150kV ~ 400kV

LQHDR 350kV/10kΩ/0.25A High Voltage Damping Resistor | Compact 625W Design

Compact LQHDR 350kV/10kΩ/0.25A damping resistor with 625W power rating. Designed for 60min continuous operation at full 350kV rating. Cylindrical design (Ø350/400×1000mm) under 40kg weight.

US$ 2,469.00
Lead time: 30 days

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Product Details

Product Tags

LQHDR Series 350kV/10kΩ/0.25A High Voltage Damping Resistor

Technical Specifications

Parameter	Value	Standard
Rated Voltage	350kV RMS	IEC 60060-1
Nominal Resistance	10kΩ ±3%	IEC 60115-1
Rated Current	0.25A continuous
Power Rating	625W @ 50Hz	(P = I²R = 0.25² × 10,000)
Continuous Duty	60min at 100% load
Dimensions	Ø350/400 × 1000mm	Tapered design
Weight	<40kg
Power Density	15.6 W/kg	Industry benchmark
Temperature Rise	≤65K at full load	IEC 60076

Advanced Design Features

Aerodynamic Profile: Tapered cylindrical design (Ø350→400mm) reduces corona discharge
High Voltage Gradient: Optimized for 3.5kV/mm field distribution
Low-Inductance Construction: <8μH for fast transient response
Integrated Cooling: Longitudinal fins with 30% increased surface area
Corona-Free Terminals: Hemispherical electrodes with RTV coating

Performance Characteristics

Characteristic	Value
Voltage Coefficient	<0.005%/kV
TCR (Temp Coefficient)	±100 ppm/°C (-30°C to +85°C)
Partial Discharge	<2pC @ 350kV
Step Response	<25ns 10-90% rise time
Overload Capability	150% current for 5min

Mechanical Configuration

Dimensions

Height: 1000mm

Base Ø: 400mm

Top Ø: 350mm

Surface Area: 1.2m²

Terminals

Top: Corona ring (Ø600mm)

Bottom: M16 flange

Ground Lug: M10 stainless

Mounting

Base plate: 4×Ø18mm holes

Torque: 30Nm ±10%

Orientation: Vertical only

Primary Applications

HV Laboratories

Wavefront shaping in 350kV impulse generators (1.2/50μs)

Transformer Testing

Damping for resonant test systems and partial discharge circuits

Transmission Systems

Surge protection in GIS installations and HVDC converter stations

Installation Requirements

Maintain minimum 2.1m clearance to grounded surfaces (6mm/kV)
Install on insulated platform (≥150kV rating)
Apply dielectric grease to flange connections
Ensure base levelness ≤0.5° deviation
Connect ground using ≥16mm² copper cable

Safety & Compliance

Dielectric test: 420kV AC for 1min (20% overvoltage)
BIL rating: 550kV (IEC 60071-1)
Short-circuit withstand: 8kA peak/100ms
Environmental rating: IP55 (dust/water protected)
Flame resistance: UL94 V-0 compliant

Operational Guidelines

Parameter	Range
Ambient Temperature	-25°C to +40°C
Relative Humidity	<80% non-condensing
Altitude	<2000m ASL
Cooling Recovery	45min after 60min operation
Re-energization Delay	Minimum 90min at full cycle

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