Electromagnetic Force and Mechanical Response of Turbo-Generator End Winding under Electromechanical Faults

Table 3

Comparison of vibration characteristics.

		Normal	Eccentricity	RISC	Composite fault
Max stress and deformation	Coil position	Interphase	Interphase closest the min air gap	Interphase	Interphase closest the min air gap
	Coil at the min air gap	Sn; Dn	Sp > Sn; Dp > Dn	Ss < Sn; Ds < Dn	Ss < Sc < Sp; Ds < Dc < Dp
Vibration	Frequency components	Even harmonics	Even harmonics	Even and weakly odd harmonics	Even and weakly odd harmonics
	Amplitude of coils 60° apart	Equal	Unequal	Equal	Unequal
	2^nd harmonic amplitude	An	Min air gap: Ap > An; Max air gap: Ap < An	As < An	Min air gap: As < Ac < Ap; Max air gap: Ac < min(As, Ap) < An