Isolation Transformer
LQHIT HIT 120 120KVA/3kV High-Voltage Isolation Transformer
Precision Power Isolation for 3kV Systems
Designed for high-voltage industrial applications, this transformer features dual electrostatic shields that reduce electromagnetic interference (EMI) by up to 75dB. With 10kV/min insulation strength and specialized shielding between windings, it minimizes partial discharge interference in critical measurement systems operating at 3kV.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HIT 120 |
| Rated Capacity | 120 kVA |
| Phase Configuration | Single Phase |
| Input Voltage | 3 kV (3000V) |
| Output Voltage | 3 kV (3000V) |
| Rated Current | 40A |
| Impedance Voltage | 6% |
| Insulation Level | 10kV/min |
| Operating Duty | Continuous (Same as Reactor) |
| 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 >70dB in the 10kHz-2MHz spectrum critical for high-voltage measurements.
Enhanced Insulation System
10kV/min dielectric strength exceeds standard industrial requirements by 60%, ensuring safe operation in high-potential environments and transient surge conditions.
Optimized 6% Impedance Design
Precision-engineered impedance provides superior voltage regulation (±1.8%) while limiting fault currents during short-circuit events.
Performance Comparison
| Metric | Standard 3kV Transformers | LQHIT HIT 120 |
|---|---|---|
| Partial Discharge Reduction | 40-50% | >95% |
| Insulation Strength | 5-7kV/min | 10kV/min |
| Voltage Stability | ±5% | ±1.8% |
| Noise Suppression | 30-40dB | >75dB |
| Continuous Operation | 80% load capacity | 100% load capacity |
High-Voltage Applications
Power Generation Facilities: Isolate excitation systems in 3kV generator sets
Industrial Motor Control: Clean power for 3kV motor drives and VFDs
High-Voltage Test Labs: Reference power for partial discharge measurement systems
Railway Electrification: Condition power for traction substations
Mining Operations: Reliable power for high-voltage haulage systems
Safety & Reliability Features
Enhanced Dielectric Protection: 10kV/min insulation withstand voltage
Thermal Management: ONAN cooling maintains ≤55°C temperature rise at full load
Overload Protection: Thermal cutoffs trigger at 90°C (IEC 60076 compliant)
Pressure Management: Reinforced tank with pressure-relief diaphragm
Corrosion Resistance: Epoxy-coated core and tank for humid environments
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
RoHS compliance for environmental safety
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