Process and device to control at least one compensation coil in a polyphase network

Abstract

Abstract 1. Method of controlling at least one compensation coil (L) in a polyphase network (1, 2, 3), in which the neutral point of the secondary winding (TR2) of a transformer (TR) is earthed via a compensation coil (L), the outputs of the secondary winding (TR2) of the transformer (TR) being connected to the bus bar (W) of the phases (R, S, T) and thereby also to the associated lines (1, 2, 3) of the network, characterised in that for the control of the compensation coil (L) in a correctly functioning network, a predetermined value of the capacitive currents is detected, which corresponds to the sum of the predetermined values of the capacitive currents for the lines (1, 2, 3) of the network, the said predetermined value of the capacitive current which forms the nominal value of the capacitive current is compared numerically with the actual value of the inductive current which is supplied via an angle transmitter (WT) corresponding to the position of the coil (L), the control of the compensation coil (L) is derived from this comparison of the inductive actual value and the capacitive nominal value of the currents, the nominal value of the capacitive current is influenced in a summing amplifier (SV) with an earth connection criterion (EK) and the predetermined value of the capacitive current of each line (1, 2, 3) is set on coding switches, the predetermined value of the capacitive current for at least one line (1, 2, 3) being set at a percentage of the nominal value of the capacitive current for the case of resonance.

Inventors

• 👤 Hans Baumgartner
• 👤 Rolf Schreiber

Bibliographic Details