Oil-Immersed Distribution Transformer

33/35 kV Oil-Immersed Distribution Transformer

A higher-voltage distribution and step-up transformer for 33 kV and 35 kV collector and distribution systems.

Rated voltage: 33 kV or 35 kV class
Capacity range: 500–20,000 kVA
Standards basis: IEC 60076 series; local efficiency rules where applicable
Typical application: renewable step-up…

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Technical product selection

Product Range

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Select the voltage, capacity and construction that matches the project. Final ratings are confirmed during technical review.

Typical Use

Where this product is used

renewable step-up, industrial substations and regional distribution

Technical Data

Typical technical parameters

The published values define the normal selection range. Final ratings and interfaces are confirmed against the approved single-line diagram and destination requirements.

Design standardIEC 60076 series; local efficiency rules where applicable

ConfigurationInternational distribution networks

Applicable standards

IEC 60076 series; local efficiency rules where applicable

Rated voltage

33 kV or 35 kV class

Rated capacity

500–20,000 kVA

System frequency

50 Hz or 60 Hz, as specified

Construction

Hermetically sealed or conservator type

Vector group

Dyn11 or project-specific

Tapping

Off-circuit or on-load regulation according to the network requirement

Application

renewable step-up, industrial substations and regional distribution

Ambient and altitude

Confirmed from site conditions

Testing and inspection

Routine tests plus agreed type, special and third-party inspection requirements

Documentation

Drawings, data sheets, test reports, manuals and packing documents

These values are for product selection. Final guaranteed values are confirmed in the approved technical agreement.

Configuration

Details to confirm before production

Confirm these items so the quotation and product design match your project.

Distribution duty

Confirm kVA demand, diversity, overload profile, primary system and secondary utilization voltage.

Tank construction

Choose hermetically sealed corrugated tank or conservator construction according to rating, maintenance policy and local practice.

Efficiency requirement

State the applicable national efficiency regulation or the guaranteed no-load and load-loss evaluation basis.

Outdoor environment

Define altitude, temperature, humidity, pollution, coastal corrosion and mounting arrangement.

Normal supply

Typical standard equipment

Sealed tank or conservator system as selected
Off-circuit tap switch
HV and LV bushings or cable boxes
Pressure relief and oil filling/drain provisions
Nameplate, earthing terminals and lifting lugs

Project options

Common optional equipment

On-load voltage regulation
Plug-in cable connectors
Winding temperature controller
Natural ester fluid
Cable boxes and terminal enclosures
Skid base, rollers or anti-vibration supports

Testing and Documents

Tests and documents supplied with the product

The required tests and documents are confirmed before the order is placed.

Routine verification

Tests required for each completed unit under the selected product standard.

Design and type evidence

Applicable type-test evidence or agreed design verification is reviewed during technical approval.

Special testing

Sound, temperature-rise, impulse, partial-discharge or other special tests are included only when specified.

Document package

Approved drawings, data sheets, test reports, manuals, packing list and agreed quality records.

Packing and Delivery

Protected for container or project cargo delivery

Tank finish, bushings, accessories and oil seals are protected according to the unit size, mounting arrangement and destination climate.

Sealed transformer body

Oil openings, valves and vulnerable fittings are sealed and protected. Corrugated fins, radiators and coating surfaces receive transport guards where needed.

Skid or crate selection

Smaller units can be secured to export skids or crates. Larger ratings are blocked and braced for container, flat-rack or project cargo transport.

Loose accessories

Cable boxes, rollers, gauges and separately packed accessories are labelled against the transformer serial number and packing list.

Storage on arrival

The delivery documents state lifting points, storage precautions and inspection steps for seals, oil leakage and transport damage.

A higher-voltage distribution and step-up transformer for 33 kV and 35 kV collector and distribution systems.

Oil-filled transformer project? Define the insulating liquid, sampling points, factory baseline and commissioning test package. See our DGA, moisture, BDV and sampling guide.

Product overview

33/35 kV Oil-Immersed Distribution Transformer is configured for renewable step-up, industrial substations and regional distribution. Apex coordinates technical review, qualified production, documentation and export delivery according to the approved project requirements.

Applications

renewable step-up, industrial substations and regional distribution. Final design considers the system study, load profile, fault level, installation environment, efficiency targets and local grid requirements.

Quotation Information

What to include with your inquiry

Send the information you already have. Unknown items can be confirmed during technical review.

Rated power (kVA)
Primary and secondary voltages
Single-phase or three-phase
Frequency and applicable standard
Efficiency or loss requirements
Sealed tank or conservator design
Required accessories
Quantity
Destination country and delivery location

FAQ

Questions buyers usually ask

Sealed tank or conservator type: which should be used?

Sealed corrugated tanks reduce routine oil handling for common distribution duties. Conservator arrangements remain appropriate where the rating, utility practice or accessory package requires an expansion system.

Which standard should be stated in the RFQ?

Use the project or utility standard stated in the specification. Where it is not defined, send the destination, system voltage and application so the appropriate IEC or ANSI/IEEE basis can be proposed.

Are guaranteed values the same as the website values?

No. Website values are selection guidance. Guaranteed performance is stated in the approved technical data sheet and commercial offer.

What information helps Apex respond faster?

A single-line diagram, load data, voltage ratio, capacity, quantity, installation conditions, destination and required delivery date provide the best starting point.

Applications

Choose equipment for the site and operating conditions.

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Technical Articles

Product selection and application guides.

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TECHNICAL ARTICLE

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33/35 kV Oil-Immersed Distribution Transformer

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