Andrea Martinez
(University at Buffalo, The State University of New York)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Dielectric Elastomer Actuators (DEAs) are electroactive polymers capable of achieving high actuation. The key to achieving these high actuation strains is to make both the electrodes and the elastomer highly compliant without sacrificing their dielectric strength or conductivity. DEAs, because they are soft materials designed to exert mechanical stress, often break down because of mechanical...
Mr
Tonglei Wang
(Xi'an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The aim of this study was to clarify the hydrostatic pressure effect on the initiation and propagation process of oil streamers under the application of pulsed voltage with different polarities. The statistical characteristics of the impulse breakdown voltage and time lag in transformer oil were studied over a wide range of hydrostatic pressure, and the statistical discharge time lag and the...
Veda Prakash Gajula
(Institute for Plasma Research)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Liquid dielectric breakdown properties are studied towards the development of efficient intermediate storage devices for pulsed power applications. A Tesla based pulse generator along with suitable voltage (V-dot) and current (self-integrating Rogowski coil) sensors are indigenously developed. The experiments are performed by applying few 100 KV with few tens of nanosecond pulse under uniform...
Prof.
Pietro Romano
(Palermo University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The purpose of the present work is to evaluate the dielectric response, in presence of multiple voids, analysing Partial Discharge measurements and simulations. Air voids are simulated inside specimens, one or two vacuoles have been taken into account in different positions and with different diameters, and partial discharges patterns have been traced. The approach combines the known circuit...
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The partial discharge inception voltage (PDIV) and insulation lifetime of the insulation systems for rotating machines driven by power electronics should be evaluated using repetitive impulsive voltages according to standards or technical specifications released by International Electrotechnical committee[1,2] . However, unlike the sophisticated technologies for partial discharge (PD)...
Dr
Marek Florkowski
(ABB Corporate Research)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Ubiquitous involvement of power electronics devices in the power conversion applications on various voltage levels makes new challenges for the design of insulation systems. The fast switching processes produces complex stresses and high frequency phenomena interplaying with charge behavior in dielectric insulating materials. The converters and inverters utilize usually the most widely...
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Space charge accumulation is theorized to be a contributor to partial discharge activity. The analysis of partial discharge (PD) activity is a method of predicting electrical breakdown in dielectric materials. Rapid aging tests of an acrylic dielectric elastomer using a partial discharge analyzer (PDA) has shown that under DC voltage application consisting of a 1 minute period of constant...
Ivan Punanov
(Institute of Electrophysics UB RAS)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Perfluorinated delectric liquids are perspective for using in high-voltage devices because of their chemical stability under electrical discharges. For applications like liquid spark gaps, velocity of breakdown is an important parameter. In this work the results of measurement of velocity of anode-initiated electrical breakdown at 140 kV in perfluorinated liquids of different chemical classes...
Dr
Fermin P Espino-Cortes
(SEPI ESIME Zac IPN)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Many of the failures in rotating electrical machines can have mechanical origin. One of these conditions is the vibration of the windings, something that can occur when the coils become loose in the slot. In medium voltage form-wound coils, a small oscillating movement can lead to the wear by fretting of the conductive armor coating in contact with the stator core wall. Once the conductor...
Mr
Meng Gao
(Xi'an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Solid insulation tends to absorb moisture during the operation and maintenance of oil-immersed transformers, which could be dangerous to the insulation especially in dynamic rating conditions.As has been reported, insulation with much moisture could cause bubble effect in turn-to-turn insulation when the load of transformer increases rapidly.
Primarily, this study theoretically analyzed the...
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The bubble mechanism based on field emission has long been considered to be responsible for breakdown in liquid under impulses with duration of microseconds. Hence, it is quite reasonable to associate the breakdown voltage with the metal electrode materials.
In this paper, we took 25# transformer oil as the liquid insulating dielectric, which had been degassed and dried for 12 hours in...
Yanjie Cui
(Xi'an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Insulation paper immersed with transformer oil is used as an electrical insulation medium in transformer for its high breakdown field strength. In the normal operation state of higher voltage power transformers, the defects in insulation medium can cause partial discharge(PD) which do harm to insulation materials, resulting in a shortened life of oil immersed paper. PD activities vary...
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The Insulating materials often work in terrible conditions with high temperature and full of metal vapor. For example, the electrical insulator of high voltage circuit breaker repeats breaking the arc frequently, resulting in electrode erosion. Electrode erosion makes the metal vapor and it will be attached to the insulator surface, greatly affecting the Insulation property. This paper mainly...
