Abstract
For experimental investigations of short time plasma in spark gaps, as used in surge protective devices, high-speed camera recordings are used frequently. The analysis of these recordings provides further details regarding the plasma state and distribution. These deduced details are used to assist research and development processes. To increase the benefit of high-speed camera recordings an empirical model is presented to improve the picture analysis. In this model the recorded radiation intensity is empirically related to the current density within a spark gap. Therefore a specially adapted model spark gap was developed and tested. In this model spark gap areas with homogenous current densities occur. These current densities are determined in the experimental setup through current measurements with separated electrodes. Additionally, the relative radiation intensity between the electrodes is identified using high-speed camera recordings. An empirical correlation between these two measurement values was found and is discussed. It confirmed that the determined correlation improve the mostly intuitive interpretation of high speed camera recordings in spark gaps.
Highlights
Surge protective devices, SPD class 1, are required within power grids to ensure the normal operation of the electrical installation [1]
To increase the benefit of high-speed camera recordings an empirical model is presented to improve the picture analysis. In this model the recorded radiation intensity is empirically related to the current density within a spark gap
An empirical correlation between these two measurement values was found and is discussed. It confirmed that the determined correlation improve the mostly intuitive interpretation of high speed camera recordings in spark gaps
Summary
SPD class 1, are required within power grids to ensure the normal operation of the electrical installation [1]. Within spark gaps an electric arc forms the bypassing path during the protecting operation [3, 4] During this process the main aspects are as follows: Firstly, SPD’s have to create a highly conductive path to divert the surge current to the equipotential bonding. The conductivity of the plasma has to be reduced by several orders of magnitude after the surge, in order to prevent the subsequent fault current fed by the power network [4] These requirements are opposing each other and pose a challenge to undertake
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