ABB REC 561, User Manual

Page: 588 / 643

ABB Network Partner AB
- 69 Page
Function:
1 Application
The aim of disturbance recording is to provide a means for better under-
standing of the behaviour of the power network and related primary and
secondary equipment during and after a disturbance. An analysis of the
recorded data provides valuable information that can be used to improve
existing equipment. This information can also be used when planning for
and designing new installations.
Most of the built-in disturbance recorders offered by various manufactur-
ers operate only in connection with the operation of the protective func-
tions, and they have a very limited capacity for recording times and the
number of recordings.
This is not the case with the disturbance recorders built into the REx 5xx
terminals. These disturbance recorders are characterised by great flexibil-
ity as far as starting conditions and recording times, and large storage
capacity are concerned. Thus, the disturbance recorders are not dependent
on the operation of protective functions, and they can record disturbances
that were not discovered by protective functions for one reason or another.
The disturbance recording function in the REx 5xx terminals is fully ade-
quate for the recording of disturbances for the protected object.
1.1 Recording capacity
The recording function can record all analogue inputs in the transformer
module and up to 48 binary signals. To maximise the use of the memory,
the number of analogue channels to be recorded is user-selectable by pro-
gramming and can be set individually for each analogue input. The
recorded binary signals can be either true binary input signals or internal
logical signals created by the protective functions.
1.2 Memory capacity
The maximum number of recordings stored in the memory is 10. So
depending on the set recording times and the recording of the enabled
number of channels, the memory can contain a minimum of six and a
maximum of 10 disturbance recordings comprising of both header part
and data part. But the header part for the last 10 recordings is always
available.
1.3 Recording times
The recording times for the pre- and post-fault period, tPre and tPost, are
user-programmable with wide-setting ranges.
To avoid uncontrolled recording and subsequent erasing of previous
recordings, in case a trigger should not reset within a reasonable time, a
limit time tLim can be set to limit the total duration of a recording.
1.4 Triggers
Any of the recorded binary signals can be programmed to act as a trigger.
The analogue channels have programmable threshold levels for trigger-
ing. Both overlevels and underlevels are available. Manual triggering is
also available. This provides a convenient test possibility.
7
Disturbance recorder 1MRK 580 141-XEN
Version 1.0-00
October 1996
Optional