Products
Oil Immersed Self Cooled Hermetically Sealed Type Transformer
Whether the transformers are used for infrastructure systems, industry or households, we provide the right transformer for every need – from compact distribution transformers to limited power transformers with ratings up to 20 MVA.
Features
Products Description
Whether the transformers are used for infrastructure systems, industry or households, we provide the right transformer for every need – from compact distribution transformers to limited power transformers with ratings up to 20 MVA.
Transformers can be classified based on many factors like installation or losses which is the most important factor in the transformer.
In any electrical machine, ‘loss’can be defined as the difference between input power and output power.

Products Parameter
Common Data | Three Phase, Oil Immersed Distribution Transformers (Indoor or Outdoor Installation) | ||
Standard | - | IEC60076 | |
Rated Frequency | Hz | 60 or 50 | |
Connection and Vector Group | - | Dyn11 | |
Max. Temperature Rise | Top Oil | °C | 50 |
Average Winding | °C | 55 | |
Type of Cooling | - | ONAN | |
Rated Primary Voltage | As per customer's request | kV | Up to 36 kV |
Rated Secondary Voltage | As per customer's request | kV | Up to 13.8 kV |
HV Tapping | Off-circuit tap changer 5 positions | % | ± 2x2.5 |
Winding | - | Copper or Aluminum | |
Conductors Primary Insulation Level | LI 75 / AC 28 / Um 12 LI 95 / AC 38 / Um 17.5 LI 125 / AC 50 / Um 24 LI 170 / AC 70 / Um 36 | ||
Loss | - | As per standard | |
Application
The distribution transformer provides the final voltage transformation in the electric power distribution system, stepping down the networks medium voltage to low voltage, the level used by the consumer, and is considered one of the most important links in the distribution network.
Distribution transformers are used in the following applications:
Building Infrastructure and Industrial
Airports, hospitals, factories, shopping malls, hotels, commercial and residential towers.
Utility
Generation, transmission, distribution substations, water and waste water treatment plants.
Oil and Gas
Oil and gas plants, petrochemical plants and refineries.
Our Certificate

Project Case

Our Factory

Our factory covers an area of 33,300 square meters, with a total construction area of 6,100 square meters. There are currently 260 employees, including 18 technicians who have been engaged in the research and development of transformer products for many years, and 8 high-quality corporate managers. With the expansion of production scale and the increase of product varieties, it has now developed into a high-tech innovative enterprise that annual production capacity of more than 1000MVA, integrating the design, production and sales of open-type dry-type transformers, epoxy resin cast dry-type transformers, amorphous alloy transformers, and special transformers.
WHY HEBEI TIANWEI
1. Providing quality packaged power solutions at the shortest lead time in the industry to commercial and industrial clients.
2. Product manufacture and supply according to the highest industry quality standards – ISO 9001 and SANS.
3. We invest in keeping large quantities of standard transformers and MV switchgear in stock – we supply quickly and provide 24/7 emergency support to ensure minimal downtime.
4. Our dedicated departments, infrastructure and highly trained personnel allow fast, full on-site installation, service and supply capabilities.
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