April 2011
Intermediate to advanced
992 pages
28h 25m
English
Content preview from J & P Transformer Book, 13th Edition
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Appendix 2: Geometry of the transformer phasor diagram
The following diagrams and equations apply equally well to single-phase transformers and to the individual phases of polyphase transformers.
Specification data
| V1 | primary terminal voltage |
| V2 | secondary terminal voltage |
| I’2 | load component of total primary current |
| I1 | total primary current |
| I2 | secondary load current |
| n (=N1/N2=E1/E2) | turns ratio |
| cos Ø2 | secondary load power factor |
Test data
| R1 | primary resistance |
| R2 | secondary resistance |
| I’2Z’e | total equivalent impedance voltage drop (referred to the primary side) |
| I2Z“e | total equivalent impedance voltage drop (referred to the secondary side) |
| I0 | primary no-load current |
| I“0 | secondary no-load current |
| Pf | iron loss |
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