The partial discharge (PD) leads to catastrophic failure of the medium voltage (MV) switchgear insulation. Determination PD source (defect) location in high (HV) equipment is very important maintenance procedures and isolating root cause generation. In this paper, transient earth (TEV) detection method was used acquire defect-initiated signals a simulated MV model. An array four TEV sensors wer...

This article presents the results of economic and energy analysis operation five types windows in residential buildings. The aim this study was to determine (a) what extent construction various insulation parameters affect operating costs buildings, when using different heating systems, (b) significant cost purchasing with better is compensated by lower building (heating lifecycle windows), (c)...

This research verified the applicability and effectiveness of the ultrasonic monitoring of sediments stuck on the inner wall of polyvinyl chloride (PVC) pipes. For identifying the transmittance of acoustic energy and the speed of sound in the PVC material, the pulse-echo ultrasonic testing was conducted for PVC sheets of different thicknesses. To simulate the solidified sediment, the hot melt a...

This paper presents an approach to the suppression of the emission of dioxin and its precursors as a result of the co-incineration of poly (vinyl chloride) (PVC) with TiO2-encapsulating polystyrene (TEPS), in which TiO2 nanoparticles with the capacity to adsorb dioxin and its precursors are encapsulated without significant agglomeration. Field-emission scanning electron microscopy (FE-SEM) and ...

Submit Manuscript | http://medcraveonline.com PVC has significant defects due to its quick decomposition at temperature higher than 130°C [3-5]. This process results in a significant change in color, reducing the mechanical properties and the generated HCl exacerbates the decomposition of PVC, so the usage of PVC thermal stabilizers is inevitable [4,6]. Our group had synthesized pentaerythritol...

Objectives: The Percentage of vowel correct (PVC) is one of the indices in the development of articulation and phonological skills in children that can be measured with speech samples that could be extracted from the single word or connected speech tests. The aim of this study is to introduce the PVC scale in Persian speaking children and investigate its validity and reliability. Methods: Th...

Oil-impregnated paper is widely used in power transmission equipment as a reliable insulation. However, copper sulphide deposition on oil-paper insulation can lead to insulation failures in power transformers. This paper presents the influences of copper sulfur corrosion and copper sulphide deposition on copper wires and oil-paper insulation in power transformers. Thermal aging tests of paper-w...

PVC/NiFe2O4/Fe2O3 compositewas successfully synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). Also, the catalytic activity of PVC/NiFe2O4/Fe2O3 has been considered in the synthesis of two arylidene barbitu...

Moisture inside the footwear can considerably affect the thermal insulation. In this study with a thermal foot model there was simulated three sweat rates (3, 5 and 10 g/h). Five types of footwear with various insulation levels (dry insulation from 0.19 to 0.50 m2 · K/W) were tested. The footwear insulation reduction was calculated for 1.5 hour period. The reduction in insulation was related to...