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made by the following rules:
(i) Maximum and minimum value
For example, the demand feature gets to have both a minus (e.g., –100 watt) and a plus (e.g.,
+50 watt) values, ‘–100 watt’ is taken to the minimum data and ‘+50 watt’ is taken to the
maximum data. Note that given values do not come out as absolute values.
(ii) Averaged value
If the demand feature gets a data (e.g. +100 watt) in the first period and the other data (that
is, –100 watt) in the later period, the data is taken into the absolute value calculation (that is,
|–100W|+|100W|=200W; 200W/2=100W).
9.4.3 Demand cycle
The data is taken into the memory every second; the demand feature will calculate the
Max/Min/Ave values by the function by collecting the latest data in the memory. When setting
15 minutes for the [Demand_period], for example, the calculation is done using the data during
the latest 15 minutes. The user can have the cycle of the demand feature be selected among
1min, 5min, 10min, 15min, 30min, and 60min.
Figure 9.4-2 Demand cycle setting in the setting screen
9.4.4 Resetting data in demand features
The data will be cleared by the following cases:
(a) To energize the IED or to make the initialization about the IED functions
(b) To set a value for the setting [Demand_period]
(c) To operate “Reset All Values” on the IED menu
Figure 9.4-3 Reset menu for Demand values
Metering
10:48 21/23
PhaseSD +
0.50 deg
PeriodSD +
0
Demand Value
10:48 1/2
Demand Value >
Reset All Values +
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