EN
- EN
- RU

Inquiry

Home/Power Transformer/Oil-Immersed Transformer/220kV Power Transformer up to 360MVA

220kV Power Transformer up to 360MVA

The 220kV Oil-Immersed Power Transformer series represents our advanced engineering in extra-high voltage (EHV) equipment. These units are specifically designed for large-scale power grids, heavy industrial complexes, and major power stations. By utilizing premium-grade magnetic materials and optimized insulation structures, our 220kV transformers deliver exceptional reliability with ultra-low loss and reduced noise levels.

Get A Quote

Electrical Products

Features
Technical Specifications

Key Features of 220kV Oil-Immersed Power Transformer

Low Partial Discharge Design: The internal structure is meticulously processed in a dust-free environment to ensure partial discharge levels remain well below industry standards, extending the transformer’s service life.

Superior Short-Circuit Strength: Coils are reinforced with high-density insulation components and advanced clamping systems to withstand the mechanical stresses of sudden short-circuit events.

Optimized Magnetic Circuit: Features a high-quality, cold-rolled grain-oriented (CRGO) silicon steel core with a multi-step mitered joint structure to minimize no-load loss and magnetizing current.

Advanced Cooling & Tank Integrity: Equipped with high-efficiency cooling systems (ONAN/ONAF) and a robust, vacuum-tested bell-type tank to prevent oil leakage and ensure thermal stability under full load.

Structural & Workmanship Features

High-Precision Winding: Precise tension control during the winding process ensures tight coils and consistent impedance.

Reliable Sealing System: All gaskets and seals are made of high-quality nitrile rubber or specialized materials to ensure a 30-year maintenance-free tank seal.

Smart Monitoring (Optional): Can be equipped with online dissolved gas analysis (DGA) and fiber-optic temperature sensors for real-time health monitoring

Main Technical Parameters

Our 220kV range includes Double-winding and Three-winding configurations with On-load Tap Changers (OLTC).

220kV two-winding off-circuit tap-changer power transformer

Rated Capacity (kVA)	Voltage Combination			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
Rated Capacity (kVA)	High Voltage (kV)	HV Tapping Range	Low Voltage (kV)	Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
31500	220 242	±2×2.5%	6.3 6.6 10.5 11	YNd11	35	135	12-14	0.7
40000					41	157		0.7
50000					49	189		0.65
63000					58	220		0.65
75000			10.5 11 13.8		67	250		0.6
90000					77	288		0.55
120000					94	345		0.55
150000			11 13.8 15.75 20		112	405		0.5
180000					128	459		0.46
240000					160	567		0.42
300000			15.75 18 20		189	675		0.38
360000			15.75 18 20		217	774		0.38

220kV two-winding off-circuit tap-changer power transformer with 66kV low-voltage side

Rated Capacity (kVA)	Voltage Combination			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
Rated Capacity (kVA)	High Voltage (kV)	HV Tapping Range	Low Voltage (kV)	Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
31500	220	±2×2.5%	6.3 6.6 6.9	YNd11	38	151	12-14	0.89
40000					45	176		0.89
50000					53	211		0.82
63000					63	247		0.82
90000					83	323		0.75
120000					102	387		0.75
150000					122	453		0.68
180000					138	513		0.68
240000					171	635		0.61

220kV two-winding on-load tap-changer power transformer

Rated Capacity (kVA)	Voltage Combination			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
Rated Capacity (kVA)	High Voltage (kV)	HV Tapping Range	Low Voltage (kV)	Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
31500	220	±8×1.25%	6.3 6.6 10.5 11 35 37 38.5	YNd11	38	135	12-14	0.7
40000					45	157		0.63
50000					54	189		0.56
63000					63	220		0.56
90000			10.5 11 35 37 38.5		80	288		0.49
120000					99	346		0.49
150000					116	405		0.42
180000					135	468		0.42
120000			66 69		102	355		0.49
150000					120	415		0.42
180000					140	475		0.42

220kV three-winding off-circuit tap-changer power transformer

Rated Capacity (kVA)	Voltage combination and tap range (kV)			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)		No-load current(%)
Rated Capacity (kVA)	High Voltage (HV)	Medium Voltage (MV)	Low Voltage (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 22-24H-L 12-14M-L 7-9	H-L 22-24H-M 12-14M-L 7-9	0.7
40000					48	189			0.63
50000					56	225			0.56
63000					66	261			0.56
90000			10.5 11 13.8 35 37 38.5		86	351			0.49
120000			10.5 11 13.8 35 37 38.5		106	432			0.49
150000			11 13.8 15.75 35 37 38.5		125	513			0.42
180000					142	585			0.42
240000					176	720			0.35
300000					208	750			0.3

220kV three-winding off-circuit tap-changer autotransformer

Rated Capacity (kVA)	Voltage combination and tap range (kV)			Connection Symbol	No-load loss(kW)		Full-load loss(kW)		Short‑Circuit Impedance (%)		No-load current(%)
Rated Capacity (kVA)	High Voltage (HV)	Medium Voltage (MV)	Low Voltage (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 12-14H-L 8-12M-L 14-18	H-M 8-10H-L 28-34M-L 18-24	0.5
40000					29	26	144	121			0.5
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

220kV three-winding on-load tap-changer power transformer

Rated Capacity (kVA)	Voltage combination and tap range (kV)			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
Rated Capacity (kVA)	High Voltage (HV)	Medium Voltage (MV)	Low Voltage (LV)	Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
31500	220 ±8×1.25%	69 115 121	6.3 6.6 10.5 11 35 37 38.5	YNyn0d11	44	162	H-L 22-24H-M 12-14M-L 7-9	0.77
40000					52	189		0.7
50000					60	225		0.63
63000					70	261		0.63
90000			10.5 11 35 37 38.5		92	351		0.56
120000					115	432		0.56
150000					135	513		0.49
180000					159	630		0.49
240000					193	780		0.45

220kV three-winding on-load tap-changer autotransformer

Rated Capacity (kVA)	Voltage combination and tap range (kV)			Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
Rated Capacity (kVA)	High Voltage (HV)	Medium Voltage (MV)	Low Voltage (LV)	Connection Symbol	No-load loss(kW)	Full-load loss(kW)	Short‑Circuit Impedance (%)	No-load current(%)
31500	220 ±8×1.25%	115 121	6.3 6.6 10.5 11 35 37 38.5	YNyn0d11	25	108	H-L 28-34H-M 8-10M-L 18-24	0.56
40000					30	132		0.56
50000					36	157		0.49
63000					42	189		0.49
90000					51	247		0.42
120000			10.5 11 35 37 38.5		64	308		0.42
150000					76	365		0.35
180000					85	419		0.35
240000					104	540		0.3

Why Partner with Us?

Proven Track Record: Successfully deployed in numerous 220kV substations with zero major insulation failures reported.

Custom Engineering: We provide tailored voltage ratios and vector groups (e.g., YNyn0d11) to match specific regional grid requirements.

Global Compliance: Full adherence to international IEC and ANSI/IEEE standards for seamless integration into global energy projects.

Get in Touch with Liyond

We're here to help! Connect with our team for expert support and personalized solutions.

Related Oil-Immersed Transformer

Check out these related products you might also be interested in.

Get A Quote

110kV Oil-Immersed Power Transformer OCTC Double & Three-winding 6.3-180MVA

35kV Oil-immersed Distribution Transformer OCTC Double-Winding 50-1600kVA

110kV Oil-Immersed Power Transformer OLTC Double & Three-winding 6.3-120MVA