MI 2792 PowerQ4 Plus
Theory and internal operation
112
Each alarm has attributes described in table bellow. Alarm occurs when 10-cycle
measured value on phases defined as
Phase,
cross
Threshold value
according to
defined
Trigger slope,
minimally for
Minimal duration
value.
Table 5.1: Alarm definition parameters
Quantity
Voltage
Current
Frequency
Active, reactive and apparent power
Harmonics and interharmonics
Unbalance
Flickers
Signalling
Phase
L1, L2, L3, L12, L23, L31, All, Tot
Trigger slope
< - Fall , > - Rise
Threshold value
[Number]
Minimal duration
200ms ÷ 10min
Each captured alarm is described by the following parameters:
Table 5.2: Alarm signatures
Date
Date when selected alarm has occurred
Start
Alarm start time - when first value cross threshold.
Phase
Phase on which alarm occurred
Level
Minimal or maximal value in alarm
Duration
Alarm duration.
5.1.14 Data aggregation in GENERAL RECORDING
Standard compliance: IEC 61000-4-30 Class S (Section 4.5.3)
Time aggregation period (IP) during recording is defined with parameter Interval: x min
in RECORDER menu.
A new recording interval commence after previous interval run out, at the beginning of
the next 10 cycle time interval. The data for the IP time interval are aggregated from 10-
cycle time intervals, according to the figure bellow. The aggregated interval is tagged
with the absolute time. The time tag is the time at the conclusion of the interval. There is
no gap or overlap, during recording, as illustrated on figure below.
