Replacement Of Old And Obsolete Porcelain Disc Insulators Along With Double Suspension Hardware With 220Kv 70Kn Src Insulators At Krishna River Crossings From Loc. Nos. 676 To 680 Of 220Kv Vtps-Tadikonda Dc Line, Loc. Nos. 7 To 10 Of 220Kv Vtps Podili-Narasaraopeta Dc Line, Loc. Nos. 10 To 14 Of 220Kv Vtps-Piduguralla Dc Line