Reliable 200KVA Transformer for Renewable Energy & Commercial Use, 20kV/0.4kV, Efficient Energy Conversion
200KVA transformer (20kV/0.4kV) with 97.5%+ efficiency for renewable energy & commercial use. Features 120% overload capacity, Dyn11/Yyn0 vector groups, and meets IEC/ANSI standards. Low noise (≤57dB) and VPI insulation ensure reliable operation.
Commercial Use 200KVA Transformer
,Renewable Energy 200KVA Transformer
,Efficient 200KVA Transformer
The Reliable 200KVA Transformer (20kV / 0.4kV) is a three-phase, dry-type step-down transformer engineered for renewable energy systems and commercial power distribution. It converts medium voltage (20kV) to low voltage (400V / 230V), serving as the interface between solar/wind inverters and the grid, or as the main distribution transformer in commercial complexes, data centers, and EV charging stations. The unit features grain-oriented silicon steel core, Class H insulation, and natural air cooling (AN) with optional forced air (AF). It meets IEC 60076 and ANSI C57.12.91 standards, with an efficiency rating exceeding 97.5% at 75% load.
- High Efficiency for Green Energy – No-load loss ≤ 420W, load loss ≤ 3250W (at 200KVA), reducing carbon footprint and operational costs in solar or wind applications.
- Wide Voltage Adaptation – Primary taps: ±2×2.5% (20kV) to accommodate grid fluctuations; secondary stable 0.4kV output for common LV equipment.
- Enhanced Overload Tolerance – 120% continuous overload and 150% for 1 hour (short-term), ideal for intermittent renewable generation peaks or commercial HVAC starting.
- Flexible Vector Group Selection – Dyn11 (standard) for unbalanced load handling in commercial buildings and renewables; Yyn0 optional for balanced industrial loads.
- Low Maintenance & Sound – Vacuum pressure impregnated (VPI) coils resist moisture and dust; sound level ≤ 57 dB(A) for quiet operation in occupied spaces.
| Parameter | Value |
|---|---|
| Rated Power | 200 KVA |
| Primary Voltage | 20 kV (±2×2.5% taps) |
| Secondary Voltage | 0.4 kV (400V / 230V) |
| Frequency | 50/60 Hz (dual rated) |
| Phase | Three-phase |
| Vector Group | Dyn11 (standard) / Yyn0 (optional) |
| Insulation Class | Class H (180°C) |
| Temperature Rise Limits | 125°C (resistance method) |
| No-load Loss | ≤ 420 W |
| Load Loss (75°C) | ≤ 3250 W |
| Impedance Voltage | 4% to 5% (configurable) |
| Short-circuit Withstand | 3 seconds |
| Sound Level | ≤ 57 dB(A) @ 1m |
| Insulation Level (BIL) | Primary: 125 kV / Secondary: 5 kV |
| Enclosure Protection | IP20 (indoor), IP23 / IP34 (optional outdoor) |
| Cooling Method | AN (natural air), AF (forced fan, optional) |
| Standards | IEC 60076, ANSI C57.12.91, IEEE C57.12.01 |
| Weight (approx.) | 1250 kg (copper winding) |
| Dimensions (L×W×H) | 1380 mm × 820 mm × 1150 mm (IP20) |
- Core: High-permeability grain-oriented silicon steel (M4 grade), step-lap joints to minimize hysteresis loss.
- Coils: Copper windings (aluminum optional), VPI treated with Class H varnish for high thermal endurance and humidity resistance.
- Taps: Off-circuit tap changer (de-energized) for primary voltage adjustment (±5% in 2.5% steps).
- Terminals: Primary – porcelain bushings for MV cable (up to 25 kA short-circuit rating). Secondary – copper busbars with NEMA or DIN pattern.
- Temperature monitoring: PTC thermistors or PT100 sensors with 4-20mA output for BMS integration.
- Optional accessories: Electrostatic shield, forced air cooling kit (adds 30% temporary capacity), surge arresters, and stainless steel enclosure.
Condition: Harmonic distortion from non-linear loads (EV chargers, LED drivers) and occasional voltage sags from upstream grid.
