33kV Distribution Transformer
Rated Power: Up to 3150kVA (Customized)
Rated High-Voltage: Up to 35kV (Customized)
Rated Low-Voltage: 0.4kV/0.69KV (Customized)
Tap range: ±5%, ±2×2.5% (Customized)
Vector Group: Dyn11, Yyn0
Notes: The S22 series 33kV distribution transformer support full customization across all key specifications to meet specific grid and project requirements.
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of 33kv distribution transformer in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced 33kv distribution transformer from our factory. Also, quotation is available.
Product Overview
The S22 (NX1) series oil-immersed power transformer is a high-efficiency, energy-saving product engineered to meet national level-1 energy efficiency standard and compliant with IEC 60076. As a key product encouraged and prioritized for procurement by State Grid Corporation of China, it combines advanced R&D design, precision manufacturing to deliver reliable power transmission solutions for global industrial and infrastructure projects.
Core Advantages
Ultra-Low Losses, First-Level Efficiency
Optimized core and winding design significantly reduces no-load and load losses, cutting long-term operating costs and carbon emissions.
01
IEC 60076 Certified
Designed and tested in strict accordance with IEC 60076 international standards, ensuring global interoperability, safety, and quality assurance for overseas projects.
02
Proven Reliability
Stable performance under harsh operating conditions, with low partial discharge, strong short-circuit resistance, and a long service life.
03
Grid-Approved Quality
A State Grid priority-procurement product, validated through rigorous grid-level acceptance and field operation.
04
Easy Installation & Maintenance
Compact structure, accessible components, and low maintenance requirements reduce downtime and total cost of ownership.
05
With stable performance, low energy consumption, and extended service life, the S22 (NX1) series is engineered to satisfy the stringent demands of modern power supply systems and has earned wide recognition across domestic and international markets.
Meaning of Product Model
Note: More technical parameters of the transformer can not be reflected in the model, more information is required to check the technical parameters.
Product Parameter
Oil-immersed Transformer S22 (NX1) Series Product Parameter Table
|
Rated capacity (kVA) |
Level |
|||||
|
Electrical steel strip |
Amorphous alloy |
|||||
|
No-load loss (W) |
Load loss (W) |
|
Load loss (W) |
|||
|
Dyn11/Yzn11 |
Yyn0 |
Dyn11/Yzn11 |
Yyn0 |
|||
|
30 |
65 |
455 |
430 |
25 |
510 |
480 |
|
50 |
80 |
655 |
625 |
35 |
735 |
700 |
|
63 |
90 |
785 |
745 |
40 |
880 |
840 |
|
80 |
105 |
945 |
900 |
50 |
1060 |
1010 |
|
100 |
120 |
1140 |
1080 |
60 |
1270 |
1215 |
|
125 |
135 |
1360 |
1295 |
70 |
1530 |
1450 |
|
160 |
160 |
1665 |
1585 |
80 |
1870 |
1780 |
|
200 |
190 |
1970 |
1870 |
95 |
2210 |
2100 |
|
250 |
230 |
2300 |
2195 |
110 |
2590 |
2470 |
|
315 |
270 |
2760 |
2630 |
135 |
3100 |
2950 |
|
400 |
330 |
3250 |
3095 |
160 |
3660 |
3480 |
|
500 |
385 |
3900 |
3710 |
190 |
4380 |
4170 |
|
630 |
460 |
4460 |
250 |
5020 |
||
|
800 |
560 |
5400 |
300 |
6075 |
||
|
1000 |
665 |
7415 |
360 |
8340 |
||
|
1250 |
780 |
8640 |
425 |
9720 |
||
|
1600 |
940 |
10440 |
500 |
11745 |
||
|
2000 |
1085 |
13180 |
550 |
14000 |
||
|
2500 |
1280 |
13360 |
670 |
15450 |
||
Product Structure Features
A newly designed lifting arrangement and core-positioning structure is adopted.
The optimized lifting points ensure balanced load distribution during active-part hoisting.
The core-positioning structure constrains relative displacement of the active part under long-haul transportation vibration and shock, preventing core lamination loosening and lead stress accumulation - ensuring safe commissioning without requiring a cover-removal inspection upon site arrival.
