Potential Transformer 1 : A transformer used to lower the voltage at a set ratio so that the voltage can be measured by instruments and meters at a safe representative level
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}