A circuit breaker is widely used to protect electric power system from fault currents or system errors; in particular, the opening mechanism in a circuit breaker is important to protect current overflow in the electric system. In this paper, multibody dynamic model of a circuit breaker including switch mechanism was developed including the electromagnetic actuator system. Since the opening mech...

A new multiresolution based pattern recognition approach is proposed for fault diagnosis of distribution switchgear. The wavelet transform is used to extract the key features from the vibration spectra following circuit breaker operation. These features are then used to plot a 2-D diagram or condition map. This map displays clearly the actual condition of the circuit breaker and it can also be ...

Recently, as interest in eco-friendly distributed power has increased, studies on the improvement of performance breakers such DC and reliability existing AC have been actively conducted. To improve these breakers, this paper conducted analysis characteristics a low voltage circuit breaker using an external magnetic field. In experiment, before current-zero point, cut-off time to is shortened a...

In this paper, a solid-state circuit breaker (SSCB) suitable for high-voltage DC systems is presented. A single gate driver used to drive multiple series-connected power semiconductor devices, leading compact, reliable, and cost-effective design. An accelerating capacitor in parallel with diode charge the capacitors of upper devices without an additional driving circuit. Simultaneous turn-on tu...

For the Taiwan Power Company (Taipower), the margins of coordination times between the lateral circuit breakers (LCB) of underground 4-way automatic line switches and the protection equipment of high voltage customers are often too small. This could lead to sympathy tripping by the feeder circuit breaker (FCB) of the distribution feeder and create difficulties in protection coordination between...