Isolation Transformer
LQHIT 400KVA/415V-3kV High-Voltage Step-Up Transformer
Precision Voltage Transformation for Critical Systems
Engineered for high-voltage applications, this step-up transformer converts 415V input to 3kV output with exceptional accuracy. Dual electrostatic shields reduce electromagnetic interference by up to 95dB, minimizing partial discharge interference in sensitive measurement systems while supporting 60-minute continuous full-load operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Capacity | 400 kVA |
| Phase Configuration | Single Phase |
| Input Voltage | 415V AC |
| Output Voltage | 3kV (3000V AC) |
| Input Current | 963.8A |
| Output Current | 133.3A |
| Frequency | 50Hz |
| Short-Circuit Impedance | ≤6% |
| Cooling System | ONAN (Oil Natural Air Natural) |
| Continuous Operation | 60 minutes at 100% rated load |
| Dielectric Medium | 25# Transformer Oil (IEC 60296) |
Advanced Engineering Features
Dual Electrostatic Shielding
Copper-mesh barriers between HV-LV and LV-coil assemblies provide 360° EMI protection, attenuating common-mode noise >90dB in the 10kHz-2MHz spectrum - reducing partial discharge interference by >98%.
Precision Step-Up Conversion
Specialized winding design maintains voltage ratio accuracy within ±0.5% during 415V to 3kV transformation - critical for high-voltage test systems and industrial processes.
High-Capacity Thermal Design
Optimized ONAN cooling maintains ≤52°C temperature rise during continuous 60-minute full-load operation - ideal for peak demand applications in power generation and testing.
Performance Comparison
| Metric | Standard Step-Up Transformers | LQHIT 400KVA |
|---|---|---|
| Partial Discharge Reduction | 50-60% | >98% |
| Voltage Stability | ±3% | ±0.5% |
| Impedance Voltage | 8-10% | ≤6% |
| Continuous Full-Load | 30 minutes | 60 minutes |
| Conversion Efficiency | 95-96% | 98.7% |
Industrial Applications
High-Voltage Test Labs: Power source for 3kV dielectric strength testing
Power Generation: Step-up conversion for excitation systems
Industrial Research: Precision power for partial discharge measurement systems
Mineral Processing: Drive power for 3kV grinding mills
Utility Substations: Step-up transformation for distribution equipment
Safety & Reliability Features
Enhanced Insulation: 110% voltage withstand for 5 minutes (IEC 60076)
Thermal Management: ONAN cooling maintains safe operating temperatures
Overload Protection: Dual-stage thermal cutoffs trigger at 90°C
Pressure Relief: Reinforced tank with safety diaphragm
Inrush Control: Limits startup surge to 2.0x rated current
Corrosion Resistance: Epoxy-coated core and tank
Technical Compliance
Manufactured to international standards:
IEC 60076 for power transformers
IEC 61558-2-4 for isolating transformers
IEEE C57.12.01 for general requirements
ISO 9001 quality management system
ANSI C89.2 for high-voltage transformers
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