LQLVF 250kVA/2*416.6A Power Noise Filter: High-Current EMI Suppression with ONAN Cooling

Premium Broadband Noise Attenuation

Engineered for critical EMI suppression in industrial 0.6kV systems:

• 40KHz-100KHz range: >40dB attenuation

• 100KHz-2MHz range: >60dB attenuation (extended high-frequency coverage)

• Ultra-low background partial discharge: <2pC

• Dual-circuit design for balanced load distribution

Technical Specifications

Advanced ONAN Cooling Technology

Optimized thermal management for high-current applications:

• Mineral oil insulation with natural convection cooling

• Temperature rise limit: 65°C at full load

• Designed for ambient temperatures up to 45°C

• Expansion tank with nitrogen cushion

• Optimized radiator fins for efficient heat dissipation

High-Current Dual-Circuit Design

Robust engineering for demanding industrial applications:

• 833.2A total current capacity (2×416.6A)

• Low-impedance copper busbar design (≤0.08mΩ)

• Copper windings with 200% short-circuit withstand

• Dynamic load response time <5ms

• Parallel operation capability for higher current needs

Ultra-Low Partial Discharge Design

Premium EMI suppression for sensitive equipment:

• Background PD level <2pC at rated voltage

• Triple-shielded reactor construction

• Corona-resistant encapsulation technology

• PD-monitoring test points integrated

• Validated per IEC 60270 measurement standards

Pre-Stage Cabinet Integration

Optimized for installation in upstream power distribution:

• Compact form factor for pre-stage cabinet retrofitting

• Front-access terminals for maintenance access

• Vibration-resistant mounting brackets

• Thermal alignment with cabinet airflow patterns

• Standardized cable entry points (50mm knockouts)

Industrial Applications

Ideal for 0.6kV systems in:

• Industrial power distribution pre-stages

• Large motor control centers

• Foundry and smelting operations

• High-power test facilities

• Process manufacturing power systems

• Heavy industrial equipment power lines

Installation & Maintenance Protocol

Ensure optimal performance in pre-stage cabinets:

1. Verify cabinet clearance ≥400mm for natural convection

2. Use compression lugs rated for 500A connections

3. Check oil dielectric strength ≥40kV before commissioning

4. Torque power terminals to 70 N·m ±5%

5. Perform semi-annual insulation resistance tests

6. Monitor oil temperature quarterly during peak loads

7. Conduct partial discharge scans annually

Safety & Protection Systems

Engineered for reliable high-current operation:

• Pressure relief device with alarm contacts

• Buchholz relay for gas detection

• Dual RTD temperature sensors (oil and winding)

• Surge protection (15kV/20μs withstand)

• Automatic discharge circuit for capacitors

• IP54-rated enclosure for industrial environments

Compliance & Standards

Meets international requirements including:

• IEC 60076 power reactor standards

• IEEE C57.12.00 liquid-immersed equipment

• EN 50588-1 medium-power transformers

• IEC 61000-3-12 harmonic emissions

• ANSI/IEEE C57.91 thermal loading guide

• UL 506 standard for power transformers

For pre-stage cabinet integration guides or custom high-current solutions, contact our engineering team. Performance validated per IEEE 1137-2018 test standards.