Sparkover observation and analysis of the soil under the impulse current

PROJECT TITLE:

Sparkover observation and analysis of the soil under the impulse current

ABSTRACT:

The spark discharge within the soil is a key factor that affects the impulse characteristics of grounding devices below the lightning current. But, since soil is inhomogeneous medium consisted with humid-air, ionic liquid, and soil particles, the developing method of the soil sparkover is terribly complicated. In this study, the polyester-based sensitive films are used to observe the morphology options of the soil sparkover in the plate electrodes. Per the observed images, the spark discharge within the soil can be divided into partial discharge and arc discharge. The modification of instantaneous resistance will be explained by the 3 stages of soil ionisation/deionisation. Moreover, the distinct images of the sparkover around the rod electrode buried horizontally in the grounding pool are obtained by the proposed technique. The distribution of discharge points, developing process, and have of the soil sparkover are analysed.

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