(1) Firstly, it is necessary to consider the possibility that the shutdown of this voltage transformer may cause malfunctions in related protections (such as distance protection) and automatic devices (such as auto-transfer). Therefore, it is essential to apply for the deactivation of these protections and automatic devices.
(2) To de-energize the voltage transformer, the high-voltage side switch, the secondary air switch or fuse should be disconnected to prevent reverse charging of the secondary side.