Isolation Transformer
LQHIT 55KVA Double Shield Isolation Transformer: 380V Input to Dual 380V/220V Outputs
Premium Noise Suppression for Critical Power Systems
Engineered for industrial environments with severe electromagnetic interference, this transformer features dual electrostatic shields that deliver >10dB noise attenuation across the 15kHz-1MHz spectrum. The specialized copper-mesh barriers between HV/LV windings and coil assemblies effectively minimize partial discharge interference in sensitive measurement systems, ensuring signal integrity for precision instruments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Capacity | 55 kVA |
| Input Voltage | 380V AC (50Hz) |
| Output Voltages | 380V AC + 220V AC (Independent Circuits) |
| Input Current | 145A |
| Output Currents | 131.5A (380V) / 22.7A (220V) |
| Noise Damping | >10dB (15kHz-1MHz range) |
| Cooling System | ONAN (Oil Natural Air Natural) |
| Weight | 650kg |
| Dimensions (W×D×H) | 800mm × 600mm × 100mm |
| Footprint Area | 0.48m² |
Dual Shield Engineering Advantages
1. Primary Electrostatic Shield (HV-LV)
Copper-foil barrier eliminates capacitive coupling, reducing common-mode noise by 95% compared to single-shield designs. Essential for high-frequency measurement accuracy.
2. Secondary Shield (LV-Coil)
Prevents core-induced electromagnetic interference, maintaining signal integrity for instruments operating below 0.2mV resolution thresholds.
Optimized ONAN Cooling
Mineral oil thermal management enables 24/7 continuous operation at full load with maximum 55°C temperature rise, exceeding IEC 60076-11 requirements.
Performance Highlights
| Metric | Industry Standard | LQHIT 55KVA |
|---|---|---|
| Noise Suppression | 25-35dB | >45dB |
| Partial Discharge Reduction | 40-50% | >80% |
| Voltage Stability | ±5% | ±2.8% |
| Continuous Operation | 85% load capacity | 100% load capacity |
Industrial Applications
High-Voltage Test Facilities: Isolate PD measurement circuits from grid harmonics
Industrial Automation: Clean power for robotic assembly lines and CNC systems
Renewable Energy Plants: Stabilize output in solar/wind converter stations
Medical Diagnostic Centers: EMI-free supply for MRI and CT scanners
Research Laboratories: Precision power for sensitive measurement equipment
Installation & Safety Features
Low-Profile Design: 100mm height enables installation in space-constrained areas
Heavy-Duty Construction: 650kg robust build with reinforced tank walls
Enhanced Safety: Pressure-relief diaphragm and over-temperature cutoffs (IEC 61558-2-4 compliant)
Environmental Protection: IP55-rated terminals for harsh industrial environments
Vibration Resistance: Shock-absorbing mounts rated for 7G operational vibration
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