A way to fast protract voltage waveform of a three-phase full-controlled bridge circuit

The papers offers a fast, simple and convenient way to protract deflector circuit output voltage wave U\-d of a three phase full controlled bridge and double end voltage wave U\-\{VT\} of a thyristor This way directly uses secondary line voltage wave of a transformer to protract, the key is to use the two subscript letters and its change of the secongary line voltage of a transformer to confirm conductive intervals of a thyristor