Product Overview
66kV High-Voltage Oil-Immersed Transformer from Subian Electric’s Xuzhou Factory
The 66kV power transformer that uses oil for its function has a very good potential in power e.g. the transformer can be used in medium voltage networks serving industries, mining sites and transport connections continuously. The transformer has a good ability to withstand short-circuit operation as well as low losses of electricity as compared with the requirements established by the country.
Applications & circuit protection
This transformer is suitable for transmission and distribution installation for business electrical applications, city and rural agricultural distribution and infrastructure projects.
- Industrial parks: Reliable energy supply for big facilities.
- Mines: Mining operations of non-metallic and metallic substances.
- Transport: Roads, airports and railways infrastructure.
- Regional grids: Distribution and transmission facilities.
Construction & operating reliability
Superior-quality materials for core and windings, effective cooling, and strong structural design ensure great efficiency and long performance period.
- Three-phase design of 66 kV.
- Lower losses than defined by national standards.
- Strong short circuit resistance.
- Silent operation.
- Reliable support of infrastructure projects.
Technical Parameter
| Parameter | Value |
| Rated capacity range | 6300-63000 kVA |
| Voltage combination (HV) | 110 ±8×2.5% kV |
| Tap range | 36 / 37 / 38.5 kV (MV) |
| Voltage (LV) | 6.3 / 6.6 / 10.5 / 21 kV |
| Connection group | YNyn0d11 |
| No-load loss (typical range) | 8900-25000 W |
| Load loss (typical range) | 44000-300000 W |
| No-load current (typical range) | 0.4-0.76% |
| Short-circuit impedance | 10.5% (H-M) |
| Voltage level | 66 kV, three-phase |
| Application | Transmission and distribution links |
| Cooling method | Oil-immersed (ONAN) |
| Loss level | Lower than national standards |
| Short-circuit tolerance | Strong |
| Noise | Quiet operation |
| Standard | IEC 60076 / GB 1094 |
Transformer Price & Factory Quotation
As we are a factory-direct manufacturer, we price transformers depending on the rated capacity, combination of voltages, core and windings materials, accessories, and order quantity. For container orders as well as for distributor programs volume pricing is applied. Since the costs for materials move freely in the market, we provide quotations on actual prices in written form only. Ask us for a price list for High-Voltage Oil-Immersed Transformer specifying targeted capacity and quantity required.
- OEM / ODM branding does not adjust the price of a standard transformer series
- Prices for spare core, spare unit, and special packaging are given separately
- FOB / CIF / DDP terms are available for the export.
How to Connect This Transformer
Prior to applying the supply voltage to the High-Voltage Oil-Immersed Transformer, ensure that the tap position corresponds to the supply voltage to be used, as well as that the connection grouping suits your system. The connections are made as follows: high voltage bushings go to the supply side, and low voltage terminals to the load side. Earthing terminals should be properly connected to station earth in accordance with local standard.
- Verify tap position based on supply voltage
- Connect HV bushings to supply side, LV terminals to load side
- Connect earthing terminals accordingly to local standards
This Transformer vs. Alternative Ratings
Compare typical configurations to select the correct rating:
| Item | This Product | Smaller / Larger Option |
| Capacity | As specified on this page | Lower or higher kVA available |
| Voltage | As specified | Other primary voltages available |
| Impedance | Per standard / custom | Adjusted to network requirements |
| Cooling | ONAN or AN/AF per type | Forced cooling option on request |
| Application | Distribution / power | Industrial, renewable or utility |
Export Markets & Country Compatibility
We provide High-Voltage Oil-Immersed Transformer to parts dealers, power utilities and project customers in Asia, Africa, Middle East countries, Latin America and Europe. At the time of shipment we finalize the applicable voltage, frequency, connection group and certification criteria for all destinations.
Transformer Dimensions, Weight & Packing
Capacity, voltage, and type are the factors that affect dimensions as well as weight. The typical approximate dimension values for distribution ratings are as follows: 100 kVA oil immersed devices will have dimensions of approximately 1000-1200 mm for length, 500-700 mm for depth, and 1100-1400 mm for height while shipping weight is around 600-900 kg. The dimensions of larger units change also. Actual dimensions of ordered products and transportation weight are confirmed when the order is placed as well as packing according to the way of transportation.
- Dimension drawings are approved before production
- Packing is carried out according to standard with marked lifting places
- Transport method is confirmed while planning delivery
Standards & certifications
In accordance with IEC 60076 and GB 1094 standards, the transformer can be provided with results regarding type tests carried out for the project approval purpose.
- Design standard: IEC 60076 / GB 1094.
- Provision of type-test and routine-test results.
- Low-loss design confirmed.
- Documentation for approvals and certifications is available.
OEM & B2B supply support
Subian Electric produces and supplies electrical equipment and is a supplier of equipment to electric power companies, infrastructure constructors and traders.
For custom capacity, voltage equation or tap changes, please get in touch with us and understand the project we are dealing with and quantity needed.
- Sample products and technical designs are provided.
- Flexible purchasing quantity is available.
- OEM and ODM services are offered.
- Custom design and packaging of the products are available.
- Support with technical documentation and certificates is provided.
Frequently Asked Questions
What is the 66kV transformer used for?
66kV transformers are essential in the management of medium voltage networks. They work in the transmission of electricity to industrial facilities, as well as mines and transport facilities.
What makes it efficient?
Because the loss factors are below national standards, this allows to save on energy consumption costs.
Is it suitable for infrastructure projects?
66kV transformers are ideal for highways, ports, mines, as well as different industrial parks.
Do you provide test reports?
We provide type test reports and routine test reports in order to assist with project approval and product certification.
