High-Power Damping for Industrial Test Systems

The LQHDR 50kV/5kΩ/0.2A damping resistor delivers robust performance with ultra-low partial discharge (<5pc) in="" high-current="" test="" environments.="" engineered="" for="" impulse="" generators="">

Technical Specifications

Performance Advantages

High-Current Capability

Designed for 0.2A continuous current (10kW power), featuring heavy-duty terminals and low-inductance windings to minimize voltage drop during high-energy tests.

Strict PD Control

Corona-free construction maintains partial discharge below 5pC even at 50kV, critical for accurate PD measurements in HV equipment testing.

Optimized Thermal Design

Forced-air cooling fins and ceramic composite core enable efficient heat dissipation during 15-minute high-power operations. Internal temperature limited to 85°C.

Duty Cycle Operation

Operational Protocol (per IEEE 4-2013):

1. Operate at 100% rated voltage (50kV) and current (0.2A) for 15 minutes maximum

2. Cooling period: Minimum 45 minutes at zero load

3. Maximum 8 cycles per 24-hour period

⚠️ Critical Note: Continuous operation beyond 15 minutes may cause thermal damage. Ambient temperature must be ≤40°C.

Physical Construction

Dimensions: Ø100mm × 350mm Height

Weight: 9.5kg (including heavy-duty terminals)

Mounting: M12 terminals with 60mm creepage distance

Figure: Heavy-duty design for high-power applications

Industrial Applications

• Circuit Breaker Testing: Damping switching surges in 50kV/20kA test circuits

• Transformer Impulse Tests: Waveform control in IEC 60076-3 lightning impulse tests

• HVDC Converter Stations: Harmonic filtering in 50kV DC systems

• Research Laboratories: Load banks for high-power component validation

Field Data: Achieved 0.5% waveform accuracy in 40kA short-circuit tests.

Safety & Compliance

• Dielectric Strength: 90kV/min (IEC 61010-1)

• Environmental Rating: IP54 (dust and splash resistant)

• Safety Standards: CAT IV 1000V

• Over-Temperature Protection: Automatic cutoff at 90°C

Terminal guards included for arc-flash protection.