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This paper investigates the influence of a resistor on the dielectricbehavior of an air gap. The resistor is connected in series with the air gapand the latter is stressed by impulse voltage. Air gap arrangements ofdifferent geometry with either the rod or the plate grounded are stressed withimpulse voltages of both positive and negative polarity. The resistor isconnected in series with the air gap in the return circuit connecting the gapwith the impulse generator. The method followed involves the investigation ofthe graphs of the charging time concerning the air gaps capacitances, inconnection to the value of the resistor, the geometry of the gap, the effect ofgrounding and the polarity effect. It is determined that the charging time ofthe air gap increases, as the value of the resistor increases. It is alsodetermined that the peak voltage value of the fully charged air gap decreasesas the value of the resistor increases. The results of the mathematical andsimulation analysis are compared with the results of the oscillograms takenfrom experimental work. In addition and consequently to the above results it isconcluded from the experimental work that the in series connection of theresistor in the circuit has significant influence on corona pulses (partialdischarges) occurring in the gap and on the breakdown voltage of the gap. A newmethod of controlling the corona effects and consequently the breakdown voltageof small air gaps stressed by impulse voltage of short duration in connectionto the ground effect and the polarity effect has arisen. Furthermore throughmathematical analysis of the charging graphs obtained from simulation andexperimental oscillograms there was a calculation of the values of thecapacitance of the air gaps in relation to their geometry and the results werecompared to the values calculated with mathematical analysis.

Method of Controlling Corona Effects and Breakdown Voltage of Small Air Gaps Stressed by Impulse Voltages