Recorded data information
When voltage variation starts, the phase current magnitudes preceding the activation
moment are stored. Also, the initial voltage magnitudes are temporarily stored at the
variation pickup moment. If the variation is, for example, a two-phase voltage dip, the
voltage magnitude of the non-active phase is stored from this same moment, as shown in
. The function tracks each variation-active voltage phase, and the minimum or
maximum magnitude corresponding to swell or dip/interruption during variation is
temporarily stored. If the minimum or maximum is found in tracking and a new magnitude
is stored, also the inactive phase voltages are stored at the same moment, that is, the
inactive phases are not magnitude-tracked. The time instant (time stamp) at which the
minimum or maximum magnitude is measured is also temporarily stored for each voltage
phase where variation is active. Finally, variation detection triggers the recorded data
update when the variation activation ends and the maximum duration time is not
exceeded.
The data objects to be recorded for PQSS are given in
. There are totally three
data banks, and the information given in the table refers to one data bank content.
The three sets of recorded data available are saved in data banks 1-3. The data bank 1 holds
always the most recent recorded data, and the older data sets are moved to the next banks
(1→2 and 2→3) when a valid voltage variation is detected. When all three banks have data
and a new variation is detected, the newest data are placed into bank 1 and the data in bank
3 are overwritten by the data from bank 2.
shows a valid recorded voltage interruption and two dips for the
Phase mode
value "Single Phase". The first dip event duration is based on the
V_A
duration, while the
second dip is based on the time difference between the dip stop and start times. The first
detected event is an interruption based on the
V_B
. It is
shown also with dotted arrows how voltage time stamps are taken before the final time
stamp for recording, which is shown as a solid arrow. Here, the
V_B
timestamp is not
taken when the
V_A
activation starts.
Section 10
1MAC059074-MB A
Power quality measurement functions
1052
615 series ANSI
Technical Manual
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