220kv Oil-immersed Power Transformer

Product Overview

The 220kV three-phase oil-immersed power transformer is designed for high-voltage power transmission, regional power grid interconnection and large-scale power transformation applications. As an important primary electrical equipment in 220kV substations and transmission networks, it is mainly used for voltage step-up and step-down to achieve efficient and reliable transmission and distribution of electrical energy.

220kV oil-immersed power transformers are widely used in regional substations, power plants, industrial and mining enterprises, public power facilities and renewable energy grid connection projects. They are suitable for applications requiring stable voltage conversion and continuous operation under demanding power system conditions.

Maximum Capacity: Up to 200MVA
Voltage Class: 220kV
Efficiency Rate: More than 99%, according to the product information provided
Design Lifespan: More than 30 years
Voltage Regulation: Non-excitation voltage regulation or on-load voltage regulation according to project requirements
Cooling Options: Available according to transformer capacity and operating conditions
Fastest Delivery: Normal delivery period is approximately 90 days; the shortest delivery cycle can be approximately 50 days depending on project requirements and production scheduling.

HENGFENGYOU 220kV power transformers have accumulated application experience in more than 50 countries and regions, with products supplied to markets including Tanzania, Zimbabwe, Ghana, South Africa, Kenya, Zambia, Sudan, Libya, Congo, the United Arab Emirates, Saudi Arabia, Iraq, Syria and Bangladesh.

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Product Advantages

Technical Standards & Global Certification

HENGFENGYOU 220kV oil-immersed power transformers can be designed and manufactured according to a range of international and regional technical standards to meet different power grid and project requirements.

International Standards:
GB, IEC, GOST, EN, NF, ANSI/IEEE, with customized design available according to customer technical specifications.

Product Certifications:
ISO, CE, IEC, SABS, COC, CSA and UL.

The applicable standard and certification configuration can be selected according to the destination market, grid connection requirements and project-specific technical documents.

High Grid Adaptability & Stable Operation

220kV transformers are critical equipment in regional transmission networks and substations. HENGFENGYOU provides transformer configurations adapted to different power transmission and transformation applications.

The products are suitable for:

• Regional 220kV substations
• Power plant booster stations
• High-voltage transmission networks
• Industrial and mining power systems
• Public power facilities
• Wind and photovoltaic grid connection projects
• Regional power grid upgrading projects

The transformer configuration can be optimized according to the rated capacity, voltage ratio, winding arrangement, voltage regulation requirements, cooling system and operating environment.

High-Efficiency Power Transmission

According to the available product information, the efficiency of the 220kV transformer can exceed 99% and is designed to meet the stated European energy-efficiency requirements.

Optimized transformer design helps reduce power losses during long-term transmission and transformation, making the equipment suitable for high-capacity power grid applications where operating efficiency and energy consumption are important considerations.

Environmentally Friendly & Sustainable Design

For projects with higher environmental requirements, FR3 environmentally friendly insulating oil and recyclable materials can be considered according to project specifications.

The use of environmentally friendly insulation solutions can help reduce the environmental impact of transformer operation while supporting customers' sustainability and low-carbon development objectives.

Multiple Transformer Configurations

HENGFENGYOU provides different 220kV transformer configurations according to power system requirements.

Available solutions include:

• 220kV three-phase double-winding transformer
• 220kV three-phase three-winding transformer
• 220kV autotransformer
• 220kV double-winding non-excitation voltage regulating transformer
• 220kV double-winding on-load voltage regulating transformer
• 220kV three-winding non-excitation voltage regulating transformer
• 220kV three-winding autotransformer
• 220kV three-winding on-load voltage regulating transformer

Different winding structures and voltage regulation methods can be selected according to the voltage levels, power transmission structure and operating requirements of the project. The source material specifically identifies double-winding, three-winding and autotransformer configurations.

Long-Term Operation & Global Project Experience

HENGFENGYOU has accumulated extensive 220kV transformer project experience in power grid transformation and renewable energy access applications.

The product is designed for a service life of more than 30 years, subject to appropriate installation, operation and maintenance conditions.

The transformer has been supplied to customers in more than 50 countries and regions, providing practical project experience for different power system environments.

