Axicooler
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Oil coolers for power transformers Axicooler

2 The power of air Fläkt Solyvent-Ventec has been in the ventilation business since 1919. Th e company specializes in the design, manufacture and sale of industrial fans and oil coolers for power transformers. Ongoing innovation in its products and production facilities, and new fan and oil cooler technologies have made Fläkt Solyvent-Ventec the Centre of Excellence in the group worldwide for industrial centrifugal fans. A global sales network ensures that Fläkt Solyvent-Ventec customers will enjoy a close collaboration. ISO 9001 certifi cation of its Environmental and Quality Management...

3 Design Th e oil coolers are designed and manufactured in our Research & Production Centre based in Meyzieu (near Lyon). Th e facility houses the most modern and advanced production processes: Laser cutting Welding robots Automated paint lines... ••• Th e oil coolers are exclusively adapted to cooling the oil used in power transformers. Th ey are designed to run under the most stringent operating conditions: Temperature Corrosive atmospheres Dust, sand, rain and snow. •••

4 Description 1 - Tube stacks Our fi nned tubes, without inner tubulators, are made of either aluminium or copper, depending on the corrosion risk. Pressure rating: + 350,000 Pa absolute Depression rating: + 100 Pa absolute Th e tubes are roller expanded on a thick steel tube plate (15 or 20 mm). Internal cleanliness After expansion the inside of each tube is visually inspected. After the tightness test (described below), the oil cooler is rinsed with fi ltered transformer oil at 65°C, circulating at high speed for 20 minutes. Th e input and output pipes of the oil cooler are then...

5 Accessories Motor pump exclusively adapted to the circulation of transformer oil motor integrated in pump, ensuring very high reliability operating safety • • • Filter wire guard protection against plant fragments easily removable for cleaning operations •• Oil circulation indicator contact normally closed or open alarm if oil fl ow stops or is too weak no maintenance required ••• Electrical cabinet • designed and built as per specifi cations

6 Selection charts Selection chart for 1 oil passage ÄT = 40k è ambient = +30°C Selection chart for 3 oil passage ÄT = 40k è ambient = +30°C Dissipated power kW Dissipated power kW Oil fl ow m3/h Figure 2 Figure 1 Oil fl ow m3/h

7 Oil cooler On the selection charts, dissipated power P40 (kW) is given as a function of the oil fl ow Q (m3/h) (fi gures 1 and 2). Dissipated power Th e dissipated power is given for an ambient air temperature of 30°C and an atmospheric pressure of 760 mm HG. Th e mean oil temperature rise (ÄT) used in the calculation is 40K. If the mean oil temperature rise is diff erent (ÄT = ä), the new dissipated power Pä of the oil cooler is as follows: Pä = P40 + k (ä - 40). k is a coeffi cient that is specifi c to each coolant. Its value is given in the table in fi gure 4. Th e selection charts...

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AXICOOLER/E - 05/2009-TSJPG - Photos: Pierre Berenger, © EDF and X photo library Fläkt Solyvent-Ventec 143, rue de la République - B.P. 67 69882 Meyzieu Cedex France t + 33 4 72 45 13 00 f + 33 4 72 45 13 42 contact.fr@flaktwoods.com www.flaktwoods.fr The Fläkt Woods company reserves the right to modify the characteristics of the apparatus described in this document at any time. The information contained in this document is therefore not legally binding. For all information, please contact the company that sells the equipment in your country.