Effect of Moving Speed of Charged Metallic Spherical Electrode on Electrostatic Discharge

SUMMARY In this investigation, the nature of the electrostatic discharge (ESD) that occurs when a charged object moves toward a stationary grounded object is experimentally clarified. The spark lengths, discharge currents, and induced voltages in a magnetic probe were measured when a charged metalli...

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Bibliographic Details
Published in:Electrical engineering in Japan 2015-02, Vol.190 (3), p.1-8
Main Author: Tomita, Hajime
Format: Article
Language:English
Subjects:
Capacitors
Charging
Discharge
discharge current
Electrodes
electrostatic discharge
Electrostatic discharges
Induced voltage
Mathematical analysis
moving electrode
spark length
Voltage
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Summary:SUMMARY In this investigation, the nature of the electrostatic discharge (ESD) that occurs when a charged object moves toward a stationary grounded object is experimentally clarified. The spark lengths, discharge currents, and induced voltages in a magnetic probe were measured when a charged metallic spherical electrode connected to a 422 pF capacitor approached a stationary grounded object, which was the current target, for different moving speeds of the charged metallic spherical electrode in a range of 1 mm/s to 100 mm/s. The charge voltages of the capacitor were +6.5 kV and +10 kV. Based on the results, the average gap length shortened with the speed of the spherical electrode. The average peak values of the discharge current and the induced voltage were likely to increase with the speed of the spherical electrode. The average rise times of the discharge current and the induced voltage were likely to drop with the speed of the spherical electrode. The relation between the spark length and the discharge current due to the ESD can be explained qualitatively by using an equation derived from the spark resistance formula proposed by Rompe and Weizel.
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.22497