A Chart Showing the Relations Between Electrical Quantities on the A-C and D-C Sides of a Converter

A simple and useful chart for showing the relations between electrical quantities on the a-c and d-c sides of a converter has loci of constant direct voltage and current in rectangular co-ordinates representing the active and reactive power of the a-c source. Because the per-unit direct voltage equals the a-c power factor, the loci are radial straight lines; and, because the per-unit direct current equals the per-unit alternating current, the loci are concentric arcs. Other loci may be added to the chart.