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Pre-expansion of power transformers: In 1882, Gonard and Gibbs' AC power supply system obtained British patents. They used a device called "2nd Generator" (with an open core, the predecessor of the transformer) to raise and lower the voltage.
The first closed iron core, a transformer with windings outside the core column, was built on September 16, 1884 by Deli, Brahsin and Zeppelowski at the Günz plant in Hungary. This transformer is a single line. The transformer, with a capacity of 1400 VA, a voltage ratio of 120/72 V and a frequency of 40 Hz, was first used in their patent application for the term "transformer".
The equipment was exhibited at the Budapest exhibition in 1885.
American Westinghouse bought several high-voltage and Gilbert AC voltage conversion devices and their group cases. Initially, the heart was mechanically and electrically described. In 1886, the first transformer for AC lighting systems was put into operation and succeeded, and this technology was then launched in a sensitive manner.
In 1890, Avery (formerly General Electric Company of Germany) Doris-Dobrowski made clear the three-phase transformer.
Since the transformer was used for lighting in 1886, the AC transmission voltage and capacity were added quickly. After the establishment of the new China in 1949, following the rapid development of the national economy, the power industry has also developed rapidly. Especially since the reform and opening up, the speed of the power industry has increased.
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