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The low-voltage dry-type transformer utilizes air or solid insulating materials as its primary cooling and insulation medium, operating entirely without insulating oil. Featuring a rated voltage typically at or below 1000V on the low-voltage side, its core advantages lie in exceptional fire safety, environmental friendliness, and highly simplified maintenance. It is optimally designed for indoor applications and densely populated areas, seamlessly adapting to commercial high-rises, industrial workshops, and residential basements.
Core Parameters:
• Rated Capacity: 10kVA ~ 2500kVA (Forced air boosts capacity by 30%~50%).
• Voltage Configuration: HV 10kV/6kV | LV 380V/400V (Three-Phase).
• Protection: IP20 / IP23 for safe indoor integration.
Product Features
Completely oil-free design using solid resin or air insulation. Inherently self-extinguishing and flame retardant, effectively eliminating fire and explosion risks in populated buildings.
Utilizes high-permeability cold-rolled silicon steel and pure copper windings. Delivers exceptionally low no-load and load losses, cutting down long-term operational power costs.
Built with Class F (155℃) or Class H (180℃) insulation, strictly determining the transformer's high heat resistance and guaranteeing a prolonged, stable service life under load.
Standardly relies on Natural Air (AN) cooling. Activating the optional Forced Air (AF) cooling can safely boost the operational capacity by 30% to 50% during peak demand periods.
The absence of insulating oil implies zero oil testing or replacement. Routine upkeep is simply reduced to visual inspections and occasional dusting, keeping O&M costs minimal.
Employs the Dyn11 vector group, delivering robust resistance to unbalanced loads. The 4%~6% short-circuit impedance effectively withstands short-circuit impacts.
Key Specifications (Low-Voltage Dry-Type)
| Parameter | Typical Value | Description |
| Rated Capacity (SN) | 10kVA ~ 2500kVA | Highly scalable range. AN is the baseline capacity; AF mode boosts it by 30%~50%. |
| Rated Voltage (U1N/U2N) | HV: 10kV / 6kV LV: 380V / 400V | Standard 3-phase configuration perfectly adapting to industrial and civil load demands. |
| Rated Current (I1N/I2N) | I_N = S_N / (√3 × U_N) | Directly dictates the precise selection of downstream switches, fuses, and cabling. |
| Short-Circuit Impedance (Zk%) | 4.0% ~ 6.0% | Higher values increase short-circuit endurance but slightly reduce voltage stiffness. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Determines maximum thermal tolerance, safeguarding the transformer's lifespan. |
| Vector Group | Dyn11 | Standard connection ensuring robust handling of severe unbalanced electrical loads. |
| Protection Level | IP20 / IP23 | IP20 for clean indoors; IP23 prevents angled water dripping in semi-open facilities. |
Detailed Description
The low-voltage dry-type transformer serves as the fundamental step-down node for modern indoor distribution networks. By fully abandoning the use of insulating oil, it relies entirely on solid resin casting or advanced air insulation, presenting a completely hazard-free, non-polluting profile. This makes it an irreplaceable asset for commercial high-rises, residential basements, hospital wings, and sophisticated industrial plants where fire safety is paramount.
Encompassing a massive capacity range from 10kVA up to 2500kVA, it converts 10kV or 6kV high voltage down to a highly stable 380V/400V three-phase output. The robust Class F or H insulation guarantees exceptional thermal limits. Furthermore, thanks to its modular design and optional forced-air (AF) cooling systems, users can seamlessly tackle short-term load surges without risking equipment damage, ensuring enduring power stability with virtually zero maintenance requirements.
Standard SCB Series Technical Reference
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 50 | 4.0 | 170 | 850 | 320 | 850×650×950 |
| 100 | 4.0 | 220 | 1400 | 550 | 950×700×1000 |
| 160 | 4.0 | 280 | 1900 | 750 | 1050×750×1050 |
| 250 | 4.0 | 400 | 2700 | 1050 | 1150×800×1150 |
| 400 | 4.0 | 570 | 3900 | 1450 | 1250×900×1250 |
| 630 | 4.5 | 810 | 5880 | 1950 | 1350×1000×1350 |
| 1000 | 4.5 | 1150 | 8600 | 2700 | 1450×1050×1450 |
| 1600 | 4.5 | 1650 | 12800 | 3800 | 1650×1150×1650 |
| 2000 | 4.5 | 2050 | 15600 | 4500 | 1750×1250×1800 |
| 2500 | 4.5 | 2450 | 19000 | 5300 | 1850×1300×1900 |
* The table displays standard dry-type technology platform parameters. Dimensions and weights are for reference and may vary based on specific enclosure customizations.
FAQ
Choosing the correct IP (Ingress Protection) rating is vital for safe indoor or semi-outdoor operations:
1) IP20 Rating: This is the standard for clean, dry indoor electrical rooms. It prevents solid objects larger than 12.5mm (like human fingers or small tools) from entering the live parts, ensuring personal safety while allowing maximum natural airflow for cooling.
2) IP23 Rating: In addition to IP20 solid protection, IP23 prevents water sprayed at an angle up to 60° from vertical from causing harm. This is ideal for environments where overhead pipes might drip or for semi-open industrial corridors.
Note: If you plan to install the unit outdoors or in highly dusty/humid factory floors, you must opt for a custom IP54 fully sealed enclosure.
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E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
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