The insulation pressboard is very important in the of oil-immersed transformers, which determines useful life transformer. In order to analyze change micro topography under condition thermal aging detail, samples different periods were made. Image enhancement, denoising, segmentation, optimization, edge detection, expansion, and corrosion used process SEM images after aging, so as extract fiber...

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...

Polarization and Depolarization Current (PDC) testing is a non-destructive dielectric testing method to determine the conductivity of insulations. It is one of the dielectric d iagnostic techniques based on time domain measurement. PDC measurement technique has gained immense popularity due to its ability to assess the condition of HV insulation. PDC measurement can provide information about th...

In this study, we discuss about the energy saving in different type of building walls by using optimum insulation thickness with suitable insulation material. The energy saving is maintained by reducing the energy consumption in buildings. Heat losses from building envelope have a major share in waste of energy. So it is essential to save the energy by using optimum insulation thickness. The in...

The objectives of the present study were to evaluate the effects of scrotal insulation on sperm production, semen quality, and testicular echotexture in Bos indicus and Bos indicus x Bos taurus crossbred bulls. In one experiment, B. indicus bulls (n=12) were allocated to control and whole-scrotum insulation groups, while in a second experiment, crossbred bulls (n=21) were allocated into control...

TiO2 nanoparticles can improve the electrical performance of oil paper insulation. In this study, 10 nm were prepared and dispersed into transformer oil, then immerse pressboards in it to obtain nanofluid impregnated (NP). Its thermal aging was accelerated together with reference sample at 130°C for 36 days. Analyzing acid value polymerization degree, surface topography, AC breakdown strength, ...

Conventional dielectric response measurement techniques, for instance, recovery voltage measurement (RVM), frequency domain spectroscopy (FDS) and polarization–depolarization current (PDC) are effective nondestructive insulation monitoring techniques for oil-impregnated power transformers. Previous studies have focused mainly on some single type of dielectric measurement method. However, the co...

Chemical compounds dissolved in insulating oil, as indicators can excellently monitor the paper aging condition, which has attracted increasing interest areas of transformer condition monitoring and fault diagnosis. Because their outstanding features, such good correlation with degree polymerization cellulose aid non-destructive online monitoring, chemical have been effectively used for assessm...