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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Page 7
... resistance in an electrical circuit . For a homogeneous material where the mean length of 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 ...
... resistance in an electrical circuit . For a homogeneous material where the mean length of 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 ...
Page 8
... resistances in an electrical circuit . Example 1.2 In the magnetic circuit shown in Figure 1.6 , the coil has 100 turns and carries 10 A. The relative permeability of the yoke is 10,000 . The lengths of the segments along the mean ...
... resistances in an electrical circuit . Example 1.2 In the magnetic circuit shown in Figure 1.6 , the coil has 100 turns and carries 10 A. The relative permeability of the yoke is 10,000 . The lengths of the segments along the mean ...
Page 12
... resistance of the coil , W = [ Exid = √ Nxdoxidt = [ N EX dt NX аф dt NX i do J ( 1.8.3 ) Suppose the core has a mean length equal to 1 , and assume the core has a uniform cross - sectional area equal to A. NX i = HX I ( 1.8.4 ) B ( Wb ...
... resistance of the coil , W = [ Exid = √ Nxdoxidt = [ N EX dt NX аф dt NX i do J ( 1.8.3 ) Suppose the core has a mean length equal to 1 , and assume the core has a uniform cross - sectional area equal to A. NX i = HX I ( 1.8.4 ) B ( Wb ...
Page 21
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Page 45
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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