Description

220kV three-winding power transformer with Off-circuit tap-changer is a high efficiency, low loss, high capacity power transformer for high voltage level power system. The transformer has three independent windings, which are used for high voltage side, medium voltage side and low voltage side. The non-excitation voltage regulation technology is adopted to reduce the reactive power loss in the power system and improve the power factor of the system. Due to the three-winding design and non-excitation voltage regulation technology, this transformer has high efficiency and low losses, which can improve the energy utilization and economy of the power system.

Features:

1. Scientific computing tools: the transformer uses advanced electric, magnetic, thermal and mechanical computing software to calculate electro-magnetic field and magnetic flux leakage distributions, to analyze wave processes, and to select reliable insulation margin, thus to guarantee product reliability.

2. Reasonable structural layout: The transformer uses multilevel stepped lap helical structure to reduce the no-load losses and noise. Its core is supported by inside rods,and its winding uses cardboard tubes to enhance short circuits withstand capacity,we also uses baffle plate to direct the oil flow for reduction of winding temperature rise. Heterotypic radiators are applied to improve the cooling centers for reduction of oil temperature rise. All internal insulating parts and metal structural parts have round processed for reduction of partial discharge.

3. Advanced technology: Its core is automatically cut with high precision and few burrs. It works without folding the upper yoke, with surface coated double H curing adhesive and fastened. We have vertical winding machine with digital control tension device. Its active part adopts phase-assembly technology, and the lead is wholly pre-fabricated. Automatic control of Kerosene Vapor-phase drying process is used.

4. Perfect quality guarantee system: The company strictly controls the quality of products according to ISO19001 standard.

5. To meet the client’s needs, we can provide products of other voltage ratios, Vector Groups, and rated capacities, as listed in the table.

Product parameters：

220kV Three-winding Power Transformer With Off-circuit Tap Changer

Rated Capacity (kVA)	Voltage Combination (kV)			Connection Symbol	No-load Loss (kW)	Full-load Loss (kW)	Impedance (%)		No-load Current (%)
Rated Capacity (kVA)	HV	MV	LV	Connection Symbol	No-load Loss (kW)	Full-load Loss (kW)	Step-up	Step-down	No-load Current (%)
31500	220 242±2*2.5%	69 115 121	6.3 6.6 10.5 11 35 37 38.5	YNyn0d11	40	162	H-M 22-24 H-L 12-14 M-L 7-9	H-M 22-24 H-L 12-14 M-L 7-9	0.7
40000					48	189			0.63
50000					56	225			0.56
63000					66	261			0.56
90000					86	351			0.49
120000			10.5 11 13.8 35 37 38.5		106	432			0.49
150000			10.5 11 13.8 35 37 38.5		125	513			0.42
180000			11 13.8 15.75 35 37 38.5		142	585			0.42
240000					176	720			0.35
300000					208	750			0.30

220kV Three-winding Auto-Transformer With Off-circuit Tap Changer

Rated Capacity (kVA)	Voltage Combination (kV)			Connection Symbol	No-load Loss (kW)		Full-load Loss (kW)		Impedance (%)		No-load Current (%)
Rated Capacity (kVA)	HV	MV	LV	Connection Symbol	Step-up	Step-down	Step-up	Step-down	Step-up	Step-down	No-load Current (%)
31500	220 242±2*2.5%	115 121	6.6 10.5 11 35 37 38.5	YNyn0d11	25	22	117	99	H-M 12-14 H-L 8-12 M-L 14-18	H-M 8-10 H-L 28-34 M-L 18-24	0.50
40000					29	26	144	121			0.50
50000					34	30	170	144			0.43
63000					40	36	201	171			0.43
90000					50	46	276	234			0.36
120000			10.5 11 13.8 15.75 18 35 37 38.5		62	56	340	288			0.36
150000					70	60	405	342			0.33
180000					80	72	464	387			0.33
240000					95	86	595	504			0.25

Application：

Packaging and Transportation：

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220kV Three-winding Power Transformer With Off-circuit Tap-changer