📋 Case Study

Chilean Copper Mine Grid Interconnection Hardening

Frequent grid instability due to solar thermal-induced voltage sags and dust-induced insulator flashovers

🏗️ Project Overview

Escondida Expansion Phase III – Atacama Desert

🎯 Challenge

Frequent grid instability due to solar thermal-induced voltage sags and dust-induced insulator flashovers

🔧 Design Approach

Dual 132 kV feeders with dynamic VAR compensation + GIS substation enclosures rated IP65 + anti-static coating

📐 Key Calculations

Voltage Sag Duration

t = (ΔV/V₀) × τ

Result: 120 ms

Determines VFD ride-through capability

Flashover Risk Index

FRI = (ρ × D × T)/S

Result: 7.2

Triggers proactive washing schedule

📊 Results

99.992% uptime (up from 99.81%), zero unplanned power trips in 18 months

💡 Lessons Learned

• •GIS enclosures essential in high-dust environments
• •Real-time VAR control reduced capacitor bank failures by 65%

✅ Key Takeaways

• 1GIS enclosures essential in high-dust environments
• 2Real-time VAR control reduced capacitor bank failures by 65%