750kV on-load tap-changing single-phase autotransformer

ODFPSZ-700000/750
This product is a single-phase oil-immersed autotransformer with on-load tap-changer, independently developed and designed by TBEA. It adopts neutral point variable magnetic flux tap-changer and consists of two parts: the main transformer and the tap-changer compensation transformer. After being connected and combined through external bushings, the main transformer and the tap-changer compensation transformer can be used as a complete transformer, or the main transformer can be used alone. This product is one of the key equipment in large converter stations, and its function is to connect power grids of different voltage levels. By adjusting the output voltage, it can meet the needs of the power system.

Product Advantages
The main transformer and the voltage regulation and compensation transformer can be used in combination, or the main transformer can be used alone.
By adopting variable magnetic flux voltage regulation, the impact of low voltage fluctuations in the power grid is effectively reduced.
The transformer adopts a single-phase structure, facilitating transportation and lifting.
Safe and stable, reliable operation.
Application Scenarios
This product can be applied in large converter stations, step-up transmission lines, and power transformation lines, providing strong support for long-distance, cross-regional, and large-capacity energy transmission.
Technical Specifications

Product Model	–	ODFPSZ-700000/750
Rated capacity	KVA	700000/700000/233000
Rated voltage ratio	KV	（765/√3）/(530/√3±8×0.625%)/63
short-circuit impedance	%	L-M: 90% H-M: 16%(±5%) H-L: 108%
rated frequency	Hz	50
Connection group label	–	Ia0i0 (single-phase) YNa0d11 (after three-phase combination)
Insulation level	KV	SI1550LI1950AC960-LI325AC140 SI1175LI1550AC680-LI325AC140 LI/AC 325/140
cooling method	–	OFAF
No-load loss	KW	≤95
load loss	KW	≤950
Temperature Rise Limit	K	Top oil layer: 51 Winding hot spot: 61
Noise (sound pressure level)	dB(A)	≤76

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