• IEEE C57.105-1978

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    IEEE Guide for Application of Transformer Connections in Three-Phase Distribution Systems

    Available format(s):  PDF

    Superseded date:  07-04-2020

    Language(s):  English

    Published date:  20-10-1978

    Publisher:  Institute of Electrical & Electronics Engineers

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    Table of Contents - (Show below) - (Hide below)

    1 Scope
    2 Electrical Connections
      2.1 Primary and Secondary Systems
      2.2 Delta and Y Connections
      2.3 Zigzag-Connected Winding
      2.4 T-T Connections
      2.5 Terminal Markings, Phase Relations, and Paralleling
      2.6 Connection of the Neutral
    3 Magnetic Circuits
      3.1 General Transformer Design
      3.2 3-Phase Transformer Core Configuration
      3.3 Magnetic Circuit Effects on 3-Phase Transformer Behavior
    4 Harmonic Currents and Voltages
      4.1 Exciting Current Harmonics
      4.2 Harmonic Generation
      4.3 Flow on 3-Phase System
      4.4 Telephone Noise
    5 Primary Faults
      5.1 Types and Clearing of Faults
      5.2 Ground Faults
      5.3 Open Conductor Faults
    6 Unbalanced Loads and Secondary Ground Faults
      6.1 Phase-to-Neutral Loads
      6.2 Phase-to-Phase Loads
      6.3 Secondary Faults
    7 Ferroresonance
      7.1 Qualitative Description
      7.2 Transformer Connections Highly Susceptible to Ferroresonance
      7.3 Measures to Minimize the Probability of Ferroresonance with
          Ungrounded Primary Connection
      7.4 Transformer Connections Least Susceptible to Ferroresonance
      7.5 Measures to Minimize the Probability of Ferroresonance with
          Grounded Primary Connections
      7.6 Bibliography
    8 Unsymmetrical Banks and Special Connections
      8.1 T-Connected
      8.2 Circulating Delta Currents
      8.3 Grounded Delta Secondary
      8.4 Open-Delta Secondary
      8.5 Open-Y primary to 4-Wire 208 V Service
      8.6 Effect on Voltage Balance
    9 References and Bibliography
      9.1 General
      9.2 Ferroresonance
      9.3 Special Connections

    Abstract - (Show below) - (Hide below)

    Describes connections in 3-phase distribution systems. Distribution systems are characterized by primary voltages up to and including 34.5 kV, usually have a preponderance of connected transformers with low-voltage windings below 1000 V and furnish electric service to consumers.

    General Product Information - (Show below) - (Hide below)

    Committee Transformers
    Document Type Standard
    Publisher Institute of Electrical & Electronics Engineers
    Status Superseded
    Superseded By

    Standards Referenced By This Book - (Show below) - (Hide below)

    IEEE C57.12.11-1980 IEEE Guide for Installation of Oil-Immersed Transformers (10 MVA and Larger, 69-287 kV Rating)
    IEEE DRAFT C37.95 : D6 99 DRAFT GUIDE FOR PROTECTIVE RELAYING OF UTILITY CONSUMER INTERCONNECTIONS
    IEEE DRAFT C57.12.36 : D10 2006 REQUIREMENTS FOR LIQUID-IMMERSED DISTRIBUTION SUBSTATION TRANSFORMERS
    IEEE C57.12.51-2008 IEEE Standard for Ventilated Dry- Type Power Transformers, 501 kVA and Larger, Three-Phase, with High- Voltage 601 V to 34 500 V; Low- Voltage 208Y/120 V to 4160 V- General Requirements
    ANSI C57.12.52 : 2012 Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
    NEMA TR1 : 2013 TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS
    IEEE C57.12.36-2007 IEEE Standard Requirements for Liquid-Immersed Distribution Substation Transformers
    IEEE 1818-2017 IEEE Guide for the Design of Low-Voltage Auxiliary Systems for Electric Power Substations
    IEEE C57.158-2017 IEEE Guide for the Application of Tertiary and Stabilizing Windings in Power Transformers
    ANSI C57.12.57 : 1987 AMERICAN NATIONAL STANDARD FOR TRANSFORMERS - VENTILATED DRY-TYPE NETWORK TRANSFORMERS 2500 KVA AND BELOW, THREE-PHASE, WITH HIGH-VOLTAGE 34500 VOLTS AND BELOW, LOW-VOLTAGE 216Y/125 AND 480Y/227 VOLTS - REQUIREMENTS
    IEEE C57.12.50 : 1981 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 34500 VOLTS, LOW-VOLTAGE 120 TO 600 VOLTS
    IEEE C57.12.52-2012 IEEE Standard for Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
    IEEE 242 : 2001 PROTECTION AND COORDINATION OF INDUSTRIAL AND COMMERCIAL POWER SYSTEMS
    IEEE C57.12.00-2015 IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers
    IEEE C37.95-2014 IEEE Guide for Protective Relaying of Utility-Consumer Interconnections
    IEEE C57.12.36-2017 IEEE Standard Requirements for Liquid-Immersed Distribution Substation Transformers

    Standards Referencing This Book - (Show below) - (Hide below)

    IEEE C57.91-2011 REDLINE IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators
    IEEE C57.92-1981 IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Up to and Including 100 MVA with 55 C or 65 C Average Winding Rise
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