METHODS FOR DETECTING THE ROTATION DIRECTION OF THREE-PHASE NETWORKS

摘要

In three-phase applications, the direction of rotation can be determined fro m signal flows in the phase conductors, usually on the basis of indicator diagrams. According to the invention, the individual phases are traced at given time periods and the measuring values or the interpolated approximatio n values or just the signs of the values are evaluated by means of an evaluati on algorithm in order to determine the direction of rotation at at least two points in time. In addition to the basic method, preferably half-wave rectified signal flows from individual phase conductors are evaluated according to an ideal sinusoidal flow. The inventive method can be advantageously used in conjunction with a digital overload relay to determin e the direction of rotation, whereby an available digital signal control devic e and/or signal processing device is used.