Share

FABRICATION AND PRELIMINARY TEST OF A 72 KILOVOLTAMPERE SUPERCONDUCTING FOUR-WINDING POWER TRANSFORMER. CHARACTERISTICS OF THE QUENCH.

[In Japanese. / En japonais.]

Author(s) : IWAKUMA M.

Type of article: Article

Summary

THE AUTHORS HAVE STUDIED QUENCH PROCESSES IN A 72 KILOVOLT-AMPERE SUPERCONDUCTING FOUR-WINDING POWER TRANSFORMER. QUENCHES IN MAIN WINDINGS WERE INITIATED BY EXCESS CURRENT DUE TO SUDDEN SHORT-CIRCUIT OR A LOCAL HEATING. AN INSTANTANEOUS DECREASE IN THE TRANSPORT CURRENT ORIGINATED FROM APPEARING EXTENSIVE NORMAL REGIONS JUST AFTER THE SHORT-CIRCUIT WAS OBSERVED IN BOTH OF THE PRIMARY AND THE SECONDARY MAIN WINDINGS. THE EQUIVALENT PROPAGATION VELOCITY OF NORMAL ZONES ALONG THE WINDING DURING THE FIRST HALF CYCLE AFTER THE INITIATION OF THE QUENCH WAS ABOUT 2 ORDERS LARGER THAN THE PREDICTIONS. TWO DIMENSIONAL PROPAGATIONS OF THE NORMAL REGION WERE OBSERVED AFTER THE INSTANTANEOUS TRANSITIONS TO THE NORMAL STATE IN THE MAIN WINDINGS. THE AUTHORS DISCUSSED THE MECHANISM OF THESE ABNORMAL TRANSITIONS TO THE NORMAL STATE.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1989-1266
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 23 - n. 6
  • Publication date: 1988
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles in this issue (3)
See the source

Indexing