Depth purifying and drying of solid insulation ON LOAD Transformer oil reclamation / regeneration On-site On-load On-line No oil vacuuming, no oil heating

1.  Treatment of both liquid and solid
insulation in the same process
 On Load process while power
transformer is energized
 Long lasting insulation characteristics
 Guaranteed results at least one year
after treatment
 Power transformer lifetime extension
 Non-Invasive technology
 Environmentally friendly
 No oil overheating
 No oil vacuuming
 Low pressure oil circulation
VIMAP R2000 ON LOAD
ON LOAD REVITALIZATION OF POWER
TRANSFORMERS INSULATION SYSTEM
 Revitalization of Oil-Paper Insulation System
 Regeneration of Insulation Oil
 Dehydration of Oil-Paper Insulation
 Dehydration of Insulation Oil

2. ................ VIMAP R2000 ON LOAD
................
VIMAP R2000 ON LOAD
Revitalization of oil-paper insulating system
Revitalization of power transformer insulation includes the following:
 PHYSICAL-CHEMICAL REGENERATION OF INSULATING OIL
Reclamation/ restoration of all insulating oil characteristics
 DEPTH PURFICATION AND DEHYDRATION OF SOLID INSULATION
Water and all ageing products are polar compounds and are adsorbed
by VIMAP adsorbents. Phenomenon of diffusion is used to ensure
depth purification and drying of solid insulation. By constant removal
of all polar compounds from insulating oil, non-equilibrium between
solid and liquid insulation is maintained. It ensures migration of polar
compounds from cellulose to oil.
Constant maintenance of this non-equilibrium by purification and
drying of insulating oil ensure migration of polar compounds from
solid to liquid insulation, i.e. provide depth purification and drying of
solid insulation.
GUARANTEED INSULATION CHARACTERISTCS AFTER
TREATMENT AND WITHIN WARANTY PERIOD OF MIN. 12
MONTHS
Depending on the condition of the insulation condition and customer demands, it
is usually guaranteed that the characteristics of insulating oil after 12 months will
be within the limits defined by the specification of IEC 60422, Table 3 (new oil in
the new transformer, before energizing).
RECOMMENDED LIMITS FOR MINERAL INSULATING OILS AFTER INITIAL FILLING OF
ELECTRIC EQUIPMENT, BEFORE ENERGIZATION- IEC 60442:2005, TABLE 3.
TEST
LIMITS
VOLTAGE (HV), kV
< 72.5 72.5 do 170 > 170
Breakdown Voltage (kV/cm) > 220 > 260 > 260
Water Content (mg/g) < 20 < 10 < 10
Neutralisation Number (mgKOH/g) < 0.03 < 0.03 < 0.03
Interfacial Tension (mN/m) > 35 > 35 > 35
Dielectric Disipation Number - tgδ < 0.015 < 0.015 < 0.010
Oxidation Stability According IEC60296 (for unused oils)
Particles (ISO 4406) - - 9/6 to 10/7
VIMAP R2000 On-load Revitalization
400/121/22 kV, 250 MVA, Bacau Sud, Romanian power grid company, 2010
 tg δ of total insulation
 Insulation resistance
 Water content in solid
insulation
 tg δ of insulating oil
 Neutralization/Acid number
 Interfacial tension
 Dielectric strength
 Water content in insulating oil
 Particles
Regenerated
oil as good as
unused
VIMAP R2000
adsorption columns
Remain adsorbed:
- Oxidation products
- Water
Extracting from
oil-cellulose insulation:
- Oxidation products
- Water
Polar compounds
migrate from
cellulose to oilat
Adsorption of
polar compounds
from insluating
oil

