Isolation Transformer
LQHIT 500kVA/10kV High-Voltage Isolation Transformer with Dual Electrostatic Shielding
Critical Power Isolation for 10kV Systems
Engineered for high-voltage industrial applications, this transformer features dual electrostatic shields that reduce electromagnetic interference (EMI) by up to 100dB. With 1.1Un/1min insulation withstand capability and specialized shielding between windings, it minimizes partial discharge interference in critical 10kV systems while maintaining exceptional voltage stability (±0.5%).
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Capacity | 500 kVA |
| Input Voltage | 10 kV |
| Output Voltage | 10 kV |
| Rated Current | 50A (Input & Output) |
| Frequency | 50Hz |
| Insulation Level | 1.1Un/1min (11kV for 1 minute) |
| 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 >95dB in the 10kHz-2MHz spectrum - reducing partial discharge interference by >99.5%.
Enhanced Insulation System
Withstands 11kV (110% rated voltage) for 1 minute, exceeding standard industrial requirements by 45% for critical high-voltage applications.
Ultra-Low Impedance Design
Optimized ≤6% impedance delivers superior voltage regulation (±0.5%) with 99.1% efficiency at full load - outperforming standard 10kV transformers by 28%.
Performance Comparison
| Metric | Standard 10kV Transformers | LQHIT 500kVA |
|---|---|---|
| Partial Discharge Reduction | 55-65% | >99.5% |
| Insulation Withstand | 100% Un | 110% Un |
| Voltage Stability | ±2% | ±0.5% |
| Operational Noise | 70-80dB | ≤60dB |
| Efficiency at Full Load | 96-97% | 99.1% |
High-Voltage Applications
Power Generation Facilities: Isolate excitation systems in 10kV generator sets
Industrial Substations: Clean power for 10kV switchgear and protection systems
High-Voltage Test Labs: Reference power for partial discharge measurement
Mineral Processing: Drive power for 10kV grinding mills and crushers
Utility Transmission: Condition power for distribution transformers
Safety & Reliability Features
Enhanced Dielectric Protection: 11kV withstand for 1 minute
Thermal Management: ONAN cooling maintains ≤48°C temperature rise
Overload Protection: Dual-stage thermal cutoffs (IEC 60076 compliant)
Pressure Management: Reinforced tank with pressure-relief diaphragm
Inrush Control: Limits startup surge to 1.8x rated current
Corrosion Resistance: Epoxy-coated core and tank for harsh environments
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
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