Edison Transformers

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FAQ

  • Edison Transformers
  • FAQ

    • FAQ

    Find answers to frequently asked questions about our products. See the most common topics and more.
    1.How do I determine the kVA rating of a transformer?
    Add the total connected load in kilowatts (kW), account for the power factor (usually 0.8 for industrial loads), and divide by 0.8. This ensures the transformer can handle the load efficiently, even under peak conditions.
    A transformer that uses air instead of oil for cooling. It is safer, environmentally friendly, and well-suited for indoor installations or areas where oil-based equipment poses risks.
    Yes, provided they have a weatherproof enclosure like NEMA 3R or higher. These enclosures protect the transformer from rain, dust, and other environmental factors.
    They are fire-resistant, require minimal maintenance, eco-friendly, and suitable for areas where oil leakage is a concern, like hospitals and high-rise buildings.
    Higher temperatures reduce efficiency and lifespan by increasing winding insulation stress. Installing the transformer in a controlled environment or ensuring proper ventilation can mitigate this issue.
    Low-voltage dry-type transformer efficiency is regulated by DOE standards. Under DOE 2016, a 15 kVA three-phase transformer has a minimum efficiency of 97.89%, and a 1000 kVA three-phase transformer achieves 99.28%, measured at 35% of the nameplate-rated load. With DOE 2029 standards, these efficiencies improve to 98.31% for a 15 kVA transformer and 99.42% for a 1000 kVA transformer, reflecting advancements in energy-saving technologies.
    Impedance is the opposition to current flow within the transformer. It affects voltage regulation and short-circuit performance, with typical values ranging from 1% to 6% as per 10 CFR 431 Subpart K.
    Yes, but standard models may overheat under high harmonics. K-rated or harmonic mitigating transformers are specifically designed for such conditions.
    A transformer engineered to handle non-linear loads that generate harmonics, preventing overheating and ensuring reliable performance.
    DOE 2029 standards demand up to 10% lower energy losses than DOE 2016, requiring improved materials like better-grade cores and advanced manufacturing techniques.
    Yes, amorphous cores have lower hysteresis losses, making them more energy- efficient. However, they are bulkier than CRGO core transformers.
    Visual inspections should be done quarterly to check for overheating or physical damage, with detailed maintenance conducted annually.
    Noise is typically caused by magnetostriction in the core or loose components. Ensuring proper assembly and using noise-dampening materials can reduce it.
    These certifications indicate the transformer meets rigorous safety and quality standards for North America, ensuring reliable performance.
    With proper maintenance, dry-type transformers can last 25–40 years, depending on environmental conditions and load management.
    Yes, but only if they have the same voltage ratios, impedance, and phase displacement. Mismatched transformers can lead to circulating currents and damage.
    A transformer with a delta-connected primary and a wye-connected secondary, commonly used to step down voltage in distribution networks.
    Common tests include insulation resistance, no-load and full-load testing, winding resistance, and dielectric tests to ensure performance and reliability.
    Grounding provides a path for fault currents, stabilizes voltage levels, and protects against electrical shocks.
    Basic Insulation Level (BIL) indicates the transformer’s ability to withstand high- voltage impulses without insulation breakdown.
    Signs include overheating, reduced efficiency, increased audible noise, and visible deformations in windings or insulation.
    Dry-type transformers use insulation classes defined by their maximum temperature rating:
    1. Class F: Rated for 155°C
    2. Class H: Rated for 180°C, designed for heavy-duty and demanding applications.
    3. Class R: Rated for 220°C, ideal for specialized industrial applications requiring maximum thermal durability. Higher classes allow transformers to operate safely at elevated temperatures, providing better longevity and load-handling capabilities.

    VPI enhances transformer performance and longevity by:
    1. Improved Insulation: Provides uniform resin impregnation, improving dielectric
    strength.
    2. Moisture Resistance: Seals windings, protecting them from moisture and
    contaminants.
    3. Enhanced Thermal Dissipation: Ensures better heat transfer for cooler operation.
    4. Reduced Noise and Vibration: Improves structural integrity, minimizing mechanical
    vibrations.
    5. Environmental Friendliness: Uses solvent-free resins, making it an eco-friendly
    insulation method..

    Yes, but installation must comply with the National Electrical Code (NEC) and other relevant standards:
    1. Maintain a minimum clearance of 6 inches from walls or other surfaces. This allows proper airflow for cooling.
    2. Ensure sufficient ventilation to prevent overheating. Refer to NEC Article 450.9, which requires proper ventilation for heat dissipation.
    3. Use NEMA-rated enclosures if the space is exposed to dust, moisture, or hazardous materials.
    4. Avoid installing transformers near combustible materials, as per NEC Article 450.21(A).
    Class H (180°C) or Class R (220°C) are ideal for high-temperature environments due to their superior thermal endurance, ensuring long-term reliability and safety under demanding conditions.