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NEMA - C12.18 - PROTOCOL SPECIFICATION FOR ANSI TYPE 2 OPTICAL PORT Organization: NEMA
Date: 2006-05-02
Description: NEMA Smart Meter Package also establishes performance criteria for thermal demand meters, mechanical demand registers and phase shifting devices used in metering. Test methods for transformer-rated meters and self contained "A" base watt hour meter are included in this package as well as a watt hour safety standard.
IEEE C57.105 - GUIDE FOR APPLICATION OF TRANSFORMER CONNECTIONS IN THREE-PHASE DISTRIBUTION SYSTEMS Organization: IEEE
Date: 1977-06-02
Description: Foreword(This Foreword is not a part of ANSI/IEEE C57.105-1978, American National Standard Guide for Application of Transformer Connections in Three-Phase Distribution Systems.)
NEMA TR 1 - TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS Organization: NEMA
Date: 2013-01-01
Description: This standards publication applies to single phase and poly phase power and distribution transformers (including step-voltage regulators and reactors).
IEEE - ANSI C57.12.22 - TRANSFORMERS - PAD-MOUNTED, COMPARTMENTAL-TYPE, SELF-COOLED THREE-PHASE DISTRIBUTION TRANSFORMERS WITH HIGH-VOLTAGE BUSHINGS, 2500 KVA AND SMALLER: HIGH VOLTAGE, 34 500 GRD Y/19 920 VOLTS AND BELOW; LOW VOLTAGE, 480 VOLTS AND BELOW - REPLACES NEMA C57.12.22-1993 Organization: IEEE
Date: 1993-01-01
Description: This standard and the companion standard on single-phase transformers (ANSI C57.12.21) were prepared by the Subcommittee on Distribution Transformers, Overhead and Pad-mounted, C57.12.2.
NECA NEIS 410 - STANDARD FOR INSTALLING AND MAINTAINING LIQUID-FILLED TRANSFORMERS Organization: NECA
Date: 2013-01-01
Description: Products and Applications Included This standard describes installation procedures for pad-mounted, sealed, self-cooled or fan-cooled, compartmental, single- and three-phase liquid filled distribution and power transformers with primary windings rated from 2400 volts to 35 kV AC, nominal, and rated from 75 kVA through 5000 kVA, and associated accessories, designed for outdoor installation at grade level with underground entrance of primary and secondary conductors, and used for supplying power, heating and lighting loads for commercial, institutional, and industrial use in nonhazardous locations.
IEEE - ANSI C57.12.55 - TRANSFORMERS USED IN UNIT INSTALLATIONS, INCLUDING UNIT SUBSTATIONSCONFORMANCE STANDARD - REPLACES NEMA C57.12.55-1987 Organization: IEEE
Date: 1987-01-01
Description: This standard describes certain electrical, mechanical, and safety requirements and conformance tests for dry-type distribution and power transformers and for autotransformers. These transformers may be either single-phase or polyphase, with ventilated, nonventilated, or scaled enclosures.
IEEE - ANSI C57.12.50 - REQUIREMENTS FOR VENTILATED DRY-TYPE DISTRIBUTION TRANSFORMERS, 1 TO 500 KVA, SINGLE-PHASE, AND 15 TO 500 KVA, THREE-PHASE, WITH HIGH-VOLTAGE 601 TO 34 500 VOLTS, LOW-VOLTAGE 120 TO 600 VOLTS - REPLACES NEMA C57.12.50-1981 Organization: IEEE
Date: 1981-01-01
Description: Dry-type transformers have been covered in the past by a variety of documents, including American National Standard General Requirements for Distribution, Power, and Regulating Transformers, ANSI C57.12.00- 1973; American National Standard Test Code for Distribution, Power, and Regulating Transformers, ANSI C57.12.90- 1973; American National Standard Dry-Type Transformers for General Applications, ANSI/NEMA ST 20-1 972; and Commercial, Institutional, and Industrial Dry-Type Transformers, NEMA TR 27-1965 (R1976).
