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Several cases of unusual mal-operation of the current differential protection for transformer, generator and transmission line already in service, due to the adjacent transformer switching-on, have been reported. The complex inrush current, including the magnetizing inrush current and the sympathetic inrush current, is considered to be relevant with this sort of mal-operation. However, the detail...
Loaded switches are frequent for the running electric locomotive. The frequencies, phases and amplitudes between the system voltage and residual voltage may be different when the transformer is put into use. The transient responses at different time points are thus analyzed to determine the optimal time to switch on the locomotive transformer and prevent the damage to the system.
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