Advanced Damping Solution for Critical Applications

The LQHDR 50kV/5kΩ damping resistor delivers ultra-low partial discharge LT 5pC performance in high-voltage test systems. Engineered for impulse testing, transformer diagnostics, and PD measurement, its compact Ø100×350mm design optimizes space-constrained test setups while maintaining strict IEC 60270 compliance.

Technical Specifications

Performance Advantages

Ultra-Low PD Design

Specialized corona suppression ensures partial discharge levels below 5pC at rated voltage, eliminating measurement interference in sensitive PD detection systems per IEC 60270 Class II.

Optimized Thermal Management

Aluminum nitride core with helical winding dissipates 150W heat load during operation. Internal temperature stays ≤80°C during 60-minute duty cycles at 50kV.

Space-Efficient Construction

Compact Ø100×350mm cylinder (weight LT 5kg) enables integration in mobile test carts or confined substation environments without performance compromise.

Duty Cycle Operation

Operational Protocol (per IEEE 4-2013):

1. Operate at 100% rated voltage (50kV) and current (0.02A) for 60 minutes maximum

2. Cooling period: Minimum 60 minutes at zero load

3. Maximum 4 complete cycles per 24-hour period

⚠️ Critical Note: Exceeding 60-minute continuous operation voids warranty. Ambient temperature must not exceed 40°C during operation.

Physical Dimensions

Compact Design: Ø100mm × 350mm Height

Mounting: M10 terminals with 50mm creepage distance

Weight: 4.8kg (including terminals)

Figure: Space-optimized design for test benches and field applications

Industrial Applications

• Transformer Testing: Damping switching surges in IEC 60076-3 induced voltage tests

• Cable PD Detection: Reference impedance for 35-150kV cable partial discharge measurement

• Impulse Generators: Waveform shaping in 50kV lightning impulse tests (1.2/50μs)

• Research Laboratories: Precision load for HVDC component validation

Field Data: Reduced oscillation by 89% in 66kV GIS commissioning tests.

Compliance & Safety

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

• Environmental Protection: IP55 rated (dust/water jet resistant)

• Safety Standards: CAT III 1000V / CAT IV 600V

• EMC Compliance: EN 61326-1 for test equipment

Includes dual-stage over-temperature protection with auto-cutoff at 85°C.