Transformer oil coolers BETA & CETA

Transformer oil coolers BETA & CETA

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Cooler with four fan units and vertical installation for horizontal air flow.

General Features A new type of motor has been installed in the fan section, offering significant improvement in noise level and power consumption, but also cooling capacity. The new integrated fan-motor features external rotor technology for faster and easier maintenance.

The BETA and CETA transformer oil coolers are delivered as fully factory-assembled units. The difference between the two coolers is their size - CETA is larger than BETA. Each cooler consists of a casing with a finned tube heat exchanger, with one or up to four fan units. If the cooler has more than one fan, the fans are separated by partition walls. This enables better power regulation, by switching on or off one fan at a time depending on the unique cooling needs. The cooler is designed to withstand vibrations, shocks, seismic forces and thermal movements.

Impeller blade designed for low sound.

Technical data BETA & CETAMax. working pressure: 0.35 MPa Test pressure: 0.5 MPa Max. working temperature: 100°CMin. working temperature: -20°C

Luvata is pleased to present

to the market its renewed

transformer oil coolers.

The BETA and CETA series of

transfer oil coolers have been

improved in accordance with

the new ErP 2013 directive and

following the EN 50216.

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Finned heat exchanger The finned heat exchanger includes bolted headers made of anti-corrosion coated steel. The rubber o-rings arranged between the headers and the tube plates provide an effective seal. The finned coil body is standard made of aluminium, making it highly corrosion resistant. The continuous arrangement of the coil fins and the wide fin pitch provide good resistance against clogging. Plugged vent and drain connec-tions are provided on each header.

Fan unit The fan unit has a direct-driven axial fan. The impeller blades and hub are made of aluminium. The impeller is balanced ac-cording to ISO-1940/1. The fan is driven by a totally enclosed, three-phase, induc-tion motor with protection class IP55 and F-insulation. The motor is delivered with plugged drain holes. This new fan-motor design provides the external rotor solution

as standard. The fans are also available in different speeds, depending on the sound requirements.

Safety switch Each motor is cabled to a lockable safety switch. The switch has a normally open auxiliary contact.

Cleanliness Before delivery each cooler is carefully cleaned inside by flushing with transformer oil, with an on-line particle counter to ensure it meets the requirements for cleanliness for power transformer appli- cations in accordance with ISO 440, 10/7. The oil connections are sealed off and tightened for shipment.

The new integrated fan-motor features external rotor technology for faster and easier maintenance.

The Luvata transformer oil cooler concept, type Oil Forced Air Forced (OFAF), offers many benefits including:

• Pre-designed with simple ordering product code• Two types – BETA & CETA• Different sizes within each cooler type• Wide capacity range• High cooling capacity and compact design• Low sound level - different fan speeds• Low energy consumption• Two different connections within one motor: Delta and Star• Horizontal or vertical installation design• Thoroughly cleaned inside by oil flushing• Different materials available• Computer program available for correct sizing

Fan unit with lockable safety switch.

Tubeplate with smoothly rolled-in tubes.

Casing, Packing & Electric cabling

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CasingThe casing of the heat exchanger is made of hot-dip galvanized steel. The fan deck is made of Aluzinc® steel sheet and the fan cone is made of painted pre-galvanized steel. If required it can be painted for esthetical reasons or increased corrosion protection. The casing is provided with lifting lugs as well as brackets, in order to fit the cooler to the transformer. The fan protection guard, fixed with the fan, can easily be removed for inspection or when replacement of the fan or motor is required.

Packing The transformer coolers are delivered bolted to a wooden pallet, but separate wooden boxes or alternative packing options are also available upon request. A protective plastic wrapping covers the fan unit. The oil con-nections of the heat exchanger are covered.

Electric cabling inside the casing Available upon request for easier electric power supply connection, the fan motors can be cabled from each safety switch to one common connection box. The connection box is made of stainless steel and has a venting membrane. Each motor is equipped with a thermal contact that can be cabled to the common terminal box (optional).

The standard cable type is Ölflex Heat 145 MC and the terminal blocks are supplied by Phoenix. Extra cable with terminal blocks for connection of an oil circulation pump motor can be provided (optional).

Transformer oil circulation pump type VMOA can be supplied by Luvata Söderköping AB. The pump has an integrated motor and is highly efficient, cooled and lubricated by the transformer oil, robust, reliable and maintenance free. The sound level is also low. The pump can be supplied in two different sizes and with varying flow rates.

Oil pump type VMOA.

The connection box is made of stainless steel. Coolers ready for shipment.

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Materials, Outline dimensions & Options

Cooler A B C D E F G

BETA 1642 2842 4042 5242 1472 800 ~790

CETA 1842 3242 4642 6042 1872 1000 ~850/1040*

All dimensions in mm. * Integrated fan unit solution.

