Product Introduction
The 20 MVA power transformer was delivered to South Africa in 2022.The power transformer is used in the substation, the purpose is making transformer up to 100MVA 220KV.
The rated power of the transformer is 20000 kVA with ONAN/ONAF cooling, the primary voltage is 66 kV with ‘-10% to +10% % tapping range(OLTC), the secondary voltage is 11 kV, they formed a vector group of YNd11.
The 20 MVA power transformer was designed with advanced technology and adopts high quality material and components which result in reliable quality and long operation time.
We ensure that each one of our delivered units has undergone rigorous full acceptance testing. We provide one-package service from consulting, quoting, manufacturing, installation, commissioning, training to after sale services, our products are now operating in more than 50 counties in the world. We aim to be your most reliable supplier as well as your best partner in business!
Scope of Supply
Product: Oil Immersed Power Transformer
Rated Power: Up to 200 MVA
Primary Voltage: Up to 230 KV
Technical Data Sheet
20 MVA transformer specification and data sheet
| Delivered to | South Africa |
| Year | 2022 |
| Model | SFZ11-20 MVA-66/11KV |
| Type | Oil Immersed Power Transformer |
| Standard | IEC60076 |
| Rated Power | 20 MVA |
| Frequency | 50 HZ |
| Phase | Three |
| Cooling Type | ONAN/ONAF |
| Primary Voltage | 66 KV |
| Secondary Voltage | 11 KV |
| Winding Material | Copper |
| Vector Group | YNd11 |
| Impedance | 8% |
| Tap Changer | OLTC |
| Tapping Range | ‘-10% to +10% % |
| No Load Loss | 20 KW |
| On Load Loss | 105 KW |
| Accessories | Standard Configuration |
| Remarks | N/A |
20 MVA-66/11KV Power Transformer Drawing
20 MVA power transformer diagram drawing and size.
20 MVA-66/11KV Transformer Manufacturing Process
Transformer Construction of the Core:
Transformer windings:
Windings are key components of the transformer, they are made of high-quality oxygen free copper, with our advanced technology and experience, our windings have the following features:
1. The windings are able to withstand lighting overvoltage, transient overvoltage, longtime overvoltage.
2. High heat resistant strength, it’s able to continuous working over 20 years under the heat generate by current.
3. The windings are able to withstand the short-circuit current.
4. High mechanical strength.
20MVA Transformer Oil Tank
Final Assembly：
The wound coils are placed carefully in the assembled core. Insulations are given wherever required using materials like press board. The CORE bolt and tie rods are fixed in position. The Primary and Secondary windings are connected as per the requirement.
Finished 20 MVA Transformer
20 MVA-66/11KV Transformer Name Plate
20 MVA-66/11KV Transformer Testing
Packing and Delivery
Packing attention
Special attention shall be paid to the loading of the transformer when loading: due to the concentrated weight of the transformer, the concentrated load at the bottom of the ship shall be guaranteed when considering the barge to be carried, and reinforcement measures shall be taken if necessary; the bumping wave of the ship shall be taken into consideration in water transportation, and the binding must be firm.
Why does transformers need tap changer?
Although power systems have a rated voltage, but they often operate at voltages slightly above or below this voltage. This deviation from the rated voltage on the primary side of the transformer is seen on the secondary side of the transformer. Transformers are normally provided with taps to adjust the turns ratio to compensate for this supply variance. This will allow the output voltage to be closer to the rated output voltage when the input voltage is off rated voltage.
FAQ
1. What is the scope of your supply?
We can supply distribution transformers up to 5000KVA 35KV, power transformers up to 200 MVA 230KV, dry type transformers up to 10 MVA 35KV, and other special transformers such as rectifier transformer and furnace transformers.
2. What service can you provide?
We can provide design, manufacturing, delivery, installation, commissioning, after-sale service.
3. Can I visit your company?
You are welcomed to visit our company at any time, contact us to get start the journey.
