In view of the phenomenon of a 10 kV transformer ampere (TA) stealing electricity found in the special tackling of “Skynet” anti-stealing electricity, the mechanism of high voltage TA embedded with remote control device is analyzed. Through theoretical analysis, the calculation formula of actual measurement current is put forward, and the test and data analysis are carried out, and the causes of power theft of TA are studied. Through disassembling, the specific composition of the embedded remote control device is analyzed, and it is confirmed that the theoretical analysis is consistent with the actual situation of stealing electricity of the embedded remote control device, which shows that power theft can be realized by using the remote control device to short the secondary output of the TA. Finally, from the perspective of anti-electricity theft, the corresponding countermeasures are put forward to prevent the occurrence of such power theft.