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The 500kVA cast-resin dry-type transformer is a core equipment for medium-capacity distribution systems. Utilizing enhanced resin-cast insulation and a dual-mode natural/forced air cooling system, it flawlessly merges zero-fire-risk environmental safety with robust mid-range load-bearing stability. It is the premier choice for pollution-sensitive and highly populated areas such as mid-sized industrial parks, commercial main stations, precision manufacturing plants, and public hubs (hospitals, sports centers). Operating consistently in environments from -25℃ to 40℃, it ensures uncompromised electrical transmission.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (Complies with GB 20052-2024).
• Structure: Resin Cast Insulation + AN/AF Dual Cooling (Highly robust, compact).
• Warranty: 3-Year Standard Warranty.
Product Features
Fully oil-free resin-cast operation with zero emissions. Inherently flame retardant and self-extinguishing, utterly eradicating explosion hazards in highly populated public areas.
Meets Tier 2 efficiency. Copper windings drastically reduce resistance losses. The solid resin structure naturally resists moisture and dust, yielding a design lifespan of 25+ years.
Equipped with comprehensive smart protection including temp controllers and overheat alarms. The fully enclosed structure guarantees stability in complex indoor or semi-outdoor setups.
Volume is reduced by 20%~30% compared to large-capacity models. Perfect for floor installation or pre-installed outdoor boxes, bypassing the need for dedicated oil pits.
No oil testing or replacement required. Regular dust wiping of cooling channels and visual checks on the resin state are all that's needed, keeping O&M costs exceptionally low.
Can be fitted with a smart monitoring system to remotely track winding temperatures, load currents, and insulation status, minimizing physical patrol needs.
Key Specifications (500kVA SCB13 Series)
| Parameter | Typical Value | Description |
| Rated Capacity | 500kVA | Reliable apparent power perfectly tailored for mid-sized factory floors and commercial branches. |
| Rated Voltage | HV: 10kV | LV: 0.4kV | Standard grid voltages, highly adaptable for varied regional distribution systems. |
| Vector Group | Dyn11 / Yyn0 | Mainstream connections ensuring seamless integration and balanced load supply. |
| Impedance | 4.0% ~ 6.0% | Effectively limits short-circuit currents, protecting downstream distribution equipment. |
| No-Load Loss | ≤ 1.16kW (SCB13) | Tier 2 compliant; ultra-low idle consumption significantly reduces electricity overhead. |
| Load Loss (120℃) | ≤ 4.80kW | Copper windings ensure minimal resistance, maximizing energy conversion under load. |
| Winding Temp. Rise | ≤ 100K (Class F) | Resin insulation and robust air convection prevent heat-induced insulation degradation. |
| Noise Level | ≤ 50~55dB(A) | Shock-absorbing design creates an ultra-quiet footprint, avoiding noise pollution. |
| Cooling Method | AN / AF (Dual Mode) | Natural air handles standard loads; Forced air (AF) safely boosts load capacity by an extra 30%. |
Detailed Description
The 500kVA cast-resin dry-type transformer (mainstream SCB13 series) is a three-phase, Tier 2 efficiency unit recognized as a premier choice for medium-capacity distribution. Its defining advantage is absolute environmental safety combined with a strong load-bearing structure. Utilizing a solid epoxy resin cast, it blocks out moisture and dust while delivering unmatched flame-retardant properties—eliminating the severe fire and leakage risks associated with oil-immersed alternatives.
Engineered with low-resistance copper windings and an advanced dual-mode air convection cooling system, it achieves highly stable, low-loss operation. Operating smoothly across -25℃ to 40℃, it exhibits exceptional overload capabilities, supported by optional forced-air cooling that surges capacity by 30%. Because of its compact design (volume reduced by 20%~30%) and ultra-quiet performance, it is widely deployed in highly sensitive zones such as commercial complexes, data centers, and precision industrial zones.
SCB10 Type Parameters & Scenarios
| Parameter | Typical Value | Description |
| Energy Efficiency | GB 20052-2024 Tier 2 (NX2) | Adapts to basic energy-saving compliance requirements. |
| No-Load Loss | Approx. 1.35kW | Slightly higher than SCB13, fulfilling fundamental medium-voltage needs. |
| Load Loss (120℃) | Approx. 4.80kW | Consistent with the SCB13 model of the same capacity. |
| Partial Discharge | ≤ 10pC | Reliable insulation performance, ensuring foundational operational safety. |
| Core Material | Standard High-Grade Silicon Steel | Balances magnetic permeability and cost for conventional operations. |
| Applicable Scenarios | Budget-limited, load ≤ 60% | Ideal for standard commercial blocks, small manufacturing hubs, and older grid upgrades. |
Standard SCB13 Series Technical Reference
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 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 |
* The table displays standard SCB13 dry-type technology platform parameters. Dimensions and weights are for reference and may vary based on specific enclosure customizations.
FAQ
Installing the 500kVA dry-type transformer requires focusing on layout adaptation, proper ventilation, and system matching. Core precautions include:
1) Installation Layout Adaptation: Maintain a safe distance of ≥1.2m from surrounding electrical equipment and cables. Reserve a maintenance channel of ≥1.0m to ensure adequate operational space.
2) Cooling Space Reservation: Ensure a clearance of ≥1.0m above the unit and ≥0.8m around the sides. Do not install in completely sealed spaces. Natural airflow must be unobstructed. If using AF (forced air) mode, the room must have adequate vents.
3) Power Match & Grounding: Ensure the input/output voltages strictly match the 10kV grid. The enclosure and core must be reliably grounded with a resistance of ≤4Ω to provide uncompromised leakage protection.
4) Handling & Flexible Mounting: Use dedicated lifting tools and avoid bumping the resin windings. For floor installation, the ground must be flat and solid, utilizing standard brackets. Tilting can impair insulation and cooling performance.
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E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
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