Flexible Delivery Capability

The standard delivery period is approximately 90 days.

For urgent projects, the delivery cycle can be shortened to approximately 50 days, depending on the final technical specification, component supply, testing requirements and factory production schedule.

Why Choose HENGFENGYOU for Your 220kV Transformer Projects?

Customized Engineering & Technical Solutions

220kV power transformers are normally customized according to the requirements of the complete power system rather than selected solely according to rated capacity.

HENGFENGYOU can develop transformer solutions according to:

• Rated capacity
• Primary and secondary voltage
• Voltage ratio
• Winding configuration
• Connection symbol
• Short-circuit impedance
• No-load and full-load losses
• Voltage regulation requirements
• Cooling requirements
• Installation environment
• Customer technical specifications

This allows the transformer configuration to be adapted to regional substations, power plants, industrial power systems and renewable energy projects.

Flexible Winding Configurations

Different power system structures require different transformer configurations.

Double-winding transformers are suitable for conventional two-voltage-level power transmission and transformation.

Three-winding transformers can connect three voltage levels and are suitable for substations requiring multi-voltage-level power conversion.

Autotransformers are suitable for interconnection between voltage systems with relatively close voltage levels and can provide a more compact solution for certain high-capacity transmission applications.

The appropriate structure is selected according to the customer's system design and technical requirements.

Non-Excitation & On-Load Voltage Regulation

HENGFENGYOU provides both non-excitation and on-load voltage regulating configurations.

Non-excitation voltage regulation is suitable for systems where voltage adjustment is performed when the transformer is de-energized.

On-load voltage regulation is suitable for power systems requiring voltage adjustment while the transformer remains energized and carrying load.

The tap range and tap changer configuration can be customized according to project requirements.

Comprehensive High-Voltage Testing

220kV transformers require comprehensive factory testing before shipment.

The testing program can be arranged according to applicable standards and customer technical specifications. Depending on project requirements, testing may include:

• Lightning impulse testing
• Temperature rise testing
• Partial discharge testing
• Insulation performance verification
• Routine electrical tests
• Factory acceptance testing

The testing scope can be coordinated according to the applicable IEC, GB, GOST, EN, NF or ANSI/IEEE requirements.

Global Export & Technical Support

With experience serving more than 50 countries and regions, HENGFENGYOU provides technical support throughout the transformer project lifecycle.

Services can include:

• Technical specification confirmation
• Transformer engineering design
• Production coordination
• Factory testing
• Export packaging
• International logistics coordination
• Installation and commissioning guidance
• Operation and maintenance support

Product Parameters

220kV Double-Winding Non-Excitation Voltage Regulating Power Transformer

Rated Capacity (kVA)	HV (kV)	LV (kV)	Connection Symbol	No-Load Loss (kW)	Full-Load Loss (kW)	Impedance (%)	No-Load Current (%)
31500	220 / 242±2×2.5%	6.3 / 6.6 / 10.5 / 11	YNd11	35	135	12-14	0.70
40000	220 / 242±2×2.5%	41	YNd11	35	157	12-14	0.70
50000	220 / 242±2×2.5%	49	YNd11	35	189	12-14	0.65
63000	220 / 242±2×2.5%	58	YNd11	35	220	12-14	0.65
75000	220 / 242±2×2.5%	10.5 / 11 / 13.8	YNd11	35	250	12-14	0.60
90000	220 / 242±2×2.5%	77	YNd11	35	288	12-14	0.55
120000	220 / 242±2×2.5%	94	YNd11	35	345	12-14	0.55
150000	220 / 242±2×2.5%	11 / 13.8 / 15.75 / 20	YNd11	35	405	12-14	0.50
180000	220 / 242±2×2.5%	128	YNd11	35	459	12-14	0.46
240000	220 / 242±2×2.5%	160	YNd11	35	567	12-14	0.42
300000	220 / 242±2×2.5%	15.75 / 18 / 20	YNd11	35	675	12-14	0.38
360000	220 / 242±2×2.5%	217	YNd11	35	774	12-14	0.38

