Materials Literature
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The results show that the degree of water treeing in HV XLPE cables (36 kV and above) is strongly dependent upon the cable design and the service (system) voltage. The water trees are typically relatively short, but their density is similar to that observed in medium voltage cables with similar design. The results fro…
Partial discharge (PD) online monitoring of MV switchgear was implemented in several large industrial plants beginning in 1998. A switchgear manufacturer completed offline testing and calibration to determine the type and location of sensors for measuring the effective sensitivity of partial discharge activity. This p…
Resist stripping and cleaning is evaluated on a RF asher. A combination of RF and MW power can be used to enhance the stripping efficiency in the asher. The RIE components of a plasma are capable of producing plasma damage (can be observed in structures such as thin gate oxide underneath poly lines). In this evaluatio…
There are two methods available for the online monitoring of mica-based insulation associated with high-voltage machines. Partial discharge analysis, PDA, is a time domain technique that measures and classifies electrical impulses that often occur at stator defects. Electromagnetic interference analysis, EMI, is a fre…
We have previously developed a label-free optical method to study biomolecular interactions in real time at the surface of an optically transparent substrate. The method relies on the change in the absorbance spectrum of a self-assembled monolayer of gold nanoparticles on glass as a function of biomolecular binding at…
The experimental data for surface flashover in polymethyl methacrylate (PMMA) at oil/vacuum interface by ramp input pulses are presented. The spacer is a conical frustum varying in length from 1 mm to 3 mm and in angle from 70/spl deg/ to 70/spl deg/. With the slope dV/dt of the input pulse, flashover field varies fro…
Thermal test chip is widely used for package thermal characterization. An "ideal" test chip should be designed in such a way that the heating element covers the entire die area and the heat is generated uniformly across the die. Unfortunately, due to the constraint of other testing structures on the same test die or t…
Despite the long-time use of space-charge electrets in various commercial applications, the mechanism of charge storage is still poorly understood. To study the energy distribution of deep traps, photostimulated discharge spectra of electron-beam and corona-charged polytetrafluoroethylene (PTFE), polyethylene terephth…
Characterization of ferroelectric ceramics using x-ray diffraction, transmission electron microscopy, and x-ray photoelectron spectroscopy, Jae-Nam Kim, Kwang-Soo Shin, Byung-Ok Park, Jin-Hong Lee, Nam-Kyoung Kim, Sang-Hee Cho
The torque is measured in a contactless technique without special treatment of the shaft, using the magneto-elastic effect of ferromagnetic materials. Strain or stress due to moments lead to a change of magnetic properties of the material (hysteresis deformation, permeability changes). Magnetoelastic sensors are disti…
Ternary tungsten carbo nitride WCN films and titanium nitride TiN films were deposited with atomic layer deposition as diffusion barrier materials for copper metallisation. The growth behaviour on different substrates and surface closure was studied by Rutherford backscattering spectroscopy (RBS). It was demonstrated…
Discharge signatures have been studied in a combined transformer oil/impregnated paper insulation system subjected to AC high voltage. A semi-homogeneous sphere-plane electrode configuration was used to simulate wedge discharges in a power transformer. The moisture level of the impregnated paper was varied between 0.3…
Presents a model providing time-dependent solutions for charge densities, field and electroluminescence in dielectric films under uniform dc field. The model encompasses bipolar carrier production, trapping and recombination phenomena. Numerical simulation is applied to transport in low density polyethylene (LDPE).
For buried gas insulated transmission lines (GILs), a coating against corrosion is absolutely necessary and similar to most other directly buried metallic installations. Active corrosion protection, also called catholic protection, may be added to take care about possible failures of the coating as an additional quali…
The development of time-frequency and time-scale transforms has progressed quickly for 20 years. This development and the progression of the numerical acquisition enable the utilization of these mathematical tools to analyze partial discharges (PD) in the induction motors insulation. Some papers have been written abou…
The adoption, in electrical drives, of power supplies equipped with fast electronic devices lead to new "life" problems (e.g. degradation due to partial discharges) which impact on the design of the relevant electric machines insulation systems. Hereby are reported some results of an investigation about the behaviour…
Switched polarization fatigue was investigated for CVD PZT ferroelectric films of thickness <100 nm. The data shows that negligible switched polarization degradation occurs during an initial incubation period, CTF*, which can last up to /spl sim/10/sup 8/ polarization reversal cycles. This incubation period was found…
Partial discharge (PD) is identified as a main factor contributing to the insulation deterioration in HV equipment including underground cable. This is the first time an attempt has been made to investigate the effect of soil thermal resistivity on PD activities in underground power cables. In this paper, a detailed e…
This work presents a new modeling strategy to account for the energy stored in the volume around the air gap in gapped magnetic components. The approach is based on the Schwarz-Christoffel transformation, which has been extended to axisymmetrical magnetic components. The results have been validated by means of compari…
The surface charge decay and space charge distribution in corona-charged low-density polyethylene (LDPE) were investigated. The space charge distribution was measured at 30/spl deg/C with the pulsed electro-acoustic (PEA) method, where a corona charged specimen was set between a semiconductive electrode and an Al elec…