Engineered for Precision High-Voltage Systems

The LQHDR damping resistor delivers critical surge protection in transformer testing, switchgear diagnostics, and partial discharge measurement systems. With ultra-low PD levels and robust thermal management, it ensures signal integrity under extreme electrical stress.

Technical Specifications

Thermal Performance & Operating Conditions

⏱️ Duty Cycle

• 100% Voltage: 60 minutes continuous operation

• Continuous Operation: 80% rated voltage/current

🔥 Temperature Rise

• Resistor body: ≤80K @ 100% load

• Transformer windings: ≤65K

• Oil surface: ≤55K

Safety Note: All measurements comply with IEC 60076-14 thermal limits. Temperature margins include 15% safety buffer for overload scenarios.

Key Applications

⚡ Partial Discharge Measurement Systems

Ensures signal fidelity with <3pC noise floor during HV transformer and cable PD testing. Essential for compliance with IEC 60270 calibration requirements.

🏭 Impulse Voltage Generators

Damps oscillations in Marx generators and lightning impulse circuits. 10KΩ resistance optimizes waveform shaping for 1.2/50μs impulses per IEC 61083-2.

🔬 High-Voltage Research Labs

Provides stable resistive loading in DC/AC test rigs up to 50kV. Non-inductive design prevents waveform distortion at 50Hz.

Design Advantages

• Oil-immersed construction: Mineral oil cooling extends service life

• Corona-free terminals: Silicone-insulated connectors rated for 70kV BIL

• Modular design: Stackable for voltages up to 400kV

• Self-healing insulation: Class H (180°C) epoxy composite

Maintenance Protocol

1. Verify resistance tolerance (±1%) biannually

2. Perform IR test: >1000MΩ @ 5kV DC

3. Replace cooling oil every 5 years (IEC 60296)

4. Calibrate with reference divider per IEC 60060-2