Effects of Series Reactor on Short-circuit Current and Transient Recovery Voltage

With the increasing of short-circuit current of the power grid, by use of series reactor to limit 500 kV short-circuit current is feasible, but the introduction of series reactor could change the transient recovery voltage and have effect on the circuit breakers interrupting performance. In this paper, 500 kV reactor is used to limit short-circuit current of Dongqing substation, the current changes of different reactor values under three-phase short-circuit fault are analyzed, the best-value work interval is obtained; at the same time, the problem of TRV is solved by the mean of introduction parallel capacitance, it can reduce the amplitude and rate of TRV. The results showed that: the way of using parallel capacitors to reduce amplitude and rate of TRV is feasible, if reduce the amplitude of the TRV substantially, larger capacitors are required.