Design measure: Impedance set to 4.5% to limit harmonic resonance; primary taps allow manual voltage adjustment.
Solution: Stable secondary voltage within ±2% even with 20% harmonic content. Optional electrostatic shield blocks common-mode noise from affecting sensitive equipment.
Condition: High inrush current from multiple motor starts (e.g., conveyor systems, compressors) and dusty indoor environments.
Design measure: Class H insulation (180°C) with 125°C temperature rise margin withstands repeated inrush up to 10× full load for 1 sec. VPI encapsulated coils resist dust and metal particles.
Solution: Extended service life without derating; no regular cleaning required for windings, reducing maintenance costs.
Condition: Strict sound limits (nighttime occupancy) and limited electrical room footprint.
Design measure: Core and coil assembly with vibration-damping mounts; sound level ≤57 dB(A) – comparable to a quiet office environment. Compact footprint (1.13 m²) fits through standard double doors.
Solution: Silent operation suitable for hospitals and hotels; lower installation complexity and no special foundation.
Condition: Bi-directional power flow and DC injection from inverter faults (abnormal grid events). Also, wide ambient temperature range (-25°C to 50°C) for outdoor locations.
Design measure: Dyn11 vector group provides zero-sequence current path, preventing voltage unbalance during single-phase inverter feed-in. Insulation system enhanced for repetitive voltage spikes (BIL margin +10%).
Solution: Reliable coupling between inverters and the grid, reducing core heating due to harmonics. Compatible with UL 1741 and IEEE 1547 grid interconnection standards.
Condition: Rapid load swings (EV chargers from 0% to 100% in seconds) and exposure to road salts / de-icing chemicals (coastal or cold regions).
Design measure: Overload capacity of 150% for 1 hour handles peak charging demand. Optional IP34 enclosure (stainless steel 304 with marine-grade coating) resists salt spray and cleaning chemicals.
Solution: No need to oversize transformer for peak events; reduced risk of overtemperature shutdown during summer or winter peaks.
Q1 (Urban Power Distribution): What is the typical voltage regulation of this 200KVA transformer at full load?
A: With 4.5% impedance and unity power factor, regulation is approximately 3.5% from no-load to full load. At 0.8 PF lagging (typical for mixed loads), regulation stays under 4.5%. The primary taps allow compensation for long-term grid drift.
Q2 (Industrial Production): Can this transformer be installed near a large motor drive with VFD harmonics? What precautions are needed?
A: Yes. We recommend adding an optional electrostatic shield between primary and secondary windings to reduce common-mode noise. Also, specifying a K-factor rating (K-4 or K-7) – please inform our engineers of the harmonic profile. The standard unit can handle up to 15% total harmonic distortion without derating.
Q3 (Commercial Buildings): What is the maximum ambient temperature for full load operation without forced cooling?
A: The standard unit is rated at 40°C ambient for continuous full load (AN cooling). For ambient up to 50°C, we apply an 8% derating (max 184KVA) or you may choose the optional AF kit (forced fan) to restore 200KVA capacity. We can also supply a “high ambient” version with lower temperature rise (115°C) upon request.
Q4 (Renewable Energy Systems): Does the Dyn11 vector group prevent voltage unbalance when only two phases of solar inverters are feeding power?
A: Correct. Dyn11 allows zero-sequence current to circulate within the delta primary, limiting neutral point shift. With up to 40% unbalance on the secondary side, voltage unbalance remains below 2.5%, meeting utility interconnection requirements.
Q5 (Transportation Infrastructure): We need a transformer for a DC fast charging site – the load jumps from 20kW to 160kW within 2 seconds. Will this cause thermal cycling damage?
A: The transformer’s 150% overload capacity (300KVA for 1 hour) easily covers the 160kW peak (only 80% of rating). The Class H insulation system with 125°C temperature rise provides ample margin for repetitive loading. Our VPI coils also resist thermal stress cracking. No special mitigation needed.
Send your project specifications – receive a free thermal aging calculation and datasheet within 24 hours.
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