Apparatus for VLF-voltage testing of cables
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United States of America Patent
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Mar 3, 2015
Grant Date -
May 2, 2013
app pub date -
Oct 29, 2012
filing date -
Oct 27, 2011
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Abstract
An apparatus for testing a cable or other capacitive load object with a VLF alternating cosine square, rectangular or trapezoidal test voltage, includes one or two DC voltage sources and a switching arrangement controlled by a measuring and control unit, to produce the test voltage with alternating switched polarity. The apparatus further includes a choke coil serving as an energy store, which is controlled by a switching element to be activated if the voltage/time slope arising during the switch-over after a respective half-wave of the test voltage falls below a defined threshold value.
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