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Aspects of PD measurement in hybrid gaseous insulation at DC voltage

HALLER, R., HAMAR, R., HORNAK, J., TRNKA, P. Aspects of PD measurement in hybrid gaseous insulation at DC voltage. In CMD 2016: International Conference on Condition Monitoring and Diagnosis : (proceedings). IEEE: Piscataway, 2016. s. 932-937. ISBN: 978-1-5090-3398-0
Jazyk publikace: eng
Anglický název: Aspects of PD measurement in hybrid gaseous insulation at DC voltage
Rok vydání: 2016
Místo konání: IEEE
Název zdroje: Piscataway
Autoři: Prof. Ing. Rainer Haller Dr. , Ing. Roman Hamar Ph.D. , Ing. Jaroslav Hornak , Doc. Ing. Pavel Trnka Ph.D. ,
Abstrakt EN: The increased application of HVDC components in electrical energy systems has led to new challenges in diagnostic testing and measurement of electrical insulation. This paper deals with PD measurement on hybrid gaseous insulation at DC testing. Such insulation types are mostly characterized by the presence of insulating (solid) materials which become electrically charged, if an electric field is present within the insulation. For the study of such phenomena, a simple needle-plane electrode set with an insulating sheet was investigated at DC voltage with different polarities and electrical stress durations. It could be shown, that the charging process on the insulating sheet already takes place at test voltages below the measured PD inception voltage level. The charge intensity on that interface and, as a consequence, its impact on the electrical field conditions e.g. the inception field strength, depends both on polarity and applied voltage duration. It is assumed, that any charging process below the (self-sustaining) ionisation level, characterized by the electrical inception field strength, should be caused by natural ionisation processes which take place in the test object. This assumption was supported by different results obtained if the test set was under open- and closed- volume condition. In the same manner, the results obtained were confirmed by electrical field calculations for different charging conditions on the insulating sheet and applied voltage polarity. The results described in the paper lead to the main conclusion that the charging ability of interfaces in hybrid gaseous insulation must be considered if PD measurement at DC voltage should be performed.
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