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DC fault current is contributed by various distributed energy resources in dc distribution systems. The tightly coupled dc distribution systems have relatively low line impedance values. The fault current increases fast because of the low impedance. Some converters in dc distribution systems include fault current limiting function. The controlled fault currents at different locations are very close...
DC fault current is contributed by various distributed energy resources in DC distribution systems. Most DC distribution systems have low line impedance. The fault current increases fast because of the low impedance. Some converters in DC distribution systems include Fault Current Limiting (FCL) function. The controlled fault currents at different locations are very close. Thus, it is important to...
This paper gives an overview on issues and challenges of DC shipboard distribution protection. Typical fault characteristics in DC shipboard distribution systems are determined by different sources at DC faults. Issues in protection design include fast and accurate fault current estimation, fast and selective fault location methods, and effective fault current control. One main challenge in practical...
Spectra have been recorded from a Xe discharge capillary discharge source in the extreme ultraviolet (EUV) region between 10nm and 70nm. The origin of the spectra have been analyzed, which have shown that the spectra between 10nm and 20nm come from the transitions of 4p-4d, 4d-4f and 4d-5p by Xe7+∼Xe12+, and the spectra between 20nm∼70nm mainly from the transitions of Xe6+∼Xe8+ as well. The results...
The first capillary discharge produced plasma extreme ultraviolet source has been started in China. Fundamental characteristics of DPP including current, Xe gas pressure, extreme ultraviolet energy and spectrum in extreme ultraviolet region have been studied. A high voltage power source is employed, which voltage can be changed from 20kV to 30kV, and the current is from 25kA to 45kA with a FWHM of...
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