Technical Specifications

• Rated Voltage: 270kV AC (50/60Hz)

• Nominal Resistance: 2kΩ ±2%

• Rated Current: 1.5A continuous

• Power Rating: 405kW peak (270kV × 1.5A)

• Partial Discharge (PD):

• <2pC at 270kV (100% rated voltage)

• <1pC at 235kV (87% rated voltage)

• Operating Duration: 30 minutes at 270kV/1.5A continuous load

• Thermal Design: Forced-air cooling required for full power operation

• Compliance Standards: IEC 60270:2015 (PD), IEC 60060-1:2010 (HV testing)

Key Performance Advantages

• High Current Capability: 1.5A rating for power system testing

• Ultra-Low PD Performance: Industry-leading discharge levels for sensitive measurements

• Robust Thermal Management: Dual-path cooling channels integrated in core design

• Precision Resistance: ±2% tolerance across full operational range

• High di/dt Handling: Stable performance under rapid current transients

Application Scenarios

Cooling System Requirements

Mandatory cooling configuration for full-power operation:

• Airflow: Minimum 200 CFM axial flow

• Ducting: 300mm diameter aluminum ducts

• Temperature Monitoring: Integrated Type K thermocouples

• Safety Interlock: Automatic shutdown at 120°C core temperature

Design Note: The LQHDR-270/2K utilizes proprietary helical fin design that increases heat transfer surface by 300% compared to conventional resistors.

Installation Specifications

• Mounting: Vertical orientation recommended

• Clearances:

• 2.5m phase-to-phase minimum

• 3.0m to grounded structures

• Connections: Water-cooled terminals (M30 flange)

• Environmental: IP55 rated enclosure

• Altitude: Derate 1% per 100m above 1000m ASL

Safety & Compliance

• IEC 61010-1:2010 CAT IV 300kV certification

• Partial discharge verified per IEC 60270 Class I

• Short-circuit withstand: 25kA/100ms

• Dielectric strength: 350kV AC for 1 minute

• Fire resistance: UL94 V-0 rated materials

Operational Protocol

1. Pre-cooling: Initiate airflow 5 minutes before energization

2. Ramp-up: Increase voltage at ≤5kV/s rate

3. Continuous Monitoring: Core temperature, airflow velocity

4. Cooldown: Maintain airflow for 10 minutes post-operation

5. Maintenance: Quarterly insulation resistance check (≥10GΩ)