Abstract This work investigates the impact of temperature on partial discharge inception voltage (PDIV) an induction motor turn insulation analogy in dry air. consist a pair contacting aluminum electrodes coated with ≈60 μm to 80 μm-thick layer polymer. Based previously published breakdown prediction model and references found literature, PDIV variance due is assumed be mainly affected by coating’s relative permittivity—a function test frequency—and density ambient To separate investigate...

Abstract The variation of the partial discharge inception voltage (PDIV) wedge-shaped, dielectric-bounded air gaps under concurrent changes pressure (7.5 mbar to 950 mbar) and temperature (23°C 110°C) is investigated in this paper. Two coating materials featuring distinctly different variations their dielectric permittivity with are used. experimentally observed PDIV shown be good agreement a physical parametrization terms general scaling parameter (p/T)*(s/eps_r). simplicity suggested makes...

Fused Deposition Modelling (FDM) is one of the most common methods 3D printing used in many fields industry, especially development departments. Since plastics are fundamental materials for electronics aim this work to examine dielectric properties objects printed from such materials. This work's contribution evaluation dependency on quality and use plastic components electronics.

This article presents an experimental verification of a partial discharge inception voltage (PDIV) model for twisted-pair magnet wires (TPMWs), which parametrizes the PDIV wedge-shaped gas gaps (such as TPMWs) solely in terms its reduced coating thickness—the ratio thickness to relative permittivity. According literature, coating's permittivity and should play significant role determining PDIV. Still, no explicit quantification their concurrent effects is often given, they are frequently...

Switching processes of voltage source converters can emit significant high-frequency distortions frequencies between 5 to 20 kHz. Furthermore, the partly propagate from place their origin into a medium system via capacitive coupling power transformers. The origin, parameters, and propagation process were clarified by numerical simulation 1-MW photovoltaic plant connected distribution grid. determined results provided input data for following accelerated aging test setup. main idea behind...

This work presented an FEM (finite element method) mathematical model that describes the temperature distribution in different parts of a 3D printer based on additive manufacturing process using filament extrusion during its operation. Variation properties also originate from inconsistent choices parameters employed by individual manufacturers. Therefore, calculates changes (and resulting print) FFF (fused fabrication) was deemed useful, as it can estimate otherwise immeasurable (such...

Abstract This paper provides a theoretical and conceptual framework for the determination of static breakdown inception thresholds in quasi-uniform gas gaps bounded by dielectric layers thickness s relative permittivity <?CDATA $\varepsilon_\textrm{r}^{{\prime}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mi>ε</mml:mi> <mml:mrow> <mml:mtext>r</mml:mtext> </mml:mrow> <mml:mi mathvariant="normal">′</mml:mi> </mml:msubsup> </mml:math> . The...

Abstract The partial discharge inception voltage (PDIV) in contacting enameled wire pairs exhibits a marked decrease with increased air humidity. While existing literature mentions several potential mechanisms for this reduction, comprehensive quantitative assessment of the associated effects is lacking. This research paper addresses knowledge gap by providing estimation combined impact water on gas’s ionization yield (effective coefficient) and modification electric field caused absorption...

Abstract The partial discharge inception voltage (PDIV) of low-voltage induction motor turn-turn insulation analogy is investigated for variable relative humidity (RH) the surrounding air (temperature and pressure are kept constant close to their ambient values). Three materials, perfluoralkoxy alkane, sealed unsealed alumina (UA), employed as dielectric coating (insulation) test samples. Each material’s properties change differently with RH—of these, permittivity regarded most crucial, it...

The aim of this work was to evaluate the use FFF (Fused Filament Fabrication) technology in high and medium voltage applications. research is based on previous work, where dependence dielectric strength 3D printed objects printing resolution (the thickness one layer) examined. Four polymer materials designated for were chosen experiments - ABS (acrylonitrile butadiene styrene), PET-G (polyethylene terephthalate glycol modified), ASA (acrilonitrile styren acrylate) PP (polypropylene)....

Abstract Recent developments in power electronic technologies lead to new challenges for insulation systems. This contribution aims clarify the influence of a broad range mixed-frequency (MF) medium-voltage and environmental stress parameters on aging epoxy insulation. For this purpose, test samples are stressed with an AC (50 Hz) or DC voltage, superimposed pulse-width-modulated (PWM) voltage (kHz range). An analysis samples’ health state is carried out after by evaluation potential markers...

