Results 221 to 230 of about 70,024 (254)
Some of the next articles are maybe not open access.
Electrical Engineering, 2016
In a previously published work, performances of three practical earthing systems consists of 2, 3 and 4 rod-bed electrodes buried at the same site, thus the same soil resistivity were investigated. It was found that the degree of reduction of the earth resistance values is the highest in the poor earthing systems (2 rod electrodes).
Abdullah, Saleha +2 more
openaire +2 more sources
In a previously published work, performances of three practical earthing systems consists of 2, 3 and 4 rod-bed electrodes buried at the same site, thus the same soil resistivity were investigated. It was found that the degree of reduction of the earth resistance values is the highest in the poor earthing systems (2 rod electrodes).
Abdullah, Saleha +2 more
openaire +2 more sources
IEEE Transactions on Plasma Science, 2016
The objective of this paper is to investigate an influence of high-frequency high-voltage impulse conditioning on the back-to-back capacitor bank switching performance of vacuum interrupters (VIs). Nine identical 7.2-kV VIs were tested by 80 CO operations after the proposed conditioning. Test inrush currents were set to 0-, 2-, and 5-kA peak.
Yingyao Zhang +6 more
openaire +1 more source
The objective of this paper is to investigate an influence of high-frequency high-voltage impulse conditioning on the back-to-back capacitor bank switching performance of vacuum interrupters (VIs). Nine identical 7.2-kV VIs were tested by 80 CO operations after the proposed conditioning. Test inrush currents were set to 0-, 2-, and 5-kA peak.
Yingyao Zhang +6 more
openaire +1 more source
AIAA Journal, 2015
A tunable diode laser-based H2O absorption diagnostic has been developed to characterize transient phenomena within the Stanford Expansion Tube Flow Facility. A measurement rate of 25 kHz was achieved to identify and investigate transient flow structures within the ∼600 μs facility test time.
Christopher L. Strand, Ronald K. Hanson
openaire +1 more source
A tunable diode laser-based H2O absorption diagnostic has been developed to characterize transient phenomena within the Stanford Expansion Tube Flow Facility. A measurement rate of 25 kHz was achieved to identify and investigate transient flow structures within the ∼600 μs facility test time.
Christopher L. Strand, Ronald K. Hanson
openaire +1 more source
Effect of Enhancement Materials When Mixed with Sand Under High Impulse Conditions
2006 IEEE 8th International Conference on Properties and applications of Dielectric Materials, 2006To date, there is no data describing the characteristics of enhancement materials mixed with soils under impulse conditions are published. In this research, it is aimed to investigate the characteristics of enhancement materials, copper sulphate (CuSO4 ) and sodium chloride (NaCl) mixed with soils under impulse ...
openaire +1 more source
Nondestructive Testing and Evaluation, 2012
This paper is devoted to the description of the double reflection type as an important basic case (as well as single reflection type) and gives some introduction to the phenomenology of elongated reflections in ground-penetrating radar (GPR) diagnostics of bituminous pavement. The single reflections correspond to simple velocity contrast between layers
Lech Krysiński, Jacek Sudyka
openaire +1 more source
This paper is devoted to the description of the double reflection type as an important basic case (as well as single reflection type) and gives some introduction to the phenomenology of elongated reflections in ground-penetrating radar (GPR) diagnostics of bituminous pavement. The single reflections correspond to simple velocity contrast between layers
Lech Krysiński, Jacek Sudyka
openaire +1 more source
European Transactions on Electrical Power, 2007
AbstractThe study on the physics of discharges in soil and performance of earthing networks subjected to lightning currents are important in order to improve the reliability of electrical systems and to obtain better electrical models of earthing systems.
Nor, N. Mohamad, Ramli, A.
openaire +2 more sources
AbstractThe study on the physics of discharges in soil and performance of earthing networks subjected to lightning currents are important in order to improve the reliability of electrical systems and to obtain better electrical models of earthing systems.
Nor, N. Mohamad, Ramli, A.
openaire +2 more sources
2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2013
The objective of this paper is to investigate back-to-back capacitor switching restrike characteristics of vacuum interrupters (VIs) after conditioning by using a series of high-frequency sub-microsecond voltage impulses. 7.2 kV VIs are conditioned by several hundreds of batches of sub-microsecond high voltage impulses (1000Hz, 0.1s). The peak value of
null He Yang +5 more
openaire +1 more source
The objective of this paper is to investigate back-to-back capacitor switching restrike characteristics of vacuum interrupters (VIs) after conditioning by using a series of high-frequency sub-microsecond voltage impulses. 7.2 kV VIs are conditioned by several hundreds of batches of sub-microsecond high voltage impulses (1000Hz, 0.1s). The peak value of
null He Yang +5 more
openaire +1 more source
Journal of Sound and Vibration, 1966
Abstract The pure tone and speech attenuation characteristics of V 51 R and Selectone-K earplugs have been measured in the laboratory, and their effects on speech communication have also been measured under field conditions of quiet and impulsive noise back grounds.
R.R.A. Coles, C.G. Rice
openaire +1 more source
Abstract The pure tone and speech attenuation characteristics of V 51 R and Selectone-K earplugs have been measured in the laboratory, and their effects on speech communication have also been measured under field conditions of quiet and impulsive noise back grounds.
R.R.A. Coles, C.G. Rice
openaire +1 more source
2001
15-18 OCT. 2001, CAPUA ITALY, ESA SP-
POZZI, AMILCARE, TOGNACCINI, RENATO
openaire +3 more sources
15-18 OCT. 2001, CAPUA ITALY, ESA SP-
POZZI, AMILCARE, TOGNACCINI, RENATO
openaire +3 more sources
11th International Symposium on High-Voltage Engineering (ISH 99), 1999
Air as insulating material has been studied a lot. However, for altitudes greater than 2000 meters above sea level, not many projects have been accomplished. The international standard establishes correction factors for atmospheric conditions that have not yet been studied for low-pressure conditions.
openaire +1 more source
Air as insulating material has been studied a lot. However, for altitudes greater than 2000 meters above sea level, not many projects have been accomplished. The international standard establishes correction factors for atmospheric conditions that have not yet been studied for low-pressure conditions.
openaire +1 more source