Finite-difference analysis of the atmosphere electric field distribution around a thunderstorm monomer
In this study, two-dimensional finite difference method (2D FDM) is adopted to simulate the electric field distribution around four typical thunderstorm monomers which have different heights, scales and charge distributions. This paper analyses the impact and its range of ground electric field caused by different thunderstorm monomers. This paper also gives a scientific definition and quantitative analysis for the detection range of ground atmospheric electric field meter which is a crucial tactical index. The results in this study have certain significance in theory and practical guidance for thunderstorm monitoring by using networking atmospheric electric field meters.
THE NEW INVERTED ELECTRIC FIELD MILL
The paper introduces a new inverted electric field mill. The electric field mill measures the intensity and polarty of atmospheric electric field to forecast the po tential thunderstorm and electric shock in local area. It can be used safely as a monitor of the warning in places where are likely regions for the occurrence of static electricity and thunderstorm, for example, meteorological conditions for space-flight, aviation, oil, electric power, mine and open-air stadium.
Influence of Neighboring Underground Metal Object on Measurement of Substation Grounding Resistance
The in fluence of underground metal object on the measured results of grounding resista nce is analyzed.If there is a underground metal object in the measuring route,i t would lead to a flat region on the apparent grounding resistance curve.This fl at region would be misidentified as the compensation point of potential electrod e corresponding to the actual grounding resistance of substation,and bring huge error.The neighboring underground metal object has small influence on the value of substation’s grounding resistance.If we wish to utilize this underground me tal object to decrease the grounding resistance of substation,the effective meth od is to connect this metal object with the grounding system.