The potential transformer is an instrument transformer used in power systems to step down primary current voltages and secondary voltages from a higher level to lower secondary potential output voltage level.
Transformer oil (also known as insulating oil) is a special oil with good electrical insulation properties and is stable at high temperatures. Despite the apparent superiority of naphtha-based oil, paraffin oil remains the most commonly used type of oil in transformers worldwide.
A transformer is an electrical device that trades voltage for current in a circuit, while not affecting the total electrical power. This means it takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice versa.