📋 Case Study
Underground Copper Mine DC Fast-Charging Hub (Chile)
Limited space in existing service drift; seismic zone requiring vibration-isolated mounting; strict MSHA Class I Div 2 hazardous area compliance
🏗️ Project Overview
Installation of 12× 350 kW DC chargers for 40-ton haul trucks at El Teniente
🎯 Challenge
Limited space in existing service drift; seismic zone requiring vibration-isolated mounting; strict MSHA Class I Div 2 hazardous area compliance
🔧 Design Approach
Modular pre-fab charging cavern with explosion-proof enclosures, redundant grounding, and fiber-optic isolated control network; 1500 V DC architecture with active harmonic filtering
📐 Design Diagram
AI-generated project design illustration
📐 Key Calculations
Ground Fault Loop Impedance
2 × Conductor Length × Resistivity / Cross-Section
Result: 0.18 Ω
Meets IEC 61851-23 <0.2 Ω requirement
Seismic Mounting Load Factor
Static Load × Seismic Coefficient (0.4g)
Result: 2.4× design load
Validated via ANSYS structural simulation
📊 Results
Zero charging-related incidents over 22 months; 99.2% charger uptime; 27% faster turnaround vs. diesel refueling💡 Lessons Learned
- •Pre-certified explosion-proof components accelerated commissioning by 11 weeks
- •Harmonic filters reduced transformer heating by 18°C
- •Remote diagnostics cut mean time to repair from 4.2 hrs to 38 min
✅ Key Takeaways
- 1Pre-certified explosion-proof components accelerated commissioning by 11 weeks
- 2Harmonic filters reduced transformer heating by 18°C
- 3Remote diagnostics cut mean time to repair from 4.2 hrs to 38 min