ABB RELION Series, Техническое руководство

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Observation
period
Statistics
recorder
Percentile
calculator
PCT_UNB_AL
OBS_PR_ACT
BLOCK
10MIN_MN_UNB
(from Average calculator)
3s_MN_UNB
(from Average calculator)
GUID-0190AF77-2DCC-4015-8142-EA6FE5FA2228 V2 EN
Figure 373: Percentile calculation
Observation period
The Observation period module calculates the length of the observation time for the
Statistics recorder sub-module as well as determines the possible start of a new one. A
new period can be started by timed activation using calendar time settings
Obs period
Str year , Obs period Str month , Obs period Str day and Obs period Str hour .
The observation period start time settings Obs period Str year , Obs
period Str month , Obs period Str day and Obs period Str hour are used
to set the calendar time in UTC. These settings have to be adjusted
according to the local time and local daylight saving time.
A preferable way of continuous statistics recordings can be selected over a longer
period (months, years). With the
Trigger mode setting, the way the next possible
observation time is activated after the former one has finished can be selected.
Table 700: Trigger mode observation times
Trigger mode Observation time
Single Only one period of observation time is activated.
Periodic The time gap between the two trigger signals is
seven days.
Continuous The next period starts right after the previous
observation period is completed.
The length of the period is determined by the settings Obs period selection and User
Def Obs period . The
OBS_PR_ACT
output is an indication signal which exhibits
rising edge (TRUE) when the observation period starts and falling edge (FALSE)
when the observation period ends.
If the Percentile unbalance , Trigger mode or Obs period duration settings change
when
OBS_PR_ACT
is active,
OBS_PR_ACT
deactivates immediately.
1MRS758755 A
Section 10
Power quality measurement functions
REC615 and RER615 701
Technical Manual