Structure Diagram
Operating Environmental Conditions
|
Name |
Unit |
Standard Technical Parameters |
|
|
Ambient temperature |
Maximum daily temperature |
℃ |
45 |
|
Minimum daily temperature |
-25 |
||
|
Maximum diurnal temp range |
K |
25 |
|
|
Average temp in hottest month |
℃ |
30 (or provided by the project) |
|
|
Maximum annual average temp |
20 (or provided by the project) |
||
|
Humidity |
Average daily relative humidity |
% |
≤95 |
|
Average monthly relative humidity |
≤90 |
||
|
Height |
m |
≤1000 |
|
|
Maximum ice thickness |
mm |
20 |
|
|
The average maximum wind speed at 10m above the ground for 10 minutes |
m/s |
35 |
|
|
Installation site |
Outdoors |
||
|
Atmospheric corrosivity levels (C1/C2/C3/C4/C5/CX) |
Confirm with project unit before supply |
||
Product Application
The S22-M (NX1) series oil-immersed power transformer is widely used in various fields that require stable and efficient power supply, suitable for both industrial and civil scenarios. Its main applications include:
- Power Grid Construction: Used in power transmission and distribution systems of State Grid and local power grids, especially for urban and rural power grid upgrading projects, to improve power supply efficiency and stability.
- Industrial Parks & Factories: Suitable for large-scale industrial parks, manufacturing factories, mining enterprises, etc., providing stable power support for production equipment, ensuring continuous and efficient operation of production lines.
- Infrastructure Projects: Applied in transportation hubs (airports, railway stations), commercial complexes, high-rise buildings, and municipal engineering projects, meeting the high-demand power supply needs of public facilities and commercial buildings.
- Renewable Energy Supporting: Matched with solar power plants, wind power plants and other renewable energy projects, used for power conversion and transmission, improving the utilization rate of clean energy.
- Remote Areas & Rural Power Supply: With its stable performance and strong environmental adaptability, it is also suitable for power supply in remote areas and rural areas, solving the problem of insufficient power supply in underdeveloped regions.
Proccess of Transformer
1-Wire‑wound winding of transfomer
2-Foil‑wound winding of transfomer
3-Vacuum casting of transformer
4-Epoxy resin casting of transfomer
5-Coil assembling over core
6-HV porcelain bushings of oil immersed transformer
7-Lead insulation taping and welding of transfomer
8-Vacuum oil filling of transformer
9-Tank sealing of transformer
Testing of Transformer
1-Measurement of winding resistance testing of transformer
2-Measurement of voltage ratio and check of phase displacement testing of transformer
3-Separate‑source AC withstand voltage testing of transformer
4-Measurement of no‑load loss and no‑load current of transformer
5-Measurement of short‑circuit impedance and load loss of transformer
6-No load loss and no load current testing of transformer
7-Temperature‑rise test of transformer
8-Partial‑discharge measurement of transformer
9-Winding ressitant and voltage ratio testing of transformer
FAQ
Q1: What's the difference between power transformer and distribution transformer?
A: The power transformer operates in the transmission network, typically at 35 kV and above (66 kV, 110 kV, 220 kV, etc.) and with capacities of 5 MVA or more. Its job is to step voltage up for efficient long-distance transmission, or step it down between grid levels.
The distribution transformer sits at the end of the distribution chain, stepping medium voltage (6–35 kV) down to utilization voltage (0.4 kV / 400 V), with capacities usually up to 3150 kVA. Its load fluctuates widely throughout the day, so the design focuses on low no-load loss. It typically uses an off-circuit tap changer and natural oil cooling (ONAN), and is installed near buildings, factories, and residential areas.
In short: power transformers move bulk energy across the grid; distribution transformers deliver it to the end user.
Q2: Can the power transformer increase voltage?
A: A transformer can both step up and step down voltage, determined by the turns ratio between its primary and secondary windings. When the secondary has more turns than the primary, voltage increases; when it has fewer, voltage decreases.
Q3: What are the common voltage levels?
A: High voltage: 6kV, 6.6KV, 11kV, 22kV, 33kV; Low voltage: 0.48kV (400V), 0.66kV, 3.15kV, 6.3kV. Non-standard voltages can be customized upon request.
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