METHOD FOR TRANSMITTING AND RECEIVING CONTROL INSTRUCTIONS THROUGH WIRES OF THREE-PHASE SUPPLY LINE Russian patent published in 1994 - IPC

FIELD: control devices. SUBSTANCE: method provides possibility to test amplitudes of phase voltages. This results in possibility of phase separation when instructions are generated at transmitting part and when instructions are received in given phase. During generation of instruction at transmitting part, carrier signal is modulated in current when amplitude of half-wave of previous phase voltage is maximal. Voltage increment with respect to amplitude of instantaneous voltage of given phase is stored. EFFECT: increased reliability and increased information content of transmission. 4 dwg