Electrical Tree Growth Structural Analysis of XLPE Cable Insulation under Different AC Voltage

2021 ◽  
Author(s):  
Rakesh Sahoo ◽  
Subrata Karmakar
Keyword(s):  
Structural Analysis ◽  
Tree Growth ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Electrical Tree

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.

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