Design of the Cryogenic System for 100 MVA HTS Transformer

Author

Kim, S.R. ; Han, J. ; Kim, W.-S. ; Park, M.J. ; Lee, S.W. ; Choi, K.D.

Author_Institution

CVE Ltd., Gunpo

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

1935

Lastpage

1938

Abstract

A 100 MVA, commercial class high temperature superconducting (HTS) transformer was designed. In this paper the cryogenic system to extract the heat generated at the winding due to the AC loss and the heat penetration through the wall and the current lead and keep the winding temperature under design temperature is presented. The operation temperature is set at 67 K to increase the critical current and reduce the amount of HTS tape usage and the volume. The HTS winding was concentrically arranged to reduce the AC loss. The system consists of main cryostat with the windings and secondary cryostat with cooler, cryopump and the heat exchanger inside. The liquid nitrogen is entering the main cryostat at 65 K and assumed to be leaving at 67 K. The winding temperature distribution is simulated with the anticipated heat load using Fluent. The effect of the liquid nitrogen flow rate, inlet location is investigated and discussed.

Keywords

critical currents; cryogenics; high-temperature superconductors; superconducting transformers; AC loss; Fluent; HTS transformer; apparent power 100 MVA; critical current; cryogenic system; cryopump; cryostat; heat exchanger; heat extraction; heat penetration; high temperature superconducting transformer; winding temperature; AC generators; Critical current; Cryogenics; High temperature superconductors; Nitrogen; Power system faults; Power transformer insulation; Research and development; Superconductivity; Temperature distribution; Concentric arrangement of winding; HTS transformer; fluent; pumped circulation; winding temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899262

Filename

4277508