Isolation Transformer
LQHIT 350KVA/6kV High-Voltage Single-Phase Isolation Transformer
Critical Power Isolation for 6kV Systems
Engineered for high-voltage industrial applications, this transformer features dual electrostatic shields that reduce electromagnetic interference (EMI) by up to 95dB. With 110% insulation withstand capability and specialized shielding, it minimizes partial discharge interference in critical 6kV measurement systems while supporting continuous 60-minute full-load operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Capacity | 350 kVA |
| Phase Configuration | Single Phase |
| Input Voltage | 6 kV |
| Output Voltage | 6 kV |
| Rated Current | 58.3A |
| Insulation Level | 5min @ 110% Un (winding to ground) |
| Impedance Voltage | <6% |
| Noise Level | <60dB(A) at 1m distance |
| Cooling System | ONAN (Oil Natural Air Natural) |
| Frequency | 60Hz |
| 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 >99%.
Enhanced Insulation System
Withstands 110% rated voltage for 5 minutes (6.6kV), exceeding standard requirements by 40% for critical high-voltage applications.
Ultra-Low Impedance Design
Optimized <6% impedance delivers superior voltage regulation (±0.8%) with 98.9% efficiency at full load - outperforming standard high-voltage transformers by 25%.
Performance Comparison
| Metric | Standard 6kV Transformers | LQHIT 350KVA |
|---|---|---|
| Partial Discharge Reduction | 50-60% | >99% |
| Insulation Withstand | 100% Un | 110% Un |
| Voltage Stability | ±3% | ±0.8% |
| Operational Noise | 70-80dB | <60dB |
| Continuous Full-Load | 30 minutes | 60 minutes |
High-Voltage Applications
Power Generation: Isolate excitation systems in 6kV generator sets
Industrial Motor Control: Clean power for 6kV motor drives and VFDs
High-Voltage Test Labs: Reference power for partial discharge measurement systems
Mineral Processing: Power for 6kV grinding mills and crushers
Utility Substations: Condition power for distribution equipment
Safety & Reliability Features
Enhanced Dielectric Protection: 110% voltage withstand for 5 minutes
Thermal Management: ONAN cooling maintains ≤50°C temperature rise at full load
Overload Protection: Dual-stage thermal cutoffs trigger at 90°C
Pressure Management: Reinforced tank with pressure-relief diaphragm
Corrosion Resistance: Epoxy-coated core and tank for harsh environments
Inrush Control: Limits startup surge to 2.2x rated current
Technical Compliance
Manufactured to international standards:
IEC 60076 for power transformers
IEC 61558-2-4 for safety of 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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