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35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer
35kV Oil-immersed Power Transformer

CEEG 35kV Oil-immersed Power Transformer

Brand: CEEG
Type: Oil-immersed Transformer
Winding Type: Multi-winding Transformer
Primary Voltage: 35kV-38.5kV
Rated Capacity: 50kVA-75000kVA
Phase: Three Phase
Vector Group: Yyn0/Yd11/Ynd11
Service: Customized Service
Nature of Business: Manufacturer
Request A Quote

oil-immersed transformer 3.jpg

  1. Low Losses

The core is made of high-quality high-permeability cold-rolled silicon steel sheets. The Swiss automatic core stacking machine is used for vertical and horizontal shearing, and multi-stage full skew joint automatic stacking is employed. The core binding process utilizes integral pressure and PET tape binding techniques, effectively reducing the transformer's no-load losses and no-load current. Performance indicators of the transformer surpass national standards.

  1. Low Noise

The noise of the oil-immersed self-cooling transformer is primarily caused by electromagnetic noise from the core. To reduce noise, our company has taken the following measures:

(1) Low magnetic flux density design.

(2) High-quality high-permeability silicon steel sheets.

(3) Use of the Swiss automatic stacking machine to control stacking precision.

(4) Reliable clamping and bracing measures.

(5) Special damping measures.

  1. No Leakage

The oil tank and oil storage tank have undergone positive and negative pressure leak tests to ensure that there is no oil leakage during normal operation. Component installation utilizes a flange groove structure, and all sealing components are made of high-quality one-piece formed acrylic rubber to prevent oil leakage.

  1. Strong Short Circuit Resistance

To ensure that the transformer can withstand the impact of short-circuit currents without causing any thermal or mechanical damage, our company has taken the following measures in design and manufacturing:

(1) Reasonable calculation of turns and balance for transformer coils, using semi-hard copper wire.

(2) Strength and stiffness calculations for all core clamping components, meeting safety requirements for maximum short-circuit mechanical forces.

(3) Densified treatment of winding spacers, using high-density rigid cardboard.

(4) Integral assembly and compression of windings, ensuring assembly accuracy and short-circuit withstand capability.

Core Technology:

1. The body employs a high-temperature resistant hybrid insulation system, selecting matched components to achieve a true 30-year same-lifespan design.

2. Oil-immersed transformers all adopt the basic structural form of traditional transformers. The core is of the core type, the high-voltage winding uses disc-type coils, and the low-voltage winding employs either wire-wound or foil-wound coils based on capacity. The main difference from traditional transformers lies in the use of high-temperature-resistant insulation paper. The insulation structure of 35kV and below oil-immersed power transformers belongs to a hybrid insulation system, where coil insulation uses high-temperature resistant insulation paper, while areas with lower temperatures utilize insulation materials with lower temperature coefficients.

35kV and below oil-immersed power transformers utilize high-temperature resistant insulation paper as the insulation material, and different temperature areas are equipped with insulation materials of varying temperature resistance levels according to the temperature field principle. As a result, it exhibits excellent temperature resistance performance and is designed with a significant margin of safety.

High-temperature resistant transformers operate safely in environments exceeding 40°C, without compromising their lifespan. Even running at 20% over the rated capacity is still very safe and reliable. This offers a robust solution to ensure a safe power supply during peak load periods.

Parameters Table-ojwz.pngoil transformer.jpg

S11-50~75000/35 Oil-immersed Power Transformer

Rated Capacity
(kVA)

Voltage Combination

Vector Group

No-Load Loss (kW)

Load Loss (kW)(75℃)

No-Load Current (%)

Short Circuit Impedance (%)

High Voltage(kV)

Tapping Range

Low Voltage (kV)

50

35-38.5

±5%
±2x2.5%

0.4

Dyn11
Yyn0

0.16

1.20

1.30

6.5

100

0.23

2.01

1.10

125

0.27

2.37

1.10

160

0.28

2.82

1.00

200

0.34

3.32

1.00

250

0.40

3.95

0.95

315

0.48

4.75

0.95

400

0.58

5.74

0.85

500

0.68

6.91

0.85

630

0.83

7.86

0.65

800

0.98

9.40

0.65

1000

1.15

11.50

0.65

1250

1.40

13.90

0.60

1600

1.69

16.60

0.60

2000

1.99

19.70

0.55

2500

2.36

23.20

0.55

630

35-38.5

±5%
±2x2.5%

3.15
3.3
6.3
6.6
10.5
11.0

Yd11

0.83

7.86

0.65

6.5

800

0.98

9.40

0.65

1000

1.15

11.50

0.55

1250

1.40

13.90

0.45

1600

1.69

16.60

0.45

2000

2.17

18.30

0.45

2500

2.56

19.60

0.45

3150

3.04

23.00

0.45

7.0

4000

3.61

27.30

0.45

5000

4.32

31.30

0.45

6300

5.24

35.00

0.45

8.0

8000

YNd11

7.20

38.40

0.35

10000

8.70

45.30

0.35

12500

10.00

53.80

0.30

16000

12.10

65.80

0.30

20000

14.40

79.50

0.30

25000

17.00

94.00

0.25

8.0
10.0

31500

20.20

112.00

0.25

40000

25.90

150.00

0.25

50000

29.40

210.00

0.25

63000

31.20

250.00

0.20

75000

33.40

300.00

0.20

SZ22-3150~31500/35 Parameters of  On-load tap Oil-Immersed transformer(NX1)

