Polyester Resin Isolation Dry Type Transformer

What exactly is a Polyester Resin Isolation Dry Type Transformer? 

Unlike traditional oil-filled transformers that pose fire and leakage risks, or standard dry-type units with lower insulation grades, this transformer uses high-quality Polyester Resin as the primary insulation material for both primary and secondary windings. This design creates a solid, void-free insulation system that provides superior dielectric strength, moisture resistance, and thermal conductivity.

The Polyester Resin Isolation Dry Type Transformer serves two essential functions: voltage transformation (step-up or step-down) and electrical isolation. The isolation feature creates a galvanic barrier between input and output, protecting sensitive loads from harmonics, surges, and ground loops. It is particularly suitable for environments where safety, space, and environmental compliance are critical—such as hospitals, data centers, industrial automation lines, and solar farms.

By choosing our Polyester Resin Isolation Dry Type Transformer, you eliminate the need for oil containment pits, fire suppression systems, or dedicated transformer vaults. It is a true “plug-and-play” solution that reduces installation time and long-term operating costs.

Product Parameter (Specification)

Certifications & Compliance

All Polyester Resin Isolation Dry Type Transformer units comply with:

ISO 9001:2015 – Quality Management System

IEC 60076-11 – Dry-type transformers

ANSI/IEEE C57.12.01 – General requirements

GB1094.11 – Power transformers (dry-type)

CE – Low Voltage Directive (LVD)

100% routine tests performed: winding resistance, turns ratio, no-load loss, load loss, induced overvoltage, partial discharge (≤10pC), and Hi-Pot.

Why Choose Lugao Power? (Advantages Over Competitors)

Why customers choose us:

Faster delivery (50% shorter lead time).

True 100% copper windings – verified.

Seismic certification (IBC 2018 compliant) available.

Customizable taps, enclosures, and voltages.

Packaging & Delivery

Packaging:

Core & coil: Vacuum-sealed moisture barrier + plywood crate.

Enclosed unit: Bolted to skid, covered with waterproof PE film, corner protectors.

Accessories (sensors, hardware) packed separately.

Delivery:

EXW, FOB, CIF from Shanghai/Ningbo port.

Standard sizes shipped within 4 weeks.

Full documentation: test reports, manuals, drawings.

Frequently Asked Questions (FAQ)

Q1: What is the expected lifespan of this transformer?

A: With our Class H Polyester Resin insulation and VPI process, the expected lifespan is 30+ years. Lower operating temperatures (due to efficient core design) significantly extend insulation life.

Q2: How do I prevent condensation inside the enclosure for outdoor use?

A: Our standard IP23 enclosure includes drip shields. For high-humidity coastal areas, we offer an optional low-wattage space heater with hygrostat to prevent coil sweating.

Q3: Can I backfeed this transformer?

A: Standard units are not designed for reverse feed. However, Lugao Power can customize the flux density and tap configuration specifically for reverse feed applications (e.g., generator step-up).

Q4: Do you provide warranty on the Polyester Resin Isolation Dry Type Transformer?

A: Yes. We provide a standard 12-month warranty from date of commissioning (or 18 months from shipment, whichever is sooner), covering all manufacturing defects. Extended warranty up to 60 months is available with a service contract.

Q5: What is the partial discharge level?

A: Our VPI process ensures partial discharge ≤10pC at 1.5× rated voltage, far below IEC limits, ensuring long-term reliability.

Q6: Do you offer custom voltages and frequencies?

A: Yes. We customize primary/secondary voltages (up to 36kV), 50/60Hz, and tap ranges based on your specifications.