Capacitance and Dissipation Factor (C&DF) test equipment can sometimes be limited by their power supply when testing highly capacitive objects. An example of power system apparatus that might fall into this category would include large motors, generators or cabling. Test specimens that have a characteristically higher capacitance value will sometimes achieve a maximum output current from the test equipment at less than the desired test voltage. By appropriately positioning a resonating inductor that is adjusted to resonate with the capacitance of the test object, the range of charging current from the test equipment can effectively be extended to accommodate testing of more capacitive test objects.
One of the popular resonating inductors on the market is the Doble Type C 10kV Resonating Inductor. It is designed to be used together with a tester like the Doble M4000 M4100 Power Factor Insulation Analyzer in characterizing and trending the condition of electrical insulation. The Type C is positioned in the test circuit such that signals passing through the inductor are not included in the measurement and only the parameters of the item under test are measured. The resonator has an adjustable air gap for tuning in order to increase the charging current of the Doble M4000 M4100. It has a durable and compact metal enclosure to withstand the harsh conditions of field diagnostics.
Related electrical test equipment available for rent from Protec:
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Editor’s Note: This post was originally published July, 2011 and has been updated freshness, accuracy and comprehensiveness.