LQHDR 550kV/0.2kΩ/2A Grounded Damping Resistor: Ultimate Defense for High-Current Faults

Engineering Significance

Designed for critical fault scenarios, the LQHDR 550kV/0.2kΩ/2A grounded damping resistor provides unparalleled protection during high-voltage short-circuit events. This specialized component safeguards transformers, switchgear, and transmission systems by controlling transient currents while maintaining thermal stability under extreme electrical stress.

Technical Specifications

Core Protection Features

Short-Circuit Current Management

• Withstands HV-side metal-to-ground faults

• Controls transient currents during arc faults

• Prevents equipment damage from di/dt surges

Advanced Thermal Performance

• Maintains stability during fault conditions

• Specialized alloy winding handles 2A continuous current

• Temperature rise controlled within safe limits

Grounded System Advantages

• Direct earth connection for fault current pathing

• Reduces step/touch potential hazards

• Simplifies system grounding coordination

Design Innovations

Electrical Architecture

• Low-resistance design (200Ω) for high-current handling

• Non-inductive bifilar winding minimizes reactance

• Graded shielding for voltage distribution

Robust Mechanical Construction

• Solid-copper grounding terminals

• Crush-resistant ceramic core

• Corona-resistant silicone coatings

Thermal Management System

• Forced-air cooling compatibility

• Helical fin design for maximum convection

• Thermal runaway prevention circuitry

Critical Applications

Transformer Protection Systems

• Neutral grounding resistors for HV transformers

• Fault current limitation during LV-side shorts

• Damping for switching surges

High-Risk Environments

• Generator step-up transformer protection

• HVDC converter station fault management

• Substation circuit breaker control

Operational Specifications

Installation Requirements

• Minimum clearance: 5.0 meters (550kV)

• Direct grounding via 50mm² copper cable

• Horizontal mounting for optimal cooling

Fault Response Protocol

1. Designed for automatic fault engagement

2. 60-minute continuous operation capability

3. Post-event resistance verification required

Performance Advantages

Why This Resistor?

• Specialized design for short-circuit conditions

• Industry-leading 2A continuous current at 550kV

• Integrated grounding for fault current management

• Robust construction for critical protection applications

Maintenance Protocol

1. Monthly visual inspection of grounding connections

2. Quarterly resistance verification (±2% tolerance)

3. Annual thermographic inspection under load

4. Post-fault dielectric strength testing

Conclusion

The LQHDR 550kV/0.2kΩ/2A grounded damping resistor delivers unmatched protection in high-risk electrical environments. Its specialized design for short-circuit conditions, integrated grounding system, and robust 2A continuous current capacity make it essential for utilities, generator facilities, and transmission operators requiring fail-safe protection for critical infrastructure. By combining advanced thermal management with fault-current engineering, this resistor sets new standards for safety in high-voltage power systems.