The core of 110kV power transformer is high quality silicon steel, with several layers lapped. It is low loss, low noise, and anti-shortcut etc. Now it is wildly used in power station, power plant, and gets high praise from them. In 1997, SFSZ9-31500/110 on-load voltage-regulated transformer has passed the test by ministry of mechanical industry.

Main functions and characters:
- Bell type tank and the wave form shell.; Increase the strength of oil box, beautiful appearance;
- Core is with D shape yoke, 45 angle seaming;
- Core and oil box are well fixed and well protected on moving;
- Reasonable wrapping method, in the interior and exterior structure of coil; Use support; Hard paper bucket between coils increases the capacity of anti-shortcut;
- Advanced assembling method such as cold pressing and welding technology, installing with sets of coil, paper bucket production.