Transformer Supply for EPC Power Projects

Transformers We Supply for EPC Projects

We manufacture transformers based on project drawings and technical specifications rather than fixed standard models. The following equipment is commonly used in EPC power projects:

 1. Oil-Immersed Distribution Transformers (11kV / 22kV / 33kV Class)

Typical capacities: 50kVA – 5000kVA

Used in:

* Utility distribution networks

* Rural electrification projects

* Industrial parks

* Residential power supply systems

Technical options:

* ONAN cooling

* Copper or aluminum winding

* Dyn11 / Yyn0 vector group

* Off-circuit or on-load tap changer (OLTC for higher ratings)

* Hermetically sealed or conservator type tank

These are the most widely deployed transformers in Africa and Southeast Asia grid expansion projects.

---

## 2. Medium Voltage Power Transformers (Up to 132kV / 170kV Class)

Typical capacities: 5MVA – 100MVA+

Used in:

* Substation transmission systems

* Grid interconnection projects

* Industrial power hubs

* Utility step-down stations

Technical configurations:

* ONAN / ONAF / OFAF cooling systems

* OLTC (On-load tap changer)

* IEC / IEEE / BS compliance

* Neutral grounding systems

* GIS or AIS substation integration

Common in Middle East utility upgrades and African transmission expansion projects.

3. Pad Mounted Transformers (Compact Substation Type)

Typical ratings: 200kVA – 2500kVA

Used in:

* Urban distribution networks

* Commercial complexes

* Hotels and hospitals

* Underground or space-limited installations

Features:

* Fully enclosed steel tank

* Loop feed or radial feed design

* Dead-front or live-front structure (as required)

* Anti-corrosion coating for coastal regions

Widely used in Southeast Asia commercial infrastructure and residential developments.

4. Pole Mounted Distribution Transformers

Typical ratings: 25kVA – 500kVA

Used in:

* Rural electrification

* Overhead distribution lines

* Remote villages and off-grid areas

Features:

* Single-phase or three-phase

* Aluminum or copper winding

* Outdoor pole mounting structure

* High resistance to humidity and rainfall

Very common in African rural grid extension programs.

5. Dry-Type Cast Resin Transformers (Indoor Use)

Typical ratings: 100kVA – 5000kVA

Used in:

* High-rise buildings

* Data centers

* Hospitals

* Airports and metro systems

Technical options:

* VPI or cast resin insulation

* IP23 / IP44 enclosure

* Low noise design (< 65 dB)

* Class F / H insulation system

Preferred in Middle East indoor installations due to fire safety requirements.

6. Solar Power Plant Step-Up Transformers

Typical ratings: 1MVA – 100MVA

Used in:

* Utility-scale PV plants

* Solar farms (33kV / 66kV / 132kV systems)

Technical configuration:

* Step-up from inverter voltage to grid voltage

* Dyn11 or Ynyn connection

* High ambient temperature design (up to 50°C+)

* Anti-harmonic and inverter load adaptation design

* Outdoor oil-immersed structure

Widely deployed in Middle East solar EPC projects.

7. Wind Farm Transformers

Used in:

* Onshore wind power projects

* Collector substations

Features:

* High mechanical strength design

* Continuous load fluctuation handling

* Low loss core design

* Anti-vibration structure

8. Compact Substations (Package Substation / Unit Substation)

Configuration includes:

* Medium voltage switchgear (RMU / AIS / GIS)

* Distribution transformer (oil or dry type)

* Low voltage distribution panel

Typical ratings: 500kVA – 2500kVA

Used in:

* Mining sites

* Industrial plants

* Remote EPC installations

This is a common “plug-and-play” solution for fast-track EPC projects.

Engineering Support Based on Project Conditions

Transformer selection is usually influenced by environmental and grid conditions, not only electrical ratings.

For example:

In *Middle East desert projects**, we often design higher cooling margins and anti-dust protection.

In *Southeast Asia coastal regions**, corrosion-resistant tank coating and humidity control are critical.

In *African remote grids**, mechanical strength and transport durability are often more important than compact size.

These factors are reviewed during the technical stage before production starts.

Manufacturing Approach

Each transformer is manufactured according to approved drawings from EPC contractors or consultants. Production includes:

* Core cutting and stacking (low-loss silicon steel)

* HV/LV winding manufacturing

* Vacuum drying and oil filling process

* Tank fabrication and surface treatment

* Electrical assembly and final testing

Materials and structure are adjusted based on:

* Project specification

* Grid standard (IEC / IEEE / BS / AS)

* Environmental conditions

Factory Testing Before Shipment

Each transformer undergoes routine electrical tests before delivery:

* Ratio test

* Winding resistance test

* Vector group verification

* Insulation resistance test

* No-load and load loss measurement

* Applied voltage test

* Oil leakage inspection

For utility projects, third-party inspection (SGS / BV / TUV) can be arranged.

Export Experience for EPC Projects

Transformers are often shipped to:

* Inland substations in Africa

* Coastal power plants in Southeast Asia

* Desert solar projects in the Middle East

Packaging is adjusted according to:

* Long-distance sea freight

* High humidity storage conditions

* Rough inland transportation routes

Typical EPC Applications

* 11kV / 33kV distribution networks

* Substation expansion projects

* Solar PV power plants

* Wind energy integration systems

* Mining power supply systems

* Oil & gas facilities

* Industrial manufacturing plants

* Infrastructure development projects

Engineering Before Manufacturing

Most project issues do not come from manufacturing—they come from incorrect transformer selection at the beginning.

That is why every order starts with a technical review of:

* System diagram

* Load profile

* Grid requirements

* Installation environment

The goal is simple: ensure the transformer fits the project before it enters production.