Sel 751A - Figure 4.41 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 Minutes)

4.78
SEL-751A Relay Instruction Manual Date Code 20100129
Protection and Logic Functions
Demand Metering
Figure 4.41 Response of Thermal and Rolling Demand Meters to a Step Input
(Setting DMTC = 15 minutes)
Thermal Demand
Meter Response
(EDEM = THM)
Thermal Demand Current (per unit)
0
0 5 10 15
0.5
0.9
1.0
Time
(Minutes)
Rolling Demand
Meter Response
(EDEM = ROL)
Rolling Demand Current (per unit)
DMTC = 15 minutes
0
0 5 10 15
.33
.67
1.0
Time
(Minutes)
Step Current
Input
Instantaneous Current (per unit)
0
0 5 10 15
0.5
1.0
Time
(Minutes)