The blackout was caused by a sequence of events. During this time period a scheduled maintenance shutdown was underway on one circuit of the line. Next, an alarm was received at the Electricity nation Control Centre, indicating that a transformer or its associated shunt reactor was in distress and could fail causing signigicant safety and environmental impacts. National Control contacted EDF Energy and asked them to disconnect the distribution system from the transformer, and switch.
After the switching process took place the automatic protection equipment on a circuit interpreted the switching as a fault. The automatic protection relay disconnected this circuit from the rest of the transmission system causing a loss of supply. (#1)
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