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Transformer
Dryout Systems
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VACUUM DRY-OUT UNIT
On-line Vacuum
Dry-out units allow drying of transformer windings while the
transformer remains in normal service. Maintaining low
moisture levels in the cellulose ensures the transformer is
less likely to fail due to shock loadings, such as lightning
or through faults, and insulation material is not degraded
through chemical reaction with moisture.
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ESI operates a
Transformer Oil PCB Dechlorination and Recycling Facility in
the ACT as well as an itinerant service in some Australian
States and Overseas.
All plant operations are operated via a computer
controlled SCADA system which ensures |
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maximum protection to the Operator and
Environment and that the integrity of the oil
properties are maintained
throughout the entire process. As fully licensed PCB Waste
Transport Operators, ESI can provide a one-stop oil exchange
service utilising our dedicated tanker, filtration and vacuum
filling equipment operated by specialist staff.
ESI own the exclusive
rights to Velcon Transformer Oil Filter Technology in
Australia. Over the past few years ESI have developed small
portable transformer drying systems utilising Velcon’s
Superdri dissolved moisture removal cartridges to dry the
transformer cores
online. |
The advantages of
this system includes:
a) The transformer can be left in the
service during the entire operation
b) No mechanical
stresses are imposed on the insulation or tank
c) Core
shrinkage is minimised as water is replaced by dry oil on
removal
d) Drying is gradual and can be monitored through
on-board
metering |
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The following
results illustrate the benefits of our
regeneration.
Customer: North Power New Zealand Hikurangi
Zone Sub.
Transformer
contained approxiamately 8000 litres of oil. |
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The transformer
was firstly reclaimed by our Fullers Earth plant for
full acid removal, degas and dehydrate oil defore
installing Velcon Dry Out plant.
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Date |
Moisture ppm |
Oil temp bottom |
%M/dw |
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Before Dry Out |
1.12.1998 |
45 |
46degC |
1.8 |
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After Dry Out |
27.2.1999 |
12 |
40degC |
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Further Tests |
3.3.1999 |
11 |
40degC |
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13.4.1999 |
13 |
40degC |
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25.6.1999 |
12 |
40degC |
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18.7.1999 |
12 |
40degC |
0.6 | |
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See the Articles page for
"Field Trial of Vacuum
Dry-out" |
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