fast rise-time voltage surges surges from a circuit breaker closing can lead to an electrical breakdown of the turn insulation in motor srator windings [1]. If the turn insulation is of an insuffcient thickness or has aged in service, the insulation will puncture when a short rise-time voltage surge occurs. Punctured turn insulation allows for a very high circulating current to flow into the af...

Frequency Domain Spectroscopy (FDS) is an effective tool allowing assessing the condition of oil-paper insulation system in power equipment. However, results from these measurements are known to be greatly influenced by various parameters, including insulation aging, moisture content, and insulation geometry/volume, together with environmental condition such as temperature. In this contribution...

Gas Insulated Switchgear (GIS) has been widely used in substations. The insulating medium used in GIS is sulfur hexafluoride (SF6) gas. However, the internal insulation defect existed in GIS would inevitably lead to partial discharge (PD), and cause the composition of SF6 to SOF2, SO2F2 and SO2 and other characteristic component gases. The decomposition phenomenon would greatly reduce the insul...

This paper describes the first steps taken by the IEEE Dielectrics and Electrical Insulation Society in defining their contributions to the Smart Grid concept. Keywords-Smart Grid, IEEE DEIS, diagnostics, monitoring, electrical insulation

BACKGROUND Silicone catheter insulation, larynx prostheses undergo biodegradation. The aims of the study were to verify the conviction that outer silicone lead insulation is biostable and inert in addition to determining the role of macrophages (M) and Staphylococcus aureus (S aureus) strains in the silicone lead insulation degradation. METHODS AND RESULTS Leads removed from 8 patients becaus...

New European product standards now include a mandatory requirement for manufacturers to declare the temperature-dependent thermal conductivity for each insulation used in building equipments and industrial installations. For pipe insulation systems, the measurement is usually performed by a standard pipe test method, in which the value on a large temperature range is integrated to reduce temper...

In modern propulsion applications of tractions drives, voltage source inverter-fed three phase AC machines are preferred due to their flexibility and high dynamic torque properties. However, the fast switching of the inverter (high dv/dt rates) causes increased stress for the motor windings and leads to insulation degradation. Thus, insulation condition monitoring is getting more and more impor...

In this paper, accelerated multi-factor aging tests in laboratory have been conducted on the stator ham of a large generator. During the period of aging, the temperature spectra of dielectric dissipation factor tan 6 of stator insulation were employed to investigate aging characteristics of insulation materials. Test results showed that the peak temperature T,,, of the tan 6 -T curve under 0.2U...

Whether your pocketbook or the planet is your chief concern, energy efficiency can add up to a lot of savings. Reducing energy demand reduces the amount of fossil fuel combustion needed to heat and cool homes, which in turn decreases the amount of carbon dioxide emitted into the atmosphere. In terms of your pocketbook, reducing your energy consumption means lower utility bills. While there are ...

this paper presents an investigation on the effect of temperature and raw material on microstructure of fine cellular foam used as the insulation of coaxial cables. a set up was prepared and used to produce fine cellular foamed insulation. as the physical  blowing agent, butane was used. the effect of temperature on the microstructure of polyethylene (pe) was worth to note. at high temperature,...