Coupling circuit for centralised multistation control system

摘要

Each phase to which coupling is to be effected has a series circuit with a coupling capacitor (CN) on the mains side, a transformer with a mains and transmission coil (LN,LS) and a tuning capacitor (CA) on the transmission side. The transformer has an additional compensation coil (LK) which forms a compensation circuit (KK) with a compensation capacitor (CK). The series circuit forms a three-stage symmetrical filter and the three windings of the transformer are loosely magnetically coupled with each other. The magnetic coupling between the mains winding and the compensation winding is equal to that between the transmission winding and the compensation winding.