Fundamental and low frequency harmonic components of leakage current as a diagnostic tool to study aging of RTV and HTV silicone rubber in salt-fog

2003 ◽  
Vol 10 (1) ◽  
pp. 128-136 ◽  
Author(s):  
A.H. El-Hag ◽  
S.H. Jayaram ◽  
E.A. Cherney
Keyword(s):  
Leakage Current ◽  
Silicone Rubber ◽  
Diagnostic Tool ◽  
Low Frequency ◽  
Harmonic Components ◽  
Salt Fog ◽  
Frequency Harmonic

scholarly journals A parameter design method for multifrequency perfect sound-absorbing metasurface with critical coupled Helmholtz resonator

2021 ◽  
pp. 146134842110196
Author(s):  
Sun Wei ◽  
Li Li ◽  
Chu Zhigang ◽  
Li Linyong ◽  
Fan Xiaopeng
Keyword(s):  
Sound Absorption ◽  
Design Method ◽  
Structural Parameters ◽  
Low Frequency ◽  
Helmholtz Resonator ◽  
Programming Algorithm ◽  
Structural Parameter ◽  
Efficient Design ◽  
Harmonic Components ◽  
Frequency Harmonic

The low-frequency harmonic components of urban substation noise are easy to annoy the residents. Multi-frequency perfect sound-absorbing metasurface based on the Helmholtz resonator (HR) is an alternative solution to suppress the low-frequency harmonic noise. This paper proposes an efficient design method of structural parameter for the multi-frequency perfect sound-absorbing metasurface. Taking the perfect sound absorption at the target frequency as objective and the structural parameters of HR as optimization variables, the structural parameter optimization model of multi-frequency perfect sound-absorbing metasurface is established and solved by the sequential quadratic programming algorithm. The proposed design method effectively overcomes the deterioration of sound absorption performance caused by the combined design of multiple perfect sound absorption units. Utilizing the proposed method, we designed a multi-frequency perfect sound-absorbing metasurface to absorb the four harmonic components of an urban substation noise simultaneously. The finite element simulation results and the experimental results of the physical sample indicate that the designed multi-frequency perfect sound-absorbing metasurface can satisfy critical coupling to achieve perfect sound absorption at all target frequencies.

Harmonic components of leakage current as a diagnostic tool to study the aging of insulators

2008 ◽  
Vol 66 (3-4) ◽  
pp. 156-164 ◽  
Author(s):  
Hussein Ahmad ◽  
M.A. Salam ◽  
Lee Yi Ying ◽  
N. Bashir
Keyword(s):  
Leakage Current ◽  
Diagnostic Tool ◽  
Harmonic Components

Electrical Characteristics of Silicone Rubber as Insulation Materials

2015 ◽  
Vol 1119 ◽  
pp. 317-323 ◽  
Author(s):  
Mohamed Abd El-Khalek ◽  
Loai Saad Nasrat ◽  
Mahmoud Abd El-Hamed ◽  
Soliman El-Debeiky
Keyword(s):  
Leakage Current ◽  
High Voltage ◽  
Silicone Rubber ◽  
Time To Failure ◽  
Electrical Characteristics ◽  
Insulation Materials ◽  
The Relationship ◽  
Salt Fog

This paper presents the results of a study carried out to examine electrical characteristics of high voltage Silicone Rubber (SIR) insulators under weather pollution conditions. The specimens of SIR with and without Alumina tri-hydrate (ATH) filler have been chemically prepared. The AC (50 Hz) surface aging of SIR specimens have been evaluated under salt fog chamber. Furthermore, the relationship between the leakage current and time to failure for SIR specimens with various concentrations of ATH filler under different weather pollution conditions has been measured in this work.

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