Open AccessSparkover observation and analysis of the soil under the impulse current
Author(s) -
Wen Xishan,
Feng Zhiqiang,
Lu Hailiang,
Tong Xuefang,
Lan Lei,
Chen Wenguang,
Tan Bo
Publication year - 2016
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2015.0082
Subject(s) - impulse (physics) , electrode , spark (programming language) , mechanics , ground , soil science , spark discharge , materials science , geotechnical engineering , environmental science , electrical engineering , geology , chemistry , engineering , physics , computer science , quantum mechanics , programming language
The spark discharge in the soil is a key factor that affects the impulse characteristics of grounding devices under the lightning current. However, since soil is inhomogeneous medium consisted with humid‐air, ionic liquid, and soil particles, the developing process of the soil sparkover is very complicated. In this study, the polyester‐based sensitive films are used to observe the morphology features of the soil sparkover in the plate electrodes. According to the observed images, the spark discharge in the soil can be divided into partial discharge and arc discharge. The change of instantaneous resistance can be explained by the three 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 method. The distribution of discharge points, developing process, and feature of the soil sparkover are analysed.