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:
Feb. 04, 1997
Filed:
Jun. 21, 1995
Arthur C Westrom, Stone Mountain, GA (US);
James W Larsen, Suwanee, GA (US);
Dipl.-Ing H. Horstmann GmbH, , DE;
Abstract
A fault distance locator for underground cable circuits for calculating more accurately the location of a cable fault includes a pulse generator unit for injecting a series of chirped pulse streams into the faulted cable shortly after the cable fault has been established. The delay times between the reflected pulse signals and the sending pulse signals are obtained by a correlation process which is specially designed to eliminate the effect of noise caused by arcing voltage and thus provide an accurate calculation of the distance to the cable fault. The accuracy is further enhanced by injecting pre-fault pulse signals periodically into the cable prior to the occurrence of the cable fault in order to obtain a reference pulse signal. This pulse signal provides information concerning the speed of propagation of the cable and thus affects the distance calculation to the fault.