>400kV Range

LQHDR 800kV/5kΩ/0.5A Damping Resistor | Ultra-Low PD Level | 20kW HV Testing Component

Technical specifications for LQHDR 800kV/5kΩ damping resistor: 0.5A rating, 20kW capacity, <3pC PD level at 80% voltage, and advanced thermal management.

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Product Details

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LQHDR Series: 800kV/5kΩ Precision Damping Resistor

Engineered for critical high-voltage testing applications requiring ultra-low partial discharge levels and stable performance at extreme voltages.

Technical Specifications

Parameter	Specification
Rated Voltage	800kV AC/DC
Nominal Resistance	5kΩ ±0.75%
Rated Current	0.5A
Rated Power	20kW at 50Hz
Partial Discharge (PD) Level	<5pC at 100% U_H (full 800kV) <3pC at 80% U_H (640kV)
Operating Duration	30 minutes at 100% rated voltage/current
Temperature Rise	<100K at continuous 100% load

Performance Highlights

Ultra-Low Partial Discharge

Industry-leading PD performance certified per IEC 60270:

<5pC at full 800kV test voltage
<3pC at 640kV (80% U_H)
EMI-shielded measurement connections

High-Power Thermal Management

Maintains <100K temperature rise at 20kW power dissipation through:

Optimized forced-air cooling channels
Ceramic-encased resistance elements
Distributed heat-sink geometry

Structural Design Features

Multi-Stage Shielding: Triple corona rings at critical voltage points
Modular Construction: Stackable sections for transport and maintenance
Precision Winding: Nickel-chromium alloy on high-dielectric cores
EMI Containment: Integrated Faraday cage elements

Critical Applications

Ultra-high-voltage transformer PD testing
GIS (Gas-Insulated Substation) commissioning
HVDC converter station dielectric verification
Power cable system partial discharge measurement
High-energy research facility test systems

Performance Verification Data

Test Condition	Result
Continuous 800kV operation	30 minutes stable (±0.5% resistance)
Thermal imaging at 20kW	Max hotspot: 98K above ambient
PD measurement at 640kV	2.7pC average (IEC 60270 compliant)
Impulse withstand	1.2MV/50µs lightning impulse

Safety & Compliance

IEC 60060-1:2010 High-voltage test techniques
IEEE 4-2013 Standard for HV testing
IEC 60270:2015 Partial discharge measurements
EN 62155:2003 Hollow pressurized ceramic insulators

Installation Requirements

Minimum 3.8m clearance to grounded objects
Dedicated 150A cooling system power supply
Ambient temperature ≤35°C during operation
Monthly infrared thermography inspections
Biannual calibration certification required

Voltage-PD Performance Relationship

Test Voltage	Max PD Level
100% (800kV)	<5pC
90% (720kV)	<3.5pC
80% (640kV)	<3pC

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