LQHDR Series 400kV Damping Resistors: Critical Components for High Voltage Testing

Introduction to Damping Resistors

Damping resistors are essential safety components in high-voltage test systems, suppressing oscillations and limiting transient overvoltages. The LQHDR400kV/5kΩ/8A series meets rigorous industrial demands for reliability and precision in applications ranging from power transformer testing to lightning impulse generators.

Technical Specifications: LQHDR400kV/5kΩ/8A

Core Applications

1. Impulse Voltage Generators

Controls wavefront time in lightning impulse (1.2/50μs) and switching impulse (250/2500μs) tests per IEC 60060 standards. Key benefits:

• Prevents overshoot in Marx generator circuits

• Minimizes ringing effects in test objects

2. Transformer Testing Systems

Critical for induced voltage tests (IVT) and partial discharge measurements:

• Enables precise PD measurements <2pC

• Protects test windings from resonant overvoltages

Design & Safety Features

Advanced Construction

• Non-inductive winding: Ceramic core with nickel-chrome alloy wire

• Voltage distribution: Graded ring electrodes eliminate corona discharge

• Thermal management: Aluminum radiator fins maintain temperature below 120°C at full load

Safety Compliance

• Double insulation system (IEC 61010-1)

• Creepage distance: ≥5mm/kV

• Short-circuit withstand: 25kA/100ms

Operational Guidelines

Installation Requirements

• Minimum clearance: 3.5 meters (400kV)

• Horizontal mounting orientation

• Ambient temperature: -25°C to +40°C

Maintenance Protocol

1. Infrared thermography scans quarterly

2. Resistance tolerance verification (±1%) annually

3. Surface cleaning with isopropyl alcohol

Why Partial Discharge <2pC Matters

The ultra-low PD specification ensures:

• Accurate measurement in sensitive HV tests

• Prevention of electromagnetic interference (EMI)

• Extended service life through reduced insulation stress

Industry Applications

• Power Utilities: Circuit breaker timing tests

• Cable Manufacturers: Partial discharge localization

• Research Labs: HVDC valve testing

Conclusion

The LQHDR400kV/5kΩ/8A damping resistor sets the benchmark for high-voltage testing safety with its 400kV rating, precise 5kΩ resistance, and industry-leading <2pC partial discharge performance. Its optimized thermal design and strict compliance with IEC/IEEE standards make it indispensable for critical test applications requiring uncompromised reliability.