IEEE C57.105 1978
$39.00
IEEE Guide for Application of Transformer Connections in Three-Phase Distribution Systems
| Published By | Publication Date | Number of Pages |
| IEEE | 1978 | 39 |
New IEEE Standard – Active. Reaffirmed 2008. The characteristics of the various transformer connections and possible operating problems under normal or abnormal conditions are treated for three-phase distribution systems. These 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. All combinations of Delta and Y, grounded and ungrounded, T connected, zigzag, and certain special connections are considered. Only two-winding transformers are included. Phasing procedures and loading practices are not covered.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | Title Page |
| 3 | Introduction Participants |
| 5 | CONTENTS |
| 7 | 1. Scope 2. Electrical Connections 2.1 Primary and Secondary Systems |
| 8 | 2.2 Delta and Y Connections |
| 9 | 2.3 Zigzag-Connected Winding |
| 11 | 2.4 T-T Connections 2.5 Terminal Markings, Phase Relations, and Paralleling |
| 15 | 2.6 Connection of the Neutral 3. Magnetic Circuits 3.1 General Transformer Design |
| 16 | 3.2 3-Phase Transformer Core Configuration |
| 18 | 3.3 Magnetic Circuit Effects on 3-Phase Transformer Behavior |
| 19 | 4. Harmonic Currents and Voltages 4.1 Exciting Current Harmonics 4.2 Harmonic Generation |
| 20 | 4.3 Flow on 3-Phase System |
| 21 | 4.4 Telephone Noise 5. Primary Faults 5.1 Types and Clearing of Faults 5.2 Ground Faults |
| 22 | 5.3 Open Conductor Faults |
| 23 | 6. Unbalanced Loads and Secondary Ground Faults 6.1 Phase-to-Neutral Loads |
| 24 | 6.2 Phase-to-Phase Loads |
| 25 | 6.3 Secondary Faults |
| 26 | 7. Ferroresonance 7.1 Qualitative Description |
| 28 | 7.2 Transformer Connections Highly Susceptible to Ferroresonance |
| 30 | 7.3 Measures to Minimize the Probability of Ferroresonance with Ungrounded Primary Connection |
| 31 | 7.4 Transformer Connections Least Susceptible to Ferroresonance |
| 32 | 7.5 Measures to Minimize the Probability of Ferroresonance with Grounded Primary Connections |
| 33 | 7.6 Bibliography 8. Unsymmetrical Banks and Special Considerations 8.1 T-Connected 8.2 Circulating Delta Currents |
| 34 | 8.3 Grounded Delta Secondary |
| 36 | 8.4 Open-Delta Secondary |
| 37 | 8.5 Open-Y primary to a 4-Wire 208 V Service 8.6 Effect on Voltage Balance 9. References and Bibliography 9.1 General 9.2 Ferroresonance |
| 39 | 9.3 Special Connections |
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