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Fig. 9. Experimental setup for three-phase transformers cores.

Figure 9 Experimental setup for three-phase transformers cores.

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Fig. 1. Treanor’s wound core, extracted from patent U.S. 2 960 756, 1960.
Fig. 1. Treanor’s wound core, extracted from patent U.S. 2 960 756, 1960.
Fig. 3. Conventional wound core transformer (a) 1—phase core type, (b) 1— phase shell type, (c) 3—phase five—legged. Fig. 4. Composite wound cores comprising (a) 1—phase core type, (b) 1— phase shell type, and (c) 3—phase five—legged transformers.
Fig. 3. Conventional wound core transformer (a) 1—phase core type, (b) 1— phase shell type, (c) 3—phase five—legged. Fig. 4. Composite wound cores comprising (a) 1—phase core type, (b) 1— phase shell type, and (c) 3—phase five—legged transformers.
Fig. 2. Composite wound core, extracted from patent U.S. 4 205 288, 1980. Despite the fact that the transformer is the most efficient of all electrical machines, present energy costs are forcing transformer manufacturers and _ utilities to reduce transformer life-cycle costs while maintaining the manufacturing cost within acceptable limits. A number of new transformer cores [21], core joint types [22], and improved amorphous and grain—oriented magnetic steels [23], have been developed recently in order to reduce the manufacturing and operational cost of transformers. Nevertheless, there exists an alternative technique with which it is possible to improve transformer characteristics without the need to revolutionize transformer design or magnetic materials. By using composite magnetic cores constructed with a combination of different grades of grain— oriented magnetic steels the transformer designer can effectively reduce cost and losses.
Fig. 2. Composite wound core, extracted from patent U.S. 4 205 288, 1980. Despite the fact that the transformer is the most efficient of all electrical machines, present energy costs are forcing transformer manufacturers and _ utilities to reduce transformer life-cycle costs while maintaining the manufacturing cost within acceptable limits. A number of new transformer cores [21], core joint types [22], and improved amorphous and grain—oriented magnetic steels [23], have been developed recently in order to reduce the manufacturing and operational cost of transformers. Nevertheless, there exists an alternative technique with which it is possible to improve transformer characteristics without the need to revolutionize transformer design or magnetic materials. By using composite magnetic cores constructed with a combination of different grades of grain— oriented magnetic steels the transformer designer can effectively reduce cost and losses.
Fig. 5. Block diagram of experimental setup for single-phase transformer core measurements.
Fig. 5. Block diagram of experimental setup for single-phase transformer core measurements.
Fig. 8. Block diagram of the experimental setup for three-phase transformer core measurements.
Fig. 8. Block diagram of the experimental setup for three-phase transformer core measurements.
Fig. 6. Experimental setup for single-phase transformer cores. Fig. 7. DAQ setup, current, and active differential voltage probes.
Fig. 6. Experimental setup for single-phase transformer cores. Fig. 7. DAQ setup, current, and active differential voltage probes.
Fig. 12. Comparison of typical three-phase, mixed three-phase, and the respective single-phase, transformer cores specific iron losses.
Fig. 12. Comparison of typical three-phase, mixed three-phase, and the respective single-phase, transformer cores specific iron losses.
Fig. 14. Peak flux density harmonics contents of typical and mixed three— phase transformer cores (a) 1.2 T and (b) 1.6 T. Fig. 13. Three-phase and single-phase specific iron loss increase percentage.
Fig. 14. Peak flux density harmonics contents of typical and mixed three— phase transformer cores (a) 1.2 T and (b) 1.6 T. Fig. 13. Three-phase and single-phase specific iron loss increase percentage.
Fig. 10. Single-phase transformer cores specific iron losses. Fig. 11. Peak flux density distribution across the limb of a wound core.
Fig. 10. Single-phase transformer cores specific iron losses. Fig. 11. Peak flux density distribution across the limb of a wound core.
Fig. 15. Concept and design variables of a two-grade composite wounc core.
Fig. 15. Concept and design variables of a two-grade composite wounc core.
Fig. 16. Regions comprising the FE model of a composite wound core.
Fig. 16. Regions comprising the FE model of a composite wound core.
Fig. 18. Peak flux density distribution along line AB for B = 1.4 T and x =Smm, x, = 10mm.
Fig. 18. Peak flux density distribution along line AB for B = 1.4 T and x =Smm, x, = 10mm.
Fig. 17. Peak flux density nodal plot of a multiple grade lamination wound core(B =1.5T, x, =5mm, x, = 10mm).
Fig. 17. Peak flux density nodal plot of a multiple grade lamination wound core(B =1.5T, x, =5mm, x, = 10mm).
Fig. 19. Peak flux density distribution along line AB for B = 1.5 T and x, =3Smm, x, = 10mm.
Fig. 19. Peak flux density distribution along line AB for B = 1.5 T and x, =3Smm, x, = 10mm.
Related topics:
Finite Element MethodsFinite Element Analysis (Engineering)Finite Elements methodsFinite Element Analysis (FEA)Finite Element Method (FEM)Finite Element ModelingTransmission and DistributionEnergy Efficient Distribution TransformerFinite Element SimulationsOptimal design of power transformer
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