150kV ~ 400kV
LQHDR Series 400kV/1kΩ/4A High Power Damping Resistor
Core Technical Specifications
Parameter | Value | Verification |
---|---|---|
Rated Voltage | 400kV AC RMS | IEC 60060-1 |
Nominal Resistance | 1kΩ ±1% | IEC 60115-1 |
Rated Current | 4A continuous | |
Power Rating | 16kW @ 60Hz | P = I2R = 42 × 1000 = 16kW |
Duty Cycle | 60min ON / 90min OFF | |
Temperature Rise | ≤100K at full load | IEEE C57.12.90 |
Thermal Stability | No structural degradation at max temp | |
BIL Rating | 650kV | IEC 60071 |
Partial Discharge | <5pC @ 400kV | IEC 60270 |
Robust Safety Engineering
Fail-Safe Insulation
Triple-layer encapsulation: RTV silicone + mica tape + epoxy
Non-cascading failure design
Arc-quenching matrix in core structure
Thermal Protection
Temperature-independent mechanical strength
Overheat cutoff at 150°C surface temp
Thermal runway prevention circuit
Safety Certification: Compliant with IEC 61936 for HV installations
Advanced Cooling System
Multi-path Cooling: Radial fins + axial airflow channels
Phase-change Material: Integrated thermal buffer capsules
High-emissivity Surface: Black ceramic coating (ε=0.92)
Thermal Performance: 100K rise at 16kW with 25°C ambient
Electrical Performance
Characteristic | Value |
---|---|
Inductance | <5μH |
di/dt Capability | >1010 A/s |
Step Response | <15ns 10-90% rise time |
TCR | ±150 ppm/°C (-40°C to +150°C) |
Overload Capacity | 125% for 5min (20kW) |
Frequency Response | DC - 20MHz (±3dB) |
Industrial Applications
Power Generation
Surge suppression in 500MW+ turbine generators and HVDC converter stations
High Power Testing
Critical component for 400kV impulse generators and transformer test rigs
Grid Infrastructure
Protection for ultra-high voltage substations (345kV+) and reactive power compensation systems
Mechanical Design
Construction
Modular segmented design
Stainless steel core with copper cladding
Corona-free graded rings
Terminal System
Top: Ø800mm corona shield
Base: Dual M24 flange terminals
Torque spec: 80Nm ±5%
Environmental Rating: IP55 (indoor/outdoor operation)
Installation Protocol
Maintain minimum 3.2m clearance (8mm/kV × 400kV) to earthed surfaces
Mount on insulated platform rated for 500kV
Use corona-free connectors with smooth radius profiles
Ground connection: ≥50mm² copper cable to < 1Ω earth grid
Implement thermal monitoring with IR sensors
Safety & Compliance
Dielectric test: 480kV AC for 1min (20% overvoltage)
Short-circuit withstand: 40kA peak/100ms
Arc-flash protection: Class 3 containment
Seismic rating: IEEE 693 Category II
Material safety: RoHS 3 / REACH SVHC-free
Operational Parameters
Condition | Requirement |
---|---|
Ambient Temperature | -30°C to +45°C |
Relative Humidity | < 90% non-condensing |
Altitude | < 1500m ASL (derate 1%/100m above) |
Cooling Recovery | 120min after full-duty cycle |