220kV / 66kV Double-Winding Non-Excitation Voltage Regulating Power Transformer

Rated Capacity (kVA)	HV (kV)	LV (kV)	Connection Symbol	No-Load Loss (kW)	Full-Load Loss (kW)	Impedance (%)	No-Load Current (%)
31500	220 / 242±2×2.5%	63 / 66 / 69	YNd11	38	151	12-14	0.89
40000	220 / 242±2×2.5%	45	YNd11	38	176	12-14	0.89
50000	220 / 242±2×2.5%	53	YNd11	38	211	12-14	0.82
63000	220 / 242±2×2.5%	63	YNd11	38	247	12-14	0.82
90000	220 / 242±2×2.5%	83	YNd11	38	323	12-14	0.75
120000	220 / 242±2×2.5%	102	YNd11	38	387	12-14	0.75
150000	220 / 242±2×2.5%	122	YNd11	38	453	12-14	0.68
180000	220 / 242±2×2.5%	138	YNd11	38	513	12-14	0.68
240000	220 / 242±2×2.5%	171	YNd11	38	635	12-14	0.61

220kV Double-Winding On-Load Voltage Regulating Power Transformer

The 220kV double-winding on-load voltage regulating transformer is designed for power systems requiring continuous voltage adjustment during operation.

The available technical configurations cover voltage combinations including 220kV / 242kV on the high-voltage side and low-voltage levels such as 6.3kV, 6.6kV, 10.5kV, 11kV, 35kV, 37kV and 38.5kV, depending on the rated capacity and project requirements.

220kV Three-Winding Non-Excitation Voltage Regulating Power Transformer

The three-winding configuration provides high-voltage, medium-voltage and low-voltage windings for multi-voltage-level power transformation.

The available technical range includes:

• HV: 220kV / 242kV
• MV: 69kV / 115kV / 121kV
• LV: 6.3kV / 6.6kV / 10.5kV / 11kV / 35kV / 37kV / 38.5kV

Rated capacities in the listed technical data range from 31.5MVA to 300MVA.

220kV Three-Winding Autotransformer

The 220kV three-winding autotransformer is designed for applications requiring efficient interconnection between high-voltage and medium-voltage systems.

The listed technical specifications cover rated capacities from 31.5MVA to 240MVA, with voltage combinations including 220/242kV on the high-voltage side and 115/121kV on the corresponding voltage level.

The exact voltage ratio, impedance and other parameters can be customized according to the project power system.

220kV Three-Winding On-Load Voltage Regulating Power Transformer

The three-winding on-load voltage regulating transformer is suitable for substations and transmission systems requiring continuous voltage regulation across multiple voltage levels.

The available technical data covers capacities from 31.5MVA to 240MVA, with voltage configurations including 220/242kV, 69/115/121kV and corresponding lower-voltage combinations.

The tap range and voltage regulation configuration can be customized according to the customer's grid requirements.

Ordering Instructions

To prepare an accurate technical proposal and quotation for a 220kV power transformer, please provide the following information:

• Main transformer parameters: rated capacity, primary and secondary voltage, voltage ratio, frequency, connection symbol, impedance, no-load loss, load loss and other required electrical parameters.
• Voltage regulation: non-excitation voltage regulation or on-load voltage regulation, including tap range and tap position if applicable.
• Transformer configuration: double-winding, three-winding or autotransformer.
• Cooling requirements: required cooling method according to rated capacity and operating conditions.
• Operating environment: altitude, ambient temperature, humidity, installation location, pollution level and other environmental conditions.
• Applicable standards: IEC, GB, GOST, EN, NF, ANSI/IEEE or customer-specific standards.
• Certification requirements: required certificates, inspection standards and project approval requirements.
• Other customization requirements: tap changer, bushings, radiator configuration, oil conservator, protection devices, paint/color, accessories and other project-specific requirements.
• Quantity: The minimum order quantity is 1 set.
• Delivery: Normal delivery period is approximately 90 days; urgent delivery can be discussed according to the final specification and factory production schedule.

For a customized 220kV transformer quotation, please send your rated capacity, voltage ratio, voltage regulation method, cooling method and applicable technical standard. Our engineering team can prepare a corresponding technical solution based on your project requirements.

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