Scott-T Connected 3-Phase Inverters for Telecommunications Applications

A study of patents, publications, and applications indicates the first design and application of a "Scott-T Connected Inverter" was made by Warren Communications in 1972. The first installation of record was a 30-KVA inverter system now installed and operating at the Barkeley Bank in Jamaica. Since 1972, other companies are manufacturing inverters with this topology, including Permace Associates, Solidstate Controls, and HDR Power Systems. A sort through technical publications failed to produce any articles (except patents) which discuss the topology in detail. This paper attempts to cover some of the more important application problems which must be dealt with in order to have a safe, reliable, and satisfactory product. This paper also discusses some achievable specifications and performance limitations of the topology.