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Help for IEEE 998

Help for IEEE 998

Help for IEEE 998

(OP)
1. Whick guide recommend Cone Method for lightning protection ?as we know ieee 998 recmmend Rolling Sphere Method.

2. When calculating Zs, Does the parameter R0 namely the equivalent radius of the bundle refer to the metallic

radius of the bundle ? Is this right that R0=18.88mm/2=9.44mm for ACSR-185/30 ?

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