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The indoor cast-resin dry-type transformer is a highly reliable distribution core specifically engineered for indoor substations, high-rise electrical rooms, and commercial data centers. Utilizing a high-strength vacuum-cast epoxy resin insulation, it operates completely free of oil, ensuring absolute fire safety and zero pollution. Designed with a compact footprint and optimized for low noise, it seamlessly integrates into indoor switchgear lineups. It delivers highly stable power transmission for localized load centers while complying with Tier 2 energy efficiency standards.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (SCB10 Series, GB 20052-2024 NX2).
• Structure: Indoor Compact Design + Vacuum Resin Cast (IP20/IP40).
• Cooling Mode: AN / AF Dual Mode (Forced air safely boosts capacity by up to 30%).
Product Features
Fully oil-free structure with vacuum-cast epoxy resin. It is completely flame-retardant and self-extinguishing, strictly adhering to building safety codes for high-rises and basements.
Engineered specifically for confined indoor substations. Its compact dimensions allow for seamless integration alongside standard low-voltage switchgears without wasting real estate.
Features a high-grade silicon steel core assembled with 45° step-lap joints. This drastically dampens magnetic vibration, keeping indoor noise levels extremely low for quiet commercial environments.
Adheres to the SCB10 Tier 2 efficiency standards (NX2). It strikes the perfect balance between initial capital investment and long-term energy savings for standard industrial loads.
Available as an open unit (IP00) or equipped with protective IP20/IP40 steel cabinets, preventing vermin or accidental human contact within shared electrical rooms.
The solid-state design means no oil testing, filtering, or replacements. Simply ensure the indoor room is ventilated and periodically wipe the cooling channels of dust.
Key Specifications (Indoor SCB10 Series)
| Parameter | Typical Value | Description |
| Energy Efficiency | Tier 2 (GB 20052-2024 NX2) | Highly cost-effective baseline for standard indoor distribution. |
| Rated Voltage | HV: 10kV / 20kV LV: 0.4kV | Steps down primary grid voltages directly to safe indoor operating levels. |
| Vector Group | Dyn11 | Mainstream connection ensuring robust handling of unbalanced indoor loads. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Solid epoxy resin provides high thermal tolerance during continuous operation. |
| Partial Discharge | ≤ 10pC | Reliable internal insulation purity, preventing long-term breakdown. |
| Cooling Method | AN / AF (Dual Mode) | Natural air handles base loads; Forced air (AF) boosts capacity by up to 30%. |
[Image of indoor cast-resin dry-type transformer]
Full Series Technical Reference (SCB10 Platform: 30kVA ~ 3150kVA)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 30 | 4.0 | 180 | 600 | 250 | 800×600×900 |
| 50 | 4.0 | 240 | 870 | 320 | 850×650×950 |
| 100 | 4.0 | 380 | 1500 | 550 | 950×700×1000 |
| 160 | 4.0 | 540 | 2000 | 750 | 1050×750×1050 |
| 200 | 4.0 | 620 | 2400 | 880 | 1100×800×1100 |
| 250 | 4.0 | 720 | 2800 | 1050 | 1150×800×1150 |
| 315 | 4.0 | 880 | 3400 | 1250 | 1200×850×1200 |
| 400 | 4.0 | 980 | 4100 | 1450 | 1250×900×1250 |
| 500 | 4.0 | 1160 | 4900 | 1700 | 1300×950×1300 |
| 630 | 4.5 | 1340 | 6200 | 1950 | 1350×1000×1350 |
| 800 | 4.5 | 1520 | 7500 | 2300 | 1400×1000×1400 |
| 1000 | 4.5 | 1770 | 8800 | 2700 | 1450×1050×1450 |
| 1250 | 4.5 | 2090 | 10800 | 3200 | 1550×1100×1550 |
| 1600 | 4.5 | 2450 | 13200 | 3800 | 1650×1150×1650 |
| 2000 | 4.5 | 3000 | 16000 | 4500 | 1750×1250×1800 |
| 2500 | 4.5 | 3600 | 19500 | 5300 | 1850×1300×1900 |
| 3150 | 4.5 | 4300 | 24000 | 6500 | 2000×1400×2100 |
* The table above displays the complete parameter range for the standard SCB10 indoor platform. Dimensions and weights serve as a precise reference for electrical room space planning. Protective enclosures (IP20/IP40) will add slight variations to the overall footprint.
FAQ
Because indoor dry-type transformers rely on ambient air to dissipate heat, proper ventilation is critical for maintaining capacity and lifespan:
1) Clearances: You must maintain a minimum clearance of 0.8m to 1.0m from the walls and surrounding switchgears to ensure smooth air intake and exhaust around the resin coils.
2) Room Ventilation: The electrical room cannot be fully sealed. It must have adequate louvers for natural cross-ventilation. For large capacity models (≥800kVA), the room must be equipped with active exhaust fans placed near the ceiling to expel the rising hot air, ensuring the ambient temperature does not exceed 40℃.
3) Enclosure Selection: If the indoor environment has heavy foot traffic or rodent risks, select an IP20 or IP40 enclosure. Note that enclosed units require slightly more rigorous room ventilation to compensate for the restricted airflow caused by the protective steel mesh.
Indoor dry type transformers are widely used in office buildings, hospitals, shopping malls, data centers and industrial workshops. Without flammable insulating oil, they reduce fire risks. They can be installed directly indoors, saving extra fireproof rooms. The product features low noise and stable operation, suitable for places with strict environmental and safety requirements.
Unlike oil immersed transformers, indoor dry type transformers adopt resin casting insulation. There is no risk of oil leakage, explosion or fire hazard. Simple daily maintenance is required, no oil replacement work. They have strong resistance to moisture and dust, and can run stably under relatively poor indoor ambient conditions for a long service life.
Yes, we support custom manufacturing of indoor dry type transformers. We can adjust rated capacity, voltage ratio, impedance and protection accessories according to client demands. Our technical team will check your site parameters and load conditions to offer suitable design. We also provide technical drawings and test reports before delivery for your project approval.
Our indoor dry type transformers come with detailed installation manuals. We can send engineers to guide on-site assembly, wiring and commissioning upon request. Before putting into use, we will complete insulation and routine tests. Our after-sales team offers remote technical support to solve operation faults and answer daily operation questions quickly.
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
