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. 30, 1976
Filed:
Sep. 16, 1974
James B Briggs, La Canada, CA (US);
Continental Engineering, Inc., Arcadia, CA (US);
Abstract
A device is disclosed herein for monitoring a power system for the presence of faults thereon which cause leakage currents to ground. The device includes a test impedance and bridge switching means for connecting the test impedance in different combinations to a pair of power lines. A singe test impedance is connected in four different configurations to the power lines in sequence, and this cycle is continuously repeated. Currents are measured for each connection to determine whether or not a leakage or hazard current exists which results from a fault load on one or both power lines. The device includes control means for operating the test impedance switching means, and includes current level detecting means for providing an alarm indication in the event a predetermined hazard current exists.