Substation Insulation Coordination BIL Calculator
Determine required equipment Basic Lightning Impulse Insulation Level (BIL), surge arrester protection margins, altitude derating, and phase-to-earth air clearances per IEC 60071.
System Voltage & Environmental Site
Standard IEC: 72.5, 145, 245, 420 kV
IEC derating applies above 1,000 m
Peak at 10 kA (8/20 μs) impulse
IEC / IEEE standard: ≥ 20%
Insulation Coordination & Clearances
Protection Margin (PM)
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Altitude Derated BIL Req.
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Phase-to-Earth Air
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Phase-to-Phase Air
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Safety Clearance
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Insulation Coordination Diagnosis
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Recommended Tools & Equipment
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