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dc.contributor.authorFernando, Sudath Namalen_US
dc.date.accessioned2007-07-12T19:43:02Z
dc.date.available2007-07-12T19:43:02Z
dc.date.issued2001-05-01T00:00:00Zen_US
dc.identifier.urihttp://hdl.handle.net/1993/2712
dc.description.abstractMetal Oxide Surge Arresters (MOSA) degrade in service under the influence of constant working voltage, internal partial discharges, non-uniform voltage distribution, possible moisture ingress and the occurrence of transient or sustained over-voltage; all of the above result in an increased value of resistive leakage current. The degradation of MOSA in service is diagnosed by using the third harmonic content of the resistive portion of the arrester leakage current as an indicator. This thesis investigates errors in the diagnostic indicator due to the hysteresis character of the valve elements, the effect of stray capacitance and voltage harmonics. A method is proposed to assess the discerning ability of the diagnostic indicator due to hysteresis character of the valve elements and voltage harmonics. Effect of stray capacitance on the diagnostic indicator is investigated by carrying out simulations in PSCADTM using a model developed in the present work. The simulation results show that the diagnostic indicator is influenced by hysteresis character of the valve elements, stray capacitance and voltage harmonics. The diagnostic indicator is affected by the location of the aged valve element in the arrester column.en_US
dc.format.extent3151680 bytes
dc.format.extent184 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoengen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleEffect of valve element characteristics, stray capacitance and voltage harmonics on surge arrester diagnosticsen_US
dc.typeinfo:eu-repo/semantics/masterThesis
dc.typemaster thesisen_US
dc.degree.disciplineElectrical and Computer Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US


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