19
Date Code 20200326
SEL Application Guide 2020-04
Use
to determine the total communication delay for 32.20000 km.
Equation 2
Remote Zone 3 Distance Protection Maximum Operating Time
This example uses the SEL-311C-0 as the remote relay. Refer to the SEL-311C-0 instruction man-
ual and [7] for more information about the Zone 3 distance protection maximum operating times.
and
show the operating curves for the SEL-311C-0. If you use any relay other
than the SEL-311C-0, refer to the respective instruction manual for the operating curves.
Distance
32.20000 km
=
Delay Communications
32.20000 km 5.00000
s/km
0.00016 s
=
•
=
Delay
60.00000 0.00016 s
0.01000 cycles
=
•
=
Figure 17
Operating Time Curve of the SEL-311C-0 for a Phase-to-Phase Fault
SIR = 0.1
SIR = 1.0
SIR = 10.0
SIR = 30.0
0
10
20
90
30
40
50
60
70
80
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
Fault Location in Percent of Set Reach
Trip Time in C
ycles
