Product Overview

The 110kV oil-immersed power transformer is designed for regional power transmission and distribution networks, industrial substations, power generation projects and renewable energy grid-connection applications. As an important voltage conversion device between high-voltage transmission systems and medium-voltage distribution networks, it provides reliable and efficient power transfer for utilities, industrial facilities and large-scale energy projects.

HENGFENGYOU ELECTRIC develops 110kV transformers with flexible voltage ratios, capacity configurations and winding arrangements to meet different grid structures and project requirements. Depending on the application, the transformer can be supplied as a three-phase double-winding transformer, three-phase three-winding transformer or autotransformer.

Typical applications include regional grid substations, industrial parks, steel and chemical plants, mining projects, photovoltaic and wind power substations, power plant step-up stations and urban power infrastructure.

Capacity Range: Customized according to project requirements, with solutions available for medium- and large-capacity substations
Voltage Class: 110kV
Phase: Three Phase
Frequency: 50Hz / 60Hz
Cooling: ONAN / ONAF / OFAF and other customized cooling configurations
Tap Changer: Off-circuit tap changer or OLTC
Insulation Medium: Mineral insulating oil or optional natural ester insulating oil
Design Life: More than 30 years under specified operating conditions
Delivery: Standard delivery approximately 90 days; expedited solutions available according to project schedule

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• Product advantages
• Product parameters
• Ordering instructions

Product Advantages

Technical Standards & International Certification

HENGFENGYOU 110kV oil-immersed power transformers are engineered and manufactured according to internationally recognized transformer standards. The design, material selection, manufacturing process and testing procedures can be coordinated with the technical requirements of different countries, utilities and EPC projects.

International Standards: GB, IEC, GOST, EN, NF and ANSI/IEEE. Customized technical specifications are available according to the applicable grid code, utility standard or project specification.

Certifications: ISO, CE, IEC, SABS, COC, CSA and UL certifications are available according to product and project requirements.

The transformer design can also be adapted to local requirements for insulation coordination, ambient temperature, altitude, short-circuit conditions, noise level, efficiency and transportation.

Flexible Configuration for Different Grid Structures

One of the key advantages of a 110kV transformer is its flexibility in regional transmission and distribution systems. HENGFENGYOU can configure the transformer according to the number of voltage levels and the load characteristics of the substation.

Double-Winding Transformer:
Suitable for conventional 110kV-to-medium-voltage substations and industrial power supply systems where direct voltage transformation is required.

Three-Winding Transformer:
Designed for substations requiring simultaneous power supply to multiple voltage levels, such as 110kV/35kV/10kV systems. It can reduce the need for multiple independent transformers and simplify the overall substation arrangement.

Autotransformer:
Suitable for applications involving relatively close voltage levels and high-capacity power transfer. Its compact structure and lower material consumption can provide advantages in appropriate grid configurations.

Stable Operation Under Variable Loads

Modern regional grids increasingly integrate industrial loads, distributed generation and renewable energy sources. These operating conditions can result in changes in load level and voltage conditions.

HENGFENGYOU 110kV transformers can be optimized according to the expected load profile, short-circuit capacity and voltage regulation requirements of the project. For substations with frequent voltage fluctuations, an on-load tap changer (OLTC) can be configured to maintain the required secondary-side voltage within the specified operating range.

For industrial and renewable energy applications, transformer impedance, cooling capacity, insulation coordination and thermal performance can be customized to match the actual operating conditions.

Efficient and Low-Loss Transformer Design

The magnetic circuit uses high-quality electrical steel and optimized core construction to reduce no-load losses and operating noise. The winding structure is designed to provide balanced electric-field distribution, reliable mechanical strength and stable performance under short-circuit conditions.

Depending on the project specification, the transformer can be designed with optimized load losses and no-load losses to support the energy-efficiency targets of the substation throughout its operating life.

For projects with additional environmental requirements, FR3 natural ester insulating fluid and other low-carbon material options can be considered.

Adaptable to Diverse Installation Environments

110kV substations are installed in significantly different environmental conditions. HENGFENGYOU provides customized designs for:

• High-temperature and tropical regions
• Cold and low-temperature areas
• High-altitude substations
• Coastal and salt-fog environments
• Dusty industrial areas
• Mining and heavy industrial sites
• Renewable energy collection and transmission stations

The transformer enclosure, cooling arrangement, insulation level, corrosion protection and accessories can be adjusted according to the site conditions specified by the customer.

Why Choose HENGFENGYOU for Your 110kV Transformer Project?

