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Lightning Protection Substation: 138KV
IEEE 998 lightning shielding parameters for outdoor substations using the rolling sphere / electrogeometric model (EGM). Includes striking distance, rolling sphere radius, shielding mast heights, shield wire heights, and maximum horizontal separation by voltage class and BIL.
| voltage class | bil kV (kV) | max horizontal separation ft (ft) | protection angle deg (degrees) | rolling sphere radius ft (ft) | standard | striking distance ft (ft) | typical mast height above bus ft (ft) | typical shield wire height ft (ft) |
|---|---|---|---|---|---|---|---|---|
| 138KV | 650 | 75 | 45 | 120 | IEEE 998-2012 | 120 | 60 | 75 |
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