8-24 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006
SEL-351 Instruction Manual
Time = 10 Minutes
The three 5-minute intervals in the sliding time-window at “Time = 10 minutes” each integrate into
the following 5-minute totals:
5-Minute Totals
Corresponding
5-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
Rolling demand meter response at “Time = 10 minutes” = 2.0/3 = 0.67 per unit
Time = 15 Minutes
The three 5-minute intervals in the sliding time-window at “Time = 15 minutes” each integrate into
the following 5-minute totals:
5-Minute Totals
Corresponding
5-Minute Interval
1.0 per unit 0 to 5 minutes
1.0 per unit 5 to 10 minutes
1.0 per unit 10 to 15 minutes
3.0 per unit
Rolling demand meter response at “Time = 15 minutes” = 3.0/3 = 1.0 per unit
Demand Meter Settings
Table 8.3: Demand Meter Settings and Settings Range
Setting Definition Range
EDEM Demand meter type THM = thermal
ROL = rolling
DMTC Demand meter time constant 5, 10, 15, 30, or 60 minutes
PDEMP Phase demand current pickup OFF
NDEMP Neutral ground demand current pickup 0.50 - 16.00 A {5 A nominal}
GDEMP Residual ground demand current pickup 0.10 - 3.20 A {1 A nominal}
QDEMP Negative-sequence demand current pickup 0.005 - 0.160A {0.05 A nominal
channel IN current input}
Note: Changing setting EDEM or DMTC resets the demand meter values to zero. This also
applies to changing the active setting group, and setting EDEM or DMTC is different in
Courtesy of NationalSwitchgear.com
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