ERL 8700/BUS, Руководство пользователя

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4 Protection Functions
4-22 B-PRO User Manual 8700 D01908R02.12
Record Duration
and Extension
The length of each record is determined by the Record Length setting. Fault
record lengths can be set between 0.2 and 2.0 seconds; swing record lengths
can be set between 30 and 120 seconds. Pre-trigger times are fixed at 10 cycles
for fault records and 30 seconds for swing records and are included as part of
the normal record length.
The B-PRO automatically extends a record as required to capture consecutive
triggers that are close together. If a trigger occurs while a recording is in
progress, the record is stretched to include the full post-trigger time of subse-
quent triggers, up to a maximum length—2.0 seconds for fault records; 180
seconds for swing records. If a trigger occurs before the end of a record caused
by a previous trigger, but too late to allow sufficient post-trigger time in a max-
imum extended record, a new overlapping record is created.
The normal record lengths settings are accessible under the
Recording heading
of the relay settings, and can be set from either the terminal user interface or
the
Offliner Settings software.
Record Storage The B-PRO compresses records on the fly, achieving a typical lossless com-
pression rate of 4:1. As a result, the B-PRO can store up to 30 seconds of fault
recordings and up to 24 minutes of swing recordings in non-volatile storage. If
the storage is full, new records automatically overwrite the oldest, ensuring
that the recording function is always available.
Record Retrieval
and Deletion
A listing of stored records is available through the terminal user interface under
the
Records>List menu. The listing transfers records to a connected PC and de-
letes them from storage.
Example:
BPRO-8700-010306-04-2002-05-15 13.17.16.000(Fault)
Records are named by combining the Unit ID setting with the date and time of
the initiating record trigger. The record list shows the record type (fault).
To delete a record from storage, use the up/down cursor keys to select the
record, then select
<D> . You can also do group deleting and group transfer-
ring.
To select multiple records:
1 Select a record.
2 Press the space bar, a asterisk appears to the left of the record to indicate it
is selected.
3 Continue selecting and pressing the space bar until all desired records are
selected.
4 Select <D> . A message asks “Delete all selected files?”. Select Y for Yes
and the files are deleted.
To transfer a record to your PC, use the up/down cursor keys to select the
record, then select
r . The record is automatically transferred to your PC using
A swing record can take a couple of minutes to produce due to the
long post-trigger time.
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