Experimental and investigation on parallel operation of three phase transformer for star-delta and delta-delta connections / Mohamad Hisyam Mansor

Parallel operation of transformer involves two or more transformers connected to carry a common load. In order that two or more transformer may operate satisfactorily in parallel it is necessary to fulfill their requirement. The requirement which need to parallel the transformer are the voltage ratio, impedance, phase sequence and also the polarity. The aim of this paper is understudying the requirement for parallel three-phase transformer and the condition when loading with the combination of load. To achieve this, several test has been done including polarity test, phase sequence test, open circuit test, short circuit test and load tests.