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Mehran University Of Engineering & Technology, SZAB Khairpur Mirs Campus

Mehran University Of Engineering & Technology, SZAB Khairpur Mirs Campus. PARALLEL OPERATION OF SINGLE PHASE TRANSFORMER. ENGR. AHSANULLAH MEMON LECTURER DEPARTMENT OF ELECTRICAL ENGINEERING MUCET KHAIRPUR MIRS. INTRODUCTION

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Mehran University Of Engineering & Technology, SZAB Khairpur Mirs Campus

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  1. Mehran UniversityOf Engineering & Technology, SZAB KhairpurMirs Campus • PARALLEL OPERATION OF SINGLE PHASE TRANSFORMER ENGR. AHSANULLAH MEMONLECTURERDEPARTMENT OF ELECTRICAL ENGINEERING MUCET KHAIRPUR MIRS

  2. INTRODUCTION • The transformers are connected in parallel when load on one of the transformers is more than its capacity. • Two transformers are said to be connected in parallel if the primary windings are connected to supply busbars and secondary windings are connected to load busbars. • The reliability is increased with parallel operation than to have single larger unit. • The cost associated with maintaining the spares is less when two transformers are connected in parallel.

  3. Conditions for Parallel Operation

  4. CONDITION (I)

  5. CONDITION (II)

  6. CONDITION (III)

  7. CONDITION(IV) • If the reactance/resistance ratios of the two transformers are not equal, the power factor of the load supplied by the transformers will not be equal. • In other words, one transformer will be operating with a higher and the other with a lower power factor than that of the load.

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