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I have performed dynamic simulation using bus fault at generator bus, as a result, the frequency rises just after the actuation of fault. I am not able to analyze the reason behind. Instead, if I would perform LLG or LG fault on the same bus, the frequency drops just after the fault. Further, I would like to know whether there is any other way by which plot using .outx file can be drawn at single y-axis rather than separate y-axis for each parameter in an individual sheet.