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Primary open-phase faults on station auxiliary transformers(SATs) are characterized by the presence of voltage unbalance at the auxiliary equipment level that could lead to protective device tripping, increased motor acceleration times, overheating or failure to start critical safety loads, particularly in the nuclear power industry. The transformer primary to ground zero sequence impedance has a...
Multiple events across the nuclear power industry have highlighted the need for greater understanding of what happens during an open phase fault. These open phase events have occurred on the high side of offsite power supply transformers and have involved loss of one or two phases. This paper explores a method to characterize the downstream system response to an open phase fault using steady-state...
This paper proposes a new method to train a regression tree for disturbance classification based on long term records considering the most probable operational conditions obtained by historical data of the analyzed system. Unlike the usual, deterministic approach of simulating a set of predetermined conditions varying fault resistance and position, the decision making process is now supported by a...
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