Isolation Transformer
LQHIT 600kVA/6kV High-Voltage Isolation Transformer with Dual Electrostatic Shielding
Ultimate Power Isolation for 6kV Systems
Engineered for critical high-voltage applications, this transformer features dual electrostatic shields that reduce electromagnetic interference (EMI) by up to 105dB. With 110% Un/5min insulation withstand capability and specialized shielding between windings, it eliminates partial discharge interference in sensitive 6kV systems while maintaining exceptional voltage stability (±0.4%).
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Capacity | 600 kVA |
| Input Voltage | 6 kV |
| Output Voltage | 6 kV |
| Rated Current | 100A (Input & Output) |
| Frequency | 50Hz |
| Insulation Level | 110% Un for 5 minutes (6.6kV withstand) |
| Impedance Voltage | <6% |
| Noise Level | <60dB(A) at 1m distance |
| Cooling System | ONAN (Oil Natural Air Natural) |
| 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 >100dB in the 10kHz-2MHz spectrum - reducing partial discharge interference by >99.7%.
Enhanced Insulation System
Withstands 6.6kV (110% rated voltage) for 5 minutes, exceeding standard industrial requirements by 50% for critical high-voltage applications.
Ultra-Low Impedance Design
Optimized <6% impedance delivers superior voltage regulation (±0.4%) with 99.3% efficiency at full load - outperforming standard 6kV transformers by 30%.
Performance Comparison
| Metric | Standard 6kV Transformers | LQHIT 600kVA |
|---|---|---|
| Partial Discharge Reduction | 55-65% | >99.7% |
| Insulation Withstand | 100% Un | 110% Un for 5 min |
| Voltage Stability | ±2% | ±0.4% |
| Operational Noise | 70-80dB | <60dB |
| Efficiency at Full Load | 96-97% | 99.3% |
High-Voltage Applications
Power Generation: Isolate excitation systems in 6kV generator sets
Industrial Substations: Clean power for 6kV switchgear and protection systems
High-Voltage Test Facilities: Reference power for partial discharge measurement
Steel Manufacturing: Drive power for 6kV arc furnaces
Cement Plants: Reliable operation for high-torque kiln drives
Safety & Reliability Features
Enhanced Dielectric Protection: 6.6kV withstand for 5 minutes
Thermal Management: ONAN cooling maintains ≤45°C temperature rise
Overload Protection: Triple-stage thermal cutoffs (IEC 60076 compliant)
Pressure Management: Reinforced tank with double diaphragm relief
Inrush Control: Limits startup surge to 1.5x rated current
Corrosion Resistance: Epoxy-coated core and stainless steel fittings
Technical Compliance
Manufactured to international standards:
IEC 60076 for power transformers
IEC 61558-2-4 for isolating transformers
IEEE C57.12.90 for test procedures
ISO 9001 quality management system
ANSI C57.12.00 for general requirements
EN 50588 for noise emission standards
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