LQHDR 500kV/5kΩ/1.5A Protecting Resistor: Ultimate Defense for High Voltage Systems

Critical Component for Electrical Safety

Protecting resistors are indispensable in high-voltage test circuits, preventing equipment damage from transient overvoltages and oscillations. The LQHDR 500kV/5kΩ/1.5A model delivers exceptional performance with its 11.25kW power handling capacity and industry-leading partial discharge characteristics, making it ideal for transformer testing, impulse generators, and substation diagnostics.

Technical Specifications

Breakthrough Performance Features

Advanced Partial Discharge Control

• 500kV performance: <5pC ensures measurement accuracy

• Reduced voltage operation: <3pC at 400kV (80% rated)

• Triple-shielded grading rings eliminate corona effects

High-Efficiency Power Handling

• 11.25kW continuous power for 60-minute operations

• Aluminum nitride ceramic core for thermal stability

• Forced-air cooling compatibility

Multi-Frequency Operation

Maintains precision across diverse testing regimes:

• Standard power frequencies (50/60Hz)

• Enhanced test ranges (100/120Hz)

• ±0.5% resistance tolerance across full spectrum

Design Innovations

Electrical Architecture

• Non-inductive bifilar winding (NiCr alloy)

• Voltage-gradient optimized shielding electrodes

• SF₆-compatible insulation system

Thermal Management System

• Helical cooling fins increase surface area by 40%

• Temperature rise limited to <100K at full load

• Automatic derating above 40°C ambient

Critical Applications

Transformer Protection Systems

• Induced voltage tests (IVT) at 100-120Hz

• Partial discharge measurement circuits

• Lightning impulse wavefront shaping

Specialized High-Voltage Testing

• HVDC converter station commissioning

• Gas-insulated substation (GIS) diagnostics

• Cable factory acceptance testing

Operational Excellence

Installation Requirements

• Minimum clearance: 4.5 meters (500kV)

• Vertical mounting for convection cooling

• Ambient temperature: -30°C to +45°C

Maintenance Protocol

1. Pre-operational IR scan (≥10 GΩ at 5kV DC)

2. Quarterly thermographic inspections

3. Annual PD performance validation

Performance Comparison

Why Choose This Resistor?

• Industry-leading 11.25kW power capacity

• Progressive PD reduction (<5pC@100% → <3pC@80%)

• Full-spectrum frequency compatibility

• Certified thermal rise <100K under continuous load

Conclusion

The LQHDR 500kV/5kΩ/1.5A protecting resistor redefines safety margins in high-voltage testing with its unmatched 11.25kW power handling, progressive partial discharge control, and multi-frequency precision. Its optimized thermal design and strict adherence to IEC/IEEE standards make it essential for utilities, testing laboratories, and manufacturers operating at the forefront of high-voltage technology.