Over the last few years, nonstandard voltage stresses have begun to occur in electrical power systems as a consequence of electronics usage. Power semiconductors contribute advanced management and current quality control flow. A mutual interaction between switching pulses, emitted by electronics, passive parameters system produce high-frequency harmonics oscillating impulses. These distortions are superimposed on operating frequency stress insulation system. This additional can accelerate...

Although stereolithography (SLA) is the oldest 3D printing method, only a few works have been published about complex electrical properties of objects printed from unfilled photopolymerizable resins. In this paper, we describe how dielectric constant, loss factor, strength, and volume resistivity are influenced by type resin thickness sample. Two commercial resins were used - acrylate/epoxy "blue" acrylate "orange" resin. The mostly dependent on Thicker blue samples showed highest...

In this work, four instruments are investigated and compared concerning the measurement of partial discharges under highfrequency sinusoidal impulse test voltages in a laboratory environment.The chosen instruments, typically employed for detecting with high dV/dt-ratios, high-frequency current transformer, D-dot probe, detection capacitor connected series to object, photomultiplier.Initially, sensitivity is assessed taking place over single period voltage (1 kHz) during positive, unipolar,...

Abstract A pressure scaling law for the partial discharge inception voltage (PDIV) of wedge-shaped, dielectric-bounded gas gaps is derived and experimentally validated. The investigated prototypical electrode geometry relevance in a number practical applications, such as contacting enameled wires electric motors or transformers. particular interest propulsion aviation systems. results show that PDIV can be accurately parametrized from first principles function parameter <mml:math...

The degradation of plastic materials induced by solar radiation can limit their use in outdoor applications. Therefore, we aimed to find a relationship between the photodegradation 3D printed polylactic acid (PLA) and its electrical thermomechanical properties. In first stage, printing settings were optimized with regard dielectric strength samples. Afterward, sets specimens exposed UV light different spectrum duration. gas-discharge lamps spectral peaks at 254 385 nm used as intense...

In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve performance of electrical systems, they also pollute network with voltage distortions. A mutual interaction between switching pulses, emitted by electronics, and passive parameters system produce high-frequency harmonics oscillating impulses. Although there are quite strict rules define maximum levels such distortions, still theoretically...

The aim of this work was to evaluate the mechanical and thermomechanical properties structures prepared by 3D printing from biodegradable thermoplastic polyester PLA (Polylactic Acid). their manufacture can be a cost-saving ecological alternative current production insulation systems, e.g. condenser bushings or substrates for printed circuit boards. For further practical application, knowledge change thermal in dependence on process parameters is necessary. In research, test samples were...

This article compares the standard electrical method of partial discharge detection with a novel optical based on silicon photomultipliers. A third, complementary, single-loop antenna is added to represent ultra-high frequency commonly used in gas-insulated switchgear/lines. trio air-insulated electrode designs that simulate fundamental fault/discharge types gaseous insulation (protrusion – corona discharge, floating conductive particle, surface discharges) are employed. Phase-resolved...

Electrical insulation materials, especially polymers, may contain miniature internal voids. Insulation systems created from such materials might hence suffer the development of partial discharges in These tend to erode material, which further increases their magnitude and quantity leads a significant enhancement degradation rate. Lately, due high number power electronic components connected grid, repetitive high-frequency distortions occur parts network adjacent these devices. Such cause...

Long-term aging tests of XLPE and 1wt%, 3wt%, 5wt% XLPE-Al<inf>2</inf>O<inf>3</inf> nanocomposites under two different types electric stresses were carried out. The first stress type represented the ideal sinusoidal waveform, whereas second one a waveform polluted by supraharmonics. obtained data treated Weibull statistics per IEC 62539 / IEEE 930 standard to obtain characteristic lifetimes. Subsequently, lifetime &#x2013; points fitted lifelines using inverse power law. results indicated...

Frequent use of power electronics in electrical systems imposes significant impulse and harmonic voltage stresses on various insulation systems. These are stressed by very fast repetitive distortions, which superimposed the frequency voltage. The shape distortions is usually given mutual interaction between switching pulses, emitted electronics, passive parameters distribution grid. lifetime an system influenced partial discharge activity that a consequence long-term or manufacturing...