Materials Literature
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This paper entails the design and development of a Partial Discharge processing and analysis system (PDPAS) for the acquisition and analysis of partial discharges (PD) which can measure the phase ‘$\Phi^{\prime}$, charge magnitude ‘q’ and number of pulses ‘n’ occurring in a given AC power line cycle and plot them in a…
A critical aspect to be addressed through materials engineered for aerospace missions is to provide the protection of space subsystems from the aggressive operative environment, in order to extend the life of such subsystem. Taking this fact into account, carbon-based ceramic composites are ideal candidates for the ne…
An electric utility company discovered delaminating underground low voltage secondary network cable insulation in service, in addition to damaged cables with exposed conductors. A condition assessment study was undertaken to characterize the insulation materials to provide insight into the observed cable condition and…
It is imperative that transformers in distribution and transmission substations function properly in order to avoid any damage or unnecessary system outages. There are diagnostic tests recommended in various international standards that can provide early evidence of possible issues within the equipment's overall healt…
Dielectric Dissipation Factor (DDF) measurements are used to assess the manufacturing quality of individual stator bars/coils and the dielectric behavior of the electrical insulation system of stator windings. The use of this diagnostic test method is widespread and standardized in IEEE and IEC documents. The new IEC…
For the cubic structures of analcime Na 1.71 (Al 1.8 ,Si 4.2 )O 12 ·2H 2 O, pollucite CsAlSi 2 O 6 and tetragonal (but pseudo-cubic) kirchhoffite CsBSi 2 O 6 and leucite KAlSi 2 O 6 the common stencil (pattern) of cation arrangement at the key positions of symmetry space groups related with configurations in spinel, d…
A new 1D Cd(II) complex [Cd(L-pheA)(Ac)] n (1) where the L-pheA − anion stands for the chiral ligand (L-phenylalanine hydroxamic acid) is synthesized and characterized. The single crystal X-ray analysis reveals that each Cd(II) atom is coordinated by three L-pheA − ligands and two acetate anions in a distorted seven-c…
Epoxy resin samples were prepared using cycloaliphatic resin and anhydride curing agents. Response Surface Methodology (RSM) was applied to determine the effect of five independent variables (Silbond W12EST, MoldXA400, CSR, PC1000 and BYK3701) at 5 levels on the dependent variables thermal shock crack resistance (TSR)…
Frequency Domain Spectrum analysis method (FDS), for its lots of advantages, has been widely concerned and applied in state characterization of insulating materials and insulation diagnosis of power equipment. However, in the current research, the characteristic parameters of FDS are not reliable and accurate enough i…
The PAR for IEEE P2465 was issued in 2017. Draft 9 of the document dated September 2019 contains sections on Measurement Circuits (both low frequency and HF/VHF), the Simulated Slot including measurement of clamping pressure, Method for calibration or normalization, Test voltages and protection, Conditioning and test…
Several papers have described the corrosion mechanisms induced by HAST at 110 or 130°C in copper wire packages. Most of them refer to intrinsic behavior (e.g. the ionic contamination level of the materials, wirebond quality), but there is limited work published on mechanisms induced as a result of extrinsic causes. On…
The dielectric loss is one of the vital indicators for the insulation status of power cables. However, the current dielectric loss measurement methods which have insufficient accuracy cannot meet field test requirements. In order to solve the shortcomings of the current method, this paper proposes a dielectric loss me…
This study investigates the toughness of 40-μm-wide nanotwinned Cu lines before and after annealing. The toughness of Cu lines was measured by tensile test, and different annealing temperatures and durations were used to examine the thermal stability of the nt-Cu films. The initial and post-annealed microstructures wa…
In this work, a systematic study of the dielectric spectra of full-scale medium-voltage (MV) ethylene propylene rubber- (EPR) and tree-retardant cross-linked polyethylene-(TR-XLPE) insulated cables is presented within the frequency range from 10-1Hz to 106Hz at various temperatures from 25 °C to 80 °C. The measured sp…
Surge testing of stator windings has long been used as part of incoming testing for inspections and documentation for machines with periodic maintenance plans. While IEEE 522 and IEC 60034-15 offer some guidance for performing the test on windings and windings which have been aged, neither offers acceptable results wh…
SiC-based nonlinear conductive stress grading tape (SGT) has been used at an end-turn stress grading system of a form-wound rotating machine. Although previous researches reported that high-frequency repetitive pulses cause electric field enhancement and local heating at the SG system, few paper deals with the detaile…
The diagnosis of XLPE cable lines by partial discharge (PD) has always been a key technical issue. As an important parameter reflecting the insulation status of XLPE cable equipment, partial discharge is closely related to its insulation status. A state evaluation method of cable based on the growth of electrical tree…
The recent developments in the application of the advanced composites in the construction industry for concrete rehabilitation and strengthening are increasing on the basis of specific requirements. A numerical analysis has been carried out to investigate the performance of reinforced concrete beam structure with natu…
With the increase in demand of economic, ecofriendly, and portable solar cell, Dye-Sensitized Solar Cells (DSSCs) is a promising candidate which may give the above demands. The main objective of this research work is to adopt Glancing Angle Deposition (GLAD) technique for developing novel Gold (Au) nanoparticles assis…
Very low frequency tan delta measurement (VLF-TD measurement) is one of the insulation diagnosis methods usually uses to diagnosis the condition of electrical cable insulation. However, this research focuses on using VLF-TD measurement with a gas-insulated transmission line (GIL). The 230kV, 2500A, single phase, GIL w…