3. VIMAP R2000 ON LOAD ................
................
Criteria which define right moment for insulation revitalization
Revitalization at appropriate time insures maximum power transformer lifetime increase and its
reliability on the network. Since cellulose depolimerization is irreversible process, late
revitalization has limited results. Depending on the moment when revitalization is done, power
transformer lifetime could be prolonged from 10 to 25 years.
Based on our experience and according to IEC, IEEE and other international regulations and
standards, following insulation characteristics border values are recommended when revitalization
should take place.
CHARACTERISTIC UNIT
VOLTAGE (LV)
≤ 72.5 72.5-170 170-400 ≥ 400
Water content in solid insulation (20°C) % Max. 2.5 2.5 2.0 2.0
Water content in oil (20°C) ppm Max. 15 15 15 10
Dielectric Strength kV/cm Min. 200 200 200 220
Total Neutralization (acid ) number (TAN) mgKOH/g Max. 0.15 0.10 0.10 0.10
Interfacial Tension (IT) mN/m Min. 25 25 30 32
Dielectric dissipation number (tgδ) 90°C -3
x 10
Max. 60 60 60 60
IT/TAN - Min. 166 250 300 320
Degree of cellulose polimerisation (DP) - Min. 600 600 600 600
Year change DP (Δ DP) * - 50 50 40 30
Our Technology
VIMAP Technology is based on use of synthetic
adsorbents which main characteristic is high
capacity in adsorption of all polar molecules,
which occur as a result of oil and cellulose
degradation process.
Granulated synthetic adsorbents attract water,
acids, peroxides, furans, furaldehydes, ketones
etc. and permanently hold them on active
surface in their pores.
Operation principle is very simple- insulating oil
continually circulates from power transformers
through columns with synthetic adsorbent
where polar molecules are trapped.
Unlike other technologies that are very
demanding and require oil vacuuming and oil
overheating, our technology allows us to
perform treatment while transformer is
energized, because none special condition is
required,
Because of that our equipment can be used for
the purpose of preventive maintenance, which
is achieved by continuous on-load treatment of
insulation oil.
Saturated adsorbents can be reactivated
hundreds of times till full oxidation, in the
REACT2000 process, resulting in in only two
combustion products- CO2 and H2O, which are
harmless for environment.
Since all VIMAP processes of oil and paper
insulation system treatments as described
above are free of exhaust gases therefore we
can conclude that VIMAP technology is virtual
100% clean in complete, making it
environmentally most friendly of all
technologies available nowadays.
Modular configuration of columns with
adsorbents is enabled in order to optimize the
size of our machinery and reaction speed of
adsorbent with oil and to rationalize adsorbent
change intervals.
ADVANTAGES OF VIMAP R2000 TECHNOLOGY
COMPARING TO OIL REPLACEMENT
 No new oil required
 Ressource friendly
 Depth cellulose insulation purification
 Depth cellulose dehydration
 Long term stability of revitalized oil
 Transformer continuously filled with oil
 Transformer continuously in operation
 Simple equipment connection
 No waste oil
 Cleaning of active part
 Long period gurantees on achieved results
COMPARING WITH CLASSIC TREATMENTS AND FACTORY REPAIR
(oil spray, thermo-vacuum, natural adsorbents):
 On Load operation
 Non-invasive process
 No oil overheating
 No power transformer vacuuming
 Long lasting results
 Extension of power transformer lifetime
 Increased power transformer reliability on the network
 Simplicity in operation
 Environmentaly friendly technology
 No disposal of waste oil
 Long period gurantees on achieved results

4. ................ VIMAP R2000 ON LOAD
TOTAL INSULATION
REVITALIZATION
Device for dehydration of insulating oil
Device for on-load dehydration of oil-cellulose insualting system
Equipment for continual revitalization of oil-cellulose insulating system
Equipment for continual dehydration of oil-cellulose insulating system VIMAP
Mobile plant for reactivation of synthetic adsorbents
................
1000
900
800
700
600
500
400
300
200
100
0
Revitalization
Lifetime
Extention
0 10 20 30 40 50
Non-Revitalized
Insulation Aging
Revitalized
Insulation Aging
Degree of De-Polimerization (DP)
Transformer Lifetime (Years)
DP valued of 150-
200 indicates end of
transformer
lifetime
Source: ABB
- POWER TRANSFORMER LIFETIME
EXTENTION
- INCREASED OPERATION
RELIABILITY ON THE NETWORK
Our products:
 VIMAP PORTABLE
 VIMAP IDEH PORTABLE
 VIMAP RCIM
 VIMAP RCID
 VRA2000
 SYNTHETIC ADSORBENTS
VIMAP D.O.O.
Derived technologies from VIMAP R2000:
 VIMAP OREG2000
Technology Transfer
We offer complete transfer of our technology, products
and ’’know-how’’
Brace Jerkovic 137, 11000 Belgrade, Serbia
tel.: +381 63 257853, fax: +381 11 24 69 724
Dehydration of Oil-Cellulose Insulating System
office@vimap-technics.com, www.vimap-technics.com
SLOWING DOWN CELLULOSE
AGEING
Power Transformer Lifetime is Defined by the Lifetime of Cellulose
Power transformer lifetime could be extended for more than 15 years depending on treatment timing
Regeneration of Insulating Oil
 VIMAP IDEH2000
 VIMAP ODEH2000
Dehydration of Insulating Oil
Differences Between Transformer Insulation System Treatments
 Dehydration of Insulation Oil
It is the most basic treatment of transformers and it includes removal of water
from oil only. Problem with this process is that results achieved do not last for
long time. Since more than 95% of water in power transformer is located in
cellulose, soon after oil dehydration is finished water from cellulose starts to
migrate back to the oil, resulting in the same water content in oil few months
later as it was before.
 Dehydration of Oil-Paper Insulation System
This process includes dehydration of both oil and cellulose. Results after
treatment remain for a long time in terms of water content but other aging
products in oil-cellulose insulation system remain unaffected.
Problem is that it takes much more time to dehydrate cellulose then oil.
Therefore many invasive and complicated technologies are not suitable for this
treatment as they often require long lasting transformer shutdown which is not
acceptable for transformers owners.
Synthetic adsorbent based technologies permit on-load treatments while the
transformer is in operation.
 Regeneration of Insulation Oil
This process consists of removal of all oxidation products from the oil.
The same as insulation oil dehydration results of this process are temporary
because soon after oil regeneration, water and oxidation products (polar
molecules) start to migrate from cellulose back to the oil.
Insulating oil regeneration can be performed by synthetic adsorbents only or in
combination of natural adsorbents with some other dehydration technology.
 Revitalization of Oil-Paper Insulation System
This is the most complex process of all others and includes water and all polar
compound removal from oil-paper insulating system. Process consists of oil
dehydration and regeneration and at the same time cellulose dehydration and
depth purification.
Only after this treatment it is possible to give guarantees for achieved results for
a few years and to significantly prolong power transformer lifetime. After such
treatment oil quality should be acc. to IEC 60422, table 3. (recommended limits
for mineral insulating oils after initial filling of electric equipment, before
energizing).