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Oil immersed Transformer

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PRODUCT LINE: Oil immersed Transformer

REPRESENTATIVE PRODUCTS:

Product Advantages:

Well arranged core construction

The core is made of top-class Hi-B (high magnetic flux density) oriented silicon steel plate with improved exciting characteristics such as core loss, exciting current, magnetostriction, etc. The core is tightened uniformly with tempered plastic bands and also a core election equipment is employed, thus making it small-sized and lightweight together with low noise level.

In details:

  • Since there are no holes in the core plate, it provides for easy machining and improve the characteristics.
  • The core tightening bolts are cooled directly by insulation oil since they pass through the oil duct.
  • Because of using the tempered plastic bands, the core plate ends can be tightened securely.
  • As a result of improving the space factor of core, the transformer can be made compact and lightweight.

Core construction

Winding construction

Various windings have been developed in addition to the conventional twin coil disc winding, and according to the purpose of use, the optimum winding is selected from those listed below so that the specific characteristics can be fully utilized.

For low voltage and large current;
Cylindrical layer winding (using transposed conductor)
Helical winding
For high voltage and surge protection;
High series capacitance disc winding
For wide-range tap;
Multi-parallel cylindrical tap winding

Highly reliable insulation

For the windings of extra high voltage transformers, a high series capacitance disc winding, in which potential oscillation in the winding is suppressed to a minimum when impulse voltage is applied. The insulation in the windings, across windings and across winding and ground has been made very reliable as a result of numerous fundamental experiments and improvement of potential distribution and insulation strength by utilizing a computer. Also, extra high voltage are given a partial discharge test to verify the insulation reliability before leaving the plant.

Fig.1 High series capacitance disc winding

Winding work in dust-proof air-conditioned room

Assembling of active parts in dust-proof air-conditioned room

Loss reduction technology

As the winding conductor, a transposed conductor has been employed besides the rectangular copper wire to cope with the increase in transformer capacity. 
The transposed conductor is made as follows;
With the finely divided rectangular conductors each insulated with synthetic resin consisting mainly of polyvinyl formal, the odd-numbered conductors are arranged in two rows as shown in Fig.2, the mutual positions of conductors are transposed in turn at a certain pitch, and with these conductors put together as a unit, the same electric insulation Kraft paper as used for ordinary rectangular copper wires is wound thereon for insulation. When this transposed conductor is used, the following merits are available:

  1. Reduction in stray load loss in winding
  2. Prevention of local overheat in winding
  3. Improvement in characteristics, and
  4. Accomplishment of lightweight and compact transformers
  5. Decrease in the number of connecting parts in winding

Fig.2 Transposed conductor

Cooling system

The optimum cooling system will be selected out of following according to the customer ‘s requirements and also taking into account the transformer capacity and circumstances at the installation site.
1) ONAN, 2) ONAF, 3) ODAN, 4)ODAF, 5) OFOW
In a large core, the core internal temperature rise is kept under the limit by providing a cooling oil duct at right angles to the steel plate stacking direction. For the winding, an oil duct is installed in the coil as required for obtaining a high cooling effect.

Fig.4 Hydraulic Flow Analysis

Winding section model for Oil flow research

Forced-oil water-cooled outdoor transformer Of three-phase 60Hz 500MVA and 24/432kV

 

Specifications:

Hermetically Sealed Fully with Mineral oil type

1. Specifications (Technical Data are subjected to change without notice.)

1-1. 22kV – 400/230V & 24kV – 416/240V

ItemCapacityNo loadLoad loss (75oC)ImpedanceDimensions(mm)Total weightOil
kVAWattWatt%HeightLengthWidthkgLiter
15016095041,1001,000700500135
21002501,55041,2501,050750750200
31603602,10041,3001,150750990250
42505002,95041,3501,2007501300300
53158003,90041,4001,4008001300350
64009604,60041,4001,5008501550380
75001,1505,50041,5001,5509001750430
86301,3506,50041,5501,6008502,150450
98001,60011,00061,6001,8001,1002,500650
101,0001,95013,50061,7501,9001,1003,200700
111,2502,30016,40061,8502,0001,1504,000850
121,5002,80019,80061,9502,1001,2504,1501,150
132,0003,25024,00062,0502,2501,3505,6501,450
142,5003,50028,50062,1502,4501,4506,4501,750

