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KONDIC Oil Filtration

TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 1
TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 2
TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 1
TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 2
TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 1
TRANSFORMER OIL FILTERING UNIT - S 3000 vario - KONDIC Oil Filtration - 2


Adjustable oil flow rate 900 - 3000 l/h
Maximal oil flow rate 3000 l/h
Heating capacity 2 x 22,5 (45) kW
Adjustable oil temperature range 0 °C – 90 °C
Differential temperature (inlet/outlet) approx. 28 °C
Minimal oil inlet temperature 5 °C
Vacuum pump capacity 63 m3/h
Filter fineness 3 microns
Total power cca. 48 kW
Final oil qualities, after three passes:
- water content ≤ 2 ppm
- gas content 0.03 % Vol
Operating pressure in degassing tank 2 - 9 mbar
Unit, size 2000x1200x2100 mm
Unit, weight approx. 700 kg

The Unit is delivered ready for operation, together with:
- control panel, wiring and two connecting hoses for oil (each 5 m long) and safety devices that provide maximal
safety during the operation;
- specially designed degassing system that provides equal distribution of treated oil in the low-pressure
environment to attain maximal treatment results;
- spare set of 3 micron filter cartiges;
- spare heating element

The Unit S3000 is designed for filtering, drying and degassing of transformer oil. The model and the example that
were kept in mind during development and construction of this Unit were the units, which proved to be most
efficient in operation, built by leading European manufacturers. All essential parts of the Unit (vacuum pump, gear
pump, electromagnetic valve and floater) are produced by leading German manufacturers. Some of the
components (such as fine and coarse filters, temperature control, construction of the heaters, gear pump) had to
be modified to improve the operation of the Unit and to eliminate shortcomings noticed in the operation of some
other units of this kind.

The electrical properties of insulating oil (such as puncture voltage and coefficient of losses) can be considerably
improved by its filtering, degassing and dehydration. Only properly and sufficiently filtered and dried oil is suitable
for filling up of the transformer. Even brand-new oil is rarely clean enough to be used in high-voltage installations,
as it is often already polluted in the transporting barrels and it may absorb too much moisture in contact with air.
During its operation, transformer-insulating oil is absorbing moisture over its free surface in the expansion vessel
and it becomes polluted by absorbing dirty particles, fibers, soot and aging products. Therefore, oil conditioning
has to eliminate the following:
- solid particles
- free and dissolved water
- dissolved gasses
The puncture voltage can be considerably increased and the coefficient of loses tangδ improved by filtering,
degassing and dehydration of insulating oil to the extent depending on moisture content.

1. Inlet valve a spherical valve with special “Teflon” gaskets
2. Coarse filter as oil is often very polluted, the Unit is fitted with a large sized, easy to open and clean, coarse
filter. Oil is conveyed at a reduced flow rate around a strong permanent magnet which retains steel particles and
protects the gear pump from damages
2a. Service valve a spherical valve 1“ with special “Teflon” gaskets for maintenance and cleaning of coarse filter
3. Oil heater 45 kW power of the heater is divided into two stages, each of 22,5 kW. Oil is heated indirectly by
means of electric heating elements insulated from oil by pipes and air. The heating process is thereby gradually
accomplished and, with the sufficiently large heating surface, any damage of oil is excluded. In addition, for each
heating stage there is one 3.75 kW heater in each of the six (twelve in total) heating pipes. Together with the
thermal control (details of which are given in the following text) this allows heating of oil in individual stages, e.g.
at higher temperatures quite “tenderly”
4. Safety valve prevents increase of pressure in case oil is overheated
5. Safety thermostat the Unit is equipped with a precise thermostat This safety thermostat is designed to allow
max. temperature of 900C, with a construction that allows it both safety and control role. By means of other
thermostat (at the thermometer), temperature at the both heating stages can be controlled
6. Control thermostats Control thermostat is integrated inside the thermometer and is equipped with sliding
limiters for temperature regulation. These sliders could be adjusted by taking of of the thermometer’s protective
glass. Control thermostat should be adjusted to cca. 60-65 °C which represents an optimal temperature for oil
7. Thermometer measures the temperature at the outlet of the oil heater
8. Electromagnetic valve a special magnetic valve capable of operating in vacuum, resistant to transformer oil
and high temperatures. Together with the floater, it controls the oil level in degassing tank
9. Degassing tank of a welded construction, with specially shaped separating sheets for equal distribution of oil.
Oil is conveyed over the sheets, where oil surface is significantly increased and gas fractions can be efficiently
separated. In addition, the resting time of oil is increased to the maximum. The degassing tank is equipped with a
sight-glass for the visual control of the process, as well as with a special search-light for illumination of the tank
interior. For safety reasons, the power supply of the search-light is 12 V
10. Floater this floater, as essential control equipment, i procured from well-known European manufacturer. It
protects the degassing tank from overfilling and, together with electromagnetic valve, prevents the insulating oil to
penetrate into the vacuum pump
11. Gear pump with maximum of 3000 l/h capacity. The capacity of the oil flow can be adjusted via frequency
regulator installed at the control panel. Adjustable capacity is from 900 – 3000 l/h. This pump is specially
designed to operate under vacuum conditions
12. Overflow valve protects the Unit from an excessive rise of pressure in case outlet valve is negligently closed or
because of some other reason
13. Mano-vacuummeter for reading of fine filter dirtiness, through oil pressure rise. Filter should be cleaned when
the pressure rises up to 2.5 bar
14. Valve a spherical, closing valve for insulating oil sampling
15. Fine filter container the fine filter container is of a size that allows it to accept a standard filter separating
particles of 3-5 microns
16. Outlet valve a spherical valve with special “Teflon” gaskets
17. Air valve a spherical valve for aeration of the degassing tank in case of an excessive foaming of oil
18. Sight-glass for process control equipped with search-light fitted on its right side to illuminate the interior of the
degassing tank
19. Vacuum meter measures vacuum in the degassing tank
20. Discharge valve a spherical valve discharging condensate from the separator
21. Separator of a special construction for separation of liquid fractions from gasses which are extracted out of
degassing tank. It is equipped with sight-glass for control of separated water
22. Control panel consisting of fuses, contactors, electric motor electrical protection, relays, transformer, main
switch, internal wiring etc., for an automatic operation of the Unit
23. Vacuum pump of 63 m3/h capacity, provides vacuum for operation of the Unit. It is equipped with a socalled
“gas-ballast” valve. Maximal vacuum that could be achieved with this pump is 0.1 mbar
24. Drainage valve a spherical valve for drainage of transformer oil from degassing tank and oil heater
25. Framework a welded, sectional steel construction, which represents foundation for all described components
of the Unit
26. Electric equipment consisting of driving motors for the gear and vacuum pump and of internal wiring of the
Unit. Suitable for three-phase, 50 Hz power supply

27. Two flexible hoses suction and discharge (5/4”) hoses are specially designed, suitable for operation under
vacuum and with oil. Each hose is 5 m long
28. Rollers for base frame comprising of 4 swivelling rollers, 2 of which are equipped with locking device
29. Oil tub oil retaining tub in case of oil leakage. It is placed under the complete Unit with a purpose of preventing
environmental accidents and spillage of oil into the surroundings.
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