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Statistics data (Power value group)
Table 9.3-1 shows the statistics information and its abbreviation in power value data.
Table 9.3-1 Power value data
Watt-hour (plus/minus), var-hour (plus/minus)
9.3.1 Power information on the screen
Figure 9.3-1 shows the information about the watt-hour and var-hour (Wh and varh).
Figure 9.3-1 Example of Power Value screen
Note: See Chapter
User interface: Monitoring sub-menu: Statistics sub-menu
.
9.3.2 Setting for power values
The user can select the unit for each power value. For example, set the [Wh-Display Unit]=kWh,
when kWh is perferred to display.
Table 9.3-2 Selection of units for displaying
Selection of a unit fot the displaying
Kilo-watt-hour (kWh) or Mega-watt-hour (MWh)
Kilo-var-hour (kvarh) or Mega-var-hour (Mvarh)
9.3.3 Regulation of power values
The number of digits for the power value can be reduced based on the units kWh, MWh and
kvarh+. For instance when the power is measured as "123,456kWh" then it is displayed as
"123MWh". If this value has to be changed then the user can key in a new compensated value.
For example, if "78MWh" should be displayed on the IED screen even though the measured
value is "123,456kWh" then the user can set the new value of "78MWh". Note that the
compensated value "78MWh" is "78,000kWh", and it is not "78,456kWh" or "123,456kWh"; the
compensated value will be affected when a change in the setting of VCT ratio. That is, the user
can set a value of "78MW" during the CT ratio of "2000:1", but the CT ratio would be changed
from "2000:1" to "4000:1"; hence, the value will be displayed as "156MW" on the IED screen
later. Therefore, when the CT ratio setting is required to be changed, remember to set the value
of "78MW" again to display the compensated value.
h+ +
0.0MWh
Wh- +
0.0MWh
varh+ +
0.0Mvarh
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