Partial discharges and streamers in liquid dielectrics-the significance of the inception voltage

1993 ◽  
Vol 28 (6) ◽  
pp. 941-946 ◽  
Author(s):  
E.O. Forster
Keyword(s):  
Partial Discharges ◽  
Liquid Dielectrics ◽  
Inception Voltage

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 Partial Discharges in Cavities and their Connection with Dipoles, Space Charges, and Some Phenomena Below Inception Voltage

2020 ◽  
Vol 10 (4) ◽  
pp. 5869-5874
Author(s):  
G. E. Vardakis ◽  
M. Danikas ◽  
A. Nterekas
Keyword(s):  
Charge Distribution ◽  
Partial Discharge ◽  
Electromagnetic Theory ◽  
Partial Discharges ◽  
Charge Dynamics ◽  
Space Charges ◽  
Discharge Activity ◽  
Electric Dipoles ◽  
Inception Voltage

This paper tries to relate Pedersen’s model on partial discharges and work carried out by Bruning and co-workers on the possibility of the existence of charging phenomena below inception voltage, which may eventually cause deterioration of polymeric insulation. Moreover, with the aid of the Electromagnetic theory, some aspects of the Pedersen’s model are tried to be clarified, especially those which are correlated with space charges, electric dipoles, charge distribution, charge dynamics, and partial discharge activity.

scholarly journals Foreign Inclusions, Enclosed Cavities, Partial Discharge Models and Discharge Energy: A Short Review Regarding Solid Dielectrics and Composite Insulating Systems

2019 ◽  
Vol 9 (5) ◽  
pp. 4659-4666 ◽  
Author(s):  
M. Danikas ◽  
S. Morsalin
Keyword(s):  
Partial Discharge ◽  
Short Review ◽  
Partial Discharges ◽  
Discharge Energy ◽  
Insulating Materials ◽  
Discharge Parameters ◽  
Solid Dielectrics ◽  
The Relationship ◽  
Inception Voltage

Partial discharges in cavities are one of the main reasons of breakdown of insulating materials and insulating systems in general. The present paper aims at commenting some aspects of the relation between partial discharges and insulation damage. Some basic models explaining the workings and impacts of discharges in cavities are discussed. Discussions about the possibility of damage in the presence of multiple cavities as well as of the risks of minute discharges and/or charging phenomena below the so-called inception voltage are conducted. It is remarked that the question of the relationship between discharge parameters and insulation damage is still an important one, especially for composite insulating systems.

Partial Discharge Inception Voltage in Liquid Dielectrics and its Definition

2021 ◽  
Author(s):  
Luigi Calcara ◽  
Massimo Pompili ◽  
Martin Baur ◽  
Jens Knauel
Keyword(s):  
Partial Discharge ◽  
Liquid Dielectrics ◽  
Inception Voltage

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 Comparative Tests of Partial Discharges in Nomex® 910 Paper and Cellulose Paper

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 647
Author(s):  
Hubert Moranda ◽  
Hanna Moscicka-Grzesiak ◽  
Piotr Przybylek ◽  
Krzysztof Walczak ◽  
Radoslaw Szewczyk
Keyword(s):  
Moisture Content ◽  
Partial Discharge ◽  
Mineral Oil ◽  
Partial Discharges ◽  
Comparative Tests ◽  
Cellulose Paper ◽  
Pure Cellulose ◽  
Insulation Systems ◽  
Four Levels ◽  
Inception Voltage

The article presents the results of comparative investigations of partial discharges in two insulation systems; aramid-enhanced cellulose paper-mineral oil, and pure cellulose paper-mineral oil. Partial discharges were investigated in a diagonal electric field with vertical and horizontal components. This field is treated as the most dangerous for insulation. The research was carried out on Nomex® 910 paper and cellulose paper samples, each paper being 0.25 mm thick. Samples of the two materials were tested at four levels of moisture. The inception voltage of partial discharges of all samples tested decreased as their moisture content increases. It was also proved that Nomex® 910 has a significantly higher partial discharge inception voltage than the cellulose paper, although this difference decreased with increasing moisture content.

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