What Are the Core Technical Specifications of an 80kVA Epoxy-Resin Dry-Type Transformer?
Jan 28, 2026
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Selecting the right transformer for demanding applications requires a deep understanding of its fundamental technical blueprint. For projects prioritizing safety, durability, and reliability in challenging environments, the 80kVA epoxy-resin dry-type transformer is a premier choice. Its specifications define its capabilities, limits, and suitability for your specific site conditions.
This guide details the core technical parameters you must evaluate, moving beyond the basic kVA rating to explore the engineering data that ensures optimal performance, compliance, and longevity in your commercial or industrial power system.
Who We Are: Your Specialist in Engineered Dry-Type Transformers
GNEE is a leading manufacturer with dedicated expertise in cast resin transformer technology. We engineer our 80kVA epoxy-resin dry-type transformers to meet precise and rigorous specifications, providing not just products but certified power solutions for critical infrastructure, manufacturing, and specialized facilities. Our commitment is to deliver transparent technical data and expert guidance, empowering you to make a specification-driven decision with confidence.
The foundational specifications define the transformer's electrical interface and capacity. For an 80kVA epoxy-resin dry-type transformer, these include:
- Rated Power: 80 kVA. This is the apparent power output the transformer can deliver continuously under standard conditions without exceeding its temperature rise limit.
- Voltage Ratings:
- Primary Voltage (HV): Common standard ratings include 11kV, 10kV, 6.6kV, or 3.3kV. This must match your incoming supply voltage.
- Secondary Voltage (LV): Typically 400V/230V (3-phase + neutral) or 480V/277V, supplying standard low-voltage equipment.
- Vector Group: Such as Dyn11. This defines the phase relationship and connection between windings, critical for parallel operation and grounding schemes.
- Frequency: 50 Hz or 60 Hz, corresponding to the regional grid frequency.
- Impedance Voltage (Uk%): Typically between 4% and 6% for this rating. A crucial spec that affects voltage regulation and short-circuit current levels.
Insulation System, Temperature, and Cooling Parameters
The epoxy-resin technology excels here, and its specs are vital for reliability:
- Insulation Class: Standard is Class F (155°C) or Class H (180°C). This specifies the maximum allowable temperature for the winding insulation.
- Temperature Rise: The permitted increase above ambient temperature, usually 80K or 100K for the winding. A lower temperature rise (like 80K) indicates a more conservative, longer-life design.
- Cooling Method: Designated as AN (Air Natural) for self-cooling. For higher demand, AF (Air Forced) with fans can be specified.
- Protection Degree (IP Code): The encapsulated windings themselves are typically IP00, but the overall enclosure provides protection. Standard enclosures are IP20 (indoor) or IP23/IP54 (outdoor/splash-proof).
Understanding these thermal and protection specs is key to selecting a transformer for harsh environments. Our harsh-duty cast resin transformers are built to exceed standard specifications.
Key Construction and Material Specifications
The quality of construction materials directly impacts performance and safety:
- Core Material: High-grade, low-loss, cold-rolled grain-oriented (CRGO) silicon steel. This minimizes no-load (core) losses.
- Winding Material: High-purity, electrolytic copper for low resistance and reduced load losses, superior to aluminum in efficiency and mechanical strength.
- Encapsulation Resin: High-quality, flame-retardant epoxy resin with excellent thermal conductivity and mechanical strength, cast under vacuum to prevent voids.
- Enclosure: Made from hot-dip galvanized steel or aluminum with corrosion-resistant paint, especially for outdoor models.
Losses, Efficiency, and Sound Level Specifications
These parameters determine operational cost and environmental impact:
- No-Load Loss (Po): The power loss when energized but not supplying load. A critical figure for 24/7 operation.
- Load Loss (Pk): The loss due to load current, dependent on the square of the current (I²R).
- Efficiency Level: Conforms to international efficiency classes such as IE3 (High Efficiency).
- Sound Power Level (LWA): Measured in decibels (dB). Epoxy-resin transformers are naturally quieter; a typical 80kVA unit may operate below 60 dB(A).
For projects focused on sustainability, our high-efficiency dry-type transformers provide detailed loss data for total cost of ownership calculations.
GNEE 80kVA Epoxy-Resin Dry-Type Transformer: Core Technical Parameters Table
| Specification Category | Parameter | Standard / Typical Value |
|---|---|---|
| Rated Data | Rated Power | 80 kVA |
| Primary Voltage (HV) | 11kV, 10kV, 6.6kV, 3.3kV | |
| Secondary Voltage (LV) | 400V / 230V (or as required) | |
| Frequency | 50 Hz / 60 Hz | |
| Performance | Vector Group | Dyn11 (or as required) |
| Impedance Voltage (Uk%) | 4% or 6% (Customizable) | |
| Efficiency Class | IE3 (High Efficiency) | |
| Insulation & Thermal | Insulation Class | Class F (155°C) or Class H (180°C) |
| Temperature Rise (Winding) | 80K (or 100K) | |
| Cooling Method | AN (Air Natural) | |
| Losses & Environment | No-Load Loss (Po) | [Value in Watts - e.g., < 220W] |
| Load Loss (Pk) | [Value in Watts at rated current] | |
| Sound Level | < 60 dB(A) (Typical) | |
| Construction | Winding Material | Copper |
| Insulation/Encapsulation | Vacuum-cast Epoxy Resin | |
| Core Material | High-grade CRGO Silicon Steel | |
| Standards & Compliance | Protection Degree (Enclosure) | IP20 (Indoor), IP23/IP54 (Outdoor) |
| Fire Safety | Self-extinguishing, UL94 V-0 resin | |
| Applicable Standards | IEC 60076-11, UL, CE |
Conclusion: Specify with Confidence Using Verified Technical Data
A thorough understanding of the core technical specifications of an 80kVA epoxy-resin dry-type transformer is essential for a successful and reliable installation. These parameters collectively guarantee safety, efficiency, and durability tailored to your application's demands.
Do not base your decision on estimates. Contact GNEE today to request the full, certified technical datasheet for our 80kVA epoxy-resin transformer and consult with our engineering team to ensure every specification aligns with your project requirements.