The low-voltage side of three-phase full-wave rectifier of ZS series oil-immersed transformer adopts bridge rectifier, so the capacity of high and low-voltage winding is equal. The six-phase double-inverted-star rectifier is an ac power supply supplied to the rectifier by six low-voltage power sources with phase difference of 60 degree instead of three-phase power sources. There are three - phase five - column six - phase rectifier transformers with balanced reactor and non - balanced reactor.

The body adopts a new insulating structure to improve the resistance to short circuit. The core is made of high quality cold rolled silicon steel sheet. The high voltage winding is made of high quality oxygen-free copper wire with multi-layer circular structure. All fasteners are specially relaxed.

Using the principle of extended triangle phase shift, rectifier transformers with equivalent phase number of 9 and 12 can be constructed through multiple secondary windings with different phase shift angles.

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