Cradle to Gate
Identity ID
16c2bace-849e-4a51-894e-4b3246102851
Materials
Associated ID
647d82f0-f0be-4388-975c-bfabf1d116b3
Included activities starts
Included activities ends
Description
The product represented by this dataset is an oil-immersed power transformer, namely a liquid-immersed power transformer using insulating oil as the insulating and cooling medium, with a functional unit of 1 kg, mainly composed of an iron core, high- and low-voltage coils (wound from paper-wrapped copper wire), an oil tank and insulating oil, etc., manufactured through processes such as iron core fabrication, coil winding, body manufacturing and oil tank assembly. The key upstream raw materials of this product are silicon steel, paper-wrapped copper wire, oil tank plates and insulating oil, etc., and the downstream is mainly applied to the power transmission and distribution of various power systems. As for the system boundary, infrastructure such as the manufacture of production equipment and plant construction is not included within the dataset boundary. In terms of data sources and data processing, the data inventory is formed by merging data from multiple sources, and energy such as electricity is calculated using China's average energy mix.
Activity Description
The system boundary is the cradle-to-gate of the oil-immersed power transformer. The starting point is the input of raw materials, and the end point is the delivery of the finished product from the factory. The main stages include core manufacturing (silicon steel, etc.), coil winding (high-voltage coil, low-voltage coil, etc.), active part manufacturing (tank, etc.), and tank assembly (insulating oil, etc.).
Process Description
Power transformer refers to a static device with two or more windings. It converts the AC voltage and current of one system into the AC voltage and current of another system at the same frequency through electromagnetic induction to transmit electric energy. Usually the voltage and current values on both sides are different. According to the insulation medium, it can be divided into liquid-immersed type, dry type and gas-filled type. Liquid-immersed power transformer refers to a transformer in which the iron core and windings are immersed in liquid; oil-immersed power transformer is a type of liquid-immersed type, with insulating oil as the liquid. It is mainly composed of iron core, high and low voltage coils (made of copper wire wrapped with paper insulation), oil tank and insulating oil. It is in the form of bench-mounted or cabinet-mounted transformer and is widely used in power transmission and distribution of various power systems.
Time period
2022
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The production of oil-immersed power transformers mainly includes core manufacturing, coil winding, active part assembly, and oil tank assembly. The silicon steel sheets are processed and stacked to form the core; the paper-insulated copper wires are continuously wound into high-voltage and low-voltage coils by a coaxial winding machine. After drying at a constant temperature, the coils are coaxially assembled with the core, and the core-and-coil assembly is pressed and secured, then placed into a tank for vacuum drying. The oil tank plates are welded, sandblasted, leak tested, washed, and dried. The active part is then lifted into the tank, the tank is evacuated and filled with insulating oil, and left to stand for leak detection. The cover is closed and accessories are fitted. After passing all tests, the transformer is shipped out.