Measuring Method Using a Measuring Apparatus for Cable Diagnosis and/or Cable Testing
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United States of America Patent
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Issued Date -
Nov 27, 2014
app pub date -
Apr 14, 2014
filing date -
May 22, 2013
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Abstract
A measuring apparatus is connected to a cable to perform testing and diagnosis of the cable. The measuring apparatus includes a voltage source, a resistance, a switch, and an inductance forming a charging circuit, and two anti-parallel thyristors or switched diodes together with the inductance forming a series resonant circuit loop. The apparatus produces a low frequency alternating voltage signal train including a low frequency test signal followed by a low frequency diagnostic signal. The diagnostic signal is a damped decaying signal oscillation in the resonant circuit connected to the test cable. At least one of the signals is bipolar. Both cable testing and cable diagnosis can be performed using the same single measuring apparatus in a single measuring procedure.
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