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The dry-type step-down transformer is a precision-engineered piece of indoor distribution equipment. Designed with high-strength insulation, acoustic optimization, and a highly precise step-down coil structure, it acts as the vital link translating medium grid voltage into usable low voltage. Achieving the highest Tier 1 (NX1) energy efficiency standard, it reduces losses by 35%~45%. It operates oil-free, making it the supreme choice for commercial complexes, high-rise utility rooms, large industrial plants, and advanced data centers requiring uncompromising safety and long-term energy savings.
Core Parameters:
• Energy Efficiency: Tier 1 Efficiency (GB 20052-2024 NX1), drastically lowering OPEX.
• Structure: Precise Step-Down Coils + High-Grade Silicon Steel Core (Partial Discharge ≤5pC).
• Enclosure: IP40+ Custom Cabinets available for enhanced indoor protection.
Manufacturer Core Advantages
Complies with GB 20052-2024 Tier 1 standards. Optimizing the core and winding reduces no-load and load losses by an impressive 35%~45% compared to traditional models, saving massive electrical costs.
Engineered with a highly accurate step-down coil structure, ensuring the seamless and ultra-stable conversion of 10kV/20kV primary grid power into reliable 0.4kV low-voltage output.
Advanced vacuum casting minimizes internal air gaps, achieving a partial discharge of ≤5pC. This ensures unparalleled insulation integrity and guarantees long-term safe indoor operations.
100% oil-free design using premium flame-retardant resin. It acts as a self-extinguishing barrier, making it the most trusted choice for data centers and high-rise basements.
Available as an open-type unit or fitted with high-protection IP40 steel casings equipped with sealed cable entry/exit ports, perfectly isolating it from dusty or complex indoor environments.
Optional smart monitoring modules offer remote, real-time tracking of critical data like winding temp and load currents, elevating the operational management of the entire substation.
Key Specifications (Tier 1 NX1 Step-Down Series)
| Parameter | Typical Value | Description |
| Energy Efficiency | Tier 1 (GB 20052-2024 NX1) | Top-tier energy savings for demanding, continuous indoor distribution networks. |
| Rated Voltage | HV: 10kV / 20kV LV: 0.4kV | Highly precise voltage step-down to power 3-phase machinery and lighting. |
| No-Load Loss | Approx. 0.2kW ~ 1.8kW | Extremely low idle energy waste through premium low-loss CRGO silicon steel. |
| Load Loss (120℃) | Approx. 1.5kW ~ 11.0kW | Superb energy conversion efficiency under heavy, continuous loads. |
| Partial Discharge | ≤ 5pC | Industry-leading internal insulation purity, drastically reducing breakdown risks. |
| Protection Structure | IP40 or above (Optional) | Can be supplied with dedicated steel enclosures to block severe indoor dust. |
Full Series Technical Parameters (SCB13 10kV Platform)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 30 | 4.0 | 130 | 600 | 250 | 800×600×900 |
| 50 | 4.0 | 170 | 850 | 320 | 850×650×950 |
| 63 | 4.0 | 180 | 1030 | 360 | 900×650×950 |
| 100 | 4.0 | 220 | 1400 | 550 | 950×700×1000 |
| 160 | 4.0 | 280 | 1900 | 750 | 1050×750×1050 |
| 200 | 4.0 | 340 | 2300 | 880 | 1100×800×1100 |
| 250 | 4.0 | 400 | 2700 | 1050 | 1150×800×1150 |
| 315 | 4.0 | 480 | 3300 | 1250 | 1200×850×1200 |
| 400 | 4.0 | 570 | 3900 | 1450 | 1250×900×1250 |
| 500 | 4.0 | 680 | 4800 | 1700 | 1300×950×1300 |
| 630 | 4.5 | 810 | 5880 | 1950 | 1350×1000×1350 |
| 800 | 4.5 | 980 | 7100 | 2300 | 1400×1000×1400 |
| 1000 | 4.5 | 1150 | 8600 | 2700 | 1450×1050×1450 |
| 1250 | 4.5 | 1350 | 10400 | 3200 | 1550×1100×1550 |
| 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 |
| 3150 | 4.5 | 3000 | 23000 | 6500 | 2000×1400×2100 |
* The comprehensive table showcases our base dry-type structural platform. As Tier 1 (NX1) models, the final step-down units feature heavily optimized cores, meaning actual loss values (No-Load/Load Watts) are strictly guaranteed to be substantially lower than these standard reference limits.
Detailed Description
Our Tier 1 efficiency dry-type step-down transformer is the pinnacle of indoor power conversion. Built strictly under IEC and national standards, it utilizes an advanced, high-grade silicon steel core paired with a precise step-down coil structure. Its most prominent feature is its NX1 energy rating, which cuts electrical losses by up to 45% over older units, ensuring a rapid return on investment for large-scale industrial operations, commercial skyscrapers, and high-demand municipal facilities.
Beyond efficiency, it prioritizes unparalleled safety. The completely oil-free resin insulation delivers an ultra-low partial discharge (≤5pC) and is inherently flame-retardant. Whether deployed as an open-type unit in a clean electrical room or outfitted with a rugged IP40 steel cabinet for a dusty factory floor, it executes the 10kV/20kV to 0.4kV step-down process with whisper-quiet, zero-hazard reliability.
FAQ
Installing a step-down transformer with an IP40 protective enclosure demands attention to ventilation routing and cable entry management:
1) Ventilation & Clearances: While the IP40 steel casing effectively blocks tools and heavy dust, it relies on precisely designed louvers and internal convection to cool the resin coils. You must position the cabinet so that there is at least 0.8m of clearance on the louvered sides, and the indoor room must have an active exhaust system to expel the hot air emitted from the top vents.
2) Cable Entry Sealing: The cabinet comes with designated, sealable access ports (usually at the top or bottom). After routing your 10/20kV incoming lines and 0.4kV outgoing busbars/cables, the entry points must be meticulously sealed to preserve the IP40 rating, preventing rodents or dense dust from entering the high-voltage zones.
3) Grounding the Enclosure: In addition to the standard core grounding, the IP40 steel casing itself must be bonded to the substation's main earth grid (resistance ≤4Ω) to ensure absolute touch safety for operating personnel.
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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
