PREAMBLE The efficient and reliable use of dielectric fluids in trans-formers, circuit breakers and other types of electrical equipments depends upon some of their basic character-istics, which in service may be affected, resulting in re-duced operating efficiency of the electrical equipments. In order to act as an insulant, a coolant and an extinguish-ing medium, dielectric fluids must have some basic proper-ties, and especially a high dielectric strength. Now, in service, the dielectric fluids basic properties may be affected by oxidation, con-densation and other contami-nants such as dissolved gases and solid impurities. Working on the principles of filtration, dehydration, and vacuum degasification,

MAXEI Industries Electri-ques oil treatment plants are particularly recom-mended to maintain, dry and fill your transformers and circuit- breakers. By removing solid impuri-ties, dissolved moisture and gases from insulating and cooling oils, they indeed enable to restore the oil dielectric properties, and thus to extend the useful life of your electrical equip-ment. Used and reknowned all over the world for their perform-ance, reliability and ease of operation, our standard plants have been enriched with the latest technological achievements in order to develop a complete range of plants meant to treat live / operating transformers. As their operation principle has been approved further to

tests performed in our Quality and Control platform, ARRAS MAXEI treatment plants meant to treat live / operating transformers ensure a reliable and safe treatment of the transformer. Available with various auto-mation levels, the MAS 4000 TEC and MAS 2000 TEC plants can operate not only on live / operating trans-formers, but also on non-energized transformers ei-ther for their filling-up or for their traditional mainte-

MAS 4000 TEC on a skid

Principle of operation 2

Main characteristics 2

Components of the plant 2

Description of the plant 3

Flow diagram 4

Options 5

SUMMARY:

TECHNICAL DESCRIPTION OF THE OIL TREATMENT PLANT MEANT TO TREAT LIVE / OPERATING TRANSFORMERS

TYPE MAS 4000 TEC

ARRAS MAXEI OIL TREATMENT

I–BETH09GB_E page 1/6

MAS 4000 TEC

ARRAS MAXEI MAS 4000 TEC plant has been especially designed to carry out the operations of filtration, dehydration and ab-sorption of dissolved gases on a transformer that is under current or operating. Then, the transformer is totally available during the treatment operations that are necessary for its efficient and safe operation. Furthermore, the transformer does not need to be stopped at all during connection with the plant if the security distance between the transformer’s connections and the terminals can be re-spected. ARRAS MAXEI MAS 4000 TEC plant has been designed to treat dielectric oil with a 50 ppm moisture content and a dissolved gas

content of approx. 10% by volume before being treated. Once the optimal treatment conditions have been reached, the clean treated oil goes out after 1 pass at a maxi-mum temperature of 70°C with a moisture content below 5 ppm* and a dissolved gas content of approximately 0.1% by vol-ume*. This restores the oil dielectric strength to a value in excess of 75 kV after treatment. An oil at 20 ppm will go out at 3 ppm* after 1 pass. These charac-teristics are given for a distillation curve of 1.10-2 mbar at 80°C. For a treatment of the active parts of transformer, these data can vary in function of the state of the transformer.

Type of transformer to be treated Up to 220 kV

Max. oil quantity 100 000 litres

Treatment of live / operating transformers with MAS 4000 TEC Co mparis o n be twenn vapo r and liquid phas es o f mo is ture and die lec tric o il

0 , 0 10 , 1110

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1,00

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Teneur en eau

Température en entrée

Régulation de température

Température en sortie

°C et % d'eau mbars

The pre-filtered dielectric fluid enters the plant through an inlet strainer, and then passes through an inlet oil pump and into an oil heater, where it is heated by im-mersion heaters. After a first filtration 7 µm absolute through cartridge filter, the dielectric fluid is sprayed into a vacuum chamber on a basket of degassing rings. Finally, after elimination of the air bub-bles and filtration 1µm absolute, the clean treated fluid flows through the out-let oil pump.

Principle of operation

- 1 Inlet oil motor-pump. - 1 Direct electrical heater. - 2 Cartridge filters 6µ absolute. - 1 Dehydration tank. - 1 Outlet oil vacuum motor-pump. - 1 Trap system of free gases. - 1 Cartridge filter 1µ absolute. - 1 Single-staged vacuum motor-pump. - 1 Set measuring, controlling, alarming and regulating apparatus. - 1 Control panel with display and PLC. - 1 Set pipes, valves and accessories for the connection of the plant to the transformer. - 1 Set of 6 hoses with flanges (5 hoses ∅40 , length : 10 m and 1 hose ∅40 , length : 2 m ). In standard presentation, the oil treatment plant is installed on a section iron plate with reten-tion tray and maintenance wheels.

Components of the plant

Options

Low speed trailer

Road trailer

Options

Tarpaulin

Metallic cover

Options

Remote control

Continuous moisture content measurement

Digital recorder

Main characteristics

* : Approximate value. ** : Consumable cartridge with filtration expressed in absolute µm at 99.9 %. Our plants are all equipped with tropicalized electrical material Power supply 400 Volts 3 phases 50 Hz Auxiliary operation in 220 Volts by transformer.

