150kV ~ 400kV

LQHDR 300kV/5kΩ/1A High Voltage Damping Resistor | 5kW Continuous Duty

Industrial-grade LQHDR 300kV/5kΩ/1A damping resistor with 5kW power capacity. Designed for 60min continuous operation at full 300kV/1A rating. Ideal for surge protection and waveform control in HV systems.

US$ 2,860.00
Lead time: 30 days

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Product Details

Product Tags

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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