BACKGROUND Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of homes in the United States, Canada, and other countries. OBJECTIVE This report describes asbestos-related occupational respiratory dise...

ii Τὸ εὖ γίνεσθαι μὲν παρὰ μικρόν, οὐ μὴν μικρὸν εἶναι. Abstract The world's first commercial High Voltage Direct Current (HVDC) transmission link was built in 1954 between the Swedish mainland and the island of Gotland. At that time, it was proved that HVDC transmission is technically feasible. Since then, HVDC cable systems have been used worldwide in electrical energy transportation. Most HV...

Partial discharges result in cable line faults that can occur defective insulation systems made of rubber, polyethylene, XLPE, and flexible PVC. Insulation defects may due to disruptions their production process, installation, operational conditions. Therefore, the diagnostic monitoring partial discharge occurrence help prevent emergencies damaged sections. registration is a non-destructive met...

Polyethylene exhibits many key characteristics including low dielectric loss, high breakdown strength and good processability. Most modern extruded high voltage cables employ cross-linked polyethylene (XLPE) as the insulation material. The main advantage of XLPE is its excellent thermo-mechanical properties; it is relatively cheap and has low dielectric loss and low conductivity making it an id...

Carbon nanotubes (CNTs) are considered the most promising candidates to replace Cu and Al in a large number of electrical, mechanical and thermal applications. Although most CNT industrial applications require macro and micro size CNT fiber assemblies, several techniques to make conducting CNT fibers, threads, yarns and ropes have been reported to this day, and improvement of their electrical a...

Testing of high voltage apparatus for partial discharges has long been recognized as an important part of quality control for these devices. Recently, interest has been focused on methods for testing low voltage cables to determine their integrity under adverse operating conditions such as a loss of coolant accident. A new method, utilizing partial discharges, is presented which has the potenti...

In this paper, the discrete wavelet transform (DWT) and a chaotic system were combined with convolutional neural network (CNN) applied to diagnosis of insulation faults in XLPE (cross-linked polyacetylene) power cables. First, four different types cables constructed, including normal state cable, short outer semi-conducting layer, impurities layer damage, high-speed capture card (NI PXI-5105) w...

Abstract The buffer layer defects of high‐voltage crosslinked polyethylene (XLPE) cable occur frequently, which makes the detection method become focus to be studied. Here, broadband impedance technology for XLPE cables with corrugated aluminium sheath is investigated. There are nine samples, including new and defective ones. Some artificial, other retired cables. influence wiring mode, circumf...

Modern spectral and harmonic analysis is based on Fourier transforms. However, these techniques are less efficient in tracking the signal dynamics for transient disturbances in power system engineering. Consequently, the wavelet transform has been introduced as an adaptable technique for non-stationary signal analysis. Although the application of wavelets in the area of power system engineering...