Publications related to Brush discharge

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Partial discharges (PDs) from inhomogeneities, potential sites for future faults, in cable defects, generate high-frequency pulses traveling along electric power networks. Online PD signal detection and location permits proactive maintenance, minimizing the impact of or, ideally, preventing outages, reducing the overall repair time and the customer minutes lost. PD monitoring techniques are commercially available, but their cost-effective implementation requires guarding large parts of a network at once. Th

Stream ecosystems are threatened by chemical contamination and altered vertical connectivity between surface water and groundwater. Vertical hydrological exchanges occur through the porous matrix—comprising coarse surface sediments and the hyporheic zone—which acts as a critical interface for pollutant storage. The Functional Trait (FTR) method, based on oligochaete communities in these two compartments, allows for simultaneous assessment of toxic stress and vertical hydrological exchange dynamics. We appli

Partial discharge (PD) detection is considered one of the most crucial and effective methods for identifying defects in electrical equipment. Consequently, investigating advanced and efficient PD monitoring techniques is essential for the development of gas-insulated equipment (GIE) and the construction of ultra-high-voltage (UHV) networks. This paper first explores the causes and impact characteristics of various defects in GIE based on experimental results and simulation analysis. It then reviews current

Understanding how the path of streamers is influenced by background electric fields is crucial in leader progression models and electrical breakdown models in long gaps. While numerous advanced models of streamers exist, applying them to leader progression models to track streamer movement remains computationally intensive and impractical. In this study, we employ one of the simplest streamer models available in the literature to investigate how streamers are deflected in the presence of background electric

In this work, we present a new device concept for compact high-voltage sensing with high-impedance input port, consisting of an AlGaN/GaN high-electron-mobility channel controlled by trapped carriers generated by a metallic electrode. The high-voltage appl ...

This paper presents a survey of the experiments on runaway electrons (RE) carried out recently in frames of EUROFusion Consortium in different tokamaks: COMPASS, ASDEX-Upgrade, TCV and JET. Massive gas injection (MGI) has been used in different scenarios f ...

At off-design operating operations, cavitating flow is often observed in hydraulic machines. The presence of a cavitation vortex rope may induce draft tube surge and electrical power swings at part load and full load operations. The stability analysis of t ...

The aim of this study is to investigate Lake Geneva’s tributaries using passive samplers in order to establish polychlorinated biphenyl (PCB) fluxes. Silicon rubber sheets are therefore deployed during six weeks at the mouth of eight tributaries and in four waste water treatment plant (WWTP) effluents discharging directly into the lake. Concentrations of absorbed PCBs in the passive samplers allow evaluating the dissolved aqueous concentrations. The total (dissolved and particulate) concentrations in the WW

Recent experiments on the ASDEX Upgrade tokamak aim at improving the physics base for ITER and DEMO to aid the machine design and prepare efficient operation. Type I edge localized mode (ELM) mitigation using resonant magnetic perturbations (RMPs) has been ...

In order to understand the role of electrode materials in electrical discharges with micro gaps (

In the tokamak scrape-off layer (SOL) the magnetic field lines are open, channeling particles and heat onto plasma facing components, and constraining their lifetime. This is a critical issue for ITER and future devices -- safe operation of fusion devices will require a better understanding of the SOL plasma dynamics \cite{Loarte2007}. The steady-state heat load onto the tokamak plasma facing components depends on the SOL width, which results from a balance between plasma injection from the core region, tur

Hydropeaking is a major issue for storage hydropower plants. Hydropeaking can affect negatively the aquatic environment along river streams. For several hydropower plants studies which analyse measures to reduce the surge effect are currently under preparation. A common technical measure is to construct a compensation basin downstream of the powerhouse. The selection of an adequate compensation basin volume is a compromise taking several aspects, such as construction costs, environmental impacts of the comp

The understanding of the role of snow cover runoff in complex terrain for the hydrological cycle is still limited. Water flow in snow is a complex process, because the strong layering of the snow cover causes strong vertical variation in hydraulic properties. It has already been shown that describing melt water flow through a snow cover using Richards equation for 1D unsaturated flow and taking into account the snow stratigraphy, improves snow cover runoff estimations locally. However, the small-scale spati

Flow interactions with a bridge pier and movable river bed result in local scour which can endanger bridge pier foundations. This scour is initiated by the downward flow and amplified by the so-called horseshoe vortex. A new method to reduce scouring around bridge piers has been assessed with preliminary tests. A bubble screen located upstream of the pier may counteract the downward flow and avoid the initiation of scour. Laboratory experiments have been performed in a shallow flume with a physical scale mo

This paper extends previous Corona breakdown predictions for different ionization models in closed structures to open ones such as monopole antennas, as they are frequently encountered in air- and spacecrafts, prone to suffer from this kind of discharge.

In the so-called alpha-heating experiment performed on the JET tokamak during the deuterium-tritium campaign of 1997, the ion temperature was found to be far exceeding (both in absolute value and in its rise time) the level that could have been expected ...

This thesis presents an investigation into arcing and parasitic plasmas in large area plasma enhanced chemical vapour deposition reactors. Two types were investigated: RF breakdown in millimetric gaps in absence of plasma (e.g. dark space shielding), in a ...

Brush discharge

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Application of electromagnetic time reversal for online locating partial discharges in power networks

Applicability of a Functional Trait-Based Methodology in Stream Porous Matrices for Assessing Point-Source Pollution and Vertical Exchange Dynamics

A review of advanced acoustic-chemical-optical partial discharge monitoring techniques for ultra-high-voltage gas-insulated equipment

Deflection of Electric Streamer Channels in an Applied Electric Field

On-Chip High-Voltage Sensors Based on Trap-Assisted 2DEG Channel Control

Comparison of runaway electron generation parameters in small, medium-sized and large tokamaks-A survey of experiments in COMPASS, TCV, ASDEX-Upgrade and JET

Experimental investigation of the mass flow gain factor in a draft tube with cavitation vortex rope

Evaluation des flux de biphényles polychlorés (PCBs) dans les affluents du lac Léman à l’aide de capteurs passifs

Recent ASDEX Upgrade research in support of ITER and DEMO

Temporal characteristics of the pulsed electric discharges in small gaps filled with hydrocarbon oil

Plasma turbulence in the tokamak scrape-off layer

Multiple criteria design analysis of a compensation basin to mitigate hydro-pealink

Snow cover runoff and stream discharge modelling during snow melt in Alpine terrain

Preliminary Study on the Influence of an Air-Bubble Screen on Local Scour around a Bridge Pier

Corona breakdown in open structures: A comparison of several ionization rate models

A phenomenological explanation for the anomalous ion heating observed in the JET alpha-heating experiment of 1997

Arcing in Very Large Area Plasma-Enhanced Chemical Vapour Deposition Reactors