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Currently, under-voltage trip devices are widely installed in circuit breakers of low-voltage distribution networks and end users' sides. These protection devices can prevent equipments from damage when voltage sag or power supply interruption occurs. Although relay protection devices can act correctly and clear the fault as soon as possible when a ground or inter phase fault occurs in the nearby...
Data mining technique can extract desired knowledge from existing databases and ease knowledge acquisition bottleneck of fault diagnosis. A new knowledge acquisition method combined of decision tree and rough set theory is thus proposed for fault diagnosis in this paper. Based on the reduction by rough set theory, decision tree extract diagnostic knowledge from the reduced decision tables in the form...
This paper proposes an electromagnetic transient model of the voltage source converter (VSC) based HVDC transmission converter station multi-legged transformer. Currently, three phase multi-legged converter transformers are often used in VSC-HVDC schemes. However, VSC-HVDC converter transformers are normally represented as magnetically and electrically independent single phase units when simulating...
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