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 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.

Modification of Cast Epoxy Resin Surfaces During Exposure to Partial Discharges

1994 ◽  
pp. 635-641 ◽  
Author(s):  
Helena Slowikowska ◽  
T. Łas ◽  
J. Slowikowski ◽  
R. J. Van Brunt
Keyword(s):  
Epoxy Resin ◽  
Partial Discharges

Polymer Insulation for Superconductive Application

2017 ◽  
pp. 350-386
Keyword(s):  
Low Temperature ◽  
Epoxy Resin ◽  
Pulse Frequency ◽  
Void Defect ◽  
Electrical Tree ◽  
Important Quality ◽  
Solid Dielectrics ◽  
Number Of Discharges ◽  
Inception Voltage

With the research and development of high temperature superconducting technology, superconducting insulating materials under liquid helium and nitrogen temperature have been gradually taken seriously. Considering the unique operating environment, epoxy resin and PI face the challenge of low temperature. Electrical tree is one of the aging failure phenomena occurring in solid dielectrics. These imperfections could cause the field concentration with the application of high voltage, which results in partial discharges (PD). PD testing is an important quality check for the insulation of HTS cable. This chapter presents a study aimed at clarifying the influence of low temperature, pulse frequency and pulse duration on the electrical tree characteristics in epoxy resin, as well as PD characterization of PI film in LN2. The results show that the number of discharges and the discharge quantity in PI films increase with the increasing of the applied voltage and the defect size. The PD inception voltage decreases when the void defect diameter in PI enlarged and it is higher in LN2 than that at room temperature.

Constant Pressure Fiber Attenuated Total Reflection Probe Used in Infrared Spectrum Analysis

2017 ◽  
Vol 37 (5) ◽  
pp. 0506003 ◽  
Author(s):  
屈若媛 Qu Ruoyuan ◽  
侯立平 Hou Liping ◽  
冯 翔 Feng Xiang ◽  
王志吉 Wang Zhiji ◽  
吴 侃 Wu Kan ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Spectrum Analysis ◽  
Constant Pressure ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Reflection Probe

scholarly journals High-Resolution Infrared Spectroscopy of the v1+ v4Band of14NF3:Reductions of the Rovibrational Hamiltonian

2012 ◽  
Vol 9 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Hamid Najib ◽  
Siham Hmimou ◽  
Hicham Msahal
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Excited State ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Sixth Order ◽  
Degenerate State ◽  
Unitary Equivalence

The high-resolution Fourier transform infrared spectrum of nitrogen trifluoride NF3has been studied in the v1+ v4perpendicular band region around 1523 cm−1. All experimental data have been refined applying various reduction forms of the effective rovibrational Hamiltonian developed for an isolated degenerate state of a symmetric top molecule. The v1= v4= 1 excited state of the14NF3oblate molecule was treated with models taking into account ℓ- andk-type intravibrational resonances. Parameters up to sixth order have been accurately determined and the unitary equivalence of the derived parameter sets in different reductions was demonstrated.

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