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The dry-type step-up transformer is a specialized power transmission equipment designed to elevate low-voltage energy to higher voltage levels. Utilizing an oil-free, air-cooled insulation structure, it seamlessly merges the ultimate fire safety of dry-type equipment with high-efficiency power elevation. It is widely deployed in renewable energy grid integration (solar PV/wind power stations), long-distance power transmission, and industrial captive power plants. Operating flawlessly without maintenance, it ensures a highly stable, fireproof, and eco-friendly step-up power supply.
Core Parameters:
• Rated Capacity: Custom scales up to multi-MVA ranges (AF cooling boosts capacity).
• Voltage Configuration: Low Voltage input (e.g., 0.4kV/0.69kV) stepped up to High Voltage (10kV/35kV).
• Structure: High-Strength Resin Cast + Superior Overload Resilience.
Product Features
Engineered with specialized step-up winding configurations to instantly elevate inverter outputs (0.4kV~0.69kV) to grid-level transmission voltages (10kV/35kV) with minimal energy loss.
Fully oil-free solid resin insulation. It is inherently flame retardant and self-extinguishing, eliminating the fire and explosion risks typical of high-voltage oil step-up transformers.
Designed to withstand the harsh harmonic distortions and massive load fluctuations inherent in wind and solar power generation, ensuring ultra-stable grid integration.
Supports dual AN/AF cooling modes. In Forced Air (AF) mode, the step-up capacity can safely surge by 30% to 50% to capture peak solar/wind power generation windows.
The absence of insulating oil means no periodic oil testing, filtration, or replacement. Ideal for remote solar farms and wind stations where dispatching maintenance crews is costly.
Highly compact footprint designed specifically to fit into prefabricated containerized substations (box-type substations) deployed across industrial grids and renewable energy fields.
Key Step-Up Electrical Parameters
| Parameter | Typical Value | Description |
| Rated Capacity | 800kVA ~ 5000kVA | Massive capacity engineered for centralized renewable power collection and transmission. |
| Rated Step-Up Voltage | Input: 0.4kV / 0.69kV Output: 10kV / 35kV | Precise conversion from inverter/generator voltage to standard medium-high grid voltage. |
| Vector Group | Dyn11 / Yd11 | Standard configurations ensuring grid synchronization and harmonic suppression. |
| Short-Circuit Impedance | 6.0% ~ 8.0% | Higher impedance specifically calibrated to endure severe short-circuit impacts on the grid side. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Solid resin casting ensures premium heat resistance under continuous heavy transmission loads. |
| Cooling Method | AN / AF | Natural air handles base loads; forced air maximizes power capture during peak generation. |
[Image of dry-type step-up transformer]
Standard Step-Up Series Technical Reference (35kV Class)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 800 | 6.0 | 1150 | 8200 | 2600 | 1500×1000×1450 |
| 1000 | 6.0 | 1350 | 9800 | 3000 | 1550×1050×1500 |
| 1250 | 6.0 | 1580 | 11800 | 3500 | 1650×1100×1600 |
| 1600 | 6.0 | 1920 | 14500 | 4200 | 1750×1150×1700 |
| 2000 | 6.0 | 2350 | 17500 | 4900 | 1850×1250×1850 |
| 2500 | 6.0 | 2850 | 21500 | 5800 | 1950×1300×1950 |
| 3150 | 6.0 | 3450 | 26000 | 7000 | 2100×1400×2150 |
* The table above illustrates typical large-capacity dry-type step-up configurations used in 35kV grid integration. Dimensions and specific loss metrics are heavily customized based on the inverter match and containerized substation spatial limits.
FAQ
Dry-type transformers have become the standard for modern photovoltaic (PV) and wind power integration for three critical reasons:
1) Fire Safety in Prefab Substations: Renewable energy plants typically use compact, prefabricated container substations. Using oil-immersed transformers inside these tight metal boxes poses a severe fire hazard. Dry-type units are completely non-combustible and self-extinguishing, ensuring the utmost safety for the entire generation array.
2) Zero Maintenance in Remote Locations: Solar and wind farms are frequently located in remote deserts or mountainous terrains. The dry-type transformer's solid resin design requires zero oil testing, filtering, or replacements, saving massive logistical and maintenance costs.
3) Strong Overload for Peak Generation: Renewable power generation peaks dramatically (e.g., maximum sunlight at noon). Dry-type step-up transformers equipped with AF (forced air) cooling can safely surge their capacity by 30%~50% exactly when it's needed, capturing maximum energy without risking equipment degradation.
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