Time-domain method to identify permanent fault of transmission line with shunt reactor

A reference model is established according to the states of transmission line during voltage restoration from temporary fault, based on which, the faulty phase current of local shunt reactor is calculated with local electrical variables in time-domain. With the difference between calculated and measured currents as the operating component and the measured current as the threshold, the criterion of permanent fault identification is founded. For a temporary fault, the calculated and measured currents are same because the state of transmission line accords with the established model, the operating component is smaller than the threshold. For a permanent fault, because the current calculated by the transient model is far away from the measured current, the operating component is larger than the threshold. Simulation results show that the proposed criterion identifies the permanent fault correctly, which can be applied to the adaptive reclose.