Voltage unbalance detector
The three-second average value is calculated and compared to the set value
Unbalance
pickup val
. If the voltage unbalance exceeds this limit, the
MN_UNB_AL
output is
activated.
The activation of the
BLOCK
input blocks
MN_UNB_AL
output.
Percentile calculation
The Percentile calculation module performs the statistics calculation for the level of
voltage unbalance value for a settable duration. The operation of the Percentile calculation
module can be described with a module diagram.
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 542:
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.
Section 10
1MAC059074-MB A
Power quality measurement functions
1064
615 series ANSI
Technical Manual
Содержание Relion 615 series
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