Transformer electrical machine for gateiespsus youtube. Constructional features of three phase transformers three phase connection of transformers dd0, dd6, yy0, yy6, dy1, dy11, yd1, yd11, zigzag, scott connection, open delta connection, three phase to six phase connection, oscillating neutral, tertiary winding, three winding transformer, equal and unequal turns ratio, parallel operation, load. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Single phase diode rectifiers, al so in the bridge configuration, require a high transformer va rating for a given dc output power. So, next we are back again, so let us take another example. In this paper simulation of parallel transformer is carried out to find the voltage regulation, losses and efficiency of single phase transformers under different supplies. Mod01 lec04 lecture04equivalent circuits of single. Th is type of rec tifiers is suitable for low power applications. Mod01 lec05 lecture05testing of single phase transformers. Lecture series on basic electrical technology by prof. If you have not studied transformer in your btech course then first go through the nptel lecture mod01 then move to mod02 in order to build problem solving ability. The course introduces electrical machines namely transformers, dc and ac rotating machines, which are, arguably, the most important components of energy and power conversion industry. There are two basic reasons for the use of single phase motors rather than 3 phase motors. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail.