LQLVF 250kVA/2*657.9A Power Noise Filter: Ultra High-Current EMI Suppression with ONAN Cooling

Extreme Current Capability

Engineered for the most demanding industrial power applications:

• 1315.8A total current capacity (2×657.9A)

• Low-impedance design (≤0.05mΩ)

• Copper busbars with 200% short-circuit withstand

• Dynamic response time <5ms for load variations

• Parallel operation capability for higher current needs

Technical Specifications

Specialized Intermittent Duty Operation

Optimized for high-impact industrial processes:

• 15-minute full-power operation cycles

• Maximum 48 cycles per day (24 hours operation)

• Rapid thermal recovery during OFF cycles

• Cycle counter with maintenance alerts

• Thermal memory protection for sequential operations

Advanced ONAN Cooling Technology

High-performance thermal management for extreme currents:

• Enhanced mineral oil formulation for rapid heat transfer

• Temperature stabilization in <7 minutes after startup

• Oversized radiators with optimized fin geometry

• Nitrogen-blanketed expansion tank

• Dual-path convection channels

Ultra-Low Partial Discharge Design

Premium EMI suppression for sensitive equipment:

• Background PD level <2pC at rated voltage

• Quadruple-shielded reactor construction

• Corona-resistant epoxy encapsulation

• Integrated PD monitoring ports

• Validated per IEC 60270 measurement standards

Pre-Stage Cabinet Integration

Engineered for upstream power distribution:

• Reinforced mounting system for heavy-duty installation

• Front-access terminals with safety disconnects

• Thermal alignment with cabinet ventilation

• Vibration-dampened core mounting

• HV cable entry points with 60mm knockouts

Industrial Applications

Ideal for extreme-current 0.38kV systems:

• Industrial resistance welding systems

• Large induction heating installations

• Foundry arc furnace power conditioning

• High-current test laboratories

• Electrolytic process power systems

• Heavy industrial machinery power lines

Installation & Maintenance Protocol

Critical guidelines for ultra high-current systems:

1. Verify cabinet structural integrity (min 5mm steel)

2. Use silver-plated copper connectors (≥99% conductivity)

3. Maintain minimum 600mm clearance for airflow

4. Torque power terminals to 120 N·m ±3%

5. Monitor oil quality quarterly (BDV ≥40kV)

6. Perform infrared thermography during operation

7. Calibrate cycle counter annually

Safety & Protection Systems

Engineered for extreme operational environments:

• Explosion-resistant pressure relief system

• Triple-redundant temperature monitoring

• Arc-quenching containment chambers

• Surge protection (25kV/20μs withstand)

• Ground fault interlock system

• IP55-rated enclosure with corrosion protection

Compliance & Standards

Meets international requirements including:

• IEC 61000-3-12 harmonic emissions

• IEEE 519-2022 harmonic control

• EN 50588-1 medium-power transformers

• IEC 60076-11 dry-type transformers

• ANSI/IEEE C57.91 thermal loading guide

• NFPA 70 (NEC) Article 450

For ultra high-current applications or custom duty cycle configurations, contact our engineering team. Performance validated per IEEE 1137-2018 test standards.