Home > Products > Oil-immersed power transformers, voltage class 220 kV > Three-winding power transformers with OLTC, Type TDTN-25000÷63000/220-U1(UHL1)

Three-winding power transformers with OLTC, Type TDTN-25000÷63000/220-U1(UHL1)

Three-phase, three-winding power transformer with natural oil circulation and forced air circulation, featuring on-load voltage regulation (OLTC) and off-load tap changer (NLTC). Automatic control is provided via an automatic controller supplied with the transformer. Using TDTN-type transformers ensures reliable power supply throughout the entire service life.

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Description

Power range

Power range: 25000–63000 kVA
Primary winding voltage ( HV ): 158 kV
Secondary winding voltage ( MV ): 38.5 kV
Climatic design: U 1 or UHL 1

Transformer symbols

T – Three-phase transformer
D – Cooling with natural oil circulation and forced air circulation
T – Three-winding
N – Load voltage regulation (РПН)
Х – Rated power, kVA
150 – HV voltage class, kV
U1 / UHL1 – Climatic design and installation category according to ГОСТ 15150

Characteristic

Technical Specifications of Transformers Type TDTN-25000÷63000/220-U1(UHL1)
Parameter	Value
Transformer type	TDTN
Rated power, kVA	25000	40000	63000
Rated voltage of HV winding, kV	-
Rated voltage of MV winding, kV	38,5
Rated voltage of LV winding, kV	6,6; (11,0)
Winding connection scheme and vector group	Yn/Yn/D-0-11
No-load losses, kW	45	54	65
Short-circuit losses, kW	130	220	285
Short-circuit voltage HV-MV, %	12,5	12,5	11,0
Short-circuit voltage HV-LV, %	20	22,0	18,5
Short-circuit voltage MV-LV, %	6,5	9,5	6,5
No-load current, %	0,7	0,5	0,7
Dimensions, mm
L (length)	9600	9000	8400
B (width)	5150	5350	4750
H (height)	8050	7350	7200
Oil weight, kg	31000	35000	37400
Shipping weight, kg	90000	100000	105500
Total weight, kg	110000	115000	118500