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:
Mar. 16, 1993
Filed:
Jul. 18, 1991
Applicant:
Inventor:
Barry H Ward, Lansdale, PA (US);
Assignee:
James G. Biddle Co., Blue Bell, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324544 ; 324652 ;
Abstract
A testing apparatus for testing electrical insulation, such as cable insulation or electrical rotating machinery ground wall insulation, whereby a cyclically variable inductive reactor is connected in series with an ac power source and the test specimen. The inductance of the reactor is continuously varied such that the magnitude of the inductance is a periodic function of time. As a result the voltage applied to the insulation of the test specimen is in the form of modulated line frequency oscillations passing through resonance.