Acoustic emission measurement of partial discharges during electrical tree growth in XLPE cable insulation

2002 ◽  
Author(s):  
Y. Tian ◽  
P.L. Lewin ◽  
A.E. Davies ◽  
G.M. Hathaway ◽  
S.J. Sutton ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Tree Growth ◽  
Partial Discharges ◽  
Emission Measurement ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Electrical Tree ◽  
Acoustic Emission Measurement

scholarly journals Understanding Electrical Treeing Phenomena in XLPE Cable Insulation Adopting UHF Technique

2011 ◽  
Vol 62 (2) ◽  
pp. 73-79 ◽  
Author(s):  
Ramanujam Sarathi ◽  
Arya Nandini ◽  
Michael Danikas
Keyword(s):  
Tree Growth ◽  
Applied Voltage ◽  
Tree Structure ◽  
Partial Discharges ◽  
Cable Insulation ◽  
Underground Cables ◽  
Xlpe Cable ◽  
Defect Site ◽  
Electrical Trees ◽  
Electrical Treeing

Understanding Electrical Treeing Phenomena in XLPE Cable Insulation Adopting UHF TechniqueA major cause for failure of underground cables is due to formation of electrical trees in the cable insulation. A variety of tree structure can form from a defect site in cable insulationvizbush-type trees, tree-like trees, fibrillar type trees, intrinsic type, depending on the applied voltage. Weibull studies indicate that a higher applied voltage enhances the rate of tree propagation thereby reducing the life of cable insulation. Measurements of injected current during tree propagation indicates that the rise time and fall time of the signal is of few nano seconds. In the present study, an attempt has been made to identify the partial discharges caused due to inception and propagation of electrical trees adopting UHF technique. It is realized that UHF signal generated during tree growth have signal bandwidth in the range of 0.5-2.0 GHz. The formation of streamer type discharge and Townsend type discharges during tree inception and propagation alters the shape of the tree formed. The UHF signal generated due to partial discharges formed during tree growth were analyzed adopting Ternary plot, which can allow one to classify the shape of tree structure formed.

Development of a Portable XLPE Cable Insulation Detection Device

2014 ◽  
Vol 960-961 ◽  
pp. 881-884
Author(s):  
Xiao Guang Xi ◽  
Yu Yan Man ◽  
Chi Zhang ◽  
Ming Lei Wu ◽  
Yan Wei Dong ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Electromagnetic Wave ◽  
Electromagnetic Coupling ◽  
Partial Discharge ◽  
Power Cables ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Insulation Status

In this article, a portable XLPE cable insulation detection device is introduced. Such a device utilizes electromagnetic coupling, UHF electromagnetic wave and acoustic emission to detect partial discharge signals in power cables. By analyzing the partial discharge signals and cable temperatures, the insulation status of XLPE power cables is judged.

Körperschallemission in CFK und Fräswerkzeugen/Acoustic emission in CFRP and milling tools – Analysis of emitted acoustic emission in analogous experiments

2021 ◽  
Vol 111 (07-08) ◽  
pp. 495-500
Author(s):  
Eckart Uhlmann ◽  
Tobias Holznagel ◽  
Sebastian Ospina Mora
Keyword(s):  
Acoustic Emission ◽  
Tool Wear ◽  
Process Monitoring ◽  
Detailed Examination ◽  
Data Driven ◽  
Material Damage ◽  
Emission Measurement ◽  
Wear Rates ◽  
Milling Tools ◽  
Acoustic Emission Measurement

Herausforderungen bei der spanenden Bearbeitung von CFK sind unerwünschte Materialschädigungen im Bauteil sowie hohe Werkzeugverschleißraten. Für diese Arbeit wurden zerstörende Analogversuche an CFK und diamantbeschichteten Hartmetallproben durchgeführt und die Körperschallmesssignale analysiert. Die eingehende Untersuchung der Messwerte aus den Analogversuchen kann zu einer datengetriebenen Parametrierung einer körperschallbasierten Prozessüberwachung für die Fräsbearbeitung von CFK beitragen.   Challenges in machining CFRP are unwanted material damage in the component and high tool wear rates. For this work, destructive analogy experiments were carried out on CFRP and diamond-coated milling tools while analyzing the acoustic emission measurement signals. The detailed examination of the measured values from the analogy experiment can contribute to a data-driven parameterization of an acoustic emission-based process monitoring for the milling of CFRP.

Acoustic emission measurement using a strain-insensitive fiber Bragg grating sensor under varying load conditions

2009 ◽  
Vol 34 (19) ◽  
pp. 2942 ◽  
Author(s):  
Hiroshi Tsuda ◽  
Eiichi Sato ◽  
Tomio Nakajima ◽  
Hideyuki Nakamura ◽  
Takahiro Arakawa ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Emission Measurement ◽  
Bragg Grating Sensor ◽  
Acoustic Emission Measurement ◽  
Load Conditions
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