The first partial discharge test vehicle for power transformers (total mass 16T, total length 9 meters) developed by Suzhou Huadian successfully completed two 220 kV 240MW power transformers at the 220 kV Malu Substation of the State Grid Shanghai Electric Power Company on March 9, 2012 (One is produced by ABB and the other is produced by Xidian) inductive withstand voltage and partial discharge test. The task takes 6 hours in total, which significantly improves work efficiency compared to the traditional decentralized equipment for testing.