Product Introduction
The 35-66kV oil-immersed power transformer is a cutting-edge product that has undergone significant improvements in design, materials, structure, and craftsmanship. It features a robust construction with high and low voltage clamps using steel straps for enhanced structural integrity, increased core fastening strength, and improved resistance to transportation impact. This product excels in short-circuit resistance, low power loss, minimal noise, reliable operation, and aesthetically pleasing appearance, meeting and even surpassing the advanced levels of similar products worldwide. The main advantages are:
- Fully sealed maintenance-free design (small to medium capacity): The corrugated oil tank compensates for oil volume changes through elasticity, isolating air and moisture;
- High Short-Circuit Resistance: Dual axial and radial winding fixation meets stringent dynamic and thermal stability requirements of the power grid;
- Low-noise operation: Optimized core joints and vibration reduction structures, suitable for residential areas and urban substations;
- Full Lifecycle Energy Efficiency: S20/S22 High-Efficiency Products, 3–5 Years to Recoup the Price Difference;
- Strong adaptability: Customized for special environments such as plateaus, high humidity, severe pollution, and coastal areas.
Key Features and Specifications
|
Core component |
Technical features |
Effects |
|
Iron core |
High magnetic conductivity cold-rolled oriented silicon steel sheet, 45 ° full oblique joint, multi-stage stepped laminated sheet |
Low no-load loss, low no-load current, and low noise |
|
Winding |
Anzhe balance design, axial compression process, low-pressure foil winding/spiral structure |
Strong short-circuit resistance and uniform distribution of impulse voltage |
|
Insulation system |
Overall assembly framework, vacuum drying+vacuum oiling |
No bubbles, long insulation life, no need for hanging core inspection |
|
Oil tank |
Ripple or plate type radiator, with large capacity using bell jar type fuel tank |
Good heat dissipation, corrosion resistance, and adaptability to harsh environments |
|
Voltage regulation method |
No excitation or on load voltage regulation (± 2 × 2.5%/± 3 × 2.5%, etc.) |
Stable output voltage, adaptable to power grid fluctuations |
Technical Parameter
◆ 66kV oil-immersed three-phase double-winding unexcited voltage regulating power transformer Performance Parameter Table
|
Rated capacity (kVA) |
Voltage combination(kV) |
connection-group code |
No-load current % |
No-load loss kW |
Load loss kW |
Impedance % |
||
|
(H.V.) kV |
High voltage tapping range % |
(L.V.) kV |
||||||
|
3150 |
63 66 69 |
±5 |
6.3 6.6 10.5 |
YNd11 |
0.70 |
2.2 |
20.7 |
8.0 |
|
4000 |
0.64 |
2.6 |
24.6 |
8.0 |
||||
|
5000 |
0.54 |
3.1 |
27.6 |
8.0 |
||||
|
6300 |
±2x2.5 |
0.48 |
4.0 |
30.8 |
9.0 |
|||
|
8000 |
0.48 |
4.9 |
36.5 |
9.0 |
||||
|
10000 |
0.45 |
5.8 |
43.0 |
9.0 |
||||
|
12500 |
0.45 |
6.8 |
51.1 |
9.0 |
||||
|
16000 |
0.42 |
8.3 |
62.8 |
9.0 |
||||
|
20000 |
0.42 |
9.7 |
76.1 |
9.0 |
||||
|
25000 |
0.38 |
11.4 |
90.0 |
9.0 |
||||
|
31500 |
0.35 |
13.5 |
108.0 |
9.0 |
||||
|
40000 |
0.35 |
16.2 |
126.9 |
9.0 |
||||
|
50000 |
0.32 |
19.4 |
150.3 |
9.0 |
||||
|
63000 |
0.29 |
22.9 |
178.2 |
9.0 |
||||
◆ 35kV oil-immersed three-phase double-winding unexcited voltage regulating power transformer Performance Parameter Table
|
Rated capacity (kVA) |
Voltage combination(kV) |
connection-group code |
No-load current % |
No-load loss kW |
Load loss kW |
Impedance % |
||
|
(H.V.) kV |
High voltage tapping range % |
(L.V.) kV |
||||||
|
3150 |
35~ 38.5 |
±2x2.5 ±5 |
3.15 6.3 10.5 |
Yd11 |
0.36 |
1.7 |
20.7 |
7.0 |
|
4000 |
0.36 |
2.0 |
24.6 |
7.0 |
||||
|
5000 |
0.36 |
2.4 |
28.2 |
7.0 |
||||
|
6300 |
0.36 |
2.9 |
31.5 |
8.0 |
||||
|
8000 |
±2x2.5 |
3.15 3.3 6.3 6.6 10.5 |
YNd11 |
0.28 |
4.0 |
34.6 |
8.0 |
|
|
10000 |
0.28 |
4.8 |
40.8 |
8.0 |
||||
|
12500 |
0.24 |
5.5 |
48.4 |
8.0 |
||||
|
16000 |
0.24 |
6.7 |
59.2 |
8.0 |
||||
|
20000 |
0.24 |
7.9 |
71.6 |
8.0 |
||||
|
25000 |
0.20 |
9.4 |
84.6 |
10.0 |
||||
|
31500 |
0.20 |
11.1 |
100.8 |
10.0 |
||||
FAQs for Oil Immersed Transformer
Q1:What is an oil immersed transformer?
A:Oil immersed transformer is a type of power transformer that uses transformer oil as the main insulation and cooling medium. The iron core and winding are both immersed in an oil tank filled with transformer oil, which not only serves as insulation, but also carries heat to the tank wall through circulation and dissipates it.
Q2: What are the commonly used rated voltage levels?
A:10kV/0.4kV is the most commonly used, and there are also high-voltage models such as 35kV and 110kV.
Q3: What is the main function of the transformer oil?
A: Four core functions: insulation, heat dissipation, arc suppression, and moisture prevention.
Q4: Do oil immersed transformers need regular maintenance?
A: Yes. Regularly check the oil level, oil color, sealing, wiring terminals, and insulation resistance.
Q5: What are the hazards of low oil level?
A: Insulation degradation and internal moisture can easily lead to discharge and short circuit faults.
Q6: What is the problem with oil turning black?
A: Internal overheating, insulation aging, or local short circuit require laboratory testing, oil change, and maintenance.
Q7: Is abnormal noise normal during operation?
A: A slight and uniform buzzing sound is normal; Collisions and harsh noises are considered faults.
Q8: What are the cooling methods for oil immersed transformers?
A:ONA; ONAF and OFAF/OFAF.
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