Copper Winding Pad Mounted Dry Type transformer

What Is This Equipment?

The Copper Winding Pad Mounted Dry Type Transformer is a three-phase, cast resin dry-type transformer specifically designed for pad-mounted outdoor installations. It steps down medium voltage (typically 10kV–35kV) to low voltage (400V/380V) for safe distribution to residential communities, commercial centers, industrial parks, and renewable energy projects.

Unlike traditional oil-immersed transformers, this product uses no insulating oil. Instead, it employs epoxy resin solid insulation combined with natural or forced air cooling. The windings are made entirely of high-conductivity copper, ensuring lower resistive losses, better overload capacity, and longer service life. The pad-mounted enclosure allows direct ground-level installation without the need for a separate substation building, significantly saving civil construction costs and space.

Product Description

Lugao's Copper Winding Pad Mounted Dry Type Transformer is engineered for reliability, efficiency, and safety in outdoor distribution networks. Rated from 50kVA to 2500kVA, with standard voltages of 10kV/0.4kV (customizable to 6kV, 20kV, or 35kV), this transformer meets GB 20052-2020 Level 2 energy efficiency standards, with some models approaching Level 1.

Key electrical performance includes no-load losses up to 37% lower than conventional dry-type transformers, load losses reduced by up to 30%, partial discharge ≤5pC, and noise levels ≤55dB at 1 meter. The copper windings ensure excellent thermal conductivity and mechanical strength, significantly improving short-circuit withstand capability.

The unit is housed in a weather-resistant, lockable pad-mounted enclosure rated IP23 or higher, protecting against rain, dust, and vandalism. An intelligent temperature control system with PT100 sensors, auto-start fans, overheat alarm, and RS485 communication is included as standard.

With a 30-year design life and minimal maintenance requirements, this Copper Winding Pad Mounted Dry Type Transformer is the ideal choice for utilities, EPC contractors, and facility managers seeking a safe, long-lasting, and energy-saving distribution solution.

Product Parameter (Specification)

Product Feature And Application

Key Features

All-Copper Windings – Lower resistive losses, higher overload capacity, and better short-circuit withstand compared to aluminum.

Fireproof & Explosion-Proof – Epoxy resin casting, self-extinguishing, no oil leakage risk.

Pad-Mounted Design – Ground-level installation, no substation building required, saves 40–60% civil work cost.

Ultra-Low Losses – Meets GB Level 2 energy efficiency, reduces annual electricity bills significantly.

Smart Monitoring – PT100 sensors, fan auto-start, overheat alarm/trip, RS485 to BAS.

Low Noise – ≤55dB, suitable for residential and commercial areas.

Maintenance-Free – No oil testing, no drying, no moving parts.

Q&A: Product Feature Explained

Q1: Why choose a Copper Winding Pad Mounted Dry Type Transformer over an oil-immersed type for outdoor use?

A: Oil-immersed transformers pose fire and leakage risks, especially in residential or environmentally sensitive areas. The Copper Winding Pad Mounted Dry Type Transformer uses no oil, so there’s zero risk of fire spread or ground contamination. Additionally, the copper windings provide better thermal conductivity and mechanical strength, ensuring reliable operation even under peak summer loads. Many municipalities now mandate dry-type transformers for new outdoor installations due to stricter fire codes.

Q2: Is copper winding really worth the extra cost compared to aluminum?

A: Absolutely. While the initial cost of a Copper Winding Pad Mounted Dry Type Transformer is about 15–20% higher than an aluminum-wound unit, the total lifecycle cost is significantly lower. Copper has 40% higher conductivity, meaning lower load losses and reduced electricity bills. Copper also has higher tensile strength, so the transformer better withstands short-circuit forces. Over a 30-year design life, the energy savings alone easily justify the investment.

Q3: Can this transformer handle high humidity and rainy seasons, especially in southern regions?

A: Yes. Our Copper Winding Pad Mounted Dry Type Transformer uses a vacuum casting process where epoxy resin completely encapsulates the copper windings, forming a sealed insulation layer. The core and clamps undergo anti-corrosion treatment. With an IP23 enclosure, the transformer operates normally in 100% relative humidity. No drying is required before restarting after prolonged shutdown.

Q4: What happens if the transformer overloads during summer peaks?

A: Under natural cooling (AN), it runs continuously at 100% load. With forced air cooling (AF), capacity increases by 40–50%. The copper windings can withstand 150% rated load for 2 hours. This overload capability ensures power continuity during critical events.

Q5: How long is the warranty, and what does it cover?

A: Standard warranty is 12 months from shipment, covering all manufacturing defects. A paid service contract can extend warranty to 36 or 60 months. Technical support is free for life.

Production Details

Core Material and Manufacturing Process

The core of every Copper Winding Pad Mounted Dry Type Transformer is constructed using high-permeability cold-rolled grain-oriented silicon steel, with step-lap joints to minimize no-load current and stray losses. The core is precision-sheared and automatically stacked to ensure uniform magnetic paths.

Winding Structure – All Copper

Both high-voltage and low-voltage windings use oxygen-free copper conductors. The low-voltage windings adopt a foil-winding configuration with uniform inter-layer insulation, significantly enhancing short-circuit withstand capability. Copper's superior thermal conductivity also helps dissipate heat more effectively, reducing hot-spot temperatures.

Insulation System – Epoxy Resin Vacuum Casting

The windings are cast under vacuum with high-grade epoxy resin, eliminating voids and ensuring partial discharge ≤5pC. This solid insulation system is flame-retardant, moisture-proof, and chemically stable. No insulating oil is used, making the transformer safe for indoor and outdoor pad-mounted installations.

Enclosure and Pad-Mounted Design

The transformer is housed in a heavy-duty, lockable steel enclosure with a weather-resistant powder coating. Standard protection is IP23 (rain and dust resistant), with IP34 or IP54 optional for harsh environments. The base is designed for direct mounting on a concrete pad, with cable entry from below. Lifting lugs and grounding terminals are standard.

Quality and Testing Assurance

Each Copper Winding Pad Mounted Dry Type Transformer undergoes comprehensive type tests and routine tests before delivery, including:

1. No-load loss and load loss tests

2. Short-circuit impedance test

3. Induced over-voltage withstand test

4. Partial discharge measurement (≤5pC)

5. Lightning impulse test

6. Temperature rise test

7. All key performance indicators exceed GB and IEC requirements.

Certifications

1. ISO 9001:2015 Quality Management System

2. CE certified

3. Type test reports from independent labs