Models of grounded mid-tap open-wye and open-delta connected transformers for rigorous analysis of a distribution system

Author

Chen, T.J. ; Chang, J.-D. ; Chang, Y.-L.

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Inst. of Technol., Taipei, Taiwan

Volume

143

Issue

1

fYear

1996

fDate

1/1/1996 12:00:00 AM

Firstpage

82

Lastpage

88

Abstract

The paper presents detailed mathematical models of grounded mid-tap open-wye and open-delta connected transformers for rigorous analysis of a distribution system. The transformers are accurately modelled in phase coordinates, The proposed transformer models consider the copper and core losses, winding connections, the phase angular displacement between primary and secondary windings, and off-nominal tapping. Open-wye and open-delta connections with mid-tap grounded on the secondary side of the transformer banks are quite often used to supply the single-phase lighting load and three-phase power load simultaneously. The detailed models of these transformers are indispensable for analysis of the inherent imbalance of a distribution system

Keywords

distribution networks; earthing; equivalent circuits; lighting; losses; power transformers; transformer windings; copper losses; core losses; distribution system analysis; equivalent circuits; grounded transformers; mid-tap open-delta connected transformers; mid-tap open-wye connected transformers; off-nominal tapping; phase angular displacement; phase coordinates; primary windings; secondary windings; single-phase lighting load; three-phase power load; winding connections;

fLanguage

English

Journal_Title

Generation, Transmission and Distribution, IEE Proceedings-

Publisher

iet

ISSN

1350-2360

Type

jour

DOI

10.1049/ip-gtd:19960168

Filename

488065