Sparkover observation and analysis of the soil under the impulse current. Issue 3 (1st May 2016)

• Record Type: Journal Article
• Authors: Wen, Xishan; Feng, Zhiqiang; Lu, Hailiang; Tong, Xuefang; Lan, Lei; Chen, Wenguang; Tan, Bo
• Is Part Of: IET science, measurement & technology. Volume 10:Issue 3(2016)
• Page Start: 228
• Page End: 233
• Publication Date: 2016-05-01
• Subjects: sparks -- soil -- lightning -- polymers -- thin films -- electrodes -- arcs (electric) -- geophysical techniques; impulse current -- spark discharge -- grounding device -- lightning current -- humid‐air -- ionic liquid -- soil particle -- soil sparkover observation -- polyester‐based sensitive film -- plate electrode -- partial discharge -- arc discharge -- ionisation‐deionisation -- rod electrode; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2015.0082
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : 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.