For a 110kV substation, transformer selection is not determined by rated voltage alone. Capacity, voltage ratio, tap-changing method, impedance, cooling system, insulation level and installation environment all affect the long-term performance of the equipment.

HENGFENGYOU ELECTRIC provides an integrated engineering approach from technical specification review to manufacturing, testing, transportation and commissioning support.

Project-Oriented Engineering & Custom Design

Rather than supplying only standard configurations, our engineering team develops transformer solutions according to the actual requirements of each project.

Key design factors include:

• Rated capacity and load profile
• HV/MV voltage combination
• Vector group
• Short-circuit impedance
• Tap-changing range
• Insulation coordination
• Cooling method
• Ambient temperature and altitude
• Noise requirements
• Installation and transportation conditions

This approach allows the transformer to be better matched with the substation's primary equipment and operating conditions.

Reliable Manufacturing & Quality Control

The manufacturing process covers core cutting and assembly, winding, insulation treatment, tank fabrication, vacuum oil filling, accessory installation and comprehensive testing.

Before shipment, each transformer undergoes factory testing according to the applicable standards and project specifications. Depending on the contract requirements, testing can include:

• Winding resistance measurement
• Transformer ratio and phase displacement tests
• No-load loss and no-load current tests
• Short-circuit impedance and load loss tests
• Insulation resistance tests
• Dielectric tests
• Temperature rise tests
• Partial discharge tests where applicable
• Factory routine and type/special tests according to project requirements

The testing process is intended to identify potential manufacturing or assembly issues before the transformer reaches the project site.

Practical Delivery Solutions for Global Projects

110kV transformers are large and specialized pieces of equipment, making transportation planning an important part of project execution.

HENGFENGYOU coordinates manufacturing schedules, factory inspection, packing, transportation and shipping arrangements according to the delivery conditions of each project.

For urgent projects, an accelerated production schedule can be evaluated based on transformer capacity, configuration, component availability and testing requirements.

Technical Support Throughout the Project Lifecycle

Our support extends beyond transformer manufacturing.

HENGFENGYOU can provide technical assistance during:

Project Design → Technical Specification Confirmation → Manufacturing → FAT → Transportation → Site Installation → Commissioning → Operation & Maintenance

The service scope can include technical document preparation, installation guidance, commissioning support, operation instructions and after-sales technical assistance.

Product Parameters

The 110kV oil-immersed power transformer can be customized according to the electrical and environmental requirements of the project.

Typical technical parameters include:

• Rated Voltage: 110kV class
• Rated Capacity: Customized according to project load requirements
• Frequency: 50Hz / 60Hz
• Phase: Three Phase
• Winding Configuration: Double winding / three winding / autotransformer
• Voltage Regulation: Off-circuit tap changer or OLTC
• Cooling Method: ONAN / ONAF / OFAF, subject to capacity and project requirements
• Connection Group: Customized according to the power system
• Insulating Medium: Mineral insulating oil / natural ester insulating oil
• Impedance: Designed according to system short-circuit capacity and load characteristics
• Insulation Level: According to IEC, GB or project-specific requirements
• Installation: Outdoor
• Standard: IEC 60076 / GB 1094 and applicable project standards

The final rated capacity, voltage ratio, losses, impedance, tap range, cooling method and insulation level are determined according to the approved technical specification.

Ordering Instructions

To obtain an accurate technical proposal and quotation for a 110kV oil-immersed power transformer, customers are recommended to provide the following information:

• Rated capacity: MVA
• Voltage ratio: HV/MV/LV, such as 110/35/10kV
• Frequency: 50Hz or 60Hz
• Number of windings: Double winding / three winding / autotransformer
• Voltage regulation: Off-circuit tap changer or OLTC
• Tap range: Required voltage regulation range
• Connection group: If specified by the project
• Cooling method: Required or recommended according to capacity
• Short-circuit impedance: If specified
• Insulation level: According to the local grid requirement
• Operating environment: Altitude, ambient temperature, humidity, pollution level and installation location
• Special requirements: Noise level, natural ester oil, corrosion protection, online monitoring, fire protection and other accessories
• Applicable standards: IEC, GB, GOST, ANSI/IEEE or utility-specific standards
• Delivery destination: Port, city or project site

Minimum Order Quantity: 1 set

Standard Delivery: Approximately 90 days, subject to final technical specifications and production schedule.

For customized or urgent 110kV transformer projects, please contact HENGFENGYOU ELECTRIC with your technical specification. Our engineering team can provide a project-specific configuration and quotation.