100kV ~ 400kV Range
LQTT Series 250kV/125kVA High-Power Test Transformer
(Cylinder Type | Single Phase | Industrial-Grade)
Key Innovations
✅ Unprecedented Power: 125kVA Capacity (5× industry-standard units)
✅ Ultra-Low Partial Discharge:
<5pC @ 100% Uₙ (250kV)
<2pC @ 70% Uₙ (175kV)
✅ Precision Monitoring: 1000:1 Measuring Winding (±0.1% accuracy)
✅ Robust Insulation: 1500MΩ inter-winding isolation (IEC 60296 compliant)
Technical Specifications
| Parameter | Value | Standard |
|---|---|---|
| Electrical | ||
| Frequency | 50 Hz | IEC 60076 |
| LV Voltage/Current | 0.6 kV / 208.3 A | |
| HV Voltage/Current | 250 kV / 0.5 A | |
| No-Load Current | ≤10% | IEEE C57.12.00 |
| Waveform Distortion | ≤3% | IEC 60060-1 |
| Impedance Voltage | ≤8% | IEC 60076-1 |
| Insulation | ||
| HV-LV Ground Isolation | 1500 MΩ | IEC 61180 |
| Measuring Winding Ratio | 1000:1 | IEC 61869-2 |
| Thermal | ||
| Winding Temp Rise | ≤65 K (80% continuous) | IEC 60076-14 |
| Oil Surface Temp Rise | ≤55 K (80% continuous) | IEC 60076-14 |
| Mechanical | ||
| Height (w/ Al Electrode) | 2300 mm | ISO 9001 |
| Weight | 2200 kg | |
| Cooling | ONAN | ISO 2206 |
Engineering Breakthroughs
Dielectric Superiority
Triple-Layer Insulation System:
HV ↔ LV: 1500 MΩ
HV ↔ Measuring Winding: 1500 MΩ
LV ↔ Measuring Winding: 1500 MΩExceeds IEEE 1799 requirements for substation-grade equipment
Dynamic PD Performance
175kV operation for <2pC ultra-sensitive diagnostics
250kV operation for production-line testing
Voltage-optimized PD suppression:
High-Current Design
100% load (125kVA): 60 min operation
80% continuous load (100kVA): Unlimited runtime
208.3A LV input enables stable 250kV output under:
Advanced Construction
Aluminum top electrode: 40% weight reduction vs. steel
Cylindrical tank with optimized magnetic flux paths
Target Applications
Utility-Scale Testing: Circuit breakers, GIS, 400kV+ transformers
Cable Factory QC: Type tests per IEC 60840/62067
Research Labs: Dielectric studies at industrial power levels
Renewable Energy: HVDC converter transformer validation
Competitive Advantages
► Grid-Ready Power: 125kVA supports cascade configurations up to 750kV
► Measurement Precision: 1000:1 winding enables live calibration without shutdown
► Thermal Resilience: ONAN cooling maintains ≤55K oil rise at 100kVA continuous load
► Safety Compliance: Meets EN 50191 (test station safety) and NFPA 70E (arc-flash)
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