Home > Products > 220 kV oil-immersed power transformers > TDTN-25000–63000/220-U1 (UHL1) type three-winding power transformers with on-load tap changer (OLTC)

TDTN-25000–63000/220-U1 (UHL1) type three-winding power transformers with on-load tap changer (OLTC)

Power transformer, three-phase, three-winding, with natural oil circulation and forced air cooling, equipped with on-load tap changer (OLTC) and DETC (off-circuit tap changer). Automatic control is provided by a controller supplied together with the transformer. TDTN-type transformers ensure reliable power supply throughout their service life.

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Description

Power range

Rated power range: 25000–63000 kVA
HV winding rated voltage : 158 kV
MV winding rated voltage : 38.5 kV
Climatic category: U 1 or UHL 1

Transformer symbols

T – Three-phase transformer
D – Natural oil circulation and forced air cooling
T – Three-winding
N – On-load tap changer (OLTC)
Х – Rated power, kVA
150 – HV voltage class, kV
U1 / UHL1 – Climatic category and installation type in accordance with GOST 15150

Characteristic

Technical characteristics for TDTN-25000–63000/220-U1 (UHL1) type transformers
Parameter	Value
Transformer type	TDTN
Rated power, kVA	25000	40000	63000
Rated voltage, HV winding, kV	-
Rated voltage, MV winding, kV	38,5
Rated voltage, LV winding, kV	6,6; (11,0)
Winding connection diagram 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