TY  - JOUR
T1  - The Effect of a Fault Neutralizer on the Torsional Vibrations of Turbine-Generator Shafts and Blades
AU - , Jong-Ian Tsai 
JO  - International Journal of Electrical and Power Engineering
VL  - 1
IS  - 5
SP  - 493
EP  - 500
PY  - 2007
DA  - 2001/08/19
SN  - 1990-7958
DO  - ijepe.2007.493.500
UR  - https://makhillpublications.co/view-article.php?doi=ijepe.2007.493.500
KW  - Torsional vibration
KW  -fault neutralizer
KW  -turbine generator
KW  -shaft
KW  -blade
AB  - The operating life of a steam turbine is closely related to the operating conditions of a power system. The three-phase-to-ground fault leads to the most onerous impact on turbine-generator mechanism. However, numerous turbine generators even do not encounter such a fault during their operation life times. Since, the single line-to-ground fault has the largest occurrence probability among power system faults, it may be the main cause of fatigue life loss on turbine-generator mechanism due to power system faults. During single line-to-ground fault, the positive-, negative- and zero-sequence networks are in series. For the purpose of limiting fault current, the fault neutralizer is employed to magnify the zero-sequence impedance. This study analyzes the effect of such a resonant reactance connected between the neutral of the wye side of the transformer and the ground in a single-machine-infinite-bus system. From the simulation results, it is found that the neutralizer functioned with parallel resonance not only depresses the torsional vibrations on turbine mechanisms but also enhances the transient stability due to the successful limitation of the fault current. Besides the stresses on power utilities are reduced.
ER  -