Nominal flow* during treatment (l/hr) 4 000

Heating power (kW) 78

Total power (kW) 88

Filtration** by cartridge in absolute µm 0,5

Limit vacuum against closed suction (mbar) 0.08

Vacuum during treatment (mbar) 0.5 to 2

I–BETH09GB_E page 2/6 ARRAS MAXEI OIL TREATMENT

MAS 4000 TEC

Description of the plant Inlet oil pump Maximum flow of pump in l/hr 7000

Pump type Centrifugal

Discharge rate in mCE 55

Motor power in kW 2.2

Rotation speed in rpm 1500

Pump construction Cast iron/steel

Connection diameter in mm 40

Oil heating Total heating power in kW 78

Number of thermo-dippers 10

Power of an element in kW 7.8

Auxiliary heating diameter 40

Filtration 6µm absolute Number of cartridges per filter 6

Number of filters 1

Filter construction Cast iron/steel

Clogging control Pressostat

Filtration 1µm absolute Number of cartridges per filter 1

Filter construction Cast iron/steel

Clogging control Pressostat

Vacuum pump Flow in m3/hr 170

Limit vacuum in mbar 0.08

Motor power in kW 4

Rotation speed in rpm 1450

Oil capacity in litres 5

Vacuum measurement Pirani

Auxiliary vacuum connection 50

Outlet oil pump Maximum flow of pump in l/hr 4500

Pump type Centrifugal

Discharge rate in mCE 40

Motor power in kW 3

Rotation speed in rpm 1500

Pump building Cast iron/bronze

Connection diameter in mm 40

Continuous control of the temperature of the plant at oil inlet, before degassing chamber and at oil outlet. Remote control of the overheating through security thermostat. Permanent control of the overpressures in the network thanks to pressostat, security valve and by-pass. Flows display at inlet, before degassing (regulation and mini-mum flow) and outlet of the plant. Continuous control of the oil levels and condensates in the plant. Continuous control of the oil level in the transformer. Automatic regulation of foaming effects. Tri-filtration through strainer (0.8 mm), filtration before de-gassing (7µm absolute) and fine filtration (1µm absolute) at out-let. Remote control of filters clogging with pressostat. Vacuum control with Pirani gauge and manometer. Removal of free gases and air bubbles at the outlet of the plant. Detection and automatic draining of free gases at plant outlet. Running of the plant thanks to an operating system. Self-operating in compressed air by compressor. Vacuum accumulator for draining of transformers’ connections. Secure connections to the transformer.

Filling of the plant. Piping put under vacuum. Filling of the piping. Treatment in closed circuit. Treatment on transformer. Draining of the piping. Draining of the plant. Vacuum in the accumulator for the pipes draining.

Automated and rationalized starting sequences.

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MAS 4000 TEC

Comment : MAS 4000 TEC is also equipped with an additive func-tion in order to treat off line transformers, using the MAS TEC safeties. Moreover, you can also use it with the standards safeties used for MAS type treatment plants.

Control panel

ARRAS MAXEI oil treatment plant type MAS 4000 TEC is equipped with a watertight panel of industrial type in painted cast iron, with PLC, contactors, relays, terminal boards, and every cables necessary for the plant operation. On the door of the control panel stand the operating desk, the switches and the warning lights of the different components.

Painting ARRAS MAXEI oil treatment plant type MAS 4000 TEC is painted in white (RAL9002). Approximate dimensions

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MAS 4000 TEC

Machine length in mm

Width

in mm

Heigh

in mm

Total length in mm

Plant on a platform with tarpaulin 3450 2150 2350 Ø

Plant on a platform with metallic cover

3450 2150 2250 Ø

Plant on a skid with tarpaulin 3250 2150 2250 Ø

Plant on a low speed trailer with tarpaulin

3250 2000 2650 4250*

Plant on a low speed trailer with metallic cover

3300 2150 2450 4250*

Plant on a road trailer with tarpau-lin

3400 2150 2850 5250*

Plant on a skid with metallic cover 3450 2150 2150 Ø

Weight

in kg 2800

3100

2800

3100

3000

3300

3100

Plant on a road trailer with metallic cover

3450 2150 2650 5250* 3500

* : Dimension with the draw bar

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I–BETH09GB_E page 5/6 ARRAS MAXEI OIL TREATMENT

MAS 4000 TEC

1) LOW SPEED TRAILER The oil treatment can be installed on a low speed trailer with full tyres (max. speed : 20 km/hr). 2) ROAD TRAILER The oil treatment plant can be installed on a road trailer. The trailer is equipped with rear lights in accordance with the EU regula-tions of road code. The whole installation is commissioned by the French government vehicle testing service to be allowed to circu-late in France and in the European countries. 3) TARPAULIN PROTECTION The plant can be equipped with a protection type tarpaulin, which protects it from bad weather. The tarpaulin can be opened on the four sides thanks to its 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 bad weather. It is made of aluminium and the frame is made of iron steel. The side panels open horizontally, close per key and are maintained thanks to gas jacks. The panels en-able the access to the components of the plant.

Presentations

Options AUTOMATIC DRAINING OF THE VALVE This option enables an optimal protection of the vacuum net of the plant.

VOLTMETER / AMMETER This option will enable you to visualize the power supply of the plant, as well as the strength developed in order to protect the net and equipment.

REMOTE CONTROL The remote control enables to be informed of the plant operation through an internal phone line, a TELECOM phone line, or through the GSM network. RECORDER This option enables to record the physical parameters of the degassing process like temperature and vacuum level.

CONTINUOUS MOISTURE CONTENT MEASURING This option has been designed to carry out on-line moisture content measurement, that means continuously during the oil treatment. Then you reduce the errors linked to the sampling method and the risks due to hot oil handling.

REGENERATION This option enables to regenerate the oil and to decrease its acidity thanks to absorbent and colloidal properties product.

Process controls

Low speed trailer with tarpaulin Skid with tarpaulin Road trailer with metallic cover

I–BETH09GB_E page 6/6 ARRAS MAXEI OIL TREATMENT

MAS 4000 TEC

GSM remote control

Digital recorder