Study on the influence law of typical soil parameters based on discharge morphology on critical breakdown field strength

Abstract

The phenomenon of partial discharge of soil that occurs when a lightning current enters the ground through a ground electrode poses a threat to the safety of personnel and equipment. The strength of partial discharge and the formation of soil discharge channels are closely related to the magnitude of the critical breakdown field strength. Therefore, how to accurately obtain the variation law of the critical breakdown field strength of typical soil is the key to realize the safe operation of the grounding device and the cable in the ground and ensure the safety of personnel and equipment. In this paper, a simulation experiment of soil impact characteristics is used to study the variation law of typical soil critical breakdown field strength with soil properties. X-ray transmission imaging technology is used to obtain the morphology of the discharge channel, and its non-intrusive observation method will not disturb the discharge channel itself, making the measurement more accurate. This paper first selects a variety of typical soils to study the influence of soil moisture, salt content, compactness and other factors on the discharge channel morphology, and then studies the calculation method of the critical breakdown field strength of the soil under different discharge channel morphologies. And further explore the reasons for the influence of typical soil media factors on the critical breakdown field strength. The experimental results show that under the same conditions, the relationship between the critical breakdown field strength values of different soils is: Ec of sandy soil

查看原文

分享

微信好友 朋友圈 QQ好友 复制链接

本刊更多论文

基于放电形态的典型土壤参数对临界击穿场强的影响规律研究

雷电电流通过接地电极进入地面时产生的土壤局部放电现象，会对人身和设备的安全造成威胁。局部放电强度和土壤放电通道的形成与临界击穿场强的大小密切相关。因此，如何准确获取典型土体的临界击穿场强变化规律，是实现接地装置和地下电缆安全运行，保证人员和设备安全的关键。本文通过土壤冲击特性模拟试验，研究了典型土壤临界击穿场强随土壤性质的变化规律。采用x射线透射成像技术获取放电通道形貌，其非侵入式观察方式不会干扰放电通道本身，使测量更加准确。本文首先选取多种典型土壤，研究土壤含水量、含盐量、密实度等因素对泄水渠形态的影响，然后研究不同泄水渠形态下土壤临界击穿场强的计算方法。并进一步探讨了典型土介质因素对临界击穿场强的影响原因。试验结果表明，在相同条件下，不同土壤的临界击穿场强值之间的关系为:沙质土Ec <壤土Ec <田园土Ec;正是由于土壤介质的不同因素影响临界击穿场强的原因不同，土壤内部的水分和空气含量以及土壤电导率不同，从而导致临界击穿场强的变化规律不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。