Power Transformers: Principles and ApplicationsComplete with equations, illustrations, and tables, this book covers the basic theory of electric power transformers, its application to transformer designs, and their application in utility and industrial power systems. The author presents the principles of the two-winding transformer and its connection to polyphase systems, the origins of transformer losses, autotransformers, and three-winding transformers and compares different types of transformer coil and coil construction. He describes the effects of short circuits on transformers, the design and maintenance of ancillary equipment, and preventative and predictive maintenance practices for extending transformer life. |
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Results 1-5 of 74
Page 4
... equal to -do / dt , where the direction of E is in the right - hand sense . Figure 1.2 illustrates this principle of magnetic induction . If the magnitude of B is decreasing , then do / dt will be in the downward direction , and E will ...
... equal to -do / dt , where the direction of E is in the right - hand sense . Figure 1.2 illustrates this principle of magnetic induction . If the magnitude of B is decreasing , then do / dt will be in the downward direction , and E will ...
Page 6
... equal to the permeability of the medium μ : μ H = = B H B μ 1.6 THE MAGNETIC CIRCUIT ( 1.5.1 ) ( 1.5.2 ) Since the magnetic core has been introduced , an understanding of the magnetic circuit is necessary to quantify the relationships ...
... equal to the permeability of the medium μ : μ H = = B H B μ 1.6 THE MAGNETIC CIRCUIT ( 1.5.1 ) ( 1.5.2 ) Since the magnetic core has been introduced , an understanding of the magnetic circuit is necessary to quantify the relationships ...
Page 7
... the flux path is I and the cross - sectional area is A , the reluctance is calculated in the MKS system of measurement as follows : l R = A2 / J ΧΑ ( 1.6.2 ) The coil's inductance L is equal to N2 ( u Basic Transformer Theory 7.
... the flux path is I and the cross - sectional area is A , the reluctance is calculated in the MKS system of measurement as follows : l R = A2 / J ΧΑ ( 1.6.2 ) The coil's inductance L is equal to N2 ( u Basic Transformer Theory 7.
Page 8
Principles and Applications John Winders. The coil's inductance L is equal to N2 ( u x A ) / l . Therefore , the coil's induc- tance is inversely proportional to reluctance of the magnetic circuit . For series elements in the magnetic ...
Principles and Applications John Winders. The coil's inductance L is equal to N2 ( u x A ) / l . Therefore , the coil's induc- tance is inversely proportional to reluctance of the magnetic circuit . For series elements in the magnetic ...
Page 9
... equal to the flux density B divided by the permeability : H = B μ In the yoke , H = 0.1252 Wb / m2 = 10,000 Χ με 0.1252 ( 10,000 × 4л × 10-7 ) = 9.963 amp - turns / m In the air gap , μ = μ 。: H = 0.1252 4π Χ 10-7 amp - turn / m amp ...
... equal to the flux density B divided by the permeability : H = B μ In the yoke , H = 0.1252 Wb / m2 = 10,000 Χ με 0.1252 ( 10,000 × 4л × 10-7 ) = 9.963 amp - turns / m In the air gap , μ = μ 。: H = 0.1252 4π Χ 10-7 amp - turn / m amp ...
Contents
1 | |
2 TwoWinding Transformer Connections | 25 |
3 Transformer Impedance and Losses | 69 |
4 Autotransformers and ThreeWinding Transformers | 117 |
5 Short Circuits Inrush Currents and Other Phenomena | 147 |
6 Ancillary Equipment | 189 |
7 Reading and Applying Nameplate Information | 221 |
8 Maintenance Testing Troubleshooting and Reliability | 235 |
Index | 277 |
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Common terms and phrases
A-connected ampere ampere-turns autotransformer B-H curve bushings calculated clip test common winding conductor cooling class copper losses core and coil core form transformer core leg core losses electrical equal equivalent circuit Example exciting current fault current Filtered oil flux density forces harmonic high-voltage IEEE induced voltages insulation kraft paper KVA base KVA rating load current load tap changer magnetic flux magnetizing current nameplate neutral oil level operating output path phase angle phase rotation phase sequence networks phase-to-ground fault phase-to-neutral phase-to-phase power transformers primary and secondary primary voltage primary winding secondary voltage secondary windings sequence currents series impedance series winding shown in Figure single-phase transformers symmetrical components tap changer terminals tertiary winding test report three-phase three-winding transformer trans transformer connection transformer impedance transformer tank turns ratio two-winding transformer unit vector diagram volt voltage rating voltage surge winding temperature Y-Y connection zero phase sequence zero-sequence