This paper focuses on the effect of nanoparticle surface modification DC breakdown and space charge behavior under endurance test XLPE/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanocomposites. A titanate (TC) a vinylsilane (VI) coupling agents, both which contain non-polar functional groups, were used as modifiers for SiO nanoparticles. FESEM results clearly show that TC VI agents improved dispersion within XLPE matrix compared...

Dielectric barrier discharge excitated by pulsed power is a promising approach for producing nonthermal plasma at atmospheric pressure, but generators vary widely in performance and should be chosen according to application requirements. In this paper, repetitive unipolar nanosecond-pulse generator constructed using resonant charging one-stage magnetic compression circuits, where IGBT switches are the key units, respectively. The capable of providing pulses with voltage up 30 kV duration 70...

This paper focuses on the effect of nanoparticle surface modification charge transport characteristics in XLPE/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanocomposites. A titanate coupling agent (TC9) and a 3- (Methacryloyloxy)propyltrimethoxysilane (KH570) were used for SiO nanoparticles. It was found that both KH570 TC9 agents improve dispersion compared with unmodified The improvement to be due increased hydrophobicity...

Incorporating inorganic nanoparticles (NPs) into polymer matrices provides a promising solution for suppressing space charge effects that can lead to premature failure of electrical insulation used in high voltage direct current engineering. However, realizing homogeneous NP dispersion is great challenge especially high-molecular-weight polymers. Here, we address this issue crosslinked polyethylene by grafting matrix-compatible brushes onto spherical colloidal SiO2 NPs (10–15 nm diameter)...

Developing advanced carbon nanomaterials with reasonable pore distribution and interconnection matching the charge-storage capacities electrode kinetics between capacitive battery-type are two of biggest challenges in lithium-ion capacitors (LICs). In this work, a sustainable strategy to fabricate N/S dual-doped hierarchical porous nanofibers (N/S-CNF) is developed via electrospinning thiourea treatment, N/S-CNF employed as both capacitor-type cathode anode for LICs. With rational design,...

Power cables operate at high temperatures over long periods of time, and the electrical behavior silicone rubber (SIR) in new types extra-high-voltage prefabricated cable accessories would change as a result thermal aging. In this study, tests were conducted to reveal effects aging (1000 h 60–180°C) on treeing behavior. It was found that with increasing average tree initiation voltage (ATIV) SIR initially increases peak value then decreases, finally becoming stable within 1000 h. Meanwhile,...

Well dispersed aluminium nitride(AlN) nanoparticles were synthesized by two-step ball milling coupled with surface coating. The AlN nanofluids (NFs) prepared dispersing as-prepared into transformer oil. modified NFs is investigated as a new generation of insulating properties have been firstly. In the case our 0.079% <; Φ 0.159% (Φ means volume concentration in oil), positive lightning impulse breakdown voltage and partial discharge inception (PDIV) increased around 50% 20% compared to those...

Dielectric barrier discharge (DBD) is proved to be an effective method for surface treatment of polymers over the past 20 years and now widely used in fields modification. In this paper, polyethylene terephthalate (PET) films improving hydrophilicity using DBD excited by unipolar nanosecond pulses presented. Two typical discharges exhibiting homogeneous filamentary modes are obtained under certain experimental conditions, then, they modify PET films. The microstructure properties film before...

Dielectric barrier discharge (DBD) excitation by unipolar high voltage pulses is a promising approach for producing non-thermal plasma at atmospheric pressure. In this study, magnetic compression solid-state pulsed power generator was used to produce repetitive nanosecond the excitation. The DBD created using two liquid electrodes. electrical characteristics of and current are illustrated under different experimental conditions. nanosecond-pulse order tens amperes. This differs from common...

In this paper, gliding discharges with a point-to-point electrode geometry were produced by repetitively pulsed power supply rise time of ∼100 ns and full-width at half-maximum ∼200 ns. The characteristics such investigated measuring their voltage–current waveforms taking photographs discharge images. Experimental results showed that once the breakdown occurred, nanosecond-pulse went into stable stage all air gaps, behaving in mode repetitive sparks. Under certain conditions, non-stable...

Space charge is a threat to insulation materials and oil-paper gradually degrades in service. The degradation of cellulose affects space formation, accumulation dissipation, the presence performance dielectric. In this paper, effect thermal aging on behaviors other properties including permittivity, conductivity, tensile strength was investigated. Oil-paper samples were aged at hot spot temperature (180°C). During aging, distribution measured regular interval room temperature. And pulse...

In this paper, initiation behaviors of DC electrical tree in silicone rubber were studied under different voltage polarities and temperature gradients (temperature needle ground electrodes ranged from 20 to 120 °C). Electrical probability, shape, length obtained via the statistics. The results show that polarity effects, where positive is easier for trees initiate, appear evidently various situations. As gradient, decreases first then returns a larger value with increasing when electrode...

In this work, positive temperature coefficient (PTC) material, as a functional filler to compensate the negative of DC electrical resistivity epoxy resin, is studied. As rises above Curie temperature, PTC material increases composites when compared neat epoxy. At 110°C, found be 252.6% Dielectric spectroscopy used analyze mechanism on composites. This paper shows that has potential regulate resistivity-temperature characteristic polymeric insulating materials.

The degradation of electrical insulation is mainly attributed to local defects. Although incorporating organic small molecules into dielectric polymers promotes the strength, accurate suppression defect development a long-term and formidable challenge. Here we utilize adaptive charge capture methodology achieve precise suppression, leading 123% increase in initiation voltage trees anthrone/cross-linked polyethylene, significantly outperforming existing polymer composites. A significant...

In this study, the ball milling method was used to produce superfine green tea powder (SGTP). We contents of chlorophyll, caffeine, polyphenols, and total free amino acids as indicators combined analytic hierarchy process (AHP) fuzzy comprehensive evaluation establish an AHP-fuzzy approach applicable SGTP. The production SGTP optimized using response surface methodology (RSM). results showed that three factors grinding time, rotation speed, ball-to-material ratio had significant effects on...