Ground ground fault data collecton begins every hour at about five minutes past the hour; each collection consists of about ten attempts spaced about one minute apart. Each attempt constitutes one record. Each record contains 71 data. The data is (more or less) evenly spaced over 0.003 seconds. The buffer is about 453 records deep, or almost two days. Once collected, the data goes through a simple processor that lines up the peaks.
Here is the data used to generate the plot. The first plot is autoscaled and shaded. In the second plot, anything that is shaded green to blue is an acceptable value. Outside that range indicates trouble, which is indicated by quickly switching to red.