150kV ~ 400kV
LQHDR Series 300kV/5kΩ/1A High Voltage Damping Resistor
Core Technical Specifications
| Parameter | Value | Standard |
|---|---|---|
| Rated Voltage | 300kV AC RMS | IEC 60060-1 |
| Nominal Resistance | 5kΩ ±3% | IEC 60115-1 |
| Rated Current | 1A continuous | |
| Power Rating | 5kW @ 50Hz | (P = I2R = 12 × 5000) |
| Duty Cycle | 60min ON / 30min OFF | |
| Temperature Rise | ≤75K at full load | IEC 60076-7 |
| Partial Discharge | <5pC @ 300kV | IEC 60270 |
| Inductance | <10μH | |
| BIL Rating | 450kV | IEC 60071 |
Advanced Design Features
Dual-Cooling Technology: Finned aluminum housing + thermal convection channels
Non-inductive Construction: Bifilar winding with mica insulation
Corona Suppression: Graded ring terminals with RTV silicone coating
High di/dt Capability: >5×109 A/s for lightning impulse protection
Moisture-Resistant: Hermetically sealed resistance elements
Performance Characteristics
| Parameter | Value |
|---|---|
| Voltage Coefficient | <0.01%/kV |
| TCR (Temp Coefficient) | ±150 ppm/°C (-30°C to +105°C) |
| Overload Capacity | 125% current for 10min |
| Dielectric Strength | 350kV AC for 1min (routine test) |
| Step Response | <20ns 10-90% rise time |
Primary Applications
Impulse Voltage Testing
Wavefront control in lightning impulse generators (1.2/50μs) and switching surge circuits
Power System Protection
Surge suppression for HV transformers and gas-insulated switchgear
Research & Measurement
Termination for capacitive voltage dividers and partial discharge detectors
Mechanical Specifications
| Characteristic | Value |
|---|---|
| Terminal Type | Dual M16 flange connectors |
| Mounting | Vertical orientation required |
| Clearance Distance | Min. 1.8m to ground |
| Creepage Distance | 250mm/kV (75m total) |
| Environmental Rating | IP56 (dust protected/water resistant) |
Safety & Compliance
Short-circuit withstand: 15kA peak / 100ms
Arc-flash containment: Stainless steel mesh shielding
Material certification: RoHS 3 / REACH compliant
Seismic rating: IEC 60068-3-3 Class 2
Installation Guidelines
Maintain minimum 2m clearance to adjacent equipment
Use corona-free connections (smooth-radius connectors)
Apply 35Nm torque to terminal hardware
Connect to low-impedance ground (<5Ω) using 25mm² cable
Verify base levelness within ±0.5°
Operational Parameters
| Condition | Requirement |
|---|---|
| Ambient Temperature | -25°C to +40°C |
| Relative Humidity | <85% non-condensing |
| Altitude | <1000m ASL (derate 1%/100m above) |
| Cooling Recovery | 30min after 60min operation |
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