Phase Shifting Transformers (PST)Oil-insulated, three phase, self-cooled, fully customizable, phase shift transformers (PST). Specifically designed to operate in harsh environments and reduce harmonic currents flowing back into the electrical grid when connected to VSDs (Variable Speed Drives) used in ESP (Electric Submersible Pumps) systems for Oil & Gas solutions. Available for 12-pulse, 18-pulse or 24 pulse rectifier circuits.