Measurement of /spl lambda/-i characteristics of asymmetric three-phase transformers and their applications

Modeling of three-phase transformers with three-limb cores is important, such units are very ubiquitous and are asymmetric due to the different lengths of the three limbs of the core. It is, therefore, important to devise a measuring procedure, where the ( – ) characteristics of the three limbs and the zero-sequence ( 0– 0) characteristic due to the tank can be determined. A simulation program is developed so that currents at no-load and symmetric or asymmetric loads can be computed. Measured currents are compared with computed results for 2.3–kVA and 45-kVA units.