Apparatus and method for regulating the power factor in an electrical distributing-network line

摘要

The specification discloses an apparatus and a method for regulating the power factor in an electrical distributing-network line; according to one embodiment of the invention, the active line power is measured by means of a transducer, the output from which is a continuous voltage proportional to the active power supplied by the line; the reactive power of the line is then measured by means of a second transducer, the output from which is also a continuous voltage proportional to the reactive power supplied by the line; the voltage supplied by the active-power transducer is then divided by voltage dividers in order to obtain two reference voltages L.sub.1, L.sub.2, the values of which indicate the fixed limits for the line power factor; the voltage supplied by the reactive-power transducer is then compared with reference voltages L.sub. 1, L.sub.2 for the purpose of obtaining two logic levels indicating one of the three following operations: one or more capacitors are connected if the power factor is below the limit L. sub.1 and is inductive; one or more capacitors are disconnected if the power factor is above the limit L. sub.2 and is inductive; no action is taken if the power factor is above the limit L.sub.1 and below the limit L.sub.2 and is inductive.