In today's demanding industrial installations, resin transformers have become a key element of energy systems. Their growing popularity is due not only to high operational safety but also to their versatility in the most challenging industrial environments. At Onninen, we understand that the proper selection of a resin transformer for an industrial installation requires an in-depth analysis of many technical and environmental factors.
As a leader in the distribution of installation solutions, we offer a wide selection of dry resin transformers of the highest quality. Our experience in the energy sector allows us to advise clients on selecting optimal solutions for every type of industrial installation.
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Fundamental differences between resin and oil transformers
Resin transformers stand out primarily due to the use of epoxy resin as an insulating material, eliminating the need for transformer oil. In Onninen's range, you will find a full range of transformers that are characterized by the absence of an oil tank, which automatically increases resistance to external factors.
Key advantages of resin technology
- Fire safety - flame-retardant and self-extinguishing materials
- Environmental resistance - operation in extreme conditions from -50°C to +55°C
- Reliability - no risk of leaks and oil contamination
- Ease of installation - ready to operate immediately after installation
- Quiet operation - significantly lower noise levels than oil transformers
We recommend from our offer distribution transformers from trusted manufacturers that meet the highest quality standards in all industrial conditions.
Technical parameters determining the choice of resin transformer
Our team of experts recommends considering the following technical parameters when selecting a transformer for a specific industrial installation:
| Parameter | Standard range | Industrial application |
|---|---|---|
| Rated power | 160-3150 kVA | Adapted to installation load |
| Primary voltage | 1.1-36 kV | According to the power supply network |
| Secondary voltage | 0.4-0.69 kV | According to the requirements of receivers |
| Insulation class | F/H | Adaptation to thermal conditions |
| Degree of protection | IP00-IP54 | Dependent on the installation environment |
Selection of rated power
The primary criterion is the analysis of the actual load of the installation, taking into account anticipated expansions. Onninen offers transformers with standard powers as well as special designs tailored to individual customer needs.
Environmental conditions and their impact on transformer selection
Resin transformers exhibit exceptional resistance to environmental conditions, making them an ideal solution for the industry. Our experience shows that a properly selected transformer operates reliably even in the most challenging conditions.
Environmental and climatic classes
- Class E1/E2 - resistance to salinity and high humidity
- Class C2/C3 - operation in extreme temperatures
- Class F1 - increased fire resistance
- Special designs - for seismic and vibrational areas
Our specialists will help you choose the appropriate environmental class based on the specific operating conditions in your industrial installation.
Industrial applications of resin transformers
Resin transformers from Onninen are effective in a wide range of industrial applications:
Heavy and mining industry
In mines and metallurgical plants, resin transformers provide reliable power supply under high dynamic loads. Their resistance to shocks and vibrations makes them an ideal choice for applications with cranes and large machinery.
Chemical and pharmaceutical industry
Operational safety and the absence of toxic gas emissions during operation make resin transformers the first choice in environments with stringent sanitary requirements.
Data centers and IT infrastructure
Low noise levels and high reliability make resin transformers an optimal solution for critical IT systems requiring continuous power supply.
Resin transformer selection process - practical tips
Based on years of experience from the Onninen team, we have developed a systematic approach to selecting a resin transformer:
Step 1: Load and network analysis
Accurate measurement of actual loads, taking into account simultaneity factors and the perspective of installation development. Analysis of power quality and voltage regulation requirements.
Step 2: Assessment of installation conditions
Determining available space, ventilation conditions, IP protection degree requirements, and 
accessibility for maintenance.
Step 3: Selection of additional equipment
Selection of temperature monitoring systems, protective enclosures, forced ventilation systems, and protections according to industrial standards.
Installation and commissioning of the resin transformer
One of the greatest advantages of resin transformers is the simplicity of installation and commissioning. Unlike oil transformers, the devices from our offer are ready to operate immediately after connection.
Key installation stages
- Foundation preparation - proper placement and leveling
- Electrical connection - according to connection diagrams
- Insulation testing - resistance measurements and voltage tests
- Trial commissioning - testing all functions and protections
Our technical team provides full support during installation and training for operating personnel.
Frequently asked questions
1. What are the main advantages of resin transformers compared to oil transformers?
Resin transformers offer increased fire safety due to flame-retardant and self-extinguishing materials. Additionally, they are characterized by the absence of oil leak risks, quieter operation, easier installation, and the ability to operate in extreme temperature conditions from -50°C to +55°C.
2. What power ranges are available for resin transformers?
The standard power range for resin transformers is from 160 to 3150 kVA. Onninen also offers special designs with higher powers tailored to the individual requirements of industrial installations.
3. Do resin transformers require special maintenance?
Resin transformers have significantly lower maintenance requirements than oil transformers. The absence of oil eliminates the need for regular inspections of oil insulation condition, leak checks, and filter replacements, which significantly reduces operating costs.
4. What IP protection classes are available for resin transformers?
Resin transformers are available in protection degrees from IP00 to IP54. The basic design without a casing is IP00, while models in metal enclosures can achieve IP54, providing full protection against dust and water.
5. Are resin transformers suitable for operation in high humidity environments?
Environmental class E2 resin transformers are designed to operate at 100% relative humidity. Epoxy resin ensures complete hermetic sealing of the windings, preventing moisture penetration and ensuring reliable operation in the most challenging conditions.
6. How long does it take to install a resin transformer?
A resin transformer is ready to operate immediately after connection, without oil filling or leak tests. A typical installation takes 1-2 working days, depending on the complexity of the connections and required additional equipment.
7. What additional equipment can be ordered with a resin transformer?
A wide range of additional equipment is available: enclosures in various IP degrees, PTC and PT100 temperature sensors, ventilation systems. Special designs with anti-vibration constructions, adaptations for seismic areas, and automatic fan control are also possible.
Investing in the future of your installation
Choosing the right resin transformer is a strategic decision that affects the safety and efficiency of the entire industrial installation. At Onninen, we offer not only high-quality devices from trusted manufacturers but also comprehensive technical advice supporting the selection process.
Our branches across Poland ensure quick availability of resin transformers and professional technical support at every stage of project implementation. As a leader in the distribution of power engineering solutions, we guarantee the highest quality products at attractive prices and timely delivery.
Contact our specialists to receive an individual consultation and selection of the optimal resin transformer for your industrial installation. Our experience and wide range of distribution transformers will help find a solution perfectly tailored to the specifics of your project.