Estimation of uncertainty regarding soil breakdown parameters

Asimakopoulou, FE; Gonos, IF; Stathopulos, IA

dc.contributor.author	Asimakopoulou, FE	en
dc.contributor.author	Gonos, IF	en
dc.contributor.author	Stathopulos, IA	en
dc.date.accessioned	2014-03-01T01:35:39Z
dc.date.available	2014-03-01T01:35:39Z
dc.date.issued	2011	en
dc.identifier.issn	1751-8822	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21142
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.other	Breakdown voltage	en
dc.subject.other	Critical electric field	en
dc.subject.other	Critical parameter	en
dc.subject.other	Dry and wet	en
dc.subject.other	Fault currents	en
dc.subject.other	Grounding systems	en
dc.subject.other	Impulse current	en
dc.subject.other	Impulse impedance	en
dc.subject.other	Impulse voltage	en
dc.subject.other	Ionisation	en
dc.subject.other	Measuring equipments	en
dc.subject.other	Physical quantities	en
dc.subject.other	Random uncertainties	en
dc.subject.other	Systematic uncertainties	en
dc.subject.other	Electric fields	en
dc.subject.other	Electric grounding	en
dc.subject.other	Estimation	en
dc.subject.other	Ionization	en
dc.subject.other	Soil surveys	en
dc.subject.other	Soils	en
dc.subject.other	Uncertainty analysis	en
dc.title	Estimation of uncertainty regarding soil breakdown parameters	en
heal.type	journalArticle	en
heal.identifier.primary	10.1049/iet-smt.2010.0021	en
heal.identifier.secondary	http://dx.doi.org/10.1049/iet-smt.2010.0021	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The behaviour of a grounding system under fault currents differs from its steady-state behaviour. It has been observed that, when a high impulse current is injected into the grounding system, its impulse impedance drops because of the ionisation phenomenon. The critical parameter for the ionisation phenomenon is the soil critical electric field, which corresponds to the electric field threshold above which the soil ionisation occurs. In bibliography various attempts have been made aiming at its estimation. However, a physical quantity is determined not only by its value, but also by an estimation of the uncertainty. The aim of this work is the analysis of the components of uncertainty and the estimation of the uncertainty regarding the determination of the breakdown voltage associated with the soil critical electric field. Therefore a series of measurements has been conducted by subjecting dry and wet soil samples to impulse voltages, while recording the voltage and the current. Based on these measurements the random uncertainty is calculated while an estimation of the systematic uncertainty is given taking into account the measuring equipment. © 2010 © The Institution of Engineering and Technology.	en
heal.publisher	INST ENGINEERING TECHNOLOGY-IET	en
heal.journalName	IET Science, Measurement and Technology	en
dc.identifier.doi	10.1049/iet-smt.2010.0021	en
dc.identifier.isi	ISI:000284107700003	en
dc.identifier.volume	5	en
dc.identifier.issue	1	en
dc.identifier.spage	14	en
dc.identifier.epage	20	en