Home > Products > Power transformers, oil-immersed, voltage class 35 kV > Energy-efficient two-winding power transformers with split LV windings and on-load tap-changer (OLTC), type TRDNS-25000/35-U1(UHL1), featuring reduced losses

Energy-efficient two-winding power transformers with split LV windings and on-load tap-changer (OLTC), type TRDNS-25000/35-U1(UHL1), featuring reduced losses

The power transformer is a three-phase, double-winding, oil-filled type with natural oil circulation and forced air circulation, equipped with an on-load tap changer (OLTS). Automatic control is carried out by an automatic controller supplied together with the transformer. It is intended for use in the auxiliary power systems of power plants. The use of a TRDNS-type transformer ensures reliable power supply to the consumer throughout the entire service life.

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Description

Power range

Power rating: 25000 kVA.
Primary winding voltage HV: 36.75 kV.
Climatic design: U1 or UHL1.

Transformer symbols

Т – Three-phase transformer.
R – Equipped with split LV winding.
D – Natural oil circulation with forced air circulation.
N – On-load voltage regulation (OLTC).
S – Designed for auxiliary power systems of power plants.
Х – Rated power, kVA.
35 – Voltage class, kV.
U1 or UHL1 – Climatic version and installation category according to ГОСТ 15150.

Characteristic

Technical Specifications of Energy-Efficient, Low-Loss TRDNS-25000/35-U1(UHL1) Transformers
Transformer type	Rated power, kVA	Rated voltage, kV		Winding connection scheme and vector group	Losses, kW
		HV	LV		No-load	Short-circuit
TRDNS-25000/35	25000	36,75 35	6,3-6,3 6,3-10,5; 10,5-10,5	Yn/D-11-11	16	105

Overall and Mounting Dimensions

Overall Dimensions of TRDNS-25000/35-U1 (UHL1) Transformers
Transformer type	Short-circuit voltage, %			No-load current, %	Weight, kg
Transformer type	ВН-НН1+НН2	ВН-НН1 или ВН-НН2	НН1-НН2	No-load current, %	Total weight	Transport weight	Oil weight
TRDNS-25000/35	10,5	23	не менее 40	0,3	42795	37650	9660