One fan

1. Tubes – Aluminium

2. Fins – Aluminium

3. Tube plate – Aluminium

4. O-ring gasket – NBR 70º

5. Header – Steel, coated with RILSAN® (polyamide 11), colour RAL 7001

6. Flange connection – EN 1092-1 type 11 PN16 or ANSI B16.5 150 Lb

7. Drain/venting plug – M16, stainless steel

8. Washer – Copper

9. Casing & framework – Hot-dip galvanized steel acc. to EN ISO 1461

10. Cellular rubber gasket – EPDM

11. Fan casing – Painted galvanized steel

12. Impeller blade/hub – Aluminium

13. Safety switch – Plastic housing IP 65/IEC 947-3

14. Electric motor – Cast Aluminium, IP 55/IEC 34-1 with plugged drain holes

15. Fan guard – Painted galvanized steel

Standard Materials:

1 2 3 4 5

6

78

910

11

12131415

Outline dimensions: subject to change without prior notice.

A

G

Two fans

B

Three fans

C

Four fans

D

E

F

Computer selection program COILS The BETA and CETA transformer oil coolers are available in a wide range of configurations. Luvata’s computer program COILS is used to select and size the correct cooler. The program generates a print-out of technical data and a dimensional drawing of the selected cooler. Some variables to be considered while sizing and selecting include:

• Cooling capacity• Oil flow rate & temperatures• Fan motor power supply• Ambient temperature• Environmental conditions• Sound level (fan speed)

• Cooler size• Number of fans• Number of tube rows• Number of oil passes• With or without turbulators• Mounting alternative

Contact us and we can supply you with the program or help you in selecting the optimal cooler.

Options and accessories We offer a wide range of standard and special options & accessories.

Standard Special option

Corrosion class paint C3 C4, C5 as per EN12944:5

Packing type Bottom pallet road Crate pallet road Container

Fan motor AC technology EC technology with different voltages

Accessories: pumps, safety switches, terminal boxes.

Contact us for additional customisation possibilities. Taylor made solutions are available on request.

The tables below show motor data and sound data for both cooler types. Specified motor data is for one fan motor only and for standard motors. Special motors can be delivered upon request.

Motor data & Sound data

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Motor data BETA50 Hz

60 Hz

HzNo. of poles

Rated motor speed

(rpm)Voltage

Rated output*

(kW)

Rated current**

(A)

Starting current

(A)

cos

6860 620

400 V∆ 2,10 1,15

4,10 2,20

11,0 3,7

0,68

50 8650 470

400 V∆ 0,93 0,51

2,30 1,10

6,0 2,0

0,60

12430 320

400 V∆ 0,37 0,21

0,93 0,42

1,5 0,2

0,42

HzNo. of poles

Rated motor speed

(rpm)Voltage

Rated output*

(kW)

Rated current**

(A)

Starting current

(A)

cos

6880 590

460 V∆ 2,50 1,15

4,20 1,90

9,53 3,20

0,75

50 8730 490

460 V∆ 1,40 0,66

2,80 1,25

6,00 2,00

0,62

12490 320

460 V∆ 0,54 0,26

1,05 0,49

1,50 0,50

0,46

50

60

Y

Y

Y

Motor data CETA50 Hz

HzNo. of poles

Rated motor speed

(rpm)Voltage

Rated output*

(kW)

Rated current**

(A)

Starting current

(A)

cos

6 960 400 V∆ 4,80 10,34 69,0 0,679

50 6870 660

400 V∆ 3,10 1,95

5,50 3,40

22,0 7,0

0,680

8690 570

400 V∆ 1,55 1,15

3,30 2,00

14,0 4,4

0,600

50 Y

Y

60 Hz

HzNo. of poles

Rated motor speed

(rpm)Voltage

Rated output*

(kW)

Rated current**

(A)

Starting current

(A)

cos

6 1160 460 V∆ 6,05 10,4 69,0 0,778

50 6870 660

460 V∆ 4,10 2,20

6,5 2,2

17,0 5,5

0,75

8710 520

460 V∆ 1,90 1,05

5,7 3,3

15,0 5,0

0,62

60 Y

Y

Sound pressure level, db (A), at distance 2 m, per one cooler acc. to EN 60076.

Frequency

No. of poles 6 6 8 8 12 12 6 6 8 8 12 12

∆ ∆ ∆ ∆ ∆ ∆

No. of fans Lw Lw Lw Lw Lw Lw

1 81 74 72 68 63 58 81 74 75 67 68 60

2 84 77 75 71 66 61 84 77 78 70 71 63

3 86 79 77 73 68 63 86 79 80 72 73 65

4 87 80 78 74 69 64 87 80 81 73 74 66

50 Hz 60 Hz

Sound data BETASound power level, db (A), per one cooler according to ISO 3744.

