Chapter 6. Description of Operation of Protection Subsystem
6-35
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
Start Time (Pre-Fault Time)
Pre-Fault is the storage time before the activation of the Start Function.
Oscillographic Record Length
It’s defined as the duration time of the store window at the
Fixed Time
mode.
Number of Records
The Number of Records stored in memory varies and depends on the number of channels
recorded and on the length of the fault records.
Once the recording memory is full, the
Overwrite
setting determines whether or not the next
event that occurs is stored over the oldest stored record (s). If the
Overwrite
setting has been
set to
YES
and as the new records vary in length, old records will get cancelled depending on
the space required by the new record.
Record Storage Modes
Start Mode:
Recorded data is stored whenever the Start Function is activated. For Fixed Time
Mode [Fixed Time (
YES
)] recorded data is stored for a time determined by the Record Length
Setting. For Variable Time Mode [Fixed Time (
NO
)] recorded data is stored while the Start
Function is activated.
Trip Mode 1:
Recorded data is stored in memory only if a trip occurs. For Fixed Time Mode
[Fixed Time (
YES
)] recorded data is stored in memory only if a trip occurs within the time set for
the Record Length. If a trip occurs after this time has expired, no record is stored. For Variable
Time Mode [Fixed Time (
NO
)] recorded data whenever the Start Function is active in addition to
the pre-fault data.
Trip Mode 2:
For Fixed Time Mode [Fixed Time (
YES
)] recorded data is stored in memory only
if a trip occurs within the time set for the Record Length. If no trip occurs within the time set for
the Record Length, only 4 cycles of recorded data will be stored after the Start Function is
activated.
For Variable Time Mode [Fixed Time (
NO
)] if no trip occurs while the Start Function remains
active, only 4 cycles of recorded data will be stored after the Start Function is activated. If a trip
occurs while the Start Function is active, recorded data will be stored during the whole time the
Start Function remains active in addition to the pre-fault data.
Note: For the elements in which reset time can be long, it is recommended to set Fixed Time on YES.
It is reminded that information recorded during the time set as
Pre-Fault Time
is always stored.
Overwrite
If the
Overwrite
setting has been set to
NO
, no more records will be stored once the
oscillography memory is full. In that situation, set
Overwrite
on
YES
so that new records can
get stored.
If the
Overwrite
setting has been set to
YES
, once the memory is full, the next record will
replace the oldest record that is erased.
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Страница 175: ...D List of Illustrations and Tables...