Preventing Transformer Saturation in Static Transfer Switches White Paper

This white paper explains the problem of transformer saturation and inrush currents in static transfer switches (STS) used in data center power systems, particularly during emergency transfers between out-of-phase UPS sources. It introduces a patented Real Time Flux Control method that dynamically computes trapped flux and controls SCR firing to eliminate inrush, exceeding CBEMA/ITIC standards regardless of phase difference.