Yes C57.146-2005 is for DGA interpretation of Silicone oil filled transformers. Other standards for DGA Interpretation are as below:
1) Mineral oil filled -C57.104-2008
2)Ester Filled -C57.155-2014
3) Silicone Oil filled-C57.146-2005
4)Oil from arc chamber of tap changer -C57.139-2015
5)During factory testing of mineral oil filled -C57.130-2015