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AFWF Transformer Enclosures
Water cooled transformers
D e s i g n b y I n n o v a t i o n
– Definition
AFWF is a dry type transformer cooling system which can stand alone as self-cooled with only
supply of cold water and fan power.
– Design figures
● Product Description
Enclosure
(Closed to ambient)
Exchanger
Transformer
Water-in
Water-out
Fan
– How to design?
As STE Technic, we support you from quotation to FAT. We suuport all the design,
manufacturing, testing and customer negotiations.
– Flow Chart
● Project Flow
– Design details
Transformer enclosure is closed to air transfer from ambient and reverse. By doing so, most
of heat dissipation is being done by the heat exchanger to the water, which is being supplied.
– Statements
System can be optimized with the information of supplied water flow rate and its
temperature. With those inputs, heat exchanger capacity and fans can be verified. Also other
sensors can check system status to avoid any unexpected problem.
● Type of cooling system
Flow diagram:
Water
circulation
(Supplied
by customer)
Cold Air
Fan
Drop
Barrier
Transformer
Exchanger
Sensors
Enclosure
Closed Air
circulation
Hot Air
Cold
Water
Hot
Water
Sensors
– Main Parts list
- Heat Exchanger
- Axial Fans
- Enclosure
- Cooling Control System
– Part Details
- Heat Exchanger  To dissipate heat of transformer to water with a closed loop circulation
of air and water inside the enclosure. Made of oxidation-proof coated Aluminum/Copper fins
and copper piping.
- Axial fans  To circulate air inside of the enclosure.
- Enclosure  Fully closed to ambient. Made of galvanized painted steel with air insulation.
- Cooling control system  To control all system and give feedbacks to control room.
● Main parts of AFWF DDT
– Part Details
- Sensors Cooling system control devices;
● Main parts of AFWF DTT
1) Water flow-rate meter (Optional)
Used to check water flow-rate supplied to heat
exchanger. If below the limits gives warning.
2) Water drop barrier (Optional)
Used to block water drops to be poured on to the
transformer. Drain pan can collect drops.
3) Leakage detector (Optional)
Used to check water-in and water-out status. If
there is a leakage problem in the heat exchanger
gives warning.
4) Drop Sensor (Optional)
Used to sense the water drops before reaching to
transformer when a leakage occurs
– Application areas
AFWF system is designed specially for indoor and outdoor operation where there is no
natural or forced air cooling option provided by site or customer. Also if there is a
requirement of high IP class it is the best option. Up to IP55 is can be achieved.
– Requirements
Design is compact which can be shipped as ready to be installed.
The technical requirements for the design are as follows;
- Water-in supply quantity (m3/h)
- Water-in supply temperature (°C)
- Water-in type (Pure water, water with glycol additive)
- Water-in maximum pressure (Bar)
- Transformer ambient temperature (Design temp °C)
- Enclosure ambient temperature (Space temp °C)
- Working conditions (Marine, Indoor, Outdoor, Tropical, etc..)
● Customer Benefits
● Figures
Design and appearance can vary according to requirements and restrictions
● Figures
* Design and appearance can vary according to requirements and restrictions

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AFWF Cooling System

  • 1. AFWF Transformer Enclosures Water cooled transformers D e s i g n b y I n n o v a t i o n
  • 2. – Definition AFWF is a dry type transformer cooling system which can stand alone as self-cooled with only supply of cold water and fan power. – Design figures ● Product Description Enclosure (Closed to ambient) Exchanger Transformer Water-in Water-out Fan
  • 3. – How to design? As STE Technic, we support you from quotation to FAT. We suuport all the design, manufacturing, testing and customer negotiations. – Flow Chart ● Project Flow
  • 4. – Design details Transformer enclosure is closed to air transfer from ambient and reverse. By doing so, most of heat dissipation is being done by the heat exchanger to the water, which is being supplied. – Statements System can be optimized with the information of supplied water flow rate and its temperature. With those inputs, heat exchanger capacity and fans can be verified. Also other sensors can check system status to avoid any unexpected problem. ● Type of cooling system Flow diagram: Water circulation (Supplied by customer) Cold Air Fan Drop Barrier Transformer Exchanger Sensors Enclosure Closed Air circulation Hot Air Cold Water Hot Water Sensors
  • 5. – Main Parts list - Heat Exchanger - Axial Fans - Enclosure - Cooling Control System – Part Details - Heat Exchanger  To dissipate heat of transformer to water with a closed loop circulation of air and water inside the enclosure. Made of oxidation-proof coated Aluminum/Copper fins and copper piping. - Axial fans  To circulate air inside of the enclosure. - Enclosure  Fully closed to ambient. Made of galvanized painted steel with air insulation. - Cooling control system  To control all system and give feedbacks to control room. ● Main parts of AFWF DDT
  • 6. – Part Details - Sensors Cooling system control devices; ● Main parts of AFWF DTT 1) Water flow-rate meter (Optional) Used to check water flow-rate supplied to heat exchanger. If below the limits gives warning. 2) Water drop barrier (Optional) Used to block water drops to be poured on to the transformer. Drain pan can collect drops. 3) Leakage detector (Optional) Used to check water-in and water-out status. If there is a leakage problem in the heat exchanger gives warning. 4) Drop Sensor (Optional) Used to sense the water drops before reaching to transformer when a leakage occurs
  • 7. – Application areas AFWF system is designed specially for indoor and outdoor operation where there is no natural or forced air cooling option provided by site or customer. Also if there is a requirement of high IP class it is the best option. Up to IP55 is can be achieved. – Requirements Design is compact which can be shipped as ready to be installed. The technical requirements for the design are as follows; - Water-in supply quantity (m3/h) - Water-in supply temperature (°C) - Water-in type (Pure water, water with glycol additive) - Water-in maximum pressure (Bar) - Transformer ambient temperature (Design temp °C) - Enclosure ambient temperature (Space temp °C) - Working conditions (Marine, Indoor, Outdoor, Tropical, etc..) ● Customer Benefits
  • 8. ● Figures Design and appearance can vary according to requirements and restrictions
  • 9. ● Figures * Design and appearance can vary according to requirements and restrictions