The insulation performance of SF6 insulated high voltage direct current apparatus are often analysed in a pure electric field or electro-thermal coupled while the fluid behaviour gas flow is ignored. However, frequent flashover along support insulators inside wall bushing indicates that characteristics may have considerable influence on interior bushing. This paper has simulated thermo-fluid ba...

Elastomers have wide and ever increasing applications in several industries. For example, elastomeric bushings are used in automotive suspension systems to reduce amplitude of vibrations as well as shocks. In this study, a compressible visco-hyperelastic approach is employed to investigate the behavior of these bushings. Time-discrete form of the material model (Exp–Ln visco-hyperelastic model)...

Abstract In order to reasonably evaluate the effectiveness of UHF sensor arrangement in online monitoring partial discharge bushing, it is necessary study electromagnetic wave propagation characteristics bushing. this paper, a three-dimensional model real transformer bushing established, XFDTD software used simulate raised seat defects and internal capacitive core field strength sensors are arr...

The parameter of tensile strength for transformer bushing insulating paper occupies an important position in the structural design and life evaluation bushing. In order to precisely achieve effect aging time moisture content on paper, samples with a thickness 0.13 mm were prepared dielectric testing under different contents states. results show that (MPa) decreases linearly range 0–648 h accele...

This paper uses longitudinal data from the Dutch OSA Labor Supply Panel (1980-2000) to examine the phenomenon of unemployment scarring in the Netherlands. The study extends current research by not only asking if earlier unemployment damages subsequent employment careers and wages but also explores variation by the level of unemployment insurance benefits and key individual characteristics such ...

Abstract Failure of the transformer bushing will cause to be powered down or damaged, affecting safe operation power system. This paper proposes a method using system harmonics as dielectric response excitation source and studies insulation online detection technology based on transient characteristics. The technical scheme structure monitoring characteristics are given. A calculation model sho...

The electric field optimization minimizing the strength on an electrode surface and providing its uniformity is important in designing high voltage power transformer bushings other apparatus from viewpoint of efficient utilization space. bushing with cylinder system has been designed tested this investigation. It was found that insulation method most factor to lower streamer initiation voltage....

Bearing bushing parts are used to support other rotating moving parts. When these bearing bushings made of bronze, their inner cylindrical surfaces can be finished by turning. The problem addressed in this paper was that identifying an alternative for finishing turning the taking into account specific sustainability requirements. Three alternatives have been identified. selection ensures highes...

Major issues of NBI power supplies are a high-speed switching, regulation and transmission of dc ultra high voltage, and suppression of surge energy input to the beam source at breakdown. A GTO(gate turn off thyristor) inverter type power supply where the control is performed at low voltage ac side was designed for the ITER NB. Based on the remarkable progress of a high power IEGT (injection en...