Maxei Oil Vacuuming [PDF]

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I–BETH15GB_0



OIL TREATMENT ARRAS MAXEI



page 1/5



TYPE MAS 12000-1140



TECHNICAL DESCRIPTION OF THE STANDARD OIL TREATMENT PLANTS



TYPE MAS 12000 140kW 1000m3/h PREAMBLE



SUMMARY: Principle of operation



2



Main characteristics



2



Components of the plant



2



Description of the plant



3



Operating diagram



4



Optional features



5



The use with confidence of the dielectric fluids in the transformers, circuit breakers, and other types of electrical equipment depends upon some of their basic characteristics, which can affect the general operating efficiency of the electrical equipment. In order to ensure manifold functions such as an insulant, a coolant and an extinguishing medium, these dielectric fluids must have some basic properties, and especially a high dielectric strength. Now, in service, the dielectric fluids properties may be affected by the appearing of oxidation, condensation and other contaminants such as water, solid impurities and dissolved gases. Working on the principles of filtration,



dehydration and vacuum degasification, “MAXEI Industries Electriques” oil treatment plants are particularly recommended to maintain, dry and fill your transformers and circuitbreakers. By removing the impurities, dissolved moisture and gases, they indeed enable to restore the oil dielectric properties and to extend the useful life of your electrical equipment. Used and well-known all over the world for their performance, reliability and ease of operation, our standard plants are now enriched with our latest technological achievements. Automated, fitted with remote control or telecontrol systems, our oil treatment plants are more and more autonomous, which insure you increased productivity.



MAS 12000 on road trailer With metallic cover



Oil treatment 1000



100



mbars



of the oil will be in excess of 75 kV after treatment. An oil at 20 ppm will go out at 3 ppm* after 1 pass. The above figures are reached with oils having a 10-2 mbar distillation curve at a temperature of 80° C.



Comparison betwenn vapor and liquid phases of moisture and dielectric oil EAU Lliquid water



HUILE Liquid oil



10



Vapor water 1



Vapor oil



0,1



Evolution of the moisture content and of the dielectric diélectric



80



10 Moisture content



20



5



0



0



120



100



80



60



40



20



0



20 15



60 40



0,01



PPM of water



100



KV



The oil treatment plants ARRAS MAXEI has been designed to treat dielectric oil having a 50 ppm moisture content and a dissolved gas content of approx. 10% by volume before being treated. After getting the optimal treatment conditions, the clean treated oil goes out after 1 pass at a maximum temperature of 70°C with a moisture content below 5 ppm* and a dissolved gas content of approximately 0,1% by volume*. The breakdown voltage



T °C



* : Theoretical values depending on the measuring device accuracy and ranging from 2 to 5 ppm



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OIL TREATMENT ARRAS MAXEI



TYPE MAS 12000-1140



Principle of operation Options Road trailer Low speed trailer



Options Plant with metallic cover Plant with tarpaulin



The dielectric fluid enters in the plant through an inlet strainer, and then passes through an inlet oil pump and into an oil heater, where it is heated by immersion heaters. After a fine filtration on cartridge, the dielectric fluid is sprayed into a vacuum chamber on a basket of « Raschig » rings. Finally, after the contaminants are eliminated, the clean treated fluid flows through the outlet oil pump.



Options



Main characteristics



Foam regulation system



Nominal flow* during treatment in l/h



12000



Heating power in kW



140



Total power in kW



169



Filtration** by cartridges in nominal µm Limit vacuum against closed suction in mbars Options Transformer insulating system High level detection system



Vacuum during treatment in mbars



1 0,05 0,5 to 2



* : Approximate values. ** : Consumable cartridge with filtration expressed in µm nominal. All our plants are equipped in standard with tropicalized electrical material, for a feeding tension 400 Volts 3 phases 50 Hz and auxiliary operation in 220 Volts by transformer.