Y Y Y Y Y Y

50 Hz 60 Hz

Frequency

No. of poles 6 6 8 8 12 12 6 6 8 8 12 12

∆ ∆ ∆ ∆ ∆ ∆

No. of fans Lp Lp Lp Lp Lp Lp

1 65 58 56 52 47 42 65 59 58 51 52 44

2 68 61 59 55 50 45 68 61 62 54 55 47

3 70 63 61 57 52 47 70 63 64 56 57 49

4 71 64 62 58 53 48 71 64 65 57 58 50

50 Hz 60 Hz

Y Y Y Y Y Y

50 Hz 60 Hz

*) Calculated consumed power at ambient temperature 20 degree C. **) The maximum current increasing is +/-10%.

The tolerance of the sound pressure levels are +/- 3 dB(A) depending on individual differences.

Sound pressure level, db (A), at distance 2 m, per one cooler acc. to EN 60076.

Sound data CETASound power level, db (A), per one cooler according to ISO 3744.

Frequency

No. of poles 6 6 6 8 8 6 6 6 8 8

∆ ∆ ∆ ∆ ∆ ∆

No. of fans Lw Lw Lw Lw

1 94 88 82 81 77 97 92 79 85 73

2 97 91 85 84 81 100 95 82 88 76

3 99 93 87 86 83 102 97 84 90 78

4 100 94 88 87 84 105 98 85 91 79

50 Hz 60 Hz

Y Y Y Y

50 Hz 60 Hz

The tolerance of the sound pressure levels are +/- 3 dB(A) depending on individual differences.

Frequency

No. of poles 6 6 6 8 8 6 6 6 8 8

∆ ∆ ∆ ∆ ∆ ∆

No. of fans Lp Lp Lp Lp Lp

1 77 71 65 64 60 80 75 62 68 56

2 80 74 68 67 64 83 78 65 71 59

3 82 76 70 69 66 85 80 67 73 61

4 83 77 71 70 67 88 81 68 74 62

50 Hz 60 Hz

Y Y Y Y

50 Hz 60 Hz

*) Calculated consumed power at ambient temperature 20 degree C. **) The maximum current increasing is +/-10%.

Y

Y

Y

The tolerance of the sound power levels are +/- 1,5 dB(A) depending on individual differences. The tolerance of the sound power levels are +/- 1,5 dB(A) depending on individual differences

BETA –aa-b-c-d-eee-f-gg-hh CETA –aa-b-c-d-eee-f-gg-hh

aa = a1 = Number of fans: 1, 2, 3 or 4

a2 = Number of tube rows: 3, 4, 5 or 6

b = Number of oil passes: 1, 2, 3 or 4

c = Turbulator inserts:

0= without spiral inserts,

4= with spirals inserts

d = Oil connection flange size:

1 = DN 80 EN 1092-1 type 11 PN16

2 = DN 100 EN 1092-1 type 11 PN16

3 = DN 125 EN 1092-1 type 11 PN16

4 = DN 150 EN 1092-1 type 11 PN16

5 = 3” ANSI B16.5 150Lb

6 = 4” ANSI B16.5 150Lb

7 = 5” ANSI B16.5 150Lb

8 = 6” ANSI B16.5 150Lb

9 = DN 100, flat square flange with M16 bolts

eee = Motor data (voltage, frequency and number of poles):

56D = 400 V, 50 Hz, 6-poles, D conn.

56Y = 400 V, 50 Hz, 6-poles, Y conn.

58D = 400 V, 50 Hz, 8-poles, D conn.

58Y = 400 V, 50 Hz, 8-poles, Y conn.

52D = 400 V, 50 Hz, 12-poles, D conn.

52Y = 400 V, 50 Hz, 12-poles, Y conn.

66D = 480 V, 60 Hz, 6-poles, D conn.

66Y = 480 V, 60 Hz, 6-poles, Y conn.

68D = 480 V, 60 Hz, 8-poles, D conn.

68Y = 480 V, 60 Hz, 8-poles, Y conn.

62D = 480 V, 60 Hz, 12-poles, D conn.

62Y = 480 V, 60 Hz, 12-poles, Y conn.

f = Tube material, tube plates and fins:

1= Aluminium - Aluminium - Aluminium

2= Copper - Brass - Aluminium

3= Copper - Brass - Copper

4= Aluminium - Aluminium - AlMg

gg = Mounting arrangement:

g1= 1= standard connection,

2= mirrored connections

g2= see alternatives to the right.

h = Internal design code

CODE KEY Installation mounting arrangements

Product code key & installation mounting arrangements

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Arrangement 11

Arrangement 12

Arrangement 13

Arrangement 16

Arrangement 15

Arrangement 14

About LuvataLuvata is a world leader in metal solutions manufacturing and related engineering services. Luvata’s solutions are used in industries such as renewable energy, power generation, automotive, medicine, air-conditioning, industrial refrigeration, and consumer products. The company’s continued success is attributed to its longevity, technological excellence and strategy of building partnerships beyond metals. Employing over 6,400 staff in 13 countries, Luvata works in partnership with customers such as Siemens, Toyota, CERN, and DWD International.

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