Results 111 to 120 of about 2,488 (168)

Analysis of Internal Partial Discharge Based on PD Current Waveform

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2008
The analysis of partial discharge (PD) phenomenon to cause long-term degradation of electrical insulation systems is essential to development of electrical insulation technology. The PD pattern on the relation between PD magnitude and the phase of applied voltage is well known one of the electrical insulation diagnosis methods for high voltage ...
Kenji Nanao, Yoshinobu Murakami, Masayuki Nagao   +2 more
openaire   +1 more source

Partial discharge. VIII. PD testing of solid dielectric cable

IEEE Electrical Insulation Magazine, 1991
For pt.VII see ibid., vol.7, no.4, p.9 (1991). The development of solid dielectric cable is discussed and its potential defects are described. Limitations to partial discharge (PD) measurement and testing are discussed, and its use for detecting cavities (also referred to as voids), which are probably the most common defect in solid dielectric cable ...
J.C. Chan, P. Duffy, L.J. Hiivala, J. Wasik   +3 more
openaire   +1 more source

Partial discharges in HV machines; initial considerations for a PD specification

IEE Proceedings A Science, Measurement and Technology, 1993
Partial discharge (PD) specifications exist for all types of electrical equipment except motors and generators. Whereas specifications essentially require that the equipment is discharge-free the stator conductor bar insulation of the motors and generators under consideration is micaceous and has excellent PD resistance.
J.W. Wood, H.G. Sedding, W.K. Hogg, I.J. Kemp, H. Zhu   +4 more
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
Ma, Hui, Saha, Tapan, Seo, Junhyuck, Chan, Jeffery, Cui, Yi   +4 more
openaire   +2 more sources

Joint time-frequency analysis for partial discharge (PD) signal extraction

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM), 2018
The joint time-frequency analysis has been recently applied to PD signal extraction. Its advantage is widely considered to be the capability of analyzing signals in time and frequency domains at multiple scales. This paper presents a study on recent advances in the application of joint time-frequency analysis techniques to extract PD signal from noise.
Ma, Hui, Seo, Junhyuck, Saha, Tapan, Chan, Jeffery   +3 more
openaire   +2 more sources

Partial discharge. III. Cavity-induced PD in solid dielectrics

IEEE Electrical Insulation Magazine, 1990
For pt.II see ibid., vol.6, no.5, p.35 et seq. (1990). The question of how to relate the magnitude of the measured, effective, partial discharge (PD) to the size, shape, and position of the cavity within a solid dielectric system is addressed. The causes of cavities are examined, and a brief review of gas breakdown is given. It is then shown that for a
openaire   +1 more source

Partial discharge (PD) measuring techniques

15th IET International School on High Voltage Engineering and Testing 2008, 2008
The physical background of partial discharges will be explained on simple models. The requirements on the complete partial discharge measuring systems including the calibration and evaluation of the measuring results will be discussed and examples of partial discharge measurements on transformers in the laboratory and on site will be presented. Finally
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Partial discharge. IV. Commercial PD testing

IEEE Electrical Insulation Magazine, 1991
For pt.III see ibid., vol.6, no.6, p.11 et seq. (1990). Commercially available partial discharge (PD) detectors are described, along with their important characteristics. The primary characteristics that detectors have in common and that are used as a basis for classification are the number of inputs used, the bandwidth of the detector, and the method ...
openaire   +1 more source

Calibrating the UHF technique of partial discharge detection using a PD simulator

IEEE Transactions on Dielectrics and Electrical Insulation, 1995
The paper describes a technique for simulating the presence of partial discharges in gas-insulated substation (GIS) equipment. The technique employs a pulse generator to inject current pulses through a suitable protrusion. The current pulses have similar temporal characteristics to those produced by an actual discharge event, with the added advantage ...
A.G. Sellars, S.J. MacGregor, O. Farish
openaire   +1 more source

Partial Discharge Investigation on Power Cable Termination Using PD Acoustic Detection

2020 International Conference on Power, Energy and Innovations (ICPEI), 2020
This paper presents the comparison of partial discharge (PD) interpretation on three different standard test objects and defected power cable terminations among an PD acoustic sensor and conventional IEC60270 capacitive PD detection system. The experiments are conducted as off-line testing which is sourced by isolated high voltage step up transformer ...
Thanapong Suwanasri, Phanupong Fuangpian, Nattapon Panmala, Tanachai Somsak, Cattareeya Suwanasri, Shan Rungsivattagapong, Nattawut Atiwet, Papatsporn Poonpoch   +7 more
openaire   +1 more source