(1) When installing lightning rod, the outdoor power distribution device should be equipped with lightning rod to protect against direct lightning stroke. If the substation is located in a nearby high building with lightning protection facilities and within the protection scope or the substation itself is indoor type, the protection of direct lightning can not be considered.<br>(2) Lightning arrester is installed on the high voltage side, which is mainly used to protect the main transformer. This is mainly because it is used to protect the main power transformer from the electromagnetic shock wave generated by the lightning of connecting the high voltage side power supply equipment along the line of connecting the high voltage side power supply equipment, The most critical power supply equipment (3) connected to the power supply at the high voltage side is damaged. The arrester installed at the low voltage side of the transformer mainly limits the possible over-voltage on the winding at the low voltage side of the transformer, thus protecting the high voltage of the transformer<br>Side winding. In addition, when the low-voltage side of the power transformer and the neutral point are not completely grounded, for example, it system, in which a valve type arrester or a protective gap made of metal oxide can be used between the neutral points.<br>
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