scholarly journals Detection and Recording of Partial Discharges Below the Inception Voltage with a Point-Plane Electrode Arrangement in Air: Experimental Data and Definitions

2010 ◽  
Vol 61 (3) ◽  
pp. 177-182 ◽  
Author(s):  
Michael Danikas
Keyword(s):  
Experimental Data ◽  
Current Flow ◽  
Dielectric Materials ◽  
Partial Discharges ◽  
Small Current ◽  
Air Gaps ◽  
Plane Electrode ◽  
Electrode Arrangement ◽  
Pulse Type ◽  
Inception Voltage

Detection and Recording of Partial Discharges Below the Inception Voltage with a Point-Plane Electrode Arrangement in Air: Experimental Data and DefinitionsThe problem of insulation damage from partial discharges below the inception voltage has not yet attracted much attention. Indications of possible damage exist from previous research. In this paper, the possibility of existence of such phenomena is investigated with small air gaps and point-plane electrode arrangements. It is shown that random discharges below inception voltage may exist. Such discharges are registered and their waveforms are discussed. Experimental evidence is offered that discharges change from the pulse-type to a pulseless-type as the air gap becomes larger. Phenomena affecting in some way the insulating systems below inception may help us to better understand the mechanism of small current flow at relatively low voltages and may contribute to a better formulation of dielectric materials. Furthermore, besides the experimental results, the problem of definitions regarding these phenomena is discussed and commented upon.

scholarly journals Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

2011 ◽  
Vol 62 (5) ◽  
pp. 292-296 ◽  
Author(s):  
Michael Danikas ◽  
Xu Zhao ◽  
Yong-hong Cheng
Keyword(s):  
Experimental Data ◽  
Infrared Spectrum ◽  
Epoxy Resin ◽  
Spectrum Analysis ◽  
Main Idea ◽  
Middle Layer ◽  
Partial Discharges ◽  
Inception Voltage

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage In this paper, some results are presented on experiments concerning partial discharges (PD) behavior of epoxy resin samples. The main idea is to see whether a sample with PD at its inception voltage, still presents some tendency to charging effects below inception. An effort is being made to relate the present work with previous publications on the same main idea. The experiment arrangement is three layers of epoxy resin with a void in middle layer. Different level voltages under inception voltage are applied to the arrangement and different PD waves are registered under different level voltages. To make sure that the tendency to charging effects below inception, infrared spectrum analysis is also conducted and the result is content to clarify our objective.

scholarly journals Detection and recording of partial discharges below the so-called inception voltage

2004 ◽  
Vol 17 (1) ◽  
pp. 99-110 ◽  
Author(s):  
Michael Danikas ◽  
Frixos Prionistis
Keyword(s):  
Partial Discharges ◽  
Air Gaps ◽  
Inception Voltage

The problem of insulation damage from partial discharges below the so-called inception voltage has not attracted much attention from the insulation community. Indications of possible damage exist from previous research. In the present paper, the possibility of existence of such phenomena is investigated with small air gaps and non-uniform electrode arrangements. It is shown that random discharges below inception voltage exist, which on occasions can be quite numerous. Such discharges are registered and their implications are discussed.

scholarly journals Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1392 ◽  
Author(s):  
Michal Kunicki
Keyword(s):  
Glass Ceramic ◽  
High Frequency ◽  
Dielectric Materials ◽  
Mineral Oil ◽  
Partial Discharges ◽  
New Mineral ◽  
Relative Level ◽  
Solid Dielectrics ◽  
Inception Voltage

The paper presents the results of the analysis on the variability of the ultra-high frequency (UHF) signals generated by partial discharges (PD) under the long-term AC voltage. Surface PD (SD) are generated by model PD source (PDS) immersed in brand new mineral oil. Three scenarios are compared and investigated, where different solid dielectrics are applied: pressboard paper (PBP), polytetrafluoroethylene (PTFE) and glass-ceramic (GLS). The PDS is powered continuously by the AC voltage with its relative level of 1.3 of the inception voltage (Ui) within 168 h. UHF signals generated by the continuously occurred SD within 168 h are registered. Various indicators describing the variability of the UHF signals emitted by SD are assigned and analyzed in order to discover if there are any relevant trends presented. Furthermore, some long-term characteristics of the UHF signals emitted by the applied PDS are also announced. As a result, some relevant trends are discovered and related to the properties of the applied dielectric materials, thus the variability of the UHF signals emitted by SD is confirmed. The highest variability of the UHF signals is associated with PBP and the first 48 h after PD inception. Moreover achieved results may be potentially applied for modeling of the PD variability in time, which may be useful for works that concern the development of the UHF method.

scholarly journals Jonscher indices for dielectric materials

2019 ◽  
Vol 09 (06) ◽  
pp. 1950046
Author(s):  
C. L. Wang
Keyword(s):  
Experimental Data ◽  
Asymptotic Behavior ◽  
Dielectric Relaxation ◽  
Time Domain ◽  
Dielectric Response ◽  
Relaxation Function ◽  
Dielectric Materials ◽  
Dielectric Response Function ◽  
Barium Stannate ◽  
Two Parameters

Two parameters are proposed as Jonscher indices, named after A. K. Jonscher for his pioneering contribution to the universal dielectric relaxation law. Time domain universal dielectric relaxation law is then obtained from the asymptotic behavior of dielectric response function and relaxation function by replacing parameters in Mittag–Leffler functions with Jonscher indices. Relaxation types can be easily determined from experimental data of discharge current in barium stannate titanate after their Jonscher indices are determined.

Decomposition characteristics of SF6 under partial discharges with point-to-plane electrode defect

2013 ◽  
Vol 20 (5) ◽  
pp. 1727-1736 ◽  
Author(s):  
Ding Weidong ◽  
Zhou Wenwu ◽  
Ren Xiang ◽  
Li Guojun ◽  
Fan Chuan ◽  
...  
Keyword(s):  
Partial Discharges ◽  
Plane Electrode
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