Schweitzer Engineering Laboratories SEL-311C - Figure 3.13 Ground and Phase Distance Speed Curves-Standard Output

3.17
Date Code 20060320 Instruction Manual SEL-311C Relay
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Distance Element Operating Time Curves at Nominal Frequency
Figure 3.13 Ground and Phase Distance Speed Curves—Standard Output
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
Fault Location in Percent of Set Reach
Operating Time in Cycles
SEL-311C Quadrilateral Ground Operating Times
Single-Line-to-Ground Faults
SIR = 0.1
SIR = 1.0
SIR = 10.0
SIR = 30.0
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
Fault Location in Percent of Set Reach
Operating Time in Cycles
SEL-311C Mho Ground Operating Times
Single-Line-to-Ground Faults
SIR = 0.1
SIR = 1.0
SIR = 10.0
SIR = 30.0
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
Fault Location in Percent of Set Reach
Trip Time in Cycles
SEL-311C Phase Mho Operating Times
Phase-to-Phase Faults
SIR = 0.1
SIR = 1.0
SIR = 10.0
SIR = 30.0