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STD Transformers in Renewable Energy Projects

Last updated on July 25, 2025

Manufacturing and export of oil-filled transformers for solar farms worldwide.

MLDUARTE represents the Turkish company STD Transformator, a manufacturer and service provider in the field of oil-immersed power and distribution transformers, founded in 2009 in Adana, Turkey.
STD manufactures various types of transformers, with different power ratings and voltage levels, in accordance with international standards IEC 60076, ANSI, BSI, IEEE, NEMA, TS EN 60076, IS:2026, and in compliance with ISO 9001, ISO 14001, and OHSAS 18001 certifications.
STD exports its production to more than 65 countries around the world.
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MANUFACTURING PROCESS
STD transformers are manufactured with the aim of delivering a high-quality and reliable product to the end user. The company uses a Quality-Oriented Manufacturing System (QMS) platform, which defines the standards of design, equipment, and processes used in its facilities. The use of this common technology allows STD to ensure consistent, high-quality products for its customers.
A transformer is a static inductive device that can step up or step down electrical voltage, allowing for efficient energy transfer. At STD, winding types and methods are selected to ensure reduced losses, based on magnetic field analysis, thus guaranteeing high levels of efficiency.
Furthermore, an optimised insulation structure is selected based on electric field analysis between turns, sections, windings, and phases, ensuring electrical stability.
Through fluid analysis technology, STD has developed an optimised cooling system, while three-dimensional structural analyses have enabled the design of a structure capable of withstanding internal mechanical stresses caused by short circuits, seismic conditions, and transport impacts.
STD’s factory is equipped with state-of-the-art core processing machines, modern winding machines, high-capacity vacuum drying equipment, and advanced cleaning facilities, always with a strong focus on occupational health and safety.
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TRANSFORMERS FOR PHOTOVOLTAIC POWER PLANTS
STD prioritises energy generation without consuming the planet’s natural resources. Solar energy is a clean, renewable, safe, and reliable source. Electricity generation through photovoltaic systems represents an efficient use of solar energy.
The use of low-loss products contributes to the protection of the environment and nature, while supporting solar power plants and renewable energy projects.
For solar parks, especially those with a capacity equal to or greater than 4 MVA, rectifier transformers (with double secondary winding) may be required. Transformers for solar power plants are designed with electrostatic shielding between the primary and secondary windings. Additionally, at the client’s request, STD manufactures transformers with enhanced resistance to harmonic fluctuations, particularly in environments with high levels of Total Harmonic Distortion (THD).
The various types of solar transformers include: Step-up transformers; Step-down transformers; Distribution transformers; Transformers for substation integration; Pad-mounted transformers; Grounding transformers; among others.
STD manufactures all these types of transformers, in various power ratings and voltage levels, in full compliance with international standards, and certified under ISO 9001, ISO 14001, and OHSAS 18001.
Based on its international experience, STD provides transformers suitable for large-scale photovoltaic power plants, with multiple low-voltage branches, high temperature limits, compact structures, high secondary integration, and ease of installation and operation.
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DISTRIBUTED PHOTOVOLTAIC GENERATION SYSTEMS (DPV)
In Distributed Photovoltaic Generation Systems (DPV), electricity is generated by converting solar radiation into direct current (DC) using semiconductors that exhibit the photovoltaic effect (PV).
Photovoltaic generation relies on solar panels composed of modules containing photovoltaic materials, typically silicon. The modules can produce voltages up to 1100 V (DC). This voltage is then converted into three-phase alternating current (AC) by a three-phase inverter. The inverter is connected to the DPV system’s transformer, which facilitates the distribution of electricity in alternating current.
From residential rooftops to industrial, commercial, and large-scale power plants, STD’s solar distribution transformers are adapted to solar inverters of various sizes and respective functions.
Examples of STD transformers in operation at solar farms:
200 units in Portugal (1000 and 800 kVA); 37 units in Spain (up to 5200 kVA and 3800 kVA); 100 units in Greece (up to 5000 kVA); 7 units in Ireland (2580 and 3250 kVA); 2 units in the United Kingdom (2700 and 4000 kVA); and 13 units in the Dominican Republic (4300 kVA).

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