High-Power Solution for Demanding HV Applications

Engineered for industrial-scale testing, the LQHDR 50kV/5kΩ/4A damping resistor delivers 200kW power handling in transformer testing, circuit breaker validation, and high-current impulse systems. With robust thermal management and ultra-low PD levels, it withstands extreme electrical stress in 60Hz applications.

Technical Specifications

Operational Parameters

⏱️ Duty Cycle & Thermal Performance

• Full load operation: 60 minutes continuous @ 50kV/4A (100% UH/IH)

• Max. surface temperature rise: ≤100K @ continuous full current

• Cooling system: Forced-air or oil-immersion required for sustained operation

Important: Temperature rise measured per IEC 60076-14 using infrared thermography. Requires minimum 1m clearance for heat dissipation.

High-Current Applications

⚡ Power Transformer Testing

Handles inrush currents during short-circuit tests on 100MVA+ transformers. Compatible with IEC 60076 standards.

🔌 Circuit Breaker Validation

Damps arc energy during HV breaker interruption tests at 50kV/4A. Critical for ANSI C37.09 compliance.

⚡️ Impulse Current Generators

Manages 4A continuous discharge in lightning current simulation (8/20μs) per IEC 62305.

Design Features

• Industrial cooling fins: Extruded aluminum with 200% surface area enhancement

• Parallel resistive elements: 16-section design for current sharing

• Corona suppression: Graded-ring terminals rated for 70kV BIL

• Modular design: Stackable configuration for 200kV+ systems

• Thermal monitoring: Integrated K-type thermocouple ports

Installation & Safety

1. Maintain minimum 1m clearance from other equipment

2. Implement forced-air cooling (≥2m³/min airflow) for >30 minute operations

3. Verify grounding resistance

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4. Use IR thermometer to monitor surface temperature during initial tests

Warning: Never exceed 60-minute continuous operation at full load. Surface temperatures may reach 150°C - use thermal protection gear.

Maintenance Protocol

• Monthly resistance verification (±2% tolerance)

• Quarterly thermal imaging inspection

• Annual dielectric test: >500MΩ @ 10kV DC

• Re-torque terminals to 25Nm every 6 months