Materials Literature
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Gas Insulation System (GIS) is in popular use because of its high reliability and recovery ability. Existing particles in GIS deteriorate the GIS performance due to their higher dielectric constant or conductivity than the gas medium. The objective of study is to investigate characteristic of corona discharge induced…
In this paper, several aspects of the fundamentals of wireless Partial Discharge (PD) measurements are first discussed. Then, the relevance of the problem of voltage synchronization in PD wireless diagnosis is outlined. When portable instruments are used for PD detection, the main issue is the voltage measurement at t…
The existence of the particles has a critical effect on the insulation failures of gas insulated systems. This paper presents the experimental study on the lifting electric field of spherical particles under the different gas pressures in a uniform electric field between two parallel electrodes. The electrode gap was…
The inrush currents related to the connection of generator devices is a typical matter of concern in situation with long distribution lines or/and under low short circuit power values at the PCC. This situation is usual for offshore devices. In this case, it is analyzed the magnetization current of the hydro generator…
In this paper we introduce a monitoring system framework to enhance distribution transformer operation. The system is implemented on top of an embedded Linux board. Its communication conforms to the IEC61850 standard. The functionality of security network, IED configuration, database management and significant perform…
A current objective in the field of grid stabilization is the implementation of resistive superconductive fault current limiters (R-SFCLs). After successful development of R-SFCLs at medium voltage level, the technology shall be applied at high voltage level exceeding 100 kV. In the majority of cases high temperature…
The use of information technology services is increasing and causes a rising energy demand of data centres. In order to cover the requirements linked to this effect and respond to the energetic and environmental goals, fossil fuels need to be replaced by renewable energy sources, and methods to increase the efficiency…
Aims The study was initiated to analyse and characterize application of graphene on to heart valves, and also to evaluate the morphology of graphene after accelerated wear test in saline.Methods Mo...
Partial discharge (PD) results from deterioration to the insulation of high voltage equipment in power grids, such as transformers, switch gears, and cable terminals. PD monitoring is a promising approach that ensures the reliable performance of electrical assets through condition based maintenance. Machine learning t…
A phenomenological model of mobile charge Na+, K+transport in ultrathin films of silicon oxide with a blocking inhomogeneous boundary is developed. Boundary and initial conditionals of the ion currents calculation problem in diffusion - drift approximation taking into account the heterogeneity of the interface within…
The RITS-6 inductive voltage adder (IVA) accelerator (3.5–8.5 MeV) at Sandia National Laboratories produces highpower (TW) focused electron beams (< 3mm diameter) for flash x-ray radiography applications. The Self-Magnetic Pinch (SMP) diode utilizes a hollowed metal cathode to produce a pinched focus onto a high-Z met…
The laser-induced metal deposition technique attracts a great interest not only due to its application in microelectronics and manufacturing of electrochemical sensors but also due to its possible implementation for in situ laser synthesis of nanostructured metal catalysts directly in the reaction mixture. In turn, th…
The moisture assessment of SF6-insulated equipment was never a real concern at Hydro-Quebec. In fact, the molecular sieve installed in the equipment was expected to provide an absolute guarantee of the appropriate moisture level. Since then, major failures caused by high moisture content have changed Hydro-Quebec's ap…
Zinc oxide (ZnO) based materials have attracted much attentions in the past decades for potential utilizations in transparent conducting oxides (TCOs), thin film transistors (TFTs) and light emitting diodes (LEDs) due to its superior properties such as large bandgap (3.37eV), large exciton binding energy (60 meV), hig…
Two-dimensional (2D) materials are a broad family of layered crystals characterized by strong intra-layer bonds, but with weak inter-layer coupling dominated by van der Waals forces. These characteristics allow 2D materials to be either exfoliated or grown with atom-scale thickness. A wide range of 2D materials exist…
The phenomenon of single excessive hydrogen (SEH) is becoming increasingly common in domestic current transformers (CT) in resent years. This phenomenon has led to lots of maintenance work. However, no fault was found in those cases. And the cause of this anomaly has not been clarified. Thus, the aim of this paper is…
Partial discharge (PD) detection is the most effective way of determining the integrity of insulation systems in high voltage electric equipment. Besides its higher sensitivity in comparison with other insulation assessment methods, it can be used for online dielectric analysis and also enables the location of defects…
In this paper the high voltage (220 V) lateral Schottky barrier diodes (SBD) based on AlGaN/GaN heterostructure grown by Metal Organic Chemical Vapor Deposition (MOCVD) on silicon substrate are presented. A low turn-ON voltage (ON, SP) (1.79 mΩ·cm2) and a high reverse breakdown voltage (UBV) (220 V) were simultaneousl…
Wafer level integration of photonic detectors on a silicon substrate is expected to dramatically bring down the cost of detectors. State-of-the-art manufacturing of focal plane arrays (FPA) is based on wafer level processing including mesa delineation, surface passivation, metal evaporation, and indium deposition, fol…
Fuel cells are getting growing interest in industrial areas like backup systems for telecom applications or power source for electric vehicles. Although these systems are characterized by long periods of inactivity, they must be able to start at any instant in the shortest time. However, the membrane of which PEMFCs a…