Components of the plant Options Voltmeter / Ampere meter



Options Telecontrol



1 1 1 1 1 1 1 1 1 3



inlet oil motor-pump direct electrical heater with 3 working temperatures cartridge filter dehydration tank outlet oil vacuum motor-pump double-staged vacuum motor-pump set measuring, controlling, alarming, and regulating apparatus control panel set of pipes, valves and accessories lifting rings placed on upper part of the of the degasification unit



The standard plant is installed on a section iron plate with retention tray and maintenance wheels.



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OIL TREATMENT ARRAS MAXEI



TYPE MAS 12000-1140



Description of the plant Heater and oil filtering system. Maxi flow of the pump in l/h Pump type



15000 Centrifugal



Height of discharge in mCE



40



Motor power in kW



7,5



Pump building



1) Inlet oil motor-pump The oil inlet suction of the ARRAS MAXEI standard oil treatment plants are equipped with a symmetrical connection (like French fire system), a strainer filter, an insulation valve, an inlet oil motor-pump and an oil sampling valve also serving as an heater drain.



Cast iron/steel



Rotation speed in rpm



1500



Connection diameter in mm



65



Total heating power in kW



140



Number of thermodippers



2



Power of an element kW



70



Auxiliary heating connection



65



Number of filters



2



Number of cartridges



12



Filter building



Cast iron/steel



Clogging control



2) Heater The motor-pump outlet of the standard ARRAS MAXEI oil treatment plants are equipped with a heater made of pipe stub heating casing, equipped with flanged immersion heater. This heater has two working temperature. The heater outlet is equipped with a safety valve adjusted at 4 bars, an overheating safety thermostat, a temperature regulation probe PT100, a heater by-pass, a pressostat and a manometer -1 / +5 bars. 3) Filtering system The standard ARRAS MAXEI oil treatment plants are equipped with two consumable cartridge filter with 1 µm nominal filtration. The filters, equipped of a clogging control, are connected to the dehydration tank.



Pressostat



Flow of primary pump in m3/h



240



Limit vacuum in mbar



0,08



Motor power in kW



5.5



Rotation speed in rpm



1450



Oil capacity in litre



8,5 3



Flow of roots pump in m /h Roots motor power in kW Rotation speed in rpm Oil capacity in litre Cooling system power in kW 2



1000 4



3,5 4 6



Vacuum measure



Pirani



Auxiliary vacuum connection



80



Maxi flow of the pump in l/h



10000 Centrifugal



Height of discharge in mCE



40



Motor power in kW



5,5



Rotation speed in rpm Pump building Connection diameter in mm



4) Dehydration tank The standard ARRAS MAXEI oil treatment plants are equipped with a cylindrical steel dehydration cell. It includes a spraying blockhead and a basket of dehydration rings. The upper part of the cell is equipped with an inlet oil connection, a connection to the vacuum pump, a vacuum indicator 1000 to 0 mbar and a vacuum regulation valve. The collar is equipped with a level sensor, a low tension headlight window to look at the lower part of the cell and a foam regulation system. The lower part is equipped with a flow regulation tube and a draining valve.



3000



Condenser in m



Pump type



Oil degazing under vacuum.



1500 Cast iron/bronze 65



5) Vacuum motor-pump The standard ARRAS MAXEI oil treatment plants are equipped with a double-staged group composed of a pump with pales, greasing through oil circulation with filter, antireturn valve, air ballast and a roots pump. The group is connected to the dehydration cell by a pipe equipped with a safety valve, an insulating valve, a Pirani vacuum gauge with display and an exhaust electro-valve of the group. The pumping group is equipped of a condenser and a cooling system for an optimal protection of the primary pump.



Oil outlet. 6) Outlet oil vacuum motor-pump The outlet discharge of the standard oil treatment plants are equipped with an outlet oil vacuum motor-pump, a valve of oil sampling, a manometer, a pressostat, an anti-return valve, an insulation valve and a symmetrical connection (like French fire system).



