Progress on the Vertical Electro-Optical Cable

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Progress on the Vertical Electro-Optical Cable
Progress on the Vertical ElectroOptical Cable
P.Kooijman
UU/UVA/Nikhef
Design criteria
•
•
•
•
•
Low drag
≥11 fibres
Fibre break-out at each floor
Two copper conductors
DC/DC converter incorporated
 Pressure Balanced Oil Filled
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
2
Present design
•
•
•
•
•
Two halves
6.3 mm LDPE tube
12 Draka G.657 single mode Bend Bright fibres
2 AWG18 copper conductors (insulated)
Siemens Midel 7131 oil.
Bottom of
String
Module
Break-out
ElectroOptical cable
DOM
1 fibre
penetrator
2 fibre
penetrator
Break-Out
Box
Marseille 29-31 January 2013
Bottom
Optical Fan-out
Module
11 fibre
penetrator
KM3NeTcollaboration meeting -- Progress
on VEOC
Half
Top Half
3
Break-Out Box (BOB)
VEOC in
VEOC out
Oil filler
hole closed
after VEOC
filled
DC/DC converter
VEOC part
vent
BEOC part
BEOC
O-ring
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
4
BOB in real life
BOB total
Fibre container
with oil filler
Top of Penetrator
BEOC flange
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
5
Penetrator
• Decided to go
with
conventional
nut secured
penetrator
rather than
conical plug
• Main reasons
are for ease
of assembly
• Also plug
turns out to
be quite
fragile
(scratches)
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
6
Penetrator in real life
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
7
Test - 1A
• VEOC had somewhat
different design BOB
• Glue used  Now welded
– Much more reliable and a lot
easier and more pleasant
– Consultant PE welding
• Fibre and Copper routing
same as now.
• No Break out, just BOB
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
8
Assembly of VEOC
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
9
Test at 5000 m
•
•
•
•
Deployed vertically at 5000 m depth in Atlantic
Measured attenuation in fibres
Checked for leaks
Pressure distribution over cable
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
10
5000 m
Test – 1A
• Pressure has effect but....
– One side affected before
submersion
– Test while dismantling boxes
showed return to ~0db when other
container was opened
– Fibres inside containers were
probably pinched and were very
sensitive fibre
– Effect could be mostly reproduced
in the lab
pressure
attanuation [-dB]
-2
-3
-4
-5
-6
Marseille 29-31 January 2013
on depth
tc dry
-6
11
optic channel 1
start
fc wet
from depth
tc dry
fc dry
01/11/2012 19:12
1-11-2012 19:12
1-11-2012 18:00
1-11-2012 16:48
start
1-11-2012 15:36
1-11-2012 14:24
01/11/2012 18:00
01/11/2012 16:48
01/11/2012 15:36
01/11/2012 14:24
01/11/2012 13:12
from depth
-2
-3
-4
-5
KM3NeTcollaboration meeting -- Progress
on VEOC
-7
optic channel 2
press. diff.
1-11-2012 12:00
on depth
1-11-2012 13:12
0
-1
top pressure
1-11-2012 10:48
• The cable survived in tact and did
not leak
• Doesn’t need kit gloves
-1
1-11-2012 8:24
1-11-2012 7:12
tc wet
1-11-2012 6:00
foot pressure
1-11-2012 4:48
0
1-11-2012 9:36
-100
-1
db
-50
01/11/2012 09:36
0
01/11/2012 08:24
0
01/11/2012 07:12
1
01/11/2012 06:00
50
01/11/2012 04:48
2
pressure [kPa]
100
01/11/2012 12:00
150
01/11/2012 10:48
bar
200
Schedule
• At present 3 cables (i.e. 6 halves) are being
prepared for the deployment tests in April
– Two will have only copper for the first mechanical
tests
– One with fibre also and with full breakout to DOM
Spheres
• PPM-DU cable follows
Marseille 29-31 January 2013
KM3NeTcollaboration meeting -- Progress
on VEOC
12

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