ZnOSurgeArresters Diagnosis UsingMicrocontroller
A. Lira, E. C. T. de Macedo, Raimundo C. S. Freire, Benedito Antônio Luciano · 2007
Surgearresters areequipments usedforthepower electrical systems protection. Theylimit thevoltage level during the occurrence ofswitching andatmospheric surges. A surge arrester failure cancause theequipments insulation breakdown orfiashover, oreventhesurgearrester explosion. Toavoidthis problem, the maintenance ofthese equipments ismadebymeansofregular monitoring. Measurement oftheresistive leakage current and analysis ofitsharmonic components isoneofthemostused techniques toevaluate thedegradation level ofmetaloxide surge arresters. Inthis paperispresented anewmeasurement technique fortheresistive component ofleakage current basedon the orthogonal position between thiscomponent andthecapacitive component. Thetechnique isaccomplished bymeansofinductive current sensors basedon nanocrystalline alloys anda PIC microcontroller toprovide themeasurement ofthefirst, third and fifth harmonic components oftheresistive leakage current inthe arrester.