The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1999
Filed:
Aug. 02, 1996
Applicant:
Inventors:
Yasuo Iijima, Takefu, JP;
Masahiro Tsubokawa, Takefu, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 88 ; 324551 ;
Abstract
A voltage value of an impulse voltage repetitively applied on a test-piece coil is increased in accordance with time elapse. A terminal voltage applied on both ends of the test-piece coil is monitored to detect an electric breakdown of the test-piece coil. Upon detecting such a breakdown, application of the impulse voltage is immediately stopped to prevent the test-piece coil from being unnecessarily damaged. Meanwhile, a voltage value of the impulse voltage is measured quantitatively at the time the electric breakdown is detected and the measured data is stored in a memory, so that the memorized data can be used later as a breakdown voltage value.