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Although existing standards such as IEC62684 and EN 301 489-34 limit the line frequency common mode (CM) voltages at the output of AC/DC converters, the mechanism and characteristics of line frequency CM voltages at the outputs of AC/DC converters are unclear and the technique to reduce it is not well investigated and developed. In this paper, the line frequency CM voltages at the outputs of AC/DC...
We describe the work towards a setup of a low frequency “Josephson impedance bridge” based on programmable Josephson voltage standards. Tests of ac voltage synthesis and dc voltage measurements of the two programmable Josephson standards have been performed including a direct Josephson dc voltage comparison.
For testing of high voltage (h.v.) components under so-called unconventional frequency test conditions as h.v.-test source very often static frequency converters (SFC) were applied. A typical example for that is the testing of power transformers at higher frequency. In the past this test was provided by standardized motor-generator sets, but more and more alternative power sources having SFC-units...
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