Split series combined voltage transformer

The invention discloses a split series combined voltage transformer. By employing the principle of a series voltage summation method, a primary winding of a non-standard voltage class 420 kV higher standard voltage transformer is connected with a primary winding of a 330 kV lower standard voltage transformer in series to form a primary winding of a combined voltage transformer, a primary winding of a high voltage isolation transformer is connected with a secondary winding of the 420 kV higher standard voltage transformer in series, and a secondary winding of the high voltage isolation transformer is connected with a secondary winding of the 330 kV lower standard voltage transformer in series so that a secondary winding of the combined voltage transformer is formed. The higher and lower standard voltage transformers are split and independent, the 420 kV higher standard voltage transformer can be lifted to a security height via an electric hydraulic system and forms a 750 kV standard voltage transformer with the 330 kV lower standard voltage transformer, and the 330 kV lower standard voltage transformer can work independently and reliably.