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
Method : edge type
Performance : 99.6% (efficiency at 1 micron)
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
Instrumentation : pressure/temperature /vacuum
Automatic switching : high level, low level
Power supply : 240V AC, 50htz, single phase, 32A
Power : 6.15 KW
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)