Design of a Single Phase 33 MVA HTS Transformer With OLTC

Author

Lee, S.W. ; Byun, S.B. ; Kim, W.S. ; Lee, J.K. ; Choi, K.D.

Author_Institution

Electr. Eng. & Sci. Res. Inst., Seoul

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

1939

Lastpage

1942

Abstract

HTS transformers which have been developed until now had only fundamental structures. Among the auxiliary functions of conventional transformers, voltage regulating is the most important one. For the voltage regulation, conventional transformers are equipped with on load tap changers (OLTCs). In this paper, we investigate the possibility of the HTS transformer with OLTC. For the case study, we designed a single phase 33 MVA HTS transformer with OLTC. It is one of three individual HTS transformers which composes a 3 phase, 100 MVA transformer. It is expected to substitute for a 3 phase, 60 MVA conventional transformer in Korea. The parameters of an HTS transformer are varied due to the gap length between primary and secondary windings. The length was decided for the transformer to have the impedance of 12%. Its size was limited to the one of the conventional transformer. The characteristics of the HTS transformer were analysed in both case of having OLTC and not.

Keywords

high-temperature superconductors; on load tap changers; superconducting transformers; transformer windings; apparent power 100 MVA; apparent power 33 MVA; apparent power 60 MVA; gap length; high temperature superconducting transformers; impedance; on load tap changers; primary windings; secondary windings; voltage regulation; Buildings; Costing; Helium; High temperature superconductors; Impedance; On load tap changers; Phase transformers; Power transformers; Substations; Voltage control; AC loss; HTS transformer; on load tap changer (OLTC); tertiary winding;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899677

Filename

4277551