Abstract
The major cause of failure of DC-GIS is due to presence of foreign
particles causing partial discharges in the insulation structure.
The particle movement in gas insulated system (GIS) radiates electromagnetic
waves and the bandwidth of the signal lies in the range 1-2�GHz.
Increase in applied DC voltage/pressure has not altered the frequency
content of the ultra high frequency (UHF) signal generated due to
partial discharge formed by particle movement. The UHF sensor could
recognize the breakdown of sulfur-hexa-fluoride (SF6) gas under DC
and Lightning impulse voltages and the frequency content of the signal
captured by the UHF sensor lies up to 500�MHz. Mounting UHF sensor
in GIS could allow one to classify internal partial discharges from
breakdown, at the time of testing/during operation. Copyright � 2009
John Wiley & Sons, Ltd.
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