Resistance of spark channels

• A study undertaken to measure the resistance ofspark channels in air with two different current waveforms ispresented. In one experiment, the spark was created by a Marxgenerator. In this case, the gap length was maintained at 12.8 cm,and the current flowing through the spark had a peak currentlying in the range of 0.2–2.2 kA. The decay time of the currentwas larger than 100 μs. In the other experiment, the spark wascreated by a current generator. In that experiment, the gap lengthwasmaintained at 1 cm, and the current flowing through the sparkhad peak-current amplitudes in the range of 35–48 kA. The decaytime of the current was larger than 500 μs. The results showthat the resistance of spark channels initially decreases, reaches aminimum value, and then recovers as the current in the spark gapdecreases. The minimum resistance of the spark channel decreaseswith an increasing peak current. The results are compared withvarious theories that attempt to predict the temporal variationof the resistance of spark channels. The comparison shows thatfurther developments in the existing theoretical models are neededin order to reproduce with better accuracy the dynamic behaviorof the channel resistance.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)

Nyckelord

Discharge model

gas discharge

sparks

Teknisk fysik med inriktning mot atmosfäriska urladdningar

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