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TYPE MAS 12000-1140



OIL TREATMENT ARRAS MAXEI



7) Control panel The standard ARRAS MAXEI oil treatment plants are equipped with an industrial water proof type cabinet in painted steel, with contactors, relays, fuses, connectors and wires necessar for the equipment running. On the door, there’s the buttons and warning lights of the different equipment components. 8) Finishing painting The standard oil treatment plants ARRAS MAXEI are painted in white (RAL9002) for the system and in blue (RAL 5012) for the platform. 9) Dimensions Length in Width in High in mm mm mm Plant on platform



Weight in kg



Not proposed



Plant on skid



4500



2100



2580



4500



Plant on cart



4500**



2100



2960



5300



Plant on cart with tarpaulin



4500**



2100



3210



5500



Plant on cart with metallic cover



4500**



2100



3210



6000



Plant on road trailer with tarpaulin



4500**



2100



3480



8000*



Plant on road trailer with metallic cover



4500**



2100



3480



8000*



All characteristics may be modified without any prior notice.



* : The weight is not higher for the road trailers equipped with tarpaulin or metallic cover ** : The lengths are given without the draw bar



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OIL TREATMENT ARRAS MAXEI



TYPE MAS 12000-1140



Optional features Process controls



1) INSULATING SYSTEM This option enables, in case of incident or any sudden treatment stopping (power cut), to insulate the plant from the electric appliance to be treated and thus to prevent from dangerous oil flowing into the oil treatment plant. 2) HIGH LEVEL DETECTION SYSTEM This option enables the automatic stop of the plant, when the valve, which protects the vacuum pump, is full. This reinforced safety and avoids the transfer of the condensates in the vacuum pump. 3) AUTOMATIC DRAINING OF THE VALVE This option enables an optimal protection of the vacuum network of the plant. 4) VOLTMETER / AMPERE METER This option will enable you to visualize the feeding tension of the plant as well as the developed intensity in order to protect the network and the equipment. 5) RECORDER This option ables to record the physical dimensions, characterizing the degazing process, like the temperature and the vacuum. 6) QUALITY CONTROL OF OILS



The presentations



1) CART The oil treatment can be installed on a cart with full tyres (maxi speed : 20 km/h). 2) ROAD TRAILER The oil treatment plant can be installed on a road trailer. The trailer can be equipped with rear lights in accordance with the EU regulations of road code. The whole installation is commissioned by the French government vehicle testing service to be allowed to circulate in France and European countries. 3) TARPAULIN PROTECTION The plant can be equipped with a protection type tarpaulin, which protects it from the bad weather. The tarpaulin can be opened on the four side panels to enable the access to all the components of the plant. 4) METALLIC COVER PROTECTION The plant can be equipped with a metallic cover type protection, which protects it from the bad weather. It is made of aluminium with a frame made of iron steel. The side panels opens horizontally, closing per key and are maintained thanks to gas jacks. The panels enable the access to the components of the plant.



The transformers drying (The vacuum technology)



1) TRANSFORMER DRYING This option enables to make vacuum in the transformer in order to dry the active parts while the oil is treated. The pump is installed parallel to the first one to increase the pumping capacity of the plant. 2) DOUBLE STAGE PUMPING GROUP In case of this option, the primary vacuum pump mounted on the plant is completed with a second pump stage composed of a roots. 3) AUXILIARY VACUUM CONNECTION This option enables to have an additional vacuum connection on the plant. 4) CONDENSOR AND COOLING GROUP This option enables an optimal protection of the pump group in case of high water content treatment.



The transformers drying



(Oil heating and transfer)



1) TRANSFER PUMP This option enables to increase the hoses length between the plant and the transformer. 2) HIGHER HEATING POWER The standard heating power of the ARRAS MAXEI oil treatment plants has been calculated for a weight ratio between oil and transformer about 4. In case of a higher ratio, we recommend to increase the heating power of the plant. 3) AUXILIARY HEATING CONNECTION This option enables to have an additional heating connection. It allows to heat the transformer per oil circulation through the plant heater. 4) SAFETY LEVEL ON TRANSFORMER This option is installed on the upper part of the transformer to control the variations of the oil level in this one. 5) CONNEXION FEATURES AND ACCESSORIES 6) PULVERIZATION



Telecontrol



TELECONTROL standard or GSM