The tunneling ability of the Formosan subterranean termite Coptotermes formosanus Shiraki through a cellulose insulation material containing11.1% boric acid was tested in choice and nochoice bioassays. We examined tunneling behavior and mortality of termites exposed to treated and untreated insulation material in miniature simulated wall voids. In a choice test termites tunneled through untreat...

Machine stator winding insulation degradation is one of the main results machine aging. It non-negligible once this process becomes asymmetric between phases. The traditional way to determine state health a partial discharge test. However, method requires system offline, which causes production loss and extra administrative burden. This paper presents an idea for better characterizing machine's...

Thermal modeling and temperature assessment of electrical machines often rely on the use lumped-parameter thermal networks. A historic limitation analytical models is their need for an experimental fine-tuning, necessary selecting appropriate values conductivity convection heat transfer coefficients. This evaluation procedure commonly carried out at design stage a new machine, by assuming that ...

Buildings account for a significant portion of a nation’s total energy consumption. To meet the global demand for greater energy efficiency, many countries are drastically strengthening insulation regulations for buildings. Thus, dramatically thicker wall insulation may be required, which can adversely affect the value of a building by reducing its effective floor area. Hence, high-performance ...

The converter transformer is an essential part of the DC transmission system. Compared with traditional oil-impregnated AC transformer, main insulation bears more complex electric field aging stress during long-term operation. influence proportion components in AC/DC composite on still unclear. Therefore, a combined test platform and thermal was built laboratory, accelerated tests oil-paper und...

This paper presents the application of model-based and data-driven approaches for prognostics and health management (PHM) of embedded planar capacitors under elevated temperature and voltage conditions. An embedded planar capacitor is a thin laminate that serves both as a power/ground plane and as a parallel plate capacitor in a multilayered printed wiring board (PWB). These capacitors are typi...

Determining the aging state of low-voltage nuclear power plant cables using a nondestructive and reliable condition monitoring technique is highly desirable as experience multiple stresses during service period. This paper deals with implementation investigation such techniques, which can detect overall instrumentation control (I&C) cables, are subjected to accelerated thermal aging. The di...