150kV ~ 400kV
LQHDR Series 350kV/5kΩ/0.714A High Voltage Damping Resistor
Technical Specifications
| Parameter | Value | Verification |
|---|---|---|
| Rated Voltage | 350kV AC RMS | IEC 60060-1 |
| Nominal Resistance | 5kΩ ±2% | IEC 60115-1 |
| Rated Current | 0.714A continuous | |
| Power Rating | 2.55kW @ 50Hz | P = I2R = (0.714)2 × 5000 = 2.55kW |
| Duty Cycle | 60min ON / 45min OFF | |
| Temperature Rise | ≤100K at full load | IEC 60076-7 |
| Partial Discharge | <2pC @ 350kV | IEC 60270 |
| Voltage Coefficient | <0.008%/kV | |
| BIL Rating | 525kV | IEC 60071 |
Thermal Management System
Advanced Cooling Design
Helical aluminum fins (12mm pitch)
Vertical airflow channels
Black anodized surface (ε=0.85 emissivity)
Temperature Performance
100K max rise at 2.55kW load
Thermal time constant: 18 minutes
Ambient range: -30°C to +50°C
Thermal Validation: Tested per IEEE C57.131 with IR thermography
Electrical Performance
| Characteristic | Value |
|---|---|
| TCR (Temp Coefficient) | ±200 ppm/°C (-40°C to +125°C) |
| Inductance | <7μH |
| Step Response | <30ns 10-90% rise time |
| di/dt Capability | >3×109 A/s |
| Overload Capacity | 120% for 10min (3.06kW) |
Mechanical Design
Dimensions & Construction
Cylindrical form factor
Stainless steel core
Aluminum oxide coated surface
Terminal System
Top: Corona shield (Ø500mm)
Base: M20 flange terminals
Torque spec: 40Nm ±5%
Primary Applications
High Power Laboratories
Critical component in 350kV impulse generators (0.84/2100μs switching surge)
Transformer Testing
Damping for resonant frequency tests on 500MVA+ transformers
HVDC Systems
Surge protection in ±350kV converter stations and VSC installations
Installation Protocol
Maintain 2.45m clearance (7mm/kV × 350kV) to earthed surfaces
Mount on insulated pedestal (≥200kV rating)
Apply UV-resistant silicone grease to terminals
Ground connection: ≥25mm² copper cable to
<5ω earth="">Verify vertical alignment with
<1° deviation="">
Safety & Compliance
Dielectric test: 420kV AC for 1min (20% overvoltage)
Short-circuit withstand: 12kA peak/80ms
Arc-flash protection: Grade 2 containment
Environmental rating: IP54 (indoor/outdoor)
Seismic rating: IEC 60068-3-3 Class 1
Operational Limits
| Parameter | Operating Range |
|---|---|
| Ambient Temperature | -30°C to +50°C |
| Relative Humidity | <95% non-condensing=""> |
| Altitude | <2500m asl=""> |
| Cooling Recovery | 60min after full-duty cycle |
