Patent ID: 6313614
Filing Date: 2001-11-06
Classification: G05F

Abstract:
A method for controlling a secondary voltage (US) in a transformer device connected to a power network with a given system frequency (f.sub.1), said transformer device comprising a tap-changer (TC) which, in dependence on a supplied control signal (RCS), influences the voltage ratio (RAT) of the transformer device, whereby a voltage variable (u.sub.E) is formed in dependence on the secondary voltage, which voltage variable comprises at least one first control component (u.sub.1, .phi..sub.1) which represents a fundamental frequency component of the secondary voltage, a control quantity (EPV, EEV) is formed in dependence on the voltage variable, and, in dependence on a deviation (DPV, DEV) between the control quantity and a given reference value (PVR, EVR) therefor, the control signal is formed and supplied to the tap-changer, characterized in that the actual fundamental frequency (f.sub.1 *) of the power network is continuously sensed and that the voltage variable is formed in dependence thereon.