Effect of Electrode Type on Arc Flash Testings for AC Systems

Aytug Font, Alper Kara, and Ozcan Kalenderli


Arc flash testing, arcing energy, breakdown voltage, electrode system


In this study the effect of electrode types on arc flash testing is investigated experimentally. In experiments, three different electrode systems such as plane-plane, rod-plane and sphere-sphere electrodes are used to observe the electrical field effect on arc flash testing. 50 Hz AC voltage is applied to the electrodes in short air gap as 5 mm. In the tests, voltage and current amplitudes during the arc flash are measured for all three electrode systems respectively. The measurement process is repeated for five different gap spacing from 1 mm to 5 mm between the electrodes. Voltage and current characteristics with respect to the electrode type and air gap spacing are obtained graphically by using the data acquired from experiments. The test results are compared with the theoretical results obtained from the formulation given in IEEE 1584 Guide for Performing Arc-Flash Hazard Calculations. In conclusion, both of the experimental and theoretical results seem to satisfy each other.

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