Poynting Vector in High-Temperature Superconducting Transformers with a Separate Excitation Winding

• Published in: Thermal engineering Vol. 64; no. 13; pp. 1025 - 1031
• Main Authors: Volkov, E. P., Dzhafarov, E. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2017; Springer Nature B.V
• Subjects: Circuit design; Circuits; Coils (windings); Critical current density; Electromagnetic fields; Engineering; Engineering Thermodynamics; Excitation; Heat and Mass Transfer; Magnetic flux; Phase transitions; Superconductivity; Transformers; Winding; leakage magnetic field; electromagnetic energy flux; Poynting vector; mutual magnetic flux; separate excitation winding; primary and secondary power windings; HTSC transformer
• ISSN: 0040-6015; 1555-6301
• DOI: 10.1134/S0040601517130110

The HTSC transformer with a separate winding for excitation of the mutual magnetic flux is considered; the windings of the transformer are performed of first- or second-generation HTSC wires. The article presents the design and the electrical circuit of the transformer, the equations of electromagnetic balance, and the total resistance of the primary and secondary power windings and the separate excitation winding. The transfer of the electromagnetic field energy is considered in a single-phase HTSC transformer with the separate excitation winding using the Poynting vector. The temporal change in the reactive and active components of the Poynting vector and the decrease in the leakage energy flux of the separate excitation winding are shown, which causes an increase in the critical current density of the HTSC power windings, a decrease in the energy losses in the latter, and an increase the in the specific power of the HTSC transformer.