Construction of Expert System Prototype for Degradation Diagnosis and Measurement System using Personal Computer

Komori, F.; Hikita, Masayuki; Nishiguchi, Noriaki; Mizutani, Tomoko

doi:10.1541/ieejfms1990.113.5_406

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Under sine wave, the transition of PD pattern from turtlelike to rabbit-like shapes was due to the difference in the PD occurrence probabilities of the first and the other PDs in each cycle, and was explained in terms of the conditions of gas [19] or void surface [20]. Under square voltage, because the rapid voltage rise rate can certainly lead to the larger PDs in the voltage rise time, similar transition to rabbit-like shape can be observed only when more than two pulses can take place in the voltage rise time in each cycle and the first PD tends to be larger than the second one.…”

Section: Discussion On the Transition Of Pd Behaviors With Agingmentioning

confidence: 99%

Effects of discharge area and surface conductivity on partial discharge behavior in voids under square voltages

Okamoto

Suzuoki

2007

IEEE Trans. Dielect. Electr. Insul.

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The transitions of partial discharge (PD) behavior with aging in a void under ac voltages with sine wave and square wave were observed. The transition of the PD magnitude with aging under square wave showed the same tendency as that under sine wave. Moreover, the experimental results also showed some distinctive characteristics of PDs under square voltage (e.g. more than two pulses after the voltage rise time and their transition with aging). These phenomena were explained in terms of the effect of discharge area and the change in surface condition due to PD degradation.

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Section: Discussion On the Transition Of Pd Behaviors With Agingmentioning

confidence: 99%

Effects of discharge area and surface conductivity on partial discharge behavior in voids under square voltages

Okamoto

Suzuoki

2007

IEEE Trans. Dielect. Electr. Insul.

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“…7). Just after the voltage application, the PD pattern was so-called turtle-like pattern and then passing so-called rabbitlike pattern pulses became very small (Table 1) [2,3,4]. This drastic change compared with the case of open void should be caused by the change in gas condition.…”

Section: B Closed Voidsmentioning

confidence: 95%

“…Throughout the voltage application time, the PD pattern remained so-called turtle-like pattern [2,3,4] and the pulse number per cycle and the average charge of each pulse remain constant as shown in Table 1. This implies that the gas content remained unchanged and the PD characteristics are determined mostly by the atmospheric condition.…”

Section: A Open Voidsmentioning

confidence: 99%

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Relation between Concentration of Partial Discharge and Surface Degradation and Breakdown

Suzuoki

Kodani

Komori

et al. 2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Partial discharge (PD) in a void reflects degradation of insulating material and, therefore, is utilized for insulation diagnosis. Although it is well known that PD pattern changes with voltage application, it is not clear how the pattern change is related to material degradation or how it is related to final breakdown. We simultaneously observed PD characteristics and light emission from partial discharge and the results were compared with those of surface observation. Both in an open void where atmospheric condition does not change and in a closed void, PD activity become concentrated in a small spot after certain time of voltage application. This seems to be caused by field concentration due to deposit of degradation products. In an open void, the intensity of each PD pulse is strong but the time to final breakdown is long. This is explained by the fact that the PD spot does not remain in the same place but constantly moves around, leading to smaller local energy input. On the other hand in a closed void, though the intensity of each PD pulse is small, the time before final breakdown is relatively short. This is explained by the experimental result that the PD spot in this case remains in the same place and the local energy input seems large. Finally, by terminating voltage application just before the final breakdown it is confirmed that the breakdown starts at the spot of PD concentration where the deposit exists. As mentioned above, the PD characteristics, void surface degradation and final breakdown are related to each other and this relation is expected to be useful for better insulation diagnosis.

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“…Nonstationary behavior of PD has been observed under a variety of experimental conditions [18,19,26,27,651. By the term nonstationary behavior it is meant that the statistical characteristics of PD such as the pulse-height or phase distributions have a dependence on time.…”

Section: Nonstationary Behaviormentioning

confidence: 99%

Physics and chemistry of partial discharge and corona - recent advances and future challenges

Brunt

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94)

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Construction of Expert System Prototype for Degradation Diagnosis and Measurement System using Personal Computer

Cited by 4 publications

References 3 publications

Effects of discharge area and surface conductivity on partial discharge behavior in voids under square voltages

Effects of discharge area and surface conductivity on partial discharge behavior in voids under square voltages

Relation between Concentration of Partial Discharge and Surface Degradation and Breakdown

Physics and chemistry of partial discharge and corona - recent advances and future challenges

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