Rated Capacity(kVA)

Voltage Combination

Vector Group

No-Load Loss (kW)

Load Loss
(kW) (75℃)

No-Load Current (%) 

Impedance (%)

High Voltage (kV) 

Tapping Range

Low Voltage (kV) 

3150

35~38.5

±3*2.5%

3.15
3.3
6.3
6.6
10.5
11.0

Yd11

1.80

22.20

0.50

7.0

4000

2.10

26.20

0.50

5000

2.60

30.80

0.50

6300

3.10

33.00

0.50

7.5

8000

YNd11

4.30

36.50

0.40

10000

5.10

43.20

0.40

12500

6.00

51.10

0.35

8.0

16000

7.20

63.30

0.35

20000

8.50

74.40

0.30

25000

10.10

88.00

0.30

10.0

31500

12.00

104.40

0.30

SZ22-3150~31500/35 Parameters of  On-load tap Oil-Immersed transformer(NX2)

Rated Capacity(kVA)

Voltage Combination

Vector Group

No-Load Loss (kW)

Load Loss
(kW) (75℃)

No-Load Current (%) 

Impedance (%)

High Voltage (kV) 

Tapping Range

Low Voltage (kV) 

3150

35~38.5

±3*2.5%

3.15
3.3
6.3
6.6
10.5
11.0

Yd11

2.10

22.20

0.50

7.0

4000

2.50

26.20

0.50

5000

3.00

30.80

0.50

6300

3.70

33.00

0.50

7.5

8000

YNd11

5.10

36.50

0.40

10000

6.00

43.20

0.40

12500

7.10

51.10

0.35

8.0

16000

8.50

63.30

0.35

20000

10.10

74.40

0.30

25000

11.90

88.00

0.30

10.0

31500

14.20

104.40

0.30

SZ18-3150~31500/35 Parameters of  On-load tap Oil-Immersed transformer(NX3)

Rated Capacity(kVA)

Voltage Combination

Vector Group

No-Load Loss (kW)

Load Loss
(kW) (75℃)

No-Load Current (%) 

Impedance (%)

High Voltage (kV) 

Tapping Range

Low Voltage (kV) 

3150

35~38.5

±3*2.5%

3.15
3.3
6.3
6.6
10.5
11.0

Yd11

2.60

23.50

0.50

7.0

4000

3.10

27.60

0.50

5000

3.70

32.50

0.50

6300

4.50

34.90

0.50

7.5

8000

YNd11

6.30

38.60

0.40

10000

7.40

45.60

0.40

12500

8.70

54.00

0.35

8.0

16000

10.50

66.80

0.35

20000

12.40

78.60

0.30

25000

14.60

92.90

0.30

10.0

31500

17.40

110.20

0.30

do you want to be our agent.pngWelcome to the CEEG agent team! As a national high-tech enterprise specializing in researching, developing, and manufacturing amorphous alloy dry-type transformers, epoxy resin cast dry-type transformers, and explosion-proof electrical products, we sincerely invite you to collaborate with us to explore markets and create the future together.

By joining our agent team, you will enjoy the following advantages and support:

Quality Products: Our products are manufactured with internationally advanced technology and quality assurance, widely used in various industries, providing customers with stable and efficient solutions for power transmission.

Brand Support: As an agent of CEEG, you will receive strong brand support and marketing promotion from us, helping you establish a good reputation and position in the local market.

Technical Support: We will provide professional product training and technical support to distributors, helping you better understand product characteristics and application scenarios, and improve sales capabilities.

Generous Returns: We will provide agents with competitive pricing policies and sales commissions, sharing market achievements.

If you are interested in becoming an agent of CEEG, don't hesitate to contact our official number +86 18061639839, or email us at info@ceegelectric.com to obtain an agency agreement. We look forward to cooperating with you and jointly creating a bright future!


production ability.pngCEEG production ability 21-cidu.jpgCEEG is a professional transformer manufacturer! Our production base covers an area of more than 600 acres (40 hectares) with extensive facilities and a total construction area of 180,000 square meters. We have a professional team of more than 1,000 employees. We have advanced transformer production and testing equipment here to ensure that we provide customers with high-quality power transformer products.

We boast an array of cutting-edge equipment representing a high standard within the industry, including a complete set of shearing machines, fully automated winding machines, robot-operated stacking machines, the Hedrch Vacuum Casting Equipment, vacuum impregnation systems, air cushion transport vehicles, a fully enclosed production workshop with a cleanliness level of 100,000, 20-ton vertical winding machines, 10-ton horizontal winding machines, coal-oil gas phase drying equipment, and a 200-ton overhead crane. We adopt the latest technology and processes to ensure our products comply with international standards and customer needs.

We have a strong production capacity of 30 million kVA power transformers annually. This means we can cater to all sizes and types of power transformer needs, from small applications to large energy projects. No matter what specifications our customers require, we deliver them on time and support them with high quality and reliability.

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CEEG will offer custom quotes and powerful solutions to meet your needs. Send us your details and we'll get back to you as soon as possible.

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