... grid 3.Modular installment 4.Safe operation >20 years Electric substation structure for 220kv1.ISO9001:20082.Support smart grid3.Modular installment4 ... A-36, ASTM A-572, S355,etc.2. Our design, fabrication, galvanization and inspection test approval adopt equivalent china standard ... dimension check, wielding inspection, zinc coating inspection, prototype, etc. Electric substation structure for 220kv