Substation1

To plot a graph similar to Figure 2, the technique is to chunk the data into separate data series.

Data Series 1
I (A) t (s)
600 2.75
800 1.60
1200 1.01
1600 0.80
Data Series 2
I (A) t (s)
1600 0.80
1600 0.14
Data Series 3
I (A) t (s)
1600 0.14
4800 0.14
Data Series 4
I (A) t (s)
4800 0.14
4800 0.10

Time Current Curve 1
Figure 2

As I have said in the first part of this tutorial, I presume that you know how to use MS Excel. In the next part, we shall be learning about how to calculate curves for normal inverse, very inverse, extreme inverse and long time inverse.