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SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Other Settings
(15/5 = 3). The rolling demand meter response is updated every five minutes,
after a new five-minute total is calculated.
The following is a step-by-step calculation of the rolling demand response
example in Figure 4.122 (bottom).
Time = 0 Minutes
Presume that the instantaneous current has been at zero for quite some time
before “Time = 0 minutes” (or the demand meters were reset). The three
five-minute intervals in the sliding time-window at “Time = 0 minutes” each
integrate into the following five-minute totals.
Rolling demand meter response at “Time = 0 minutes” = 0.0/3 = 0.0 per unit.
Time = 5 Minutes
The three five-minute intervals in the sliding time-window at “Time = 5
minutes” each integrate into the following five-minute totals.
Rolling demand meter response at “Time = 5 minutes” = 1.0/3 = 0.33 per unit.
Time = 10 Minutes
The three five-minute intervals in the sliding time-window at “Time = 10
minutes” each integrate into the following five-minute totals.
Rolling demand meter response at “Time = 10 minutes” = 2.0/3 = 0.67 per
unit.
Five-Minute Totals
Corresponding Five-Minute Interval
0.0 per unit
–15 to –10 minutes
0.0 per unit
–10 to –5 minutes
0.0 per unit
–5 to 0 minutes
0.0 per unit
Five-Minute Totals
Corresponding Five-Minute Interval
0.0 per unit
–10 to –5 minutes
0.0 per unit
–5 to 0 minutes
1.0 per unit
0 to 5 minutes
1.0 per unit
Five-Minute Totals
Corresponding Five-Minute Interval
0.0 per unit
–5 to 0 minutes
1.0 per unit
0 to 5 minutes
1.0 per unit
5 to 10 minutes
2.0 per unit
Summary of Contents for SEL-700G Series
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