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Run your signal through a notch filter at 50 Hz. Then any other energy that gets through is from the transient. (You may need to put several stages of the filter in tandem to get rid of all of the 50 Hz.) Detect the filter output with a window comparator set to not trigger on the remaining 50 Hz signal that leaks through.
You can simulate wavelet results using the WaveLab802 pack for M@tL@b 5.x, this is a free pack, that you can download from https://www-stat.stanford.edu/~wavelab/
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