8-20
Breaker Monitor and Metering Functions
Date Code 20011205
SEL-311A Instruction Manual
Comparison of Thermal and Rolling Demand Meters
The example in Figure 8.11 shows the response of thermal and rolling demand meters to a step
current input. The current input is at a magnitude of zero and then suddenly goes to an
instantaneous level of 1.0 per unit (a “step”).
Figure 8.11: Response of Thermal and Rolling Demand Meters to a Step Input (setting
DMTC = 15 minutes)
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