<100kVA Range
LQLVF-30KVA/171A Power Noise Filter: Advanced EMI Control for Variable-Frequency Applications
Core Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LQLVF-30KVA/171A |
| Phase | Single Phase |
| Rated Voltage | 0.35kV Input/Output |
| Rated Current | 85.7A per Terminal (171A total) |
| Frequency Range | 50-300Hz |
| Rated Capacity | 30kVA |
| Duty Cycle | 15 min ON / 15 min OFF (8 cycles/day max) |
Performance Specifications
Attenuation:
40kHz-100kHz: >40dB
100kHz-1MHz: >60dB
Partial Discharge: <3pC at rated voltage
Insertion Loss: <0.4dB across 50-300Hz
Frequency Response: Flat attenuation (±2dB) across operating range
Wide-Frequency Operation
Designed for demanding variable-frequency environments:
Broad Compatibility: 50Hz to 300Hz operation
Stable Performance: Consistent attenuation across frequency spectrum
Harmonic Immunity: Rejects interference from VFDs and inverters
Low Phase Distortion: <5° phase shift at 300Hz
Cyclical Duty Operation
High-Intensity Cycles: 8 operational cycles per day maximum
Precision Timing: 15 minutes ON at 100% load
Mandatory Cooling: 15 minutes OFF between cycles
Thermal Protection: Auto-shutdown at 120°C winding temperature
Engineering Design Features
High-Frequency Reactors: Nanocrystalline cores for wideband performance
Low-PD Insulation: Epoxy-encapsulated windings
Thermal Management: Forced-air cooling capability
Surge Protection: 8kV/μs transient response
Industrial Applications
Variable frequency drive (VFD) output filtering
Aerospace power system testing
Rail traction motor control systems
High-speed motor test benches
Research lab power amplifiers
"Filters operating above 60Hz require specialized design to maintain consistent attenuation without core saturation - a critical capability for modern power electronics testing."
– IEEE Transactions on Power Electronics
Installation Guidelines
Mount with vibration isolation pads
Maintain 150mm clearance for airflow
Use 50mm² minimum conductor size
Implement shielded twisted-pair control wiring
Verify frequency range compatibility before energization
Cyclical Operation Validation
| Test Parameter | Requirement | Result |
|---|---|---|
| Cycle Endurance | 8 cycles/day for 30 days | No performance degradation |
| Peak Temperature | After 15-min operation | ≤ 95°C at 40°C ambient |
| Cooling Efficiency | 15-min cooldown | ΔT ≤ 20°C reduction |
Compliance & Testing
IEC 61000-4-17 (Ripple immunity)
EN 50155 (Railway applications)
MIL-STD-461 (Military EMC)
IEC 60270 (Partial discharge)
Maintenance Protocol
After 100 Cycles: Torque check on terminals (40N·m)
Quarterly: Insulation resistance test (>250MΩ at 2.5kV DC)
Biannual: Frequency response verification
Annual: Partial discharge measurement
