Characteristics of DC Corona Discharges Caused at the tip of a Needle-shaped Electrode Placed in the Homogeneous Electric Fields

균등전계 중에 놓인 침상 전극의 끝단에서 발생한 직류 코로나방전 특성

Kim, Tae-Ki;Kim, Seung-Min;Lee, Bok-Hee

  • Received : 2015.08.24
  • Accepted : 2015.09.16
  • Published : 2015.11.30


In the measurement of atmospheric static electric field, it is important to know characteristics of corona discharges caused at the tip of test electrode. This paper presents the fundamental data of DC corona discharges that occurred at the tip of a needle-shaped electrode placed in the homogeneous background electric field which simulates the atmospheric static field under thundercloud. The major characteristics of interest for this purpose are the polarity effect of corona discharges and the magnitudes and time intervals of corona current pulses. The experimental set-up consists of the plate-to-plate configuration with a needle-shaped protrusion, DC power supply, and voltage and current measuring devices. As a result of experiments, the polarity dependence of corona pulses is significantly pronounced. The time intervals between successive corona pulses in the negative polarity is much longer than those in the positive polarity. The time intervals for both polarities is drastically decreased as the applied electric field is increased. Also the magnitudes of the positive corona pulses are slightly changed with an increase in applied electric field, but those of the negative corona pulses are linearly increased with increasing the applied electric fields.


Corona Discharge;DC Corona Current Pulse;Polarity Effect;Atmospheric Static Field Time Interval Between Corona Pulse


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