The effect of DC superimposed AC voltage on partial discharges in dielectric bounded cavities

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The effect of DC superimposed AC voltage on partial discharges in dielectric
bounded cavities
Conference Paper · September 2014
DOI: 10.1109/ICHVE.2014.7035408
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Pål Keim Olsen
Norwegian University of Science and Technology
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Frank Mauseth
Norwegian University of Science and Technology
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E. Ildstad
Norwegian University of Science and Technology
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Voltage source converters is used in HVDC stations
in offshore HVDC transmission systems, between the AC and DC
power grid. The AC ripple voltage on the DC side of the HVDC
stations can be in the range of   of the nominal DC voltage,
depending on the size of the lter employed. For offshore HVDC
grids, there is a drive to use polymeric insulated cables on the DC
side. This work investigates how an AC voltage at power frequency
superimposed on DC voltage inuence the partial discharge
magnitude and repetition rate in articial cylindrical cavities in
polymeric insulation. The AC voltage is kept below the AC partial
discharge extinction voltage, and the DC voltage is kept above the
DC partial discharge inception voltage. A resistor-capacitor ABC
circuit model is used for prediction of partial discharge magnitude
and repetition rate under combined AC and DC voltage.
Measurements has been performed on a test object of  layers of
PET lm with mm radius cylindrical cavity in the middle layer.
The results indicate that an AC voltage ripple with an amplitude
lower than the AC partial discharge extinction voltage will increase
the number of large discharges, compared to a DC voltage without
ripple, but the repetition rate will be several orders lower than the
AC voltage frequency.

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