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3-Phase Oil Immersed Distribution Transformers

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4000 kVA 35/6.3 kV Outdoor Oil-Immersed Transformer

The 4000 kVA 35/6.3 kV Outdoor Oil-Immersed Transformer is designed for high-capacity outdoor power distribution applications. This project-specific configuration features a sealed tank with external radiators, copper windings, ONAN cooling and high-voltage no-load tap changing.

The transformer is rated at 4000 kVA, with a 35 kV high-voltage winding and a 6.3 kV low-voltage winding. The specified vector group is Y/D-11, while the high-voltage side is equipped with no-load tap changing (NLTC) with a voltage regulation range of ±2 × 2.5%.

The transformer is supplied fully assembled and filled with insulating oil. Main accessories and technical documentation are configured according to the project specification.

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Key Specifications

Parameter	Specification
Rated Power	4000 kVA
High Voltage	35 kV
Low Voltage	6.3 kV
Frequency	50 Hz
Vector Group	Y/D-11
Voltage Regulation	NLTC, ±2 × 2.5%
Cooling Method	ONAN
Winding Material	Copper
Installation	Outdoor
Ambient Temperature	-45°C to +40°C
Installation Altitude	Up to 1000 m
Short-Circuit Impedance	7.5% (+10% tolerance)

Typical Applications

This type of outdoor oil-immersed transformer can be configured for high-capacity medium-voltage power distribution systems where the required voltage ratio, rated capacity, cooling arrangement and installation conditions are defined by the project.

For project-based applications, the transformer configuration can be adjusted according to the required electrical specifications, installation environment, accessories and technical documentation.

Testing & Quality Control

Routine tests are specified within the scope of IEC 60076, with test reports provided in English.

The factory inspection and testing documentation is included in the project documentation package according to the agreed requirements.

Design & Technical Features

01 Sealed Tank with External Radiators

The transformer uses a sealed tank with externally mounted radiators. The radiator mounting structure is reinforced with diagonal braces and metal channels to provide structural support during transportation and operation.

02 Copper Windings

Copper is specified as the winding material for both the transformer design and the project configuration.

03 ONAN Cooling

The transformer adopts ONAN (Oil Natural Air Natural) cooling. Heat is dissipated through natural circulation of insulating oil and natural air circulation under the specified operating conditions.

04 High-Voltage No-Load Tap Changing

The high-voltage winding is equipped with no-load tap changing (NLTC), with a voltage regulation range of ±2 × 2.5%.

Tap adjustment is intended to be performed when the transformer is de-energized.

05 Outdoor Installation

The transformer is specified for outdoor installation with an ambient temperature range of -45°C to +40°C. The specified installation altitude is up to 1000 m.

Packing & Delivery

The transformer is delivered fully assembled and filled with insulating oil.

The packaging includes protective film and a reinforced plywood crate suitable for truck transportation. The package is marked with lifting points, center of gravity, product identification, quantity and gross/net weight information.

Packaging and transportation arrangements can be coordinated according to the project and delivery requirements.

How to Request a Quote

For a project-specific oil-immersed transformer quotation, please provide the available technical information, such as:

· Rated capacity

· High-voltage rating

· Low-voltage rating

· Frequency

· Vector group, if specified

· Tap requirements

· Cooling method, if specified

· Installation conditions

· Quantity

· Destination country

· Required technical standards or documentation

If some technical information is not yet available, the available project requirements can be submitted for technical review before configuration and quotation.

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