA Smart Meter Package also establishes performance criteria for...

September 5, 2013 - DOD

This drawing describes the requirements for a low power pulse transformer. This drawing provides for a level of transformer quality and reliability assurance for acquisition of type TP7SXNNNNKZ low power pulse transformer in accordance with MIL-PRF-21038.