HV CABLE TRANSMISSION - A STUDY ON TORSIONAL STABILITY

The purpose of this paper is to analyze the torsional stability of a t urbogenerator, in a case in which, with a.c. 400 kV cable transmission lines, it is necessary to provide shunted compensation. The problem i s brought into focus from the physical point of view by means of a sim plified schematic operating presentation. This simplified analysis is then validated by means of a computer program for the dynamic study of the electromechanical system, applied to an example consisting of a t urbine shaft, the alternator, the excitation control system, a step-up transformer, and a cable line with shunt compensation and connected t o a prevalent power node. Both the methods of analysis show that, unli ke the dual case of the series compensation of overhead lines, in this case conditions of torsional instability do not occur.