ABB RELION Series Technical Manual page 707

1MRS758755 A
REC615 and RER615
Technical Manual
Observation
3s_MN_UNB
(from Average calculator)
10MIN_MN_UNB
(from Average calculator)
BLOCK
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
Single
Periodic
Continuous
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.
Power quality measurement functions
period
Statistics
Percentile
calculator
recorder
Observation time
Only one period of observation time is activated.
The time gap between the two trigger signals is
seven days.
The next period starts right after the previous
observation period is completed.
Section 10
OBS_PR_ACT
PCT_UNB_AL
701