Results 271 to 280 of about 80,385 (313)

Experiences in on-site partial discharge measurements and prospects for PD monitoring

2008 International Conference on Condition Monitoring and Diagnosis, 2008
With four case studies (dry-type transformer, power transformer, GIS, generator) this paper describes the principle of synchronous multi-channel PD measurements and its benefits for PD data evaluation. With respect to monitoring the tracing of a charge value as QIEC over the measuring time is not sufficient to assess the PD activity of an HV apparatus.
K. Rethmeier, M. Kruger, A. Kraetge, R. Plath, W. Koltunowicz, A. Obralic, W. Kalkner   +6 more
openaire   +1 more source

Interference analysis and rejection of partial discharge (PD) monitoring signal on-site

Proceedings of 2001 International Symposium on Electrical Insulating Materials (ISEIM 2001). 2001 Asian Conference on Electrical Insulating Diagnosis (ACEID 2001). 33rd Symposium on Electrical and Electronic Insulating Materials and Applications in System, 2002
According to the waveform and spectrum characteristics, various interferences during on-line PD measurement could be divided into three types such as the sinusoidal continuous noises, pulse shaped interference (including the periodical and stochastical) and background noises (similar to the white noise).
null Xiaoning Wang, null Deheng Zhu, null Fuqi Li   +2 more
openaire   +1 more source

Partial discharge. VII. Practical techniques for measuring PD in operating equipment

IEEE Electrical Insulation Magazine, 1991
For pt.VI see ibid., vol.7, no.3, p.9 (1991) Online partial-discharge (PD) tests for monitoring the condition of the solid dielectric insulation in high-voltage equipment are discussed. Sources of external electrical noise are identified, as are attributes of PD and noise that are helpful in drawing distinctions between them. Methods for distinguishing
openaire   +1 more source

Partial discharge current pulse waveform analysis (PD-CPWA) based on PD mechanisms in solid and gas media

Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005)., 2005
This paper introduces a novel technique for partial discharge (PD) measurement and analysis: PD-CPWA (PD current pulse waveform analysis). PD-CPWA focuses on the PD current pulse waveform and its time transition from PD inception to breakdown (BD), which is closely related to PD mechanisms in electrical insulating materials.
N. Hayakawa, Y. Sugimor, H. Okubo
openaire   +1 more source

Partial discharge. XXI. Acoustic emission based PD source location in transformers

IEEE Electrical Insulation Magazine, 1995
Acoustic emission-based partial discharge source location has been applied successfully to power transformers in both factory and field environments, and this method is becoming an established test procedure with a high success rate. With the aid of local utilities and utility laboratories that use acoustic emission apparatus daily, we expect further ...
openaire   +1 more source

PDTools: A toolbox of partial discharge (PD) signal analysis for transformer condition assessment

2017 IEEE Power & Energy Society General Meeting, 2017
Partial discharge (PD) measurement of power transformers provides a means for condition assessment of their insulation systems. To reach an informed assessment on the condition of a transformer's insulation system, it needs to appropriately analyze the measured PD signals. Though abundant methods have been proposed for PD signal analysis, it is still a
Hui Ma, Tapan Saha, Junhyuck Seo, Jeffery Chan, Yi Cui   +4 more
openaire   +1 more source

Model for partial discharges associated with treeing breakdown: I. PDs in tree channels

Journal of Physics D: Applied Physics, 2000
In order to check our physical model for partial discharges (PDs) in a tree channel, the light emission from a PD in an actual tree was observed. The experimental results agreed with the model. By using the model, conditions for the formation of typical phase-amplitude-number (-q-n) pattern of PDs from treeing was discussed.
Kai Wu, Yasuo Suzuoki, Teruyoshi Mizutani, Hengkun Xie   +3 more
openaire   +1 more source

Analysis and rejection of noises from partial discharge (PD) on-site testing environment

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417), 2004
There were many kinds of interference resources in the partial discharge on-site testing environment for a power transformer. According to their spectrums, those could be classified into sinusoidal continuous noises from power carrier communication and radio systems, pulse-shaped wide-band noises including periodical and stochastical pulse-shaped ...
null Xiaoning Wang, null Deheng Zhu, null Fuqi Li, null Shengyou Gao   +3 more
openaire   +1 more source

PD data analysis and evaluation of partial discharge patterns for uniform characterisation

IEE Proceedings - Science, Measurement and Technology, 2004
A modern partial discharge (PD) analyser provides a complete record of PD events obtained during the time of observation. A variety of analysis techniques can be applied to the data to extract characteristic information. An analysis technique that would support instrument-independent characterisation needs to have a method of identifying characteristic
openaire   +1 more source

Long time exposure influence of partial discharge (PD) to coated printed circuit boards

Conference Record of the 1992 IEEE International Symposium on Electrical Insulation, 2003
The authors deal with the behavior of solid insulation under the long-term influence of partial discharges (PDs). As a very recent example for a low-voltage component with solid insulation, namely, the coated printed circuit board was investigated. The measurements necessary to evaluate the long-term influence of PDs were performed by computer-aided ...
H. Buchalla, R. Hund, H. Koch, W. Pfeiffer   +3 more
openaire   +1 more source