CIGRE 445 Guide for Transformer Maintenance (Partial Document) Posted on August 16, 2019August 17, 2019 by Eltrasolution Version 117 Download 385 KB File Size August 16, 2019 Create Date Download Overview of CIGRE 445 Guide for Transformer Maintenance. For full document, please directly download from CIGRE website. You need to create account there. by Eltrasolution Vaisala – The Effect of Moisture on the Breakdown Voltage of Transformer Oil