Cradle to Gate
Identity ID
ea4618fa-072e-4d83-b5c8-4cef9f9ad500
Materials
Associated ID
2e94fadf-7cdc-4480-befc-00ac77281f6f
Included activities starts
Included activities ends
Description
The product represented by this dataset is an SF6-type power transformer, namely a power transformer using SF6 gas as the insulating medium, with a functional unit of 1 kg, mainly composed of an iron core, high-voltage windings, low-voltage windings and SF6 gas, etc., manufactured through processes such as iron core fabrication, coil winding, insulation and assembly. The key upstream raw materials of this product are silicon steel, paper-wrapped copper wire and SF6 gas, etc., and the downstream is mainly applied in power transmission and distribution. 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 covers the SF6-insulated power transformer from cradle to gate, starting with raw-material inputs and ending when the finished SF6-insulated power transformer leaves the factory. The main stages, in sequence, are core manufacture (silicon steel, etc.), coil winding (high-voltage and low-voltage coils, etc.), SF6 insulation, and assembly.
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-insulated type. SF6-type power transformer refers to a transformer that uses SF6 gas as the insulating medium. It is mainly composed of an iron core, high-voltage coil, low-voltage coil, and SF6 gas. It is in the form of a cabinet-type or pad-mounted transformer and is widely used in power transmission and distribution.
Time period
2022
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The production of SF6 power transformers mainly includes core manufacturing, coil winding, and body assembly processes. The silicon steel sheets are processed and stacked into a core. The paper-insulated copper wires are continuously wound into high- and low-voltage coils using a coaxial winding machine. After drying at a constant temperature, the coils are coaxially assembled with the core, and laminations are inserted and compressed to form the main body. The body is then vacuum dried in a tank and filled with SF6 gas. After final assembly and testing, the transformer is shipped from the factory.