A Novel AC Solid-State Circuit Breaker with Reclosing and Rebreaking Capability

Abstract

These days, the widespread use of sensitive loads and distributed generators makes the solid-state circuit breaker (SSCB) an essential component in power circuits to achieve a high power quality for AC Grids. In traditional AC SSCB using SCRs, some auxiliary mechanical devices are required to make the reclosing operation possible before fault recovery. However, the proposed AC SSCB can break quickly and then be reclosed without auxiliary mechanical devices even during the short-circuit fault. Moreover, its fault current breaking time is short and its SSCB reclosing operation is fast. This results in a reduction of the economic losses due to fault currents and power outages. Through simulations and experiments on short-circuit faults, the performance characteristics of the proposed AC SSCB are verified. A design guideline is also suggested to apply the proposed AC SSCB to various AC grids.

Smart Grid Performance Improvement with AC Solid-State Circuit Breaker having Charging and Rebreaking Capabilities

“…In particular, reconnection and reactivation operations are almost impossible due to continual short circuits on the load side that prevent the commutating capacitors from being charged. Previous AC SSCBs were presented in [15], [16]. When the main SCRS is turned on, the previous AC SSCB's circuit charges the commutation capacitors.…”

“…In the case of a three-phase supply in a grounded neutral system, the preceding AC SSCB needs the usage of a complicated thyristor to charge the commutation capacitors. At the same time, a single line fault happens to the ground [16]. The study introduces a novel AC SSCB with quick re-closing and rebreaking capabilities to overcome the drawbacks above, giving it the ability to perform operational tasks like resealing and rebreaking operations.…”

Application of Multiscale Entropy in Mechanical Fault Diagnosis of High Voltage Circuit Breaker

“…For example, the state of the circuit breaker, such as loose screws and iron core jamming, can be found by analyzing these signals [ 3 , 4 , 5 ]. Therefore, fault diagnosis of a circuit breaker has become a major research topic [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Runde et al [ 15 ] used acoustic signals to assess the condition of circuit breakers first.…”