The
oil filtering machine is a portable device used for filtering the transformer
oil and switchgear oil. He oil is circulated through filtering plant for several
hours till the desired dielectric strength (above 40kv) of oil and PI (polarisation
index, value, equal or mare than 1.3 desirable) are achieved.
The following
impurities are removed-
·
Dissolved
moisture, free water
·
Solid
particle
The oil filtration plant having
the enlisted component-
·
Degassing
chamber: A
vacuum chamber is provided with special
packed columns to degas the oil. It can be in single or multiple stages.
·
Vacuum
pumping System:
Quality high vacuum pumps and accessories.
·
Filters:
Capable to
size-filter the oil to rated micron size.
·
Heating
system: Tube and
shell constructed, indirect type (heaters placed in protection tubes), gentle
heating exchangers, Division of power in groups with selective thermostatic
controls for larger capacities.
·
Inlet
pump: Vacuum-tight
trouble-free positive displacement gear pump.
·
Outlet
pump: Special
Mono-block/Glandless/Canned Motor/Centrifugal pump.
·
Valves:
Vacuum-tight
manual, automatic and anti-suck back valves.
·
Control
panel:
Centralized control panel with electrical switchgear and an illuminated flow of
diagram.
The temperature of 70 deg.C is
maintained during circulation of oil. The filter plate in the filter unit
removes the solid particles. The heated oil is passed through spray chamber and
vacuum chamber to remove free water particle and the moisture.
Typical filter plant
Flow rate :
200litres/hr
Filtration
Method :
edge type
Performance :
99.6% (efficiency at 1 micron)
Vacuum treatment
Normal vacuum pump performance : 10torr (in vacuum chamber)
Optional start up made : 50 torr
Vacuum pump capacity : 6m/hr
Vacuum degassing performances
Moisture –single pass 100ppm→20ppm
Triple pass 100ppm→10ppm
Gas –single pass 100%ppm→1%ppm
Triple pass 10%ppm→<1%ppm
Control parameter
Instrumentation : pressure/temperature /vacuum
Automatic switching :
high level, low level
Input power
Power supply : 240V AC, 50htz, single phase, 32A
Power : 6.15 KW
Auxiliaries
Inlet hose : 6m
Outlet hose : 6m
Power cable : 12m, 2CX6sqmm copper or 2Cx10 sqmm AL,
earth wire separate cu, 2.5 sqmm.
Dimension and weight
Overall dimension 700x600x1280 mm
Weight 160 kg (dry)
The proper treatment and upgrading of the insulating fluid such as transformer oil will result in the improvement of the properties of the entire insulating media of power transformers.
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