Schweitzer Engineering Laboratories SEL-311C - Distance Element Operating Time Curves at Nominal Frequency

3.16
SEL-311C Relay Instruction Manual Date Code 20060320
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Distance Element Operating Time Curves at Nominal Frequency
Distance Element
Operating Time Curves at Nominal Frequency
Figure 3.13 and Figure 3.14 show operating times for the SEL-311C distance
elements. The diagrams show operating times at each test point. Operating
times include output contact closure time.
For the distance element test, a fault was applied at a location representing a
percentage of the Zone 1 relay reach setting. Tests were performed for source
impedance ratios (SIR) of 0.1, 1.0, 10.0, and 30.0. No pre-fault load current or
fault resistance was included. Operating times are the same for both 50 Hz and
60 Hz.