Roya Nikjoo
(KTH Royal Institute of Technology)
08/07/2016, 10:00
Dielectrics, Insulation, and Breakdown
Oral Presentation
An important signature of degradation is usually linked to the onset of Partial Discharge (PD) activity within the insulation. The change in the PD pattern can concern the insulation degradation level. High voltage transients such as lightning and switching impulses are inevitable phenomena that happen in power systems. They can impose electrical stresses on the insulation system of power...
Mr
Kai Liu
(Xi’an Jiaotong University)
08/07/2016, 10:15
Dielectrics, Insulation, and Breakdown
Oral Presentation
SF6 is widely applied in gas insulated switchgear (GIS) due to its excellent insulating and arcing performance. However, the partial discharge often is caused by some insulation defects because of the production, installation and operation of the GIS. Under partial discharge, The decomposition products including SO2F2, SOF2, SO2, CF4, CS2, will be formed. The types, content and change trend of...
Mr
THIRUMURUGAN C
(IIT MANDI)
08/07/2016, 10:30
Dielectrics, Insulation, and Breakdown
Oral Presentation
**Purpose/Aim**
We need to understand one of the breakdown mechanisms of transformer dielectrics i.e. partial discharges (PD) in oil-pressboard composite insulation. In this study we conducted a PD experiment. Experimental results may be useful for online condition monitoring of large power transformer.
**Experimental/Modeling methods**
Effect of various impurities (i.e. Moisture in...
Dr
Ramachandra Balaiah
(P.E.S.College of Engineering), Prof.
sanjeev kumar
(Sri Siddhartha Institute of Technology)
08/07/2016, 10:45
Dielectrics, Insulation, and Breakdown
Oral Presentation
Sulphur can be present in mineral insulating oil and can manifest in stable, highly reactive and corrosive form. The corrosive sulphur reacts with the copper conductor in transformer and forms semi conductive copper sulphide at the surface of the copper conductor. The paper insulation used on the copper conductor may get damaged due to copper sulfide deposits which also affect the partial...
Guan-Jun Zhang
(Xi'an Jiaotong University)
08/07/2016, 11:00
Dielectrics, Insulation, and Breakdown
Oral Presentation
Surface flashover in vacuum across dielectrics usually happens in many pulse power devices, high power microwave (HPM), which seriously limits the transmission of HPM. Up to now, Secondary electron emission avalanche (SEEA) model is generally accepted to analyze the phenomena. The mechanism of SEEA is characterized into four continuous steps: (1) generation of initial electrons; (2) secondary...
Charlie Anderson
(Scientific Applications and Research Associates, Inc.)
08/07/2016, 11:15
High Power Microwaves
Oral Presentation
Ferrimagnetic-based nonlinear transmission lines (NLTLs) are actively researched as potential compact, phaseable sources of high power microwaves for various applications. The performance of the nonlinear microwave conversion process in gyromagnetic NLTLs is heavily dependent upon the properties of the ferrimagnetic materials and line geometries. A test bed for NLTL development has been...
Koviljka Stankovic
(University of Belgrade)
08/07/2016, 11:30
Dielectrics, Insulation, and Breakdown
Oral Presentation
Breakdown (dc and pulse) of noble gases at low values of the product of pressure and inter-electrode distance (pd) is investigated in the paper theoretically and experimentally. This range of the product pd is particularly important since the work point of gas filled surge arresters (GFSA) is found in it. The influence of gamma and X radiation on the volt-second characteristics of breakdown...
Dr
Yi Liu
(Huazhong University of Science and Technology)
08/07/2016, 11:45
Plasmas, Discharges, and Electromagnetic Phenomena
Oral Presentation
This paper aimed at investigating the dynamic shock wave induced by liquid pulsed current discharge to increase the intrinsic permeability of the cement sheath and rock in the oil well. It is believed that the blockage at the oil well perforation can be broken and removed from the bore-hole wall, and the fracture to increase the permeability of the hole-bottom region can be formed under the...
