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The outdoor cast-resin dry-type transformer represents an advanced engineering leap, breaking the boundary that dry-type units are only for indoor use. By pairing a high-strength epoxy resin or Nomex/VPI insulated core with a heavily sealed, weather-proof enclosure (IP54/IP65), it confidently operates in direct outdoor environments. It completely eliminates the fire, explosion, and oil-leak risks of traditional outdoor oil-immersed transformers. It is the ultimate solution for urban street networks, renewable energy solar/wind stations, coastal facilities, and heavy industrial parks demanding zero-maintenance outdoor power.
Core Parameters:
• Protection Level: IP54 (Standard Outdoor) / IP65 (Extreme Weather/Coastal).
• Structure: Solid Resin Cast + Anti-Corrosion Enclosure (Rain, Dust, UV Resistant).
• Voltage Configuration: 10kV / 20kV / 35kV to 0.4kV.
Product Features
Equipped with specialized IP54 or IP65 outer enclosures. Thoroughly blocks rain, snow, dense industrial dust, and coastal salt spray, enabling direct outdoor installation.
Unlike standard outdoor oil transformers, the solid resin core completely eliminates oil leakage and explosion risks, ensuring peak safety for urban streets and forests.
The vacuum-cast epoxy resin (or Nomex VPI) delivers a partial discharge of ≤10pC. Extremely resistant to lightning impulse voltages (up to 75kV for 10kV networks).
The outdoor enclosure features specialized ventilation labyrinths and internal anti-condensation heaters, preventing moisture build-up during severe temperature drops.
Meets Tier 1 or Tier 2 efficiency norms. Optimized copper/aluminum windings ensure outstanding energy conversion efficiency even under heavy outdoor load fluctuations.
By abandoning insulating oil, operators save thousands on periodic oil testing, filtration, and environmental cleanup, resulting in an exceptionally low total cost of ownership.
Key Specifications (Outdoor Dry-Type Series)
| Parameter | Typical Value | Description |
| Rated Capacity | 30kVA ~ 3150kVA | Broad spectrum covering local street networks up to large renewable solar arrays. |
| Rated Voltage | HV: 10kV / 20kV / 35kV LV: 0.4kV / 0.69kV | Adapts flawlessly to standard outdoor distribution and specialized industrial voltages. |
| Protection Level | IP54 / IP65 (Enclosure) | Heavy-duty steel or aluminum enclosures preventing dust, rain, and hose-directed water. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Solid casting ensures premium heat resistance and immunity against cracking over decades. |
| Lightning Impulse (BIL) | 75kV (for 10kV class) | Highly robust against severe outdoor lightning strikes and grid overvoltage surges. |
| Cooling Method | AN / AF (Dual Mode) | Specialized weather-proof fans can be added to boost capacity by up to 30%. |
[Image of outdoor dry-type transformer with IP54 enclosure]
Full Series Technical Reference (SCB10/13 Platform: 30kVA ~ 3150kVA)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Base Weight (kg, without enclosure) | Base Dimensions W×D×H (mm) |
| 30 | 4.0 | 130~180 | 600 | 250 | 800×600×900 |
| 50 | 4.0 | 170~240 | 850 | 320 | 850×650×950 |
| 100 | 4.0 | 220~380 | 1400 | 550 | 950×700×1000 |
| 160 | 4.0 | 280~540 | 1900 | 750 | 1050×750×1050 |
| 200 | 4.0 | 340~620 | 2300 | 880 | 1100×800×1100 |
| 250 | 4.0 | 400~720 | 2700 | 1050 | 1150×800×1150 |
| 315 | 4.0 | 480~880 | 3300 | 1250 | 1200×850×1200 |
| 400 | 4.0 | 570~980 | 3900 | 1450 | 1250×900×1250 |
| 500 | 4.0 | 680~1160 | 4800 | 1700 | 1300×950×1300 |
| 630 | 4.5 | 810~1340 | 5880 | 1950 | 1350×1000×1350 |
| 800 | 4.5 | 980~1520 | 7100 | 2300 | 1400×1000×1400 |
| 1000 | 4.5 | 1150~1770 | 8600 | 2700 | 1450×1050×1450 |
| 1250 | 4.5 | 1350~2090 | 10400 | 3200 | 1550×1100×1550 |
| 1600 | 4.5 | 1650~2450 | 12800 | 3800 | 1650×1150×1650 |
| 2000 | 4.5 | 2050~3000 | 15600 | 4500 | 1750×1250×1800 |
| 2500 | 4.5 | 2450~3600 | 19000 | 5300 | 1850×1300×1900 |
| 3150 | 4.5 | 3000~4300 | 23000 | 6500 | 2000×1400×2100 |
* The table provides the core structural parameters. Note: The addition of the heavy-duty IP54/IP65 outdoor protective enclosure will increase the overall dimensions (approx. +200mm~400mm per side) and total weight compared to the base numbers listed above. Losses range covers high-efficiency (SCB13) to standard (SCB10) tiers.
FAQ
Operating a dry-type transformer inside a high-protection (IP54/IP65) outdoor enclosure requires advanced thermal and moisture management:
1) Thermal Dissipation (Cooling): Unlike indoor IP20 mesh enclosures, IP54 enclosures restrict direct airflow. To solve this, the enclosures are designed with specialized heat-exchange labyrinth louvers or active forced-air exhaust fans on the roof that prevent rain/dust entry while vigorously pumping out the hot air generated by the resin coils.
2) Condensation Prevention: In outdoor environments, rapid temperature drops at night can cause moisture in the trapped air to condense into water droplets on the high-voltage coils, posing an arcing risk. To combat this, the outdoor enclosure is equipped with an automatic anti-condensation heater. Controlled by a humiture (humidity + temperature) sensor, the heater activates automatically when ambient humidity spikes or temperature drops, keeping the internal air dry and the insulation safe.
Whatsapp: +86-13961294414
E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
ADD: No. 1, Yulong Middle Road, Xuejia Town, Xinbei District, Changzhou City, China
Mobile: 0086-15380068868
