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The study of production, transfer and accumulation of space charge in silicon rubber (SIR) under direct current (DC) is significant for the research of new high voltage (HV) DC cable accessories and the accessories' stable operation. In this paper, based on SIR materials used for cable accessories and the actual low working stress, the accumulation of space charges in SIR was measured under low DC...
In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed...
It is well known that the modification of insulator surface electric field contributes significantly to the surface flashover in vacuum. For the purpose of studying the surface electric field, an on-line measurement system based on Kerr electro-optical effect is developed. And the preliminary experiments are performed, in which a modified surface field is observed when insulator is being stressed...
We demonstrate an EO polymer based traveling-wave MMI-fed directional-coupler modulator. High-speed and linear operation is demonstrated with bandwidth-length product of 125GHz·cm, the 3-dB electrical bandwidth of 10GHz, and the SFDR of 110±3dB/Hz2/3.
A modified electrospinning setup with parallel electrode and heater plate was presented to fabricate piezoelectric nanofibrous membrane directly. Thanks to the strong electric field strength, high stretch ratio and high environmental temperature during the electrospinning process, α-phase poly (vinylidene fluoride) (PVDF) would be transformed to β-phase well and have excellent piezoelectric performance...
This paper investigated the motion of a metallic cylinder particle of mm size under uniform AC field in three transformer liquids, including a mineral oil, a synthetic ester and a natural ester. The clean transformer liquids were also artificially contaminated by copper particles of μm size, and the relationship between the AC breakdown strengths and the amount of copper particles was determined....
Nickel oxide nanoparticles were synthesized by a simple aqueous solution method with carbon black powder. X-ray diffraction analysis shows that the mean size of the synthesized nickel oxide is 8.3 nm, which is much smaller than that obtained from other two methods without carbon black powder annealed at 350°C (21.1 nm) and with carbon black powder annealed at 600°C (15.6 nm). Accordingly, the specific...
This paper addressed several critical issues that impact the performance of the larger-sized dye sensitized solar cells (DSSCs). We have demonstrated that the photoanode has the significant effect on the performances of DSSCs including the short current, open voltage, fill factor and conversion efficiency. Several novel structure designs on the photoanode are proposed to improve the performance of...
The composite of nano-ZnO/LDPE was prepared via the method of double-solution mixture. Space charge distribution, volume resistivity and ac breakdown strength were measured in LDPE and its composite by adding nano-ZnO with different mass proportions before and after photo-oxidation for several days. It was found that 3 wt% ZnO nano-particles could effectively improve the photo-stabilization of LDPE...
High-power photo conductive semiconductor switches with a gap of 12 mm were fabricated from semi-insulating GaAs, in which carbon acceptor impurity was compensated by deep EL2 donor defect, resulting in very large dark resistivity. Triggered by laser pulse with different optical energy at wavelength of 1064 nm and 532 nm, photoconductivity tests of the PCSS at different bias voltage are underway....
Dielectric barrier discharge of helium at atmospheric pressure was investigated. Two plane-parallel electrodes, each covered by a 1-mm thick quartz plate, are 50 mm in diameter and the gas gap is 5 mm in length. Powered by an alternative voltage with a frequency of 33 kHz, a homogenous discharge was produced and characterized by one current pulse per half cycle of the applied voltage. The development...
Dielectric barrier discharge (DBD) with multi-needle to plane electrodes is attractive for some commercial use, especially air pollution control. The effect of electrodes' configuration on discharge behaviour is remarkable, as well as its applications. However, structural optimization of multi-needle to plane electrodes has not been studied systematically. In this paper, the space between nearby needles...
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