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Ajouter au panierpaperback. Etat : New. Paperback. Pub Date: 2012 03 of Pages: 44 Language: Chinese in Publisher: China Planning Press 35kV-220kV unattended substation design technical regulations (DLT 5103-2012) for the related engineering design. construction units and associated works staff. The standards approved by the National Energy Board Notice No. 1 of 2012 issued since March 1. 2012. The original 35kV to 220kV unattended substation design technical regulations DLT 5103-1999 abolished at the same time. This standard applie.