11th International Symposium on High-Voltage Engineering (ISH 99) 1999
DOI: 10.1049/cp:19990673
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Diagnostics of high voltage metal oxide arresters procedure errors

Abstract: A tcchniqnc has been describcd which can determine ac resistive current directly or by obtaining the watt loss of the tcst specimen and dividing by the true rms (trms) value or the applicd voltagc. Thc procednre errors with standard voltage dividers and digital systems have been calculated. Spccial attcntion was paid to thc voltage shift A ncw method for thc dircct resistive current measurement was proposcd. Tlic effect of small amount of harmonics was shown.

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Cited by 3 publications
(2 citation statements)
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“…The flashover voltage of ceramic long rod insulators or cap and pin insulators under a standardized rain test (precipitation 3 mm/min and the conductivity of water 100 µS/cm) is reduced by approximately 20% when compared to the flashover voltage in dry conditions. A much greater decrease in electrical strength occurs with rainwater conductivity greater than 1 mS/cm [6], or when insulators are contaminated and the surface conductivity exceeds 10 µS. In the late 1980s and early 1990s, flashovers were recorded on the light polluted bushing insulators of ultra-high voltage DC substations during heavy rains [7].…”
Section: Introductionmentioning
confidence: 99%
“…The flashover voltage of ceramic long rod insulators or cap and pin insulators under a standardized rain test (precipitation 3 mm/min and the conductivity of water 100 µS/cm) is reduced by approximately 20% when compared to the flashover voltage in dry conditions. A much greater decrease in electrical strength occurs with rainwater conductivity greater than 1 mS/cm [6], or when insulators are contaminated and the surface conductivity exceeds 10 µS. In the late 1980s and early 1990s, flashovers were recorded on the light polluted bushing insulators of ultra-high voltage DC substations during heavy rains [7].…”
Section: Introductionmentioning
confidence: 99%
“…Em [15] propõe-se um novo método para determinação direta da componente resistiva da corrente de fuga para estimar a situação dos para-raios. Apresenta-se a possibilidade de obter a componente resistiva através da relação entre as perdas dos para-raios e o valor RMS da tensão aplicada.…”
Section: Revisão Bibliográficaunclassified