tardograda mogwai induced subterranean insulation decomposition
TRANSCRIPT
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Tardograda Mogwai Induced Subterranean Insulation Decomposition
Dr. Ambrose TurdickinUniversity of Pylmoth
April 1, 2014
University of Plymoth
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Tardograda Mogwai
• First reported by the RAF during WW II in India
• Rapid growth of failures followed introduction of Styrene Butadiene Rubber in RAF magnetron based radar systems.
• Research strain collected in 1944
Photo Credit Dr. T. Staiano Metro Engineering Consulting Consortium Associates
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Mogwai Consumption of Other Insulations
• WWII research correalted Mogwai consumption of SBR insulations
• Stufing and Poupmkin observed consumption of Neoprene and Lead in 1994
EPR XLPE PE Lead Neoprene SBR0
10
20
30
40
50
60
70
80
90
100
*
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Connecting the Dots
• We know that Mogwai will consume many types of cable insulation
• Original behavior observed around high frequency cables
• What attracts them to low voltage cable?
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Tardograda Mogwai and Cable
• Early studies showed Mogwai positive correlation between consumption and frequency, Mayflower et al.
• Large networks have resonant frequencies of less than .001 Hz
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Frequency Response
• Mayflower focused on aircraft issues
• Above 400 Hz• New research
examined response down to DC (0 Hz) to understand impact on HVDC Systems
Frequency (log)
Cons
umpti
on
1.21 GHz1 uHz
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The Termite Connection
SBR Insulation Cellulose Wood Products
Mogwai Moultus0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
90.00%
100.00%• Cellulose is the mainstay of the Isoptera
• Evolved around decomposition around wood
• Mogwai moltus is nearly 90% cellulose