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Friday, July 31, 2020 | History

2 edition of effect of high frequencies on the characteristics of partial discharges in epoxy resin found in the catalog.

effect of high frequencies on the characteristics of partial discharges in epoxy resin

N. J. Roscoe

effect of high frequencies on the characteristics of partial discharges in epoxy resin

by N. J. Roscoe

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  • 8 Currently reading

Published by UMIST in Manchester .
Written in English


Edition Notes

StatementN.J. Roscoe ; supervised byK.J. Cornick.
ContributionsCornick, K. J., Electrical Engineering and Electronics.
ID Numbers
Open LibraryOL19298889M

connected to the studied GIL and compared to conventional ultra-high frequency (UHF) sensors. Partial discharge is primarily used as an indication of equipment degradation, detecting the state of insulation performance of the system as a whole and a method, in this research, of assessing the use of CO. 2. as a direct replacement for SF. 6. Partial discharge characteristics and mechanism in voids at impulse voltages X F Zhao, X Yao, Z F Guo et al. high-voltage electrode moulded with epoxy resin, 3 sheets of polypropylene (PP) laminated paper with high-frequency CT at the voltage increase rate of 1 kVrms/s. Next, PD inception voltage.

Effect of Nanoparticle Volume and Surface Characteristics on the Bulk Properties of Epoxy Nanocomposite Chaudhary, Sunny; Andritsch, Thomas; Vaughan, Alun Dielectric Properties of Epoxy-based Nanocomposite Filled with Fullerene C. This paper contributes to the body of knowledge on the efforts to develop nanodielectrics as the next generation of insulation material. The time-to-failure under electrical tree-induced degradation of vol.% hexagonal BN/Epoxy was found to be 3 times longer than in clean epoxy. For vol.% CNS/Epoxy the time-to-failure was 24 times longer than the clean epoxy.

At present, the most commonly used electrical insulating materials, including cold-curing epoxy resins, are well designed for normal operating conditions. However, new generations of materials should also be capable of withstanding extreme emergency conditions, e.g., in case of fire. For this reason, this study presents the possibilities of an improved cold-curing epoxy resin using halloysite. This paper aims to reveal the high voltage insulation and dielectric properties of epoxy resin samples with various nano-particle of Al2O3 and SiO2. In addition, experimental results were measured for dielectric properties (permittivity and tanδ at 1 kHz and 10 kHz), breakdown voltage and dielectric strength. The dielectric and high voltage insulation properties of nano-composites are.


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Effect of high frequencies on the characteristics of partial discharges in epoxy resin by N. J. Roscoe Download PDF EPUB FB2

Partial Discharges • Once the electric stress in the void exceeds 3 kV/mm (at kPa), electric breakdown (a ^discharge or flow of electrons) will occur in the gas • When the electrons hit the edge of the void, any organic material (polyethylene, epoxy, oil) will be gradually decomposed – aging • A discharge in air also creates ozone.

paper insulation in different stages of partial discharge (PD) development, a PD experimental platform was established and epoxy resin impregnated paper insula-tion samples were prepared. According to the discharge amount, the number of dis-charges and discharge phenomena during the PD process, the PD process is.

Effect of the electrical discharges that causes the surface tracking and partial discharge phenomena on the polymer nanocomposites are the main subjects to be discussed in this paper.

Epoxy nanocomposite samples with a good dispersion of alumina nanoparticles in epoxy matrix were prepared and experiments were performed to measure their partial discharge resistant characteristics. This paper presents the results of a study on the effect of alumina nano-fillers on electrical tree growth in epoxy insulation.

Treeing experiments were conducted at a fixed ac voltage of 15 kV. Epoxy resin samples were processed by one direction and multi-directions polishing methods in this research. The contact angles of the samples, the AC/DC flashover voltage in C 4 F 7 N/CO 2 gas mixtures and the charge dissipation rate of the polished samples were measured.

The results show that the contact angle of the polished epoxy resin sample increases. The need for partial discharge (corona) measurements at very low frequencies is explained and the results of tests on epoxy resin samples are given for the frequency range Hz to 50 Hz.

As no suitable commercial generator was available, a new type of low-frequency low-noise generator has been developed and this is described. The discharge detection system is also explained in the paper.

Partial discharge characteristics and mechanism in voids at impulse voltages high frequency micro-current transducer was set up, based Epoxy resin was used to prevent surface PD near the electrode.

