The SZ11 series oil-immersed power transformer are more advanced in design. The material, the structure and process has been improved greatly. Having beautiful appearance, reliable operation, low loss and low noise, the transformer reaches the advanced level compared with similar foreign products. The SZ11 series can adjust voltage manually, electrically or automatically in a side with the help of OLTC on the voltage regulating range, so as to ensure the stability of the output voltage.
1. The transformer body adopts a new insulation structure, which improves the short-circuit resistance.
2. The transformer core is made of high-quality cold-rolled silicon steel sheets with high magnetic conductivity.
3. The transformer core consists of high/low-voltage windings are selected high-quality oxygen-free copper wire, and multi-layer cylindrical structure. 4. All fasteners with special anti-loosening treatment.
5. The oil tank is corrugated structure, the cover and the edge of the box are completely welded or fastened with bolts in two types, which fundamentally prolongs the service life of the transformer oil and insulating materials.
6. The transformer has a full range of protection devices, safe and reliable.
The above standards are subject to the latest released information; Equipment requirements should be based on the corresponding latest national professional standards.
Product parameters
SZ11 series 35KV 2000KVA-20000KVA three-phase two-winding OLTC distribution transformer
| Rated Capacity(kVA) |
Voltage Combination and Tap Range |
Vector Group Symbol |
No-load Loss |
Load Loss |
Impedance Voltage |
No-load Current |
| High Voltage(KV) |
High VoltageTap Range(%) |
Low Voltage(KV) |
W |
W |
% |
% |
| 2000 |
35 |
±3×2.5% |
6.3
10.5 |
Yd11 |
2300 |
19200 |
6.5 |
0.5 |
| 2500 |
2720 |
20600 |
0.5 |
| 3150 |
35-38.5 |
3230 |
24700 |
7.0 |
0.5 |
| 4000 |
3870 |
29100 |
0.5 |
| 5000 |
4640 |
34200 |
0.5 |
| 6300 |
5630 |
36700 |
8.0 |
0.5 |
| 8000 |
35-38.5 |
YNd11 |
7870 |
40600 |
0.4 |
| 10000 |
9280 |
48000 |
0.4 |
| 12500 |
10900 |
56800 |
0.35 |
| 16000 |
13100 |
70300 |
0.35 |
| 20000 |
15500 |
82700 |
0.35 |
| 25000 |
18300 |
97800 |
10.0 |
0.3 |
| 31500 |
21800 |
116000 |
0.3 |
Note 1: For the transformer of 10.5kV at low voltage side, products with vector group symbol as Dyn11 can be provided.
Note 2: The maximum tapping current is -7.5% of the tap position.
Note 3: When the annual average load rate of the transformer is 35% to 45%, adopting the loss value in the table can obtain the highest operating efficiency.
Environmental conditions
Normal ambient condition
1. High ambient temperature:+40ºC
2. Low ambient temperature: -25ºC
3. Maximum daily average temperature:+30ºC
4. Maximum annual average temperature:+20ºC
5. Altitude: <1000m
Special ambient condition
1. High ambient temperature:+40ºC
2. Low ambient temperature: -45ºC
3. Altitude: >1000m
According to user requirements, transformers can be operated under special conditions.
Implementation standards
1. GB1094.1-2-2013 Power Transformer
2. GB/T6451-2015 Three-phase oil-immersed transformer technical parameters and requirements
3. GB1094.3-2017 Power Transformer
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Company profile
Xuzhou Wojifan Electrical Equipment Co., Ltd. Was established in August 2024. The address is located in Pizhou Electronics Industrial Park, Jiangsu Province. Located at the junction of Jiangsu, Shandong, Henan and Anhui provinces, the transportation is extremely convenient and the transportation conditions are unique.
Xuzhou Wojifan Electrical Equipment Co., Ltd. Mainly produces S13, S20, S22 series 10KV, 20KV, 35KV oil-immersed power transformers; SH15 amorphous alloy transformer; SCB12, SCB13, SCB14, SCB18 series 10KV, 20KV, 35KV epoxy resin cast dry type power transformers; SCBH15 amorphous alloy transformer; SGB series non-encapsulated dry power transformer, low loss power transformer such as on-load voltage regulation; Combined American type, box-type substation, etc. The technical standard strictly adopts the international GB10941-2013; GB/T6451-2015, GB/T1094.11-2007/GB/T10228-2015 standards.
Our advantages
Our company has won the trust and support of our customers with its excellent quality, comprehensive service and honest cooperation. In addition to the domestic market, our products are exported to Central Europe, Eastern Europe, Southeast Asia, the Middle East, Africa, America, Australia and other regions and countries.
In line with the principle of integrity and honesty, we provide perfect services for new and old customers, so that you can get affordable products, assured equipment and thoughtful service. We provide you with professional technical solutions and services. If you have any problem, please feel free to contact us and our technicians will find a complete solution for you.
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