Because these are proprietary and highly specific grid engineering assets, they are rarely found on mainstream software sites. You will typically find them in two places:
PYLONE 225KV 1T1P * [Link] 1T1PL TELECHARGER. [Link] 1T1PN TELECHARGER. [Link] 1T1PT TELECHARGER. [Link] 1T1PA TELECHARGER. [Link] Pylone 225 kV Specifications and Details | PDF - Scribd
Once you have located and downloaded the .rar file, you need to safely extract and audit the contents: