NEW OIL REGENERATION PLANT WITH REACTIVATED FULLER’S EARTH 1

Oil regeneration with reactivated Fuller’s Earth Applications: Reduction in oil acidity from 0.4 mg Koh/gm to 0.03 mg Koh/gm. Advantages: The same quantity of Fuller’s earth can be used >300 times due to the unique reactivation process. 2 2

Benefit of the oil regeneration process compared to conventional purification system. Remove contaminants such as acids, sludge, anilines and decaying products. Improve color, oxidation stability, Interfacial tension and power factor Extend the oil life-time cycle Extend more significantly the life-time cycle of power transformers (with regular regeneration treatment) 3

Strengths & Weaknesses of the different solutions to solve acidity Change the oil to a new or reclaimed oil No specific equipment required: (oil pump, oil treatment plant, tank,..) No graduate people required Power shutdown Subject to new oil price $$$$$ or difficult to find reclaimed oil. Old oil has to be disposal or resale for third applications at very low price. Short term solutions, no clean out of the transformer. Several people requested Regenerate the oil No power shutdown during regeneration process Short pay back return No oil to eliminate No subject to oil price fluctuation or shortage Clean out the transformer Specific equipment required Not a lot of equipment available Graduate people required 4

Main differences between both solutions to regenerate dielectric oil Regeneration with disposable Fuller’s earth Regeneration with reactivated Fuller’s earth Oil losses 6% 0,4% Fuller’s earth losses 100% 0,01% by reactivation (limit 70% before replacement) Tasks Replacement of Fuller’s earth at saturation Replacement almost once a year Workforce Several people to handle operations One people for normal operations Few people for Fuller’s Earth replacement. 5

ARRAS MAXEI Advantages -More than 60 years of experience in oil treatment plant manufacturing -Manufacturing complying with CE regulation standards -On going Research and Development Improved reactivation control New column design Friendly touch control panel -Reliable and convenient after sales service 6

ERP 5000 SINGLE PASS QUALITY Oil test results (general) TEST DESCRIPTION METHOD UNIT INITIAL OIL CONDITION ERP 5000 SINGLE PASS QUALITY GAS CONTENT GC %v/v 8 0,01 IFT ASTM Dynes/cm <15 >40 COLOR APPEARANCE -- Visual Brown/Cloudy Clear Light Yellow TAN DELTA (90°C) IEC 247 <0,01 <0,005 OXIDATION STABILITY IEC 74 164 HRS Depleted Restored MOISTURE IEC 733 ppm <200 5 BREAKDOWN VOLT IEC 156 kV <30 >75 ACIDITY IEC 296 mgKOH/gm 0,4 <0,03 7

ARRAS MAXEI Product range MAS 5000 ERP 6 Columns MAS 5000 ERP 9 Columns 12 Columns ERP Dual bank of columns Flow rate 5000 l/h Regenerated oil 2400 l/day 3600 l/day 4800 l/day Capacity x 2 Filtration 1µm absolute Treatment heating power 80 k W 80 kW Reactivation heating power 36 kW 54 kW 72 kW 3 kW per column Total heating power 116 kW 134 kW 152 kW Reactivation+ Treatment heating power Limit vacuum closed suction 0,5 mbar Vacuum in treatment (mbar) 0,5 to 5 Fullers earth quantity 600 kgs 900 kgs 1200 kgs Nbre columns x 100 kgs 8

Main Characteristics : Off-line or on-line treatment and regeneration Fully automatic control: -Continuous control of overpressures in the piping network. -Automatic foam regulation -Continuous control of overpressures, temperature, water content and filter clogging. -oil heating system. -Continuous control of the oil level in the transformer and plant -Buchholz control connected to plant PLC Double filtration: -7 µ absolute at the inlet -1 µ absolute at the outlet Connexions: - Special insulation valves with progressive opening at the transformer inlet and outlet -Transformer by-pass valve utilized during start up procedure. -Plant earthed to transformer earth strep. 9

Options: On-line water PPM measurement: Colour comparison control to launch the reactivation process Air conditioned for control room Remote control to GSM Network (Alarms or alarms and treatment parameters) Additional vacuum pump for transformer excavation DBPC injection system Cable reel 10

General layout 11

Container design for easy access and maintenance Presentation SKID SEMI TRAILER Container design for easy access and maintenance SEA CONTAINER (20’ OR 40’)° 12