1-2. 33kV – 400/230V

ItemCapacityNo loadLoad loss (75oC)ImpedanceDimensions(mm)Total weightOil
kVAWattWatt%HeightLengthWidthkgLiter
15017095041,3001,000700550165
21002601,55041,4001,050750800230
31603702,10041,4501,150750990280
42505202,95041,5001,2007501450350
53158503,90041,5501,3508001450400
640010004,60041,5501,4508501700450
75001,2005,50041,6501,5009001900500
86301,4006,50041,7001,6508502,300550
98001,70011,00061,7501,8501,1002,650700
101,0002,00013,50061,9001,9501,1003,350750
111,2502,35016,40062,0002,0001,1504,150900
121,5002,85019,80062,1002,1001,2504,3001,200
132,0003,30024,00062,2002,2501,3505,8001,450
142,5003,80028,50062,3502,4501,4506,6001,750

Distribution Transformer Outline

Distribution Transformer

2. Accessories (Standard & Option)

ItemkVA5010016025031540050063080010001250150020002500
1Bushings
2Arcing horn
3Off load tap changer
4Earth terminal
5Lifting lug
6Lifting eye
7Wheel
8Nameplate
9Oil drain
10Thermometer pocket
11Marshaling box
12Cable box
13P’ry terminal connectorPad type
Clamp type
14S’ry terminal connectorPad type
Clamp type
15Oil level gaugeW/O contact
16ThermometerW/O contact
2 contact
17WDG Temp.indicator2 contact
18Pressure relief deviceW/O contact
1 contact

Accessaries List
● Standard Accessaries
○ Option Accessaries

3. Remarks

  • Fuji Tusco reserve the right to any changes of these information, herein.
  • Distribution transformers are designed for general application uses at ambient temperature maximum 40℃ at temperature raised 60℃ (top oil) / 65℃ (winding), which will be manufactured and tested in accordance with the latest IEC standard.

Open Type with Conservator Tank (Mineral Oil)

1. Specifications (Technical Data are subjected to change without notice.)

1-1. Open Type with Conservator Tank 22kV – 400/230V & 24kV – 416/240V

ItemCapacityNo loadLoad loss (75oC)ImpedanceDimensions(mm)Total weightOil
kVAWattWatt%HeightLengthWidthkgLiter
15016095041,2501,300850650150
21002501,55041,3501,300850750200
31603602,10041,4501,400850950250
42505002,95041,5501,5008501200320
53158003,90041,6001,5508501250350
64009604,60041,6501,6009001550380
75001,1505,50041,7001,7009501800450
86301,3506,50041,7501,8009502,100600
98001,60011,00061,8501,9001,0502,650650
101,0001,95013,50062,0502,0501,1503,200700
111,2502,30016,40062,1002,2501,2004,000900
121,5002,80019,80062,2502,2501,3504,2001,100
132,0003,25024,00062,3502,3001,4005,5001,200
142,5003,50028,50062,5002,5001,5506,5001,800

1-2. Open Type with Conservator Tank 33kV – 400/230V

ItemCapacityNo loadLoad loss (75oC)ImpedanceDimensions(mm)Total weightOil
kVAWattWatt%HeightLengthWidthkgLiter
15017095041,4501,400900700200
21002601,55041,5501,400900800250
31603702,10041,6501,5009001,000300
42505202,95041,7501,6009001250350
53158503,90041,7501,6509001350400
640010004,60041,8001,7009501650450
75001,2005,50041,8501,80010001900500
86301,4006,50041,9001,9001,0002,200650
98001,70011,00062,0002,0001,1002,750700
101,0002,00013,50062,2002,1501,2003,500750
111,2502,35016,40062,2502,3501,2504,500950
121,5002,85019,80062,4002,3501,4004,8001,150
132,0003,30024,00062,5002,4001,4506,2001,250
142,5003,80028,50062,6502,6001,6007,2001,850

Distribution Transformer Outline

Distribution Transformer

2. Accessories (Standard & Option)

ItemkVA5010016025031540050063080010001250150020002500
1Bushings
2Arcing horn
3Off load tap changer
4Dehydrating breather filled with
silica gel
5Earth terminal
6Lifting lug
7Lifting eye
8Wheel
9Nameplate
10Oil drain
11Thermometer pocket
12Marshaling box
13Cable box
14P’ry terminal connectorPad type
Clamp type
15S’ry terminal connectorPad type
Clamp type
16Oil level gaugeW/O contact
17ThermometerW/O contact
2 contact
18WDG Temp.indicator2 contact
19Buchholz relay2 contact
19Pressure relief deviceW/O contact
1 contact

Accessaries List
● Standard Accessaries
○ Option Accessaries

3. Remarks

  • Fuji Tusco reserve the right to any changes of these information, herein.
  • Distribution transformers are designed for general application uses at ambient temperature maximum 40℃ at temperature raised 60℃ (top oil) / 65℃ (winding), which will be manufactured and tested in accordance with the latest IEC standard.

 

Product lines:

Power Transformers

Medium & Large Distribution Transformers

Small Distribution Transformers

 

Product details at: Catalog

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