LQHDR 400kV/1kΩ/2A Damping Resistor: Engineering Excellence for High Voltage Systems

Product Overview

The LQHDR series 400kV/1kΩ/2A damping resistor sets new standards in high-voltage test equipment with its continuous duty capability and ultra-low partial discharge characteristics. Designed for critical applications in power transformer testing, impulse generators, and substation diagnostics, this resistor ensures operational safety and measurement accuracy under extreme electrical stress.

Technical Specifications

Innovative Design Features

Advanced Thermal Management

• Honeycomb Structure: Nickel-chromium wire wound on epoxy boards enables optimal air circulation

• Heat Dissipation: 30% greater cooling efficiency than solid-core designs

• Temperature Stability: Maintains resistance tolerance within ±0.5% from 20°C to 135°C

Corona Prevention System

• Triple shielding rings (end/middle/end configuration)

• 180° rotatable corona covers for flexible installation

• Customizable length to match system dimensions

Mechanical Robustness

• Epoxy composite base maintains structural integrity at 155°C

• Vibration-resistant winding technique

• Corrosion-resistant nickel-chromium alloy elements

Performance Advantages

Ultra-Low Partial Discharge

The <3pC PD rating at 400kV ensures:

• Uncompromised measurement accuracy in sensitive tests

• Prevention of electromagnetic interference (EMI)

• Extended service life through reduced insulation degradation

Continuous Duty Capability

• No derating required for extended operation

• Stable performance in 24/7 testing environments

• Eliminates cooling downtime between tests

Applications

• Transformer Testing: Induced voltage tests (IVT) and PD measurement

• Impulse Generators: Wavefront control in 1.2/50μs lightning tests

• Cable Diagnostics: Damping for partial discharge localization

• HVDC Systems: Valve testing and converter station commissioning

Installation & Maintenance

Mounting Requirements

• Minimum clearance: 3.2 meters (400kV applications)

• Horizontal orientation with free airflow

• Ambient temperature: -40°C to +50°C

Operational Protocols

1. Pre-commissioning IR scan (minimum 100 GΩ at 5kV DC)

2. Quarterly thermographic inspections

3. Annual resistance verification (±1% tolerance)

Why Choose LQHDR Series?

• Industry-leading <3pC partial discharge performance

• Patented honeycomb cooling for continuous operation

• Adaptable shielding system prevents corona discharge

• Full compliance with IEC/IEEE safety standards

Conclusion

The LQHDR 400kV/1kΩ/2A damping resistor redefines reliability in high-voltage testing with its unmatched combination of continuous duty capability, ultra-low partial discharge, and innovative thermal management. Its robust construction and adaptable shielding system make it the optimal choice for utilities, manufacturers, and testing laboratories demanding precision and safety in extreme electrical environments.