ECE 526 HW #6 (rev . 2/24/05)

The data for an EMTP circuit shown in Figure 1 that simulates C phase ground fault at node N6 is provided in the file HW6.xls. The node association for the columns of data is provide in the first row of the data set with the first column being the sample time. The data has been sampled at 960 Hz. Show that the negative and zero sequence polarization properly identifies the direction of the fault for relays on Line #2 at bus S and R.

Positive sequence line angle for the protected section N8 to N9 is 88,2 degrees

Zero sequence line angle for the protected section N8 to N9 is 86.9 degrees

Figure 1. Simulated power system