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A fast overcurrent protection scheme was developed for GaN gate injection transistors (GITs), harnessing the relationship between the externally measured vgs and id in steady-state operation. This relationship has been characterized in both static and dynamic testing over a wide range of operating conditions, and a circuit has been constructed to implement this control scheme. The circuit uses analog...
Voltage Source Converters (VSC) are becoming more common in modern High Voltage DC (HVDC) transmission systems. One of the major challenges in a multi-terminal VSC-HVDC is protection against DC side faults. Two major designs, namely, the hybrid DC breaker and the assembly HVDC breaker, are compared for operational behavior, speed of operation and current carrying capability. The Dual Modular Redundancy...
High proliferation of Inverter Interfaced Distributed Energy Resources (IIDERs) into the electric distribution grid results in failure of the traditional overcurrent based fault detection at the point of interconnection (POI) of IIDERs. This paper focuses on other strategies of detection, namely, 1) using the transient content at the inverter output, 2) using zero sequence current magnitude at the...
The increasingly presence of HVSC connection onboard ships opens the path for innovative applications, such as ship-to-shore connection. Indeed, it is possible to supply power to land during emergency (mainly to deployed camps/bases), thanks to the electric power generation capabilities of modern all electric ships. However, the use of the same system to provide both the HVSC and ship-to-shore connection...
Electrical power supply interruption due to some temporary faults has been a common problem in residential buildings. This leads to discontinuity of electrical supply to the building. However, power supply continuity is very important, as some of the appliances such as refrigerator, security, aquarium and fire alarm system requires continuous supply to be activated. Generally, when a fault occurs...
NSTX at Princeton Plasma Physics Laboratory (PPPL) requires sophisticated plasma positioning control system for stable plasma operation. TF magnetic coils and PF magnetic coils provide electromagnetic fields to position and shape the plasma vertically and horizontally respectively. NSTX utilizes twenty six coil power supplies to establish and initiate electromagnetic fields through the coil system...
In recent years protection of electrical systems has developed considerably with the advent of programmable electronic protection devices which provide the scope for much closer protection and monitoring of electrical equipment. However, is this sophisticated equipment being used correctly to provide the protection required and are our systems as well protected as they should be? The protection is...
Overcurrents on distribution systems include permanent faults, temporary faults and other lower magnitude surges, typically from switching events. The overcurrent environment of the distribution system requires quantification if improvements are to be made in power quality, protection and reliability. New and more complex overcurrent protection products require more exact knowledge of feeder conditions...
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