ERL L-PRO 4000, User Manual

Page: 103 / 406

4 Protection Functions and Specifications
D02706R02.30 L-PRO 4000 User Manual 4-53
Record
Duration and
Extension
The length of each record is determined by the Record Length setting. Tran-
sient record lengths can be set between 0.2 and 10.0 seconds; swing record
lengths can be set between 60 and 120 seconds. Pre-trigger times are configu-
rable between 0.10 to 2.00 seconds for transient records and fixed at 30 sec-
onds for swing records and are included as part of the normal record length.
The relay automatically extends a record as required to capture consecutive
triggers that are close together. If a trigger occurs while a recording is in prog-
ress, the record is extended to include the full post-trigger time of subsequent
triggers, up to a maximum length —12.0 seconds for transient 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 length settings are accessible under the Record Length
heading of the relay settings, and can be set with the Offliner Settings software.
Record Storage
The relay compresses records on the fly, achieving a typical lossless compres-
sion rate of 4:1. As a result, the relay can store up to 75 x 2 second transient
records, or up to 75 x 120 seconds swing records, or a combination of 75 tran-
sient, swing and optionally event records. If the storage is full, new records au-
tomatically overwrite the oldest, ensuring that the recording function is always
available.
Record
Retrieval and
Deletion
A listing of stored records is available through the Relay Control Panel under
the
Records > List menu. The listing transfers records to a connected PC and
deletes them from storage.