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REU 513
2.1.6.
36
User's Guide
Recorded data
When one of the overvoltage stages starts, recording of the highest measured voltage
value as well as the start duration, measured as a percentage of the set operate time,
begins. If the started protection stage resets before the operate time has elapsed, the
highest voltage value captured during the starting and the start duration are stored in
the event register at the moment of reset.
On the other hand, if either of the overvoltage stages trips, both the values at the
moment of tripping and the values captured during the starting are memorized.
The same principle applies to the undervoltage stages: if a stage only starts, the
lowest voltage value as well as the lowest calculated positive-phase-sequence value
and the start duration are stored in the event register. In case the starting is followed
by a trip, the values at the moment of tripping as well as the values captured during
the starting are memorized.
The event register takes the latest five events. The recording of a new sequence is
only possible after all the stages that caused the previous event have reset.
How many times (range: 0...255) a protection function has started can be read via
the parameters V5...V8.
Table 13: Recorded data
REGISTER
Recorded data
EVENT1
The highest voltage value measured during the start sequence of an
overvoltage stage as a multiple of the rated voltage U
voltage value measured during the start sequence of an undervoltage
stage as a multiple of the rated voltage U
moment of tripping. The lowest value of the positive-phase-sequence
voltage at start of stage U< or U<<. Duration of the latest start situation of
stages t>, t>>, t< or t<< expressed as a percentage of the set operate
time or, at IDMT mode of operation, of the calculated operate time. Time
stamp for the event; date and time.
The previous recorded values are pushed forward one step in the event
register while the oldest values are lost. The last five recorded events are
memorized so that the most recent values are stored in register EVENT 1
and the other four recorded values in registers EVENT 2...EVENT 5.
When one of the stages operates, the duration reading (t>, t>>, t< or t<<)
for the stage is 100%.
EVENT 2
The operation principle is the same as that of EVENT 1.
EVENT 3
The operation principle is the same as that of EVENT 1.
EVENT 4
The operation principle is the same as that of EVENT 1.
EVENT 5
The operation principle is the same as that of EVENT 1.
ABB Substation Automation
Products and Systems
. The lowest
n
. The voltage measured at the
n
1MRS750886-MUM
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