The station transformer supplies power to the facilities in the substation , including not only the daily life, but also the DC system, AC control system, uninterruptible power supply and various communication devices in the station. Therefore, the station must be reliable and safe. According to the number of main transformers in 500kV substation, there are three main main wiring methods for 500kV substation station transformers:     1. When the main transformer of the 500kV substation is 2 or more, the working transformers of the two stations should be connected to the low voltage side of the main transformer, and a dedicated standby transformer connected from the reliable power supply outside the station should be installed, as shown in Figure 1-5. Shown. Figure 1-5 Station power wiring diagram for dual main transformer     2. When the main transformer of the 500kV substation is one, the working transformer should be connected to the low voltage side of the main transformer, and a special standby transformer connected from the reliable power source outside the station should be installed. There are special requirements (remote mountainous areas, bad weather, external power supply is not reliable), the installation may also start an automatic backup diesel generators, as shown in (1-6) of FIG.     3. The 500kV switch station is equipped with two working transformers connected by reliable power sources with different power points. It is also suitable to install an automatic starter diesel generator set.
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Figure 1-6 Station power wiring diagram for a main transformer