I BETH8GB_A page 1/5 TECHNICAL DESCRIPTION OF THE STANDARD PLANTS PREAMBLE SUMMARY: Principle of operation Main characteristics Components of the plant 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 recoended 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 6 on road trailer with metallic cover Oil treatment Comparison betwenn vapor and liquid phases of moisture and dielectric oil EAU Lliquid water HUILE mbars of the oil will be in excess of 75 kv after treatment. An oil at ppm will go out at 3 ppm* after 1 pass. The above figures are reached with oils having a 1- mbar distillation curve at a temperature of 8 C. Liquid oil 1 Vapor water 1 Vapor oil,1 Evolution of the moisture content and of the dielectric diélectric 8 1 Moisture content Ten 5 1 8 6 4 15 6 4,1 PPM of water KV The oil treatment plants ARRAS MAXEI has been designed to treat dielectric oil having a 5 ppm moisture content and a dissolved gas content of approx. 1% 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 7 C with a moisture content below 5 ppm* and a dissolved gas content of approximately,1% by volume*. The breakdown voltage T C * : Theoretical values depending on the measuring device accuracy and ranging from to 5 ppm
I BETH8GB_A page /5 Principle of operation Road trailer Low speed trailer 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 iersion 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. Foam regulation system Transformer insulating system High level detection system Main characteristics Nominal flow* during treatment in l/h 4 Heating power in kw 64 Total power in kw 73 Filtration** by cartridges in nominal µm 1 Limit vacuum against closed suction in mbars,8 Vacuum during treatment in mbars,5 to * : 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 4 Volts 3 phases 5 Hz and auxiliary operation in Volts by transformer. Components of the plant Voltmeter / Ampere meter Telecontrol 1 inlet oil motor-pump 1 direct electrical heater with working temperatures 1 cartridge filter 1 dehydration tank 1 outlet oil vacuum motor-pump 1 single-staged vacuum motor-pump 1 set measuring, controlling, alarming, and regulating apparatus 1 control panel 1 set of pipes, valves and accessories 4 lifting rings placed on the plant The standard plant is installed on a section iron plate with retention tray and maintenance wheels.
I BETH8GB_A page 3/5 Description of the plant Maxi flow of the pump in l/h 5 Pump type Auto energizing Height of discharge in mce 55 Motor power in kw, 1) Inlet oil motor-pump The oil inlet suction of the standard oil treatment plants are equipped with a syetrical 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. Pump building Cast iron/steel Rotation speed in rpm 15 Connection diameter in 4 Total heating power in kw 64 Number of thermodippers 8 Power of an element kw 7,8 Auxiliary heating connection 4 Number of cartridges 6 Filter building Cast iron/steel Clogging control Pressostat ) Heater The motor-pump outlet of the standard oil treatment plants are equipped with a heater made of pipe stub heating casing, equipped with flanged iersion 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 PT, a heater by-pass and a manometer -1 / +5 bars. 3) Filtering system The standard oil treatment plants are equipped with a consumable cartridge filter with 1 µm nominal filtration. The filter, equipped of a clogging control, is connected to the dehydration tank. Oil degazing under vacuum. Flow in m 3 /h 17 Limit vacuum in mbar,8 Motor power in kw 4 Rotation speed in rpm 145 Oil capacity in litre 5 Vacuum measure Pirani Auxiliary vacuum connection 5 4) Dehydration tank The standard 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 to 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. 5) Vacuum motor-pump The standard oil treatment plants are equipped with a single-staged group composed of a pump with pales, greasing through oil circulation with filter, antireturn valve and air ballast. 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. Maxi flow of the pump in l/h 7 Pump type Centrifugal Height of discharge in mce 4 Motor power in kw 3 Rotation speed in rpm 15 Pump building Cast iron/bronze 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, an anti-return valve, an insulation valve and a syetrical connection (like French fire system). Connection diameter in 4
I BETH8GB_A page 4/5 7) Control panel The standard 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 are painted in white (RAL9) for the system and in blue (RAL 51) for the platform. 9) Dimensions Length in Width in High in Weight in kg Plant on platform 4 16 9 Plant on skid 4 16 189 Plant on cart ** 16 3 65 Plant on cart with tarpaulin ** 16 57 8 Plant on cart with metallic cover ** 16 57 3 Plant on road trailer with tarpaulin 3** 17 79 35* Plant on road trailer with metallic cover 3** 17 79 35* * : The weight is not higher for the road trailers equipped with tarpaulin or metallic cover ** : The lengths are given without the draw bar All characteristics may be modified without any prior notice.
I BETH8GB_A page 5/5 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. ) 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 : km/h). ) 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 coissioned 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. ) 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. ) HIGHER HEATING POWER The standard heating power of the oil treatment plants has been calculated for a weight ratio between oil and transformer about 4. In case of a higher ratio, we recoend 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