The thickness and diameter of each layer are 1 and 50 mm, respectively. The diameters of the voids tested are 1, 3 and. High temperatures caused by partial discharge results in the decomposition of insulating epoxy resins in electrical equipment.

In this paper, the ReaxFF force field is used to investigate the decomposition process of epoxy resins cured by anhydride and the formation mechanisms of small-molecule gases. Results show that the initiation reaction is the cleavage of an ester bond linked with an.

Partial Discharges of High Frequency Transformer for Space Application in Near Vacuum. Pages Partial Discharge Measurement and Its High Frequency Characteristics in Cast Resin Transformer. Pages Numerical Modelling and Influence of Defects on Space Charges in Epoxy Resin Under HVDC Stresses.

In electrical engineering, partial discharge (PD) is a localized dielectric breakdown (DB) (which does not completely bridge the space between the two conductors) of a small portion of a solid or fluid electrical insulation (EI) system under high voltage (HV) stress.

While a corona discharge (CD) is usually revealed by a relatively steady glow or brush discharge (BD) in air, partial discharges. GIS. Due to high sensitivity and strong anti-interference, ultra-high frequency (UHF) method is extensively utilized to detect GIS partial discharge. In the GIS, SF6 is insulation medium.

Rising edge of PD is very steep, which can trigger electromagnetic wave signal, the frequency band of which is over 3GHz. When high-frequency. They also show that epoxy/enamel composite insulation systems with nanocomposite enameled wires and epoxy resin have longer average lifetimes than conventional systems under ac partial discharges.

Abstract: The need for partial discharge (corona) measurements at very low frequencies is explained, and the results of tests on epoxy resin and polyethylene samples are given for the frequency range Hz to 50 Hz.

As no suitable commercial generator was available, a new type of low-frequency low-noise generator has been developed. The discharge detection system includes a pulse. The correlation between the partial discharge behaviour and the spatial and temporal development of electrical trees grown in an epoxy resin J V Champion, S J Dodd and J M Alison-Recent citations Numerical modeling of partial discharges in a solid dielectric-bounded cavity: A review Cheng Pan et al-Thermodynamic analysis of the.

Abstract: For a long time, classification of partial discharges was performed by eye, by studying discharge patterns at the ellipse of an oscilloscope screen.

The introduction of digital processing techniques allowed automation of the recognition procedure. These procedures are reported and applied to a number of actual HV constructions which suffer from partial discharges. Lulu Liu's 7 research works with 4 citations and reads, including: Partial Discharge Characteristics of an Air Gap Defect in the Epoxy Resin of a Saturable Reactor under an Exponential Decay.

Epoxy-based composite materials are widely used in load-bearing applications, e.g., automotive, aerospace, construction, oil and gas, and marine industries, because of their low cost, good mechanical properties, high specific strength, super adhesiveness as well as good heat and solvent resistance.

For this reason, there is a growing need to. 1. Introduction. The analysis of the types of defects and the degradation modes in different insulation materials of HV electrical systems has shown that the presence of PD is a very common characteristic in all of them [1,2,3].Once PD activity is detected the identification and location of the associated type of defect is very important to evaluate whether the discharges are harmful or not.

2 Partial Discharge Theory Partial discharge theory involves an analysis of materials, electric fields, arcing characteristics, pulse wave propagation and attenuation, sensor spatial sensitivity, frequency response and calibration, noise and data interpretation [3].

In an effort to promote a better understanding of partial discharge (PD), this. What is Partial Discharge? When speaking of partial discharge, the most important standard that every expert will refer to is IEC High-voltage test techniques – Partial discharge standard applies to the measurement of PD in electrical apparatus or systems when testing with AC voltage up to Hz or with DC voltage.High frequency, HF – 3 to 30 MHz; Very high frequency, VHF – 30 to MHz; Ultra high frequency, UHF – to MHz.

In addition to detection of the PD by capacitors, this new document indicates the PD can be measured by high frequency current transformers (HFCTs) and .performance of epoxy resin insulation Thus, the partial discharge is promoted and flashover finally occurs, thereby decreasing the surface electrical strength of EP.

Keywords: HVDC circuit breaker, arc ablation, epoxy resin, surface electrical performance, erated by the secondary winding of a high frequency trans-former was applied to.