With the increasing installations of solar energy, electric vehicles, and other dc-nature power devices in modern systems, short-circuit protection high-power dc circuits is critical HVDC transmission MVDC distribution networks. As a promising protective device, Z-source Circuit Breaker (ZCB) has some unique good features over approaches. But, under circumstance slow-developing faults, ZCB migh...

SF6, which is currently widely used in gas-insulated power transmission equipment, a greenhouse gas with very strong effect. Therefore, developing environmentally friendly insulation equipment to gradually reduce the use of SF6 has become hot research topic. As most potential alternative gas, C4F7N great significance study electrical characteristics medium-voltage switching field promote green ...

This paper proposes the use of hypothesis testing for topology error identification based on normalized Lagrange multipliers. The main objective is to avoid state re-estimations that would be otherwise required for each possible set of suspect breaker statuses. The hypotheses are defined in terms of the set of circuit breakers whose statuses are under suspicion. The proposed hypothesis testing ...

A new DC fault current limiter (FCL)-based circuit breaker (CB) for microgrid (MG) clusters is proposed in this paper. The analytical expressions of the a bidirectional interlink DC/DC converter interconnection line two nearby MGs are analyzed detail. Meanwhile, clearing solution (based on using FCL series with breaker) proposed. This structure offers low complexity, cost, and power losses. To ...

In this paper we develop monitoring schemes that are able to detect and identify failures in power transmission lines by analyzing binary status information from relays and circuit breakers. The approach, which is based on Petri net models, requires very simple calculations (linear checks) during execution time and allows for concurrent/incremental processing of the information as it arrives at...

High Voltage Direct Current (HVDC) circuit breakers have to suppress high values of currents at high voltages in absence of current-zero points. This makes the arc interruption more severe than the case of conventional AC networks. For circuit breaking in HVDC networks, a capacitor-inductor set has been inserted in parallel with the circuit breaker to inject reverse current to the interruption ...

VAR support should be supplied as close to the load as possible to minimize transmission losses. For voltage control and for improvement of total power factor in a distribution system the circuit- breaker switched capacitor banks can be used. The problems with this solution are the voltage steps caused by the large sizes of the capacitor banks as well as the transients caused on insertion. Thyr...