Our 20MVA 34.5 to 69kV Oil Immersed Power Transformer has duplex winding, and with the On-load tap changer (OLTC) on the H.V. side. This transformer model is meticulously crafted to deliver superior performance in critical environments such as power plants, substations, and large-scale industrial settings in sectors such as mining and petrochemicals.
This high power transformer is engineered to withstand high short-circuit currents, ensuring robust mechanical performance and reliability under stressful conditions. Optimized design minimizes energy loss, reduces partial discharge occurrences, and operates quietly, meeting stringent performance requirements. Constructed with a focus on sealing integrity for safe deployment and maintenance-free handling, ensuring operational reliability. Features an advanced structural design that facilitates straightforward maintenance procedures, optimizing operational efficiency and life-cycle management.
Max. Ambient Temperature |
40℃ |
Altitude Above Sea Level |
≤1000m |
Wind Speed |
≤35 m/s |
Earthquake Acceleration |
horizontal acceleration ≤0.3g |
Vertical Acceleration |
≤0. 15g |
Special Conditions |
customized products are available. |
Frequency |
50Hz or 60Hz |
Power (KVA) |
Voltage Combination |
Vector Group |
NL Loss (KW) |
L Loss (KW) |
NL Current (%) |
Impendence (%) |
|
High Voltage (KV) |
Low Voltage (KV) |
||||||
10000 |
69 |
6.3 |
YNd11 |
12.1 |
47.6 |
0.75 |
9 |
12000 |
12.6 |
56.5 |
0.53 |
||||
15000 |
15.1 |
69.5 |
0.49 |
||||
20000 |
17.9 |
84.2 |
0.49 |
||||
25000 |
21.1 |
99.5 |
0.42 |
||||
30000 |
25.1 |
120 |
0.42 |
||||
37500 |
30 |
140.3 |
0.39 |
||||
50000 |
35.4 |
174.3 |
0.39 |
||||
60000 |
42.1 |
210 |
0.39 |

Engineered for high voltage conversion, the 20MVA 34.5 to 69kV Oil Immersed Power Transformer ensures efficient electricity transmission over long distances, reducing energy loss and optimizing power distribution.
2. Sturdy and Reliable Design
Built to strict IEC standards, this transformer ensures reliable performance in challenging environments with minimal maintenance needs, optimizing operational efficiency and reducing costs.
3. Enhanced Safety Measures
With advanced safety features including overload, short circuit, and over-voltage protection, this power transformer ensures optimal operational safety for equipment and personnel.
The 20MVA 34.5 to 69kV Oil Immersed Power Transformer promotes sustainability by utilizing eco-friendly materials and processes, minimizing environmental impact throughout its life-cycle, in line with global efforts for a greener future.


1. Industrial Sector
34.5 to 69kV Oil Immersed Power Transformer can be used in industrial production for power supply and distribution systems, providing stable and reliable electricity to various types of equipment and machinery.
2. Utility Sector
It is applicable to utility sectors such as power companies, transmission and distribution networks, ensuring efficient and secure power transmission.


3. Wind and Solar Energy Projects
It can be used in wind and solar power plants to convert renewable energy into reliable electricity and feed it into the grid for user consumption.
1. OEM: Offers customized designs to manufacture power transformers according to specific customer requirements.
2. Technical Support: Provide pre-sale consultation and after-sales technical support to ensure optimal performance and customer satisfaction.
We are committed to providing efficient and reliable power transformer solutions, helping customers achieve long-term stable operation and economic benefits in various power demand scenarios.
https://www.hentg-elec.com/