Negative-sequence losses in solid rotors of turbo-generators and equivalent wave resistance

Negative-sequence losses in solid cylindrical rotors of turbo-generators determined by factory tests performed on a wide range of machine sizes and rotor designs, when treated in a specific manner, yield typical curves. These can be condensed into a characteristic quantity called the rotor wave resistance, which is the real part of the wave impedance, and which assumes definite numerical values for typical damper structures. It can be used for the overall determination of the negative-sequence losses of the rotor, thus facilitating the practical design of a rotor for given duties. But knowledge of the rotor wave resistance also allows the negative-sequence resistance of the machine to be predicted reliably, thereby checking and supplementing the theoretical analysis of synchronous machines.