Reactances of synchronous machines

The reactances of synchronous machines is a set of characteristic constants used in the theory of synchronous machines. Technically, these constants specified in units of the electrical reactance (ohms), although they are typically expressed in the per-unit system and thus dimensionless.

Das identifies the following reactances:

• leakage reactance $X_{l}$;
• subtransient reactance $X''_{d}$ with the quadrature-axis counterpart;
• transient reactance $X'_{d}$;
• synchronous reactance $X_{d}$;
• quadrature axis reactances $X_{q}$, $X'_{q}$, $X''_{q}$, counterparts to $X_{d}$, $X'_{d}$, $X''_{d}$;
• negative sequence reactance $X_{2}$;
• zero sequence reactance $X_{0}$;
• Potier reactance $X_{P}$.

Sources

• Park, R. H.; Robertson, B. L. (1928). "The Reactances of Synchronous Machines". Transactions of the American Institute of Electrical Engineers. 47 (2). Institute of Electrical and Electronics Engineers (IEEE): 514–535. doi:10.1109/t-aiee.1928.5055010. ISSN 0096-3860.
• Prentice, B. R. (1937). "Fundamental Concepts of Synchronous Machine Reactances". Transactions of the American Institute of Electrical Engineers. 56 (12). Institute of Electrical and Electronics Engineers (IEEE): 1–21. doi:10.1109/t-aiee.1937.5057505. ISSN 0096-3860.
• Heydt, G.; Kalsi, S.; Kyriakides, E. (2003). "A Short Course on Synchronous Machines and Synchronous Condensers" (PDF). Arizona State University, American Superconductor.
• El-Serafi, A.M.; Abdallah, A.S. (1992). "Saturated synchronous reactances of synchronous machines". IEEE Transactions on Energy Conversion. 7 (3). Institute of Electrical and Electronics Engineers (IEEE): 570–579. doi:10.1109/60.148580. ISSN 0885-8969.
• Das, J. C. (2017). Short-Circuits in AC and DC Systems: ANSI, IEEE, and IEC Standards. CRC Press. ISBN 978-1-4987-4542-0. Retrieved 2023-07-02.