NEMA - C57.12.21 - PAD-MOUNTED, COMPARTMENTAL-TYPE, SELF-COOLED, SINGLE-PHASE DISTRIBUTION TRANSFORMERS WITH HIGH-VOLTAGE BUSHINGS; HIGH -VOLTAGE, 34 500 GRDY/19 920 VOLTS AND BELOW; LOW-VOLTAGE, 240/120 VOLTS; 167 KVA AND SMALLER, REQUIREMENTS FOR - NOW COPYRIGHTED BY IEEE Organization: NEMA
Date: 1980-01-01
Description: These transformers are rated 167 kVA and smaller with high voltages of 34 500 GrdY/19 920 volts and below for operation between one phase and grounded neutral, and low voltages of 240/120 volts. These transformers are generally used for purposes of stepdown from an underground primary cable supply.
ANSI - ANSI C57.12.13 - CONFORMANCE REQUIREMENTS FOR LIQUID-FILLED TRANSFORMERS USED IN UNIT INSTALLATIONS, INCLUDING UNIT SUBSTATIONS Organization: ANSI
Date: 1982-01-01
Description: This standard does not cover the following types of liquid-filled transformers: (1)Overhead-type distribution transformers, including those mounted in surface enclosures (2)Pad-mounted compartmental-type transformers as described and defined in the following standards: American National Standard Requirements for Pad-Mounted Compartmental-Type Self-Cooled Single-Phase Distribution Transformers with High-Voltage Bushings (High-Voltage, 34 500 GrdY/19 920 Volts and Below; Low-Voltage, 240/120; 167 kVA and Smaller), ANSI C57.12.21-1980 American National Standard Requirements for Pad-Mounted Compartmental-Type Self-Cooled Three-Phase Distribution Transformers with High-Voltage Bushing (34 500 GrdY/19 920 Volts and Below; 2500 kVA and Smaller), ANSI C57.12.22-1980 American National Standard Requirements for Pad-Mounted Compartmental-Type Self-Cooled Single-Phase Distribution Transformers with Separable Insulated High-Voltage Connectors, High-Voltage 34 500 GrdY/19 920 Volts and Below; Low-Voltage, 240/120; 167 kVA and Smaller, ANSI C57.12.25-1981 American National Standard Requirements for Pad-Mounted Compartmental-type Self-Cooled Three-Phase Distribution Transformers for Use with Separable Insulated High-Voltage Connectors, High-Voltage, 24 940 GrdY/14 400 Volts and Below; 2500 kVA and Smaller, ANSI C57.12.26-1975 (3) Subsurface or submersible-type transformers as described and defined in the following standards: American National Standard requirements for Underground-Type Single-Phase Distribution Transformers, with Separable Insulated High-Voltage Connectors, High Voltage 24 940 GrdY/14 400 Volts and Below, Low Voltage 240/120, 100 kVA and Smaller, ANSI C57.12.23-1978 American National Standard Requirements for Underground-Type Three-Phase Distribution Transformers, 2500 kVA and Smaller; High Voltage 24 940 GrdY/14 400 Volts and Below; Low Voltage 480 Volts and Below, ANSI C57.12.24-1982 American National Standard Requirements for Secondary Network Tranformers, Subway and Vault Types (Liquid Immersed), ANSI C57.12.40-1982 (4) Rectifier transformers (5) Mobile transformers (6) All transformers for use in ships and other watercraft, railway rolling stock, aircraft, and automotive vehicles other than mobile home and recreational vehicles (7) Transformers used in mines (8) Transformers installed in railways for the generation, transformation, transmission, or distribution of power and used exclusively for operation of rolling stock, or transformers installed in railways and used exclusively for signaling, or communication purposes (9) Instrument transformers (10) Step-voltage regualors and induction voltage regulators (11) Arc furnace transformers (12) Transformers installed with communication equipment under the exclusive control of communication utilities, located outdoors or in building spaces used exclusively for such installations (13) Transformers that are used under the exclusive control of electric utilities for the purpose of communication or metering, or for the generation, control, transformation, transmission, and distribution of electric energy and that are located in buildings used exclusively for such purposes or located outdoors on property owned or leased by the utility, or on public highways, streets, roads, etc, or by established rights on private property
UL 1562 - UL STANDARD FOR SAFETY TRANSFORMERS, DISTRIBUTION, DRY-TYPE - OVER 600 VOLTS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING OCTOBER 22, 2015 Organization: UL
Date: 2013-01-25
Description: These requirements cover single-phase or three-phase, dry-type, distribution transformers, including solid cast and resin encapsulated transformers.
FAA-E-2791 - TRANSFORMER, DISTRIBUTION, PAD-MOUNTED, FOR LOOPED POWER DISTRIBUTION SYSTEMS WITH HIGH VOLTAGE AT 25KV AND BELOW Organization: FAA
Date: 1989-08-28
Description: These transformers are designed for outdoor installation over a concrete vault or similar structure to provide underground power distribution to FAA facilities via a three-phase, four-wire loop distribution system at various distribution voltages (high voltage hot to exceed 25kV, three-phase, line to line). The transformers shall be either single or three-phase, with primary and secondary wiring connections as specified in 1.1 and as indicated in Figures 1 and 2.
IEEE C57.117 - GUIDE FOR REPORTING FAILURE DATA FOR POWER TRANSFORMERS AND SHUNT REACTORS ON ELECTRIC UTILITY POWER SYSTEMS Organization: IEEE
Date: 1986-06-19
Description: Included are the following types and applications of transformers: power transformers autotransformers regulating transformers phase-shifting transformers shunt reactors HVDC converter transformers substation transformers transmission tie transformers unit transformers unit auxiliary transformers grounding transformers For the purpose of abbreviation in this document, the term “transformers(s)” refers to“power transformer(s) and shunt reactor(s).”
NEMA - ANSI C12.11 - FOR INSTRUMENT TRANSFORMERS FOR REVENUE METERING 10KV BIL THROUGH 350 KV BIL (0.6 KV NSV THROUGH 69 KV NSV) Organization: NEMA
Date: 2007-01-01
Description: NEMA Smart Meter Package also establishes performance criteria for thermal demand meters, mechanical demand registers and phase shifting devices used in metering. Test methods for transformer-rated meters and self contained "A" base watt hour meter are included in this package as well as a watt hour safety standard.
NEMA SSL 7A - PHASE-CUT DIMMING FOR SOLID STATE LIGHTING: BASIC COMPATIBILITY Organization: NEMA
Date: 2015-01-01
Description: NOTE—Any requirement for compliance to this standard does not supersede applicable international or local regulation. 1 Through an ANSI/IEC base or a non-ANSI/IEC interface.  
NEMA - C37.121 - SWITCHGEAR - UNIT SUBSTATIONS - REQUIREMENTS - NOW COPYRIGHTED BY IEEE Organization: NEMA
Date: 1989-01-01
Description: A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition (throat) sections.
IEEE C37.121 - GUIDE FOR SWITCHGEAR-UNIT SUBSTATION-REQUIREMENTS Organization: IEEE
Date: 2012-12-05
Description: c) Substations in which the transformer section is described and defined as "pad-mounted" in ANSI C57.12.22 and IEEE Std C57.12.27™ [B16].
CSA C22.2 NO 144.1 - GROUND-FAULT CIRCUIT INTERRUPTERS - SECOND EDITION Organization: CSA
Date: 2016-01-01
Description: These requirements do not cover ground-fault circuit-interrupters intended for use in circuits served by a transformer having windings wholly insulated from each other.
UL 943 - UL STANDARD FOR SAFETY GROUND-FAULT CIRCUIT-INTERRUPTERS - FIFTH EDITION Organization: UL
Date: 2016-05-17
Description: These requirements do not cover ground-fault circuit-interrupters intended for use in circuits served by a transformer having windings wholly insulated from each other.
IEEE 1427 - GUIDE FOR RECOMMENDED ELECTRICAL CLEARANCES AND INSULATION LEVELS IN AIR-INSULATED ELECTRICAL POWER SUBSTATIONS Organization: IEEE
Date: 2006-12-06
Description: This guide focuses on open-air bus assemblies and configurations and excludes apparatus clearances (i.e., bushing clearances for transformers, and breakers). Detailed coverage of apparatus clearances is provided in other applicable guides and standards.
IEEE C57.21 - STANDARD REQUIREMENTS, TERMINOLOGY, AND TEST CODE FOR SHUNT REACTORS RATED OVER 500 KVA Organization: IEEE
Date: 2008-03-27
Description: This standard applies to all oil-immersed or dry-type, single-phase or three-phase, outdoor or indoor shunt reactors rated over 500 kVA.

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