Results 251 to 260 of about 293,449 (289)

A thermal conductivity model for microporous insulations in gaseous environments

International Journal of Heat and Mass Transfer, 2019
Abstract Ceramic insulations are often used to mitigate heat losses from high temperature systems. In the case of thermal batteries, insulation is exposed to high temperatures, high axial loads, shock and vibration scenarios, and alternate gaseous environments.
Alexander Headley, Michael Hileman, Aron Robbins, Edward Piekos, Patrick Fleig, Adam Martinez, Christine Roberts   +6 more
openaire   +1 more source

Influence of stressing on gaseous decomposition products in insulating liquids

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239), 2002
This paper deals with investigations on the gaseous decomposition products of insulating liquids: mineral oil, ester liquid, and silicone liquid. The investigations point out that the gaseous products depend on the kind of decomposition; as for example PD stressing or thermal decomposition.
K. Dumke, H. Borsi, E. Gockenbach
openaire   +1 more source

Byproducts in the Insulating Gaseous Matrix of a Gis

2001
Sulfur hexaflouride (SF6) is a man-made gas, offering excellent electrical, thermal, and acoustical insulation properties, and as such, it has been extensively employed for a variety of applications, i.e. power distribution (mainly), semiconductor foundries, metallurgy, tracer gas, sound sealing (double glazing, torpedo noise silencer), thermal sealing,
Constantine T. Dervos, Panayota Vassiliou   +1 more
openaire   +1 more source

Fluorinated epoxy insulator with interfacial conductivity graded material for HVDC gaseous insulated pipeline

IEEE Transactions on Dielectrics and Electrical Insulation, 2020
In this paper, a novel procedure is put forward to fabricate epoxy insulators with surface functionally graded material (SFGM) with optimized surface conductivity as obtained from the field non-uniformity and the leakage current. For fabrication, a temperature control system is employed to form a spatial temperature gradient, thus regulating ...
B. X. Du, Z. Y. Ran, J. Li, H. C. Liang, H. Yao   +4 more
openaire   +1 more source

Gaseous Insulation for High-Voltage Transformers [includes discussion]

Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1952
It is well recognized that sulfur-hexafluoride (SF6) possesses, even at relatively low pressures, superior insulating properties for high-voltage apparatus. Under certain conditions the dielectric strength of this gas can be superior to either liquid or solid insulating materials.
G. Camilli, G. S. Gordon, R. E. Plump
openaire   +1 more source

Gaseous Ionization in Built up Insulation

Transactions of the American Institute of Electrical Engineers, 1923
It has been suggested frequently that the failure of high-voltage armature bars might be due to deterioration caused by gaseous ionization in entrapped air spaces. In an earlier paper a series of tests on a number of 6600-voltage mica folium armature bars made up with different degrees of mica content was described.
openaire   +1 more source

Applications of gaseous insulants to switchgear

2013
This chapter introduces the subject of gaseous insulation and provides information relating to the application of gaseous insulants to high-voltage systems. It examines atmospheric air and compressed gases and illustrates how, by linking available experimental test data from such sources with a knowledge of the 'effectiveness' of various practical gas ...
openaire   +1 more source

Applications of gaseous insulants

2001
This chapter introduces the subject of gaseous insulation and provides information relating to the application of gaseous insulants to high voltage systems. It examines atmospheric air, compressed gases and illustrates how, by linking available experimental test data from such sources with a knowledge of the 'effectiveness' of various practical gas-gap
openaire   +1 more source

Measurement of Gaseous Diffusion within Zero ODP Cellular Plastic Insulation

Journal of Cellular Plastics, 1997
Diffusion coefficients (D) of blowing agents and air in cellular plastic insulation are the key parameters in determining the thermal quality and dimensional stability of the foams. Measurement methods available for this purpose are briefly discussed. An apparatus based on the so called diffusion chamber method has been designed in
Kokko, Erkki, Fan, Youchen
openaire   +3 more sources

Dielectric behaviour of gaseous insulation with synthetic air at AC stress

2016 17th International Scientific Conference on Electric Power Engineering (EPE), 2016
The paper deals with basic investigation of AC breakdown behaviour of gaseous insulation with synthetic air at different level of field homogeneity and gas pressure. The measurement was performed at different gas pressure ranging from 0.1 to 0.25 MPa and gap distances from 1 to 9 cm, using an electrode test-set “tip-bowl”.
Rainer Haller, Petr Martinek, Roman Hamar, Eva Mullerova   +3 more
openaire   +1 more source