Critical Component for High-Voltage Systems

The LQHDR damping resistor provides essential surge protection in transformer testing, switchgear diagnostics, and partial discharge measurement systems. Engineered for 50kV applications with ultra-low PD levels, it ensures signal integrity in demanding electrical environments.

Technical Specifications

Operational Parameters

Thermal Performance

• Full load operation: 60 minutes continuous @ 100% rated voltage

• Sustained operation: Continuous @ 80% rated voltage/current

• Max. temperature rise: ≤80K (resistor body) @ 100% load

System Temperature Limits

• Transformer windings: ≤65K temperature rise

• Oil surface: ≤55K temperature rise

Key Applications

⚡ Transformer Testing Systems

Provides precise damping for dielectric tests and PD measurements on power transformers up to 132kV class.

🔬 Partial Discharge Detection

Ensures measurement accuracy with <5pC background noise during critical HV cable and GIS testing.

🏭 Impulse Voltage Circuits

Controls wavefront timing in lightning impulse generators (1.2/50μs) per IEC 60060-1 standards.

Design Features

• Low-inductance design: Minimizes waveform distortion at 50Hz

• Oil-immersed construction: Mineral oil cooling for thermal stability

• Corona-free terminals: Silicone-insulated connectors (70kV BIL)

• Modular stacking: Series connection for voltages up to 400kV

Safety & Maintenance

1. Perform dielectric tests annually: >1000MΩ @ 5kV DC

2. Verify resistance tolerance (±1%) every 6 months

3. Monitor oil quality per IEC 60296 standards

4. Calibrate with reference divider per IEC 60060-2

Important: Always maintain proper grounding - NFPA 70E requires ground verification before HV testing.