| Abstract |
Recently introduced Bi-directional Z-Source breakers [1] are capable of clearing the short circuit fault within a few microseconds. In this paper, various applications and protection requirements for Bi-directional Z-Source breakers are discussed. Detailed comparison between de-rated AC breakers and Z-Source breakers is discussed. Breaker design criteria are explained with the help of simulation results for the instantaneous surge current and short-circuit protections. Many times faults in the transmission line are temporary. Very few faults are permanent in nature where the breaker has to isolate the faulty line for the maintenance. Therefore, a breaker should be able to perform an operating duty of reclosing and re-breaking. Both topologies discussed in [1] are modified to build reclosing and re-breaking capabilities and simulation results are presented. In addition, coordination of Bi-directional Z-Source breaker (Bi-ZSB) is analyzed in a ring network [6]. Control scheme for locating the fault in a network is proposed. MATLAB simulation study is carried out to verify the breaker performance for coordination in a ring network. |
