| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a direct current measuring device capable of accurately detecting a direct current component even if an alternating current component is admixed to a measured electric path. SOLUTION: In the detecting device, tertiary coils of two current transformers having supersaturated iron cores are excited to be in a saturated state in the mutually reverse direction by an alternating current excitation power source, a peak voltage to which the output voltages of second coils of the two current transformers are added, is measured while sectioning the measuring period and a direct current flowing in the primary coils of the two current transformers is detected from the difference of the absolute values. In the case where the direct current measured is varied and outputted at every measuring period, the frequency of the excitation power source of the current transformer having the supersaturated iron core